Method of production of the granulated sodium percarbonate and the installation for the method realization

FIELD: chemical industry; production of sodium percarbonate and other chemical products.

SUBSTANCE: the invention is pertaining to the field of chemical industry and may be used in production of sodium percarbonate (SPC) and other chemical products, where the synthesis process is combined with the synthesized product granulation. The granulated sodium percarbonate is produced by the steady growing-up of the products of interaction of the stabilized water solutions of the soda and hydrogen dioxide on the inoculation particles-granules. To chokes give torrents of The streams of the stabilized water solutions of soda and hydrogen dioxide are fed into the reactors at keeping the time of their interaction from 5 up to 21 sec and concentration of the sodium carbonate and the hydrogen dioxide in the ratio of 1 : 1.45-1.57. The produced reaction mass in the form of a solution is fed into the mixers-granulators, where it is distributed along the surface of the inoculation particles of sodium percarbonate, moisten and saturate them within 12-25 seconds up to achieving the average humidity of 6-12 mass %. Then the wet granules are brought out into the drying room on the gas-distributing grate, on which there is a slotted clearance with the gas-feeding channel, formed as a semi-circled groove on the gas-distribution grate and the upper end of the inclined chute. The feeding of the heated flue-gases is exercised under the gas-distribution grate through the gas duct, in which there is an erected septum being the prolongation of the upper wall of the channel and separating up to 6 % of total volume of the fed flue-gases, which are coming in through the channel with adjustment of the speed of their passage through the slotted clearance into the drying room, where they form a gas curtain in the form of the semi-tabernacle, in which the dried granules are classified according to their flying speeds in such a manner, that granules with the diameter less than the preset dimension, for example 500 microns, are carried out by the two equivolumetric streams formed by splitter made in the form of a triangular prism, to the windows and are def into the mixers-granulators as the recycle for a following cycle of granularity, and the granules with the diameter exceeding the preset lower limit, for example - 500 microns and above, fall through the gaseous curtain and on the inclined chute through the outlet window get into the classifier for the final classification according to the high limit of the preset fractionized composition of the final product, for example 800 microns. From the intermediate part of the classifier the granules the preset fraction are delivered for storage. The production output of the granules of the preset fraction, for example, 500-800 microns, is up to 99 %, the bulk weight is 1093-1138 kg/m3, the contents of the active oxygen is - 13.94-14.1 %, stability is 55.91-56.83 %. The invention allows production of sodium percarbonate with the preset range of the composition of the granules without reduction of productivity of the installation.

EFFECT: the invention ensures production of sodium percarbonate with the preset range of the composition of the granules without reduction of productivity of the installation.

9 cl, 2 tbl, 4 dwg

 

The invention relates to the chemical industry and can be used in the production of percarbonate sodium and other chemical products, where the process of synthesis is combined with granulating synthetic product.

Percarbonate sodium (LTU) as a solid bleaching ingredient included in the composition of powder detergents, bleaching and cleaning agents. It is characterized by good solubility and rapid release of active oxygen (AO), is environmentally friendly, because the decay products do not pollute the environment.

The main consumer properties PKN such as the contents of AK, stability, solubility, bulk density and particle size are the main criteria in determining its quality.

Achievable contents AK in technical PKN possible to 14.7-15.0 wt.%, and consumer requirements to the contents of the AK in the target product - from 12.5 wt.% above .

Granulometric composition of the CRC received by various known methods, is usually malaysiensis value with preferred ranges of 100-1000 microns.

However, the consumers requirements to PKN, such as high content of AK and high stability, in connection with the tendency to expand its use in detergents and cleaning among the communities with the chemically more active and aggressive aluminosilicate components, high humidity and temperatures promote some changes in the process of obtaining PKN, such as, for example, a protective sheath for external stabilization of granules, which requires the use PKN with a range of particle size distribution in the range 300-850 μm, preferably 500-800 μm, which is required to eliminate significant delamination of the CMC, which is inevitable when different bulk weights of ingredients during storage and transportation, because the fulfilment of the above conditions is governed by the specified bulk density in the range of 950-1200 kg/m3preferably 1050-1180 kg/m3.

A method of obtaining granulated PKN, which consists in the fact that aqueous solutions of hydrogen peroxide and soda, or the product of their interaction is brought into contact with Securom in the form of granules PKN, stirred and subjected to drying, a portion of the dried granules are divided according to the size of the particles, produce granules with a particle size of 100-1000 μm as the target product, and the rest of granules used as reture directly after drying (RU # 2164215, CL 01 In 15/10, publ. 20.03.01).

It is known a device for implementing this method, contains one United system reagent supply, mixer, dryer fluidized bed with a gas grill cont the shaft type and the means for separating the particles into fractions line removal of one of the factions which is the drain line of the target product, and the mixer is in communication with the fluidized bed dryer in the zone of entry of the wet granules and in the zone of the conclusion of dry granules in the classifier (see ibid.).

According to the technical solutions to obtain the target product from the dryer is taken not more than 1/20 of all the dried granules, and from this the number of pellets once classified as a commercial product used only a particle size of from 100 to 1000 μm. Large granules are subjected to crushing and together with the particles of the fine fraction is used as reture at the stage of granulation percarbonate sodium.

Closest to the proposed invention is a method of obtaining a granulated PKN, which consists in the fact that stable aqueous solutions of hydrogen peroxide and soda, or the product of their interaction is brought into contact with Securom in the form of granules PKN, stirred and subjected to drying with simultaneous classification of particles according to the height of the dryer so that the small granules are predominantly in the upper layer of the dried granules, and large - mostly at the bottom, select the portion of the dried pellets from the lower layer separated by particle size, allocate the target product granules with a particle size of 100-1000 microns, and the rest of granules hills amaut process as rature (application RU # 2002113800, MKI7From 01 To 15/10, publ. 27.01.2004 g).

It is also known a device for implementing this method, containing connected in series with the supply system of the reactants, the reactor, screw mixer-granulator, a fluidized bed dryer with gas grill neprovalnoy type and a means for separating the particles into fractions, line removal of one of the factions which is the drain line of the target product, and the mixer is in communication with the fluidized bed dryer in the zone of entry of the wet granules and in the zone of the conclusion of dry granules in the classifier, and to ensure the classification of the granules during the drying process according to the height of the dryer housing of the dryer has a variable height cross section, which is provided by tilting at least one side wall of the casing at an angle of 10-20° the vertical (see ibid.).

In a product selected from the dryer to highlight granules marketable fractions obtained according to the above technical solutions, the fraction of 500-800 μm is not more than 45% of the commercial product fractions 100-1000 μm. To highlight the required number of saleable product fractions 500-800 μm classification is required, given the limits of the additional mass of granules partial grinding, and consequently reduced yield more than twice that leads to an additional load on the cleaning system of the furnace the gases, additional energy and material costs, as well as to the deterioration of sanitary and environmental situation, the failure of a given technological rhythm due maximize the mass of retur all the transport systems of the above described units. In addition, in the drying rectangular gas grills have a square of 2.5-25 m2and above with a minimum distance between the walls of 2.0 m and the slope of the side walls of the casing 10-20° the vertical will be classified not more than 5-10% of the granules trapped in the dryer and moving to the zone output from the dryer, and the rest of the mass of granules of fine fraction reaches the zone output of the granules through the drain line to an external classifier, transportation for treatment and through the cascades clean again enters the mixer for granulation.

Thus, when the above admission classification commodity fraction does not undergo significant changes in grain size, which remains predominantly in the range of 100-1000 microns.

The method and apparatus according to the present invention solve the problem increase the yield of granules PKN commodity fraction 500-800 microns.

This task is solved in that in a method of producing granulated PKN, namely that the product of the interaction of a stable solution is in hydrogen peroxide and soda is brought into contact with Securom in the form of granules PKN, mixed and subjected to drying in a fluidized bed, with the simultaneous classification of the granules by size, select a portion of the dried pellets for separation of the target product, and the rest are used as reture, according to the invention a solution of baking soda and hydrogen peroxide result in interaction in a molar ratio of 1:1,45-1,57 within 5-21 seconds, retur hydrate solution percarbonate sodium to a moisture content of 6-12%, and the dried granules are classified in the area of the output from the dryer at a speed of wool so that pellets of a specified minimum size and exceeding it are removed from the dryer on the selection of the target product, and the granules is less than the specified the minimum size is returned to the process as Remora.

Proposed the molar ratio of the original solutions of caustic soda, and hydrogen peroxide (1:1,45-1,57) and their interaction (5-21 s) allow you to get PKN in the form of a solution. With increasing humidity, retur above 12% is driving the wet weight of the output from the mixer, and when the humidity values below 6% increase in the heterogeneity of the composition of the mass and the loss of stability of the product. When the molar ratio solutions of caustic soda and hydrogen peroxide is less than 1:1,45, interaction time to 5 seconds and wetness reture to 6% of the observed change in the distribution curve of crystals PKN size is towards integration of dispersed product (more than 1.5 mm up to 20-30%) and decrease in bulk density. When the molar ratio solutions of caustic soda and hydrogen peroxide is greater than 1:1,57, the time of their interaction over 21 sec and humidifying rature above 12%, a deterioration of the conditions of granulation and change the distribution curve of crystals PKN towards more fine product and an increase in bulk density of the final product.

This task is solved by the fact that in the known device for obtaining granulated percarbonate sodium containing connected in series with the supply system of reagents, one or two of the reactor and mixer-granulator, a fluidized bed dryer with gas grill neprovalnoy type and a means for separating granules into fractions, line removal of one of the factions which is the drain line of the target product, and the mixer is in communication with the dryer in the zone of entry of the wet granules and in the zone of the conclusion of dry granules in a classifier, according to the invention on the gas grid in the area o dry pellets made excavation in the form of a semicircle, the outlet box of the dryer below level distribution grid and provided with a sloped chute, the lower end of which is rigidly fixed to the body of the dryer under the outlet box, and the top is at the level of the gas distribution grid, repeats the shape of the recess and separated from her slit gap, p is the NIC which have a bias toward the center of the semicircle, formed by a notch on the distribution grid itself slit gap provided with a gas supplying channel, and over the outlet box inside the dryer has a divider in the form of a triangular prism so that the flow of gases passing through the slit gap falls on the first third of the length of the cutting edges of the prism. Moreover, the notch on the distribution grid has a diameter equal to 1/3-1/4 of the width of the lattice, and on the edge of the recess has a visor-barrier having a slope 25-45° to the center of the semicircle formed by the recess. In addition, the angle of inclination of the walls of the gap-type is mainly from 25 to 90° relative distribution grids, and the gas supplying channel gap-type placed in under-grid space of the dryer and is L-shaped, with its vertical portion formed by the front wall of the dryer and the wall of the semicircular or U-shaped, paired with edge notches or gas grill so that the cross section of the vertical part of the channel fits slit gap, and the horizontal portion has a rectangular cross-section and is connected to the inlet side of the duct for supplying combustion gases under-grid space, and the upper the wall of the horizontal part of the channel continued in the form of a plate and introduced into the flue gas duct at a distance of 0.2-0.4 it is iameter and separates up to 6% of the area of its cross section, and at a distance of 0.1 to 0.2 of its diameter from the inlet pipe installed valve regulating the flow of gases traveling in a gas-feeding channel. In addition, the triangular base of the divider lying on the body of the dryer has a vertex angle 90-120°directed downwards, and the cutting edge has a slope to the base of the prism 30 to 60°. In addition, the gas distribution grid of the dryer has an inclination to the horizontal of up to 2° in the direction of motion of the granules.

Figure 1 shows the General setup diagram, figure 2 shows a cross-section of the dryer - view a, figure 3 shows a cross-section of the dryer - a view B, figure 4 shows a cross-section of the dryer - view and cross-section of the duct - type,

The device has connected in series: the delivery system initial reagents, including capacity 1 for a stabilized aqueous hydrogen peroxide solution, capacity 2 to a stabilized aqueous solution of soda and one or two reactor 3, connected by lines 4 and 5 with tanks 1 and 2, one or two mixer-granulator 6 adjacent to the opposite lateral walls of the dryer 7, representing the twin-screw conveyors are equipped with engines with an adjustable number of revolutions of the screw and mounted for rotation in opposite directions. The dryer 7 is connected through line 8 with means for separating granules size classify what ektorom 9 and equipped with a host of dust, includes cascade AIDS cleaning of flue gases from dust - cyclones 10 and 11 connected to the dryer 7 through line 12 and bunkers-nakopitelya 13 and 14 located under the cyclone and connected by lines 15 and 16 with the mixer-granulators 6 to return to them trapped dust PKN; furnace gases from the host are passed through a dust collection system wet cleaning 17 and released into the atmosphere.

The classifier 9 is a two-stage vibrating screen, the middle line 18 which is line removal of the target product for warehousing, for example, in soft containers 19 and coarse fraction than the configured maximum size (if it appears), line 20 is fed to the mill 21 and after grinding through the storage hopper 22 through line 23 and line 12, through the cyclones 10 and 11, bunkers drives 13 and 14 and then along the lines 15 and 16 is returned to the mixer-granulators 6 as Remora.

Dryer 7 has a rectangular cross-section, equipped with a gas grill 24 neprovalnoy type, living section which decreases from the zone of entry of the wet granules to the zone output of dry granules which notch 25 in the form of a semicircle, the center 26 which is located at the point of intersection of the Central vertical axis of the end wall of the dryer 7 and the Central horizontal axis of the gas distribution grid 24, and the diameter of passes p is the line of intersection of the gas distribution grid 24 with the front wall and is 1/3-1/5 of the width of the dryer, and on the edge of the recess 25 has a visor - barrier 27 height 8-10 mm and with a gradient of 25-45° to the center 26 of the recess 25. Itself naturally grating 24 is installed with an inclination of up to 2° to the horizontal in the direction of motion of the granules.

Dryer 7 in the zone of the conclusion of dry granules supplied with outlet box 28, placed on the end wall, which has an inclined chute 29, the lower end of which is rigidly fixed to the end wall of the dryer, and the upper end is located at the level of the gas distribution grid 24, follows the shape of the notches 25 and forms with her slit gap 30 with a width of 2.0-6.0 mm, mainly 3,0-5,0 mm, covered by a canopy-barrier 27 from direct penetration of the pellet, and the walls of the slot gap 30 have a bias toward the center 26 of the recess 25 from 25 to 90° relative distribution grid 24.

Slit gap 30 has an L-shaped gas supplying channel 31, is placed in the under-grid space of the dryer 7, the vertical portion of which is formed by the front wall of the dryer and the wall, which may be semicircular shape, paired with the edge of the recess 25 or U-shaped, paired with the gas distribution grid 24 so that the cross section of the vertical part of the channel fits slit gap 30, and the horizontal part of the channel has a rectangular cross-section and is connected to the inlet cone for under the Chi in under-grid space of the dryer 7 flue gases, coming at the expense of the fan 32 through the heat source 33 through the gas duct 34, and an upper wall of the horizontal part of the channel 31 is continued in the form of a plate and introduced into the flue gas duct 34 at a distance of 0.2-0.4 diameter and separates up to 6% of the sectional area of the duct 34, and at a distance of 0.1-0.2 of the diameter of the duct from the inlet pipe installed regulating valve 35 for controlling the flow of flue gases going to the gas supplying channel 31.

To ensure high performance installation it is advisable to use two mixer-granulator 6, each of which is in communication with the dryer 7 Windows 36 to return the dried granules as reture and Windows 37 to output the wet granules in the dryer.

Over the outlet box 28 along the Central vertical axis of the end wall of the dryer 7 is installed divider 38 in the form of a triangular prism whose base is a triangle with a Central angle of 90-120°facing down, lies on the body of the dryer, and the cutting edge has a slope to the base of the prism 30 to 60°. Moreover, the prism is set so that the air flow from the gap-type 30 falls on the first third of the length of the cutting edges.

Granulated percarbonate sodium with the specified fractional composition is produced by building up layers of the product of the interaction of stable aqueous solutions of caustic soda and peraki and hydrogen on the seed particles, granules, which before the beginning of the process to fill the mixer-granulators 6 and the gas distribution grid 24 of the dryer 7, and to stabilize the process of cleaning flue gas from a pulverized PKN also pre-fill returm storage hopper 13 and 14 to the bottom of the neck of cyclones 10 and 11, and further process the granulation process as the seed particles (retur) use a portion of the dried granules returned from the dryer after 7 classification on the specified minimum size, pulverized fine PKN captured from the dryer 7 cyclones 10 and 11 during the period of dehydration (drying) of the granules in suspension layer and obtained after grinding at the mill 21 pellets coming from the classifier 9, also returned through the cyclones 10 and 11 and the storage hopper 13 and 14 in the mixer-granulators 6 lines 15 and 16.

In the reactor 3 through the control valves on lines 4 and 5 serves threads stabilized aqueous solutions of hydrogen peroxide and soda, supporting interaction time (from 5 to 21 sec) and the concentration of sodium carbonate and hydrogen peroxide in a ratio (1:1,45-1,57)to synthesized PKN remained in the dissolved form, i.e. in a stable unsaturated solution. The resulting reaction mass in the form of a solution (without crystal formation) comes in a mixture of the spruce-granulators 6, where distributed over the surface of the seed particles PKN, wets and spreads them within 12-25 seconds, achieving an average moisture content of 6-12 wt.%, preferably 6-9 wt.%, then wet granules through the Windows 37 are displayed in the dryer 7 distribution grid 24, which is used to supply heated to 190-210°and flue gases through the heat source 33 through the gas duct 34, which is installed partition, which is a continuation of the upper wall of the channel 31 and separates up to 6% of the total volume of the combustion gases through the channel 31 with the regulation of the speed of their passage through the slit gap 30 through valve 35 are received in the dryer 7, which form a gas curtain in the form of palestra. The main part of the flue gas is delivered under the gas distribution grid 24, which is at the entrance has increased the living section, which contributes to the rapid distribution of moist granules over the entire width of the gas distribution grid 24, and increased living section at the entrance and a gradient of up to 2° to the horizontal in the direction of movement of granules prevents clumping of particles at the inlet and facilitates the movement of pellet weight evenly over the entire length of the lattice, and the reduction of the living section fold, by zones, along the length of the gas distribution grid 24 in the ratio of 2-4:1, becoming the public 3:1, between the live section at the entrance of the wet granules and the living section in the zone of the conclusion of dry granules contributes to the process of dehydration (drying) of granules on graphs of constant and decreasing drying rate and to achieve the desired humidity granules at the outlet of the dryer 7. In the area of the output from the dryer dried granules get on the gas curtain in the form of palestra formed by the flow of the combustion gases through a slit gap 30 with the specified speed regime where are classified by the speed of wool so that granules with a diameter smaller than the specified size, for example 500 μm, submitted two ravnovyesnyye threads formed by divider 38 in the form of a triangular prism, through a stagnant zone at the end of the lattice, at its junction with the side and end walls of the dryer 7, the Windows 36 and sent together with the particles of stagnant zones in the mixer-granulators 6 as reture for the next cycle of granulation, the granules with a diameter greater than the specified lower limit (500 microns and above), falling through the gas curtain and the chute 29 through outlet port 28 through line 8 enter the classifier 9 for the final classification on the upper limit of the specified size of the target product (if any), for example, 800 μm, from the intermediate part of the classifier 9, line 18 pellets of predetermined fraction (500-800 microns) pic is upaut for storage in soft containers 19.

The following are examples of the implementation of the method.

Example 1. In each twin-screw mixer-granulator 6 download for 200-250 kg seed particles PKN size up to 400 µm particle size distribution:

400 µm53,52%
300 mcm10,4%
200 microns5,32%
100 mm28,13%
>100 mm2,63%

and the content of the AK - 14,23 wt.%.

Distribution grid 24 that is installed with a slope of 1° to the horizontal and with an area of 12.5 m2with a width of 2.0 m, based 270-300 kg per square meter grid load seed particles PKN size up to 500 microns with a particle size distribution:

500 mcm46,18%
400 µm18,64%
300 mcmto 6.43%
200 microns12,07%
100 mm9,88%
>100 mm6,8%

and the content of the AK-14,15 wt.%.

Fall asleep in a storage hopper 13 and 14 to 500-600 kg to the bottom of the manhole cyclones 10 and 11 seed particles PKN size up to 400 µm particle size distribution:

400 µm49,36%
300 mcm17,58%
200 microns14,81%
100 mm8,02%
>100 mm10,23%

and the content of the AK-14,23 wt.%.

Prepare a 21.5-22.0 percent aqueous solution of technical soda ash, at 30-35°injected With sodium polyphosphate, the mixture is filtered and mixed with an aqueous solution of sodium silicate and get stable soda solution of the following composition, in wt.%:

Na2CO322
Na2SO4(of soda)0,03-0,05
NaCl (sodium)0,4-0,45
Polyphosphate sodium0,1-0,23
Sodium silicate (liquid glass)To 0.29
WaterRest

Preparing a stabilized aqueous hydrogen peroxide solution of the following composition, in wt.%:

H2O2a 38.5
MgSO4·7H2O0,05
WaterRest

To obtain the solution percarbonate sodium in the reactor 3 serves a cooked-stable solutions of CA is itinerancy soda with volumetric flow Q=2300 DM 3/h and hydrogen peroxide with a volumetric rate 309,7 DM3/h (molar ratio of baking soda and hydrogen peroxide is 1:1,45). In the reactor 3 at a temperature of 30-40°C for 6-8 seconds, the formation of an aqueous solution of percarbonate sodium, which then pans - distributors served in the mixer-granulators 6, which moistens the seed particles PKN to a moisture content of 7-8% with vigorous stirring while moving moist granules to the Windows 37, where they are transported to the gas distribution grid 24, blown flue gases with a temperature of 190-195°C. the temperature of the flue gases at the inlet of the dryer 95-112°C, the temperature of the material in the zone of entry of the wet granules in the dryer 60-90°C, the temperature of the material at the end of the dryer no more than 90°C.

Given the lower grain size of 500 μm. The speed of wool for granule size of 500 μm is ≅ 3,1 m/s.

The gap 30 forms a semicircle with a diameter of 0.5 m, which is 1/4 of the width of the lattice, and with a width of 5 mm has an area of 0,008 m2. Wall gap-type have a bias 90° to the gas grid, and the deflector barrier was installed at an angle of 40° to the horizontal, the angle of inclination of the jet of air curtains in this case will be about 30°. The flow of flue gases through the gap 30 regulating valve 35 based 90 m3/PM

Resettelement following indices: peak of the triangular base has an angle 120° the angle of the cutting edge to the base 45°.

Plant capacity:

- the first hour of 750 kg of granulated PKN;

- the second hour of 800 kg of granulated PKN;

third and subsequent hours up to 900 kg of granulated LTU.

Examples 2-3. The process is conducted as in example 1, but with the change in the molar ratio of initial stable solutions of caustic soda and hydrogen peroxide, the time of interaction, degree of wetness reture, time and delivery speed uverennyh granules mixer-granulators in the dryer.

Data on management of technological processes in the examples 1-3 and the quality of the resulting product are shown in table 1.

Table 2 presents comparative data on the fractional composition of granulated PKN obtained in examples 1-3 in comparison with the prototype.

The content of AK in the samples was determined by the method EAT 07278.

The stability of the samples was estimated by the method of EATING 10005, by comparing the content of AK in the samples before and after the test in the climatic chamber, by mixing with the zeolite in a ratio of 50/50 and aging at a temperature of 32°C and a relative humidity of 80% within 48 hours.

Similarly, you can get PKN any given fractional range, for example, 300-600 μm, 400-700 microns etc.

Table 1
No. n The molar ratio of soda and peroxideInteract soda and hydrogen peroxide, secHydrating reture in the mixer-granulators, %The time of mixing the wetted granules in the mixer-granulators, sThe temperature of the flue gases gases, °The humidity of the obtained pellets, %The content of active oxygen, %Bulk density, kg / m3Stability, %
1.1,0:1,456-87-812-14190-1952,7314,1109356,83
2.1,0:1,512-148-916-18195-2052,0813,94112156,24
3.1,0:1,5718-219-1022-25200-2101,94 13,97113855,91
Table 2
The mesh size of the sieve, mmGranulometric composition of the product, % example 1Granulometric composition of the product, % example 2Granulometric composition of the product, % example 3Granulometric composition of the product, % prototype
from the dryerclassifierfrom the dryerclassifierfrom the dryerclassifierfrom the dryerclassifier
1,62,18-0,89-0,07-0,6-
1,23.04 from-1,17-0,94-1,79-
10 18,519,528,328,503,183,212,645,3
0,856,1459,2323,9624,4729,6830,06,7013,47
0,6314,7715,5858,1459,3647,7448,2217,7135,63
0,5lower than the 5.375,677,51to 7.6718,39a 18.5723,4745,6
<0,5------47,09-
The output of the pellet fraction 500-00 µm - 94,78%The output of the pellet fraction 500-800 μm - 97,94%The output of the pellet fraction 500-800 μm - 98,99%The output of the pellet fraction 500-800 μm - 49,71%

1. A method of obtaining a granulated percarbonate sodium, namely, that the product of the interaction of stable aqueous solutions of caustic soda and hydrogen peroxide in the form of a solution of percarbonate sodium is brought into contact with Securom in the form of granules and fine percarbonate sodium, stirred and subjected to drying in a fluidized bed with a simultaneous classification of particles selected portion of the dried pellets, to highlight the commodity fraction, and the rest of granules used as reture, characterized in that the solutions of caustic soda and hydrogen peroxide result in interaction in a molar ratio of 1:1,45-1,57 within 5-21 with, retur hydrate solution percarbonate sodium to the moisture content of 6-12%, and the dried granules are classified in the area of the output from the dryer at a speed of wool so that pellets of a specified minimum size and exceeding it are removed from the dryer on the selection of the target product, and the granules is less than the specified minimum size are returned to the process as Remora.

2. Apparatus for producing granulated percarbonate sodium containing pic is edutella United supply system reagents one or two of the mixer, a fluidized bed dryer with gas grill neprovalnoy type and a means for separating granules into fractions, line removal of one of the factions which is the drain line of the target product, and the mixer is in communication with the dryer in the zone of entry of the wet granules and in the zone of the conclusion of dry granules in a classifier, wherein the distribution grid in the area o the dried granules made excavation in the form of a semicircle, the outlet box of the dryer is placed below the level of the gas distribution grid and provided with a sloped chute, the lower end of which is rigidly fixed to the body of the dryer under the outlet box, and the upper end is located on the level of gas-distributing grating reflects the shape of the grooves and separated from her slit gap, which is provided with a gas-feeding channel, the walls of the slot gap have a bias toward the center of the semicircle formed by the notch on the distribution grid, and over the outlet box inside the dryer has a divider in the form of a triangular prism, so that the air flow passing through the slit gap falls on the first third of the length of the cutting edges of the prism.

3. Installation according to claim 2, characterized in that the diameter of the recess on the gas distribution grid is equal to 1/3-1/5 of the width of the dryer.

4. Installation according to claim 2, characterized in that the Roman excavation installed the deflector barrier, having a slope 25-45° to the center of the semicircle formed by it.

5. Installation according to claim 2, characterized in that the width of the slot gap is 2.0 to 6.0 mm

6. Installation according to claim 5, characterized in that the angle of inclination of the walls of the gap-type is mainly from 25 to 90° relative distribution grid.

7. Installation according to claim 2, characterized in that the gas supplying channel gap-type placed in under-grid space of the dryer, is L-shaped, and its vertical portion formed by the front wall of the dryer and the wall is semicircular or U-shaped, paired with edge notches or gas grill, so that in cross section the vertical part of the channel fits slit gap, and the horizontal portion has a rectangular cross-section and is connected to the inlet side of the duct for supplying combustion gases under-grid space, and an upper wall of the horizontal part of the channel continued in the form of a plate and introduced into the flue gas duct at a distance 0,2-0,4 its diameter and separates up to 6% of the area of its cross section, and at a distance of 0.1 to 0.2 of its diameter from the inlet pipe installed valve regulating the flow of gases traveling in a gas-feeding channel.

8. Installation according to claim 2, characterized in that the triangular base of the divider lying on the body of the dryer, there is t a vertex angle 90-120° directed downwards, and the cutting edge has a slope to the base of 30-60°.

9. Installation according to claim 2, characterized in that the gas distribution grid of the dryer has an inclination to the horizontal of up to 2° in the direction of motion of the granules.



 

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2 dwg

FIELD: device for drying of free-flowing materials by superheated vapor in a closed container.

SUBSTANCE: the container has a set of lengthened and practically vertical production cells open from the top, positioned around the central part containing a heat exchanger. The last of the mentioned production cells has a closed bottom and serves as an unloading cell, whereas the bottom of the other cells is vaportight. Superheated vapor from the heat exchanger is injected through the vaportight bottom of the cells, the free-flowing material is subjected to drying as it passes through the production cells. The upper part of the container has a dust separation system in the form of a cyclone for cleaning of vapor coming out upwards from the production cells before it returns through the heat exchanger. Vapor is fed to the cyclone in the upper part of the cyclone so as to separate the larger wet particles and return them to the production cells before the vapor is fed to the cyclone.

EFFECT: enhanced capacity without reduction of the quality of the ready-made product.

8 cl, 2 dwg

FIELD: drying equipment, particularly for agriculture, food and other industries.

SUBSTANCE: drying plant for drying powder material, preferably grain, comprises loading hopper, drying part including chamber with fluidized powder material layer, cooling part, electric heater and centrifugal pump. The chamber has conical body provided with inclined perforated grids arranged in the body. Grain layer thickness stabilizers are arranged inside the chamber over perforated grids. The grain layer thickness stabilizers are made as vertical plates sliding along vertical axis. Cooling chamber comprises grain drying and cooling governors made as frequency-controlled rotary dischargers.

EFFECT: increased efficiency.

1 cl, 2 dwg

FIELD: machines or apparatus for drying materials in loose, plastic, or fluidized form, particularly spray driers adapted to be used in different industries.

SUBSTANCE: drying plant has drying chamber with side surface composed of plates arranged so that slots are created between adjacent plates. The slots are adapted to spray drying agent into the chamber. The plant also has liquid product sprayers. Tangent of angle ψ of drying agent spray inside the chamber through each slot is selected from equation. The angle ψ provides elimination of sticking of particles obtained from dried liquid product to plates. Necessary number of plates and height of slots defined between adjacent plates are determined from angle ψ tangent with taking into consideration drying chamber perimeter. Angle ψ is defined between velocity vector of drying agent entering into the chamber through the slot and tangent of drying chamber surface generator at flow inlet area. In disclosed drying method radial component of drying agent flow velocity acts on particle with force, which is not less than sum of centrifugal force and gravity force.

EFFECT: possibility to perform drying under atmospheric air temperature.

2 cl, 4 dwg

Vortex dryer // 2263262

FIELD: drying equipment.

SUBSTANCE: device has body, device for input of drying agent, made in form of snail, central pipe, having conical head, made in form of bell mouth, with possible axial movement, body being made in form of rotary hyperboloid, and central pipe serves for offloading dried material and its movement in axial direction is provided by adjusting device, mounted in lower portion of body, and bell mouth shaped piece is used as diffuser.

EFFECT: higher speed of operation, higher efficiency, higher quality, broader functional capabilities, higher efficiency.

1 dwg

FIELD: agricultural machinery industry, in particular, drying of free-flowing materials, for example, grain.

SUBSTANCE: the aerochute has a chamber, bottom of air-distributing grates and dissectors, shutter for adjustment of material delivery from the feed bin, chain-drag leveling transporter with a height adjustment mechanism and a level detector (for example, similar to the detector of the machine for seed pickling SP-10) of the drying material. A device for shut off of the dried lower layer is installed between the transporter and air-distributing grates, it includes louver boxes, carriage with shelves, carriage reciprocating motion mechanism, mechanism for carriage adjustment in height, furnace unit and a fan for supply of the heat-transfer agent through the channel into the chamber that has a shutter of the unloading window, tray with on inspection window.

EFFECT: enhanced efficiency and economy of the drying process.

2 dwg

FIELD: drying of dispersed materials in food making, chemical, microbiological and pharmaceutical industry branches.

SUBSTANCE: method comprises steps of blowing heat transfer agent through initial material during two stages; at first stage blowing in two successively alternating modes. At first mode heat transfer agent is fed under gas distribution grid and drying process is performed in fluidized bed. At second mode heat transfer agent is fed through branch pipes into drying chamber along periphery tangentially and drying process is performed in annular rotating bed. At second stage heat transfer agent is fed as one low-speed flow under gas distribution grid into drying chamber and simultaneously impulse second flow is fed through branch pipe normally relative to first flow. Installation includes drying chamber, feeding and discharging air ducts, gas distribution grid. Drying chamber includes steam jacket with draining branch pipe, built-in heat exchanger and branch pipes for feeding heat transfer agent along periphery tangentially.

EFFECT: intensified drying process.

FIELD: food, alcohol, brewery, combined fodder, chemical and other industries.

SUBSTANCE: invention relates to drying facilities and it can be used for drying different disperse materials under pneumatic transportation conditions. In proposed pneumatic drier for polydispersed materials spiral channel of drying chamber is made with constant section over entire length of channel in form of at least several identical turns arranged one after the other and orientated vertically. Each turn of channel includes alternating straight-line and curvilinear sections. Each curvilinear section if channel connecting straight-line sections is made with constant radius, and channel formed by each turn has one common wall with following turn in direction of flow of gas suspension. Optimum ratio between height "a" and width "b" of spiral channel of drying chamber is within 0.4-0.8, and optimum ratio between length of curvilinear and straight-line sections of one turn of channel is within 1.1-1.35.

EFFECT: improved drying of polydispersed materials.

4 cl, 2 dwg

FIELD: mechanical engineering; heat treatment of materials.

SUBSTANCE: proposed device contains swirl chamber with bottom-diffuser and valve swirler-grinder with turbine section and grinding section with beaters made in form of truncated cone, charging device, evaporator and gas supply duct in which turbine section of swirler-grinder is arranged on bottom-diffuser, grinding section is arranged on drive shaft and provided with vanes connected to its conical surface for changing angle of vane tilting relative to swirl chamber wall, and base on periphery of which beaters are connected, being pointed downwards, and charging device is made in form of chute arranged coaxially to swirl chamber.

EFFECT: improved reliability of device in operation.

1 dwg

FIELD: inert carrier for drying of dispersions, suspensions, paste materials, colloidal and true crystal forming solutions, polymerizing emulsions and mixtures thereof in fluidized bed.

SUBSTANCE: inert carrier represents inert bodies placed in drying box and consists approximately 50 % of fluoroplastic and 50 % aluminum inert particles. Particles have similar size and density, but different thermophysical, adhesive, physico-mechanical, and electrophysical characteristics.

EFFECT: drying with increased velocity, dried material with improved exfoliation and quality.

10 dwg

FIELD: chemical industry; methods and devices for production of sodium percarbonate with a stabilizing coating.

SUBSTANCE: the invention is pertinent to the field of chemical industry, in particular, to the method and the device for production of sodium percarbonate with a stabilizing coating and may be used in the production of the oxygen-containing bleaches made on the basis of sodium percarbonate (SPC), which is also applied as a component of synthetic washing agents (SWA). The initial solutions of hydrogen peroxide and sodium are brought in contact with the recycle made in the form of the SPC granules in the mixer, dry in the boiling layer in the driers, a part of the granules are fed into the classifier for separation by the granules size for separation of the granules of the target fraction, the remaining part of the granules are directed back in the mixer in the capacity of the recycle. The target fraction of the SPC granules is in series collected in the storage containers and subjected to vacuumization. Simultaneously the stabilizing agent is subjected to the vacuumization in the measuring containers. The so treated SPC granules and the solution of the stabilizing agent are brought in contact in the additional mixer first at the residual pressure of no more than 25 kPa with the following heighten of the pressure up to no less than 95 kPa or to the atmospheric pressure and dry in the additional drying machine of the boiling layer. At that the finish product stability achieves to 66.0-72.0 %, consumption of the coating material - to 0.9-2.8 weight/weight %, the contents of the active oxygen - 13.8-14.1 mass %. The technical result is the increased stability of the granulated sodium percarbonate with the stabilizing coating.

EFFECT: the invention ensures the increased stability of the granulated sodium percarbonate with the stabilizing coating.

8 cl, 2 tbl, 2 dwg

FIELD: laundry detergent useful in both hand laundry and washing machine.

SUBSTANCE: claimed synthetic detergent contains (mass %): surfactant 6,0-8,0 non-ionic surfactant 2-4; sodium tripolyphosphate 20; peroxide bleaching agent 10-15; carboxymethylcellulose (calculated as 100 mass % of base substance) 0.5; polycarboxylate 0.25-1.0; sodium silicate (calculated as SiO2) 3-5; soda ash 5.0; optic bleaching agent 0.1-0.3; polyvinyl pyrrolidone 0.3-0.5; tetraacetylethylene diamine 1-2; 2,6-ditertbuthyl4-dimethyl-aminomethylphenole as stabilizer 0.005-0.20; flavor 0.1-0.2; reaction product of oxyethylated isononylphenole, triethanolamine and sodium hydroxide 2-3; and balance: water and sodium sulfate to 100 %. Surfactant contains linear sodium alkylbenzenesulfonate or mixture thereof with fatty acid soap, or carboxymethylated isononylphenole ethoxylate sodium salt; non-ionic surfactant contains oxyethylated alkylphenoles or polyethylene glycol esters of synthetic fatty alcohols.

EFFECT: detergent of improved quality providing additional softness of washed fabric.

4 cl, 2 tbl, 6 ex

The invention relates to catalytic bleaching of substrates, for example, subjected to washing fabrics, atmospheric oxygen or air

The invention relates to macrocyclic metal complex ligands, used as catalysts for the oxidative bleaching

The invention relates to detergents and can be used both for manual and machine washing and soaking of all kinds of textile products, including non-ferrous, and other household needs

Synthetic detergent // 2230101
The invention relates to detergents and can be used both for manual and machine washing of all types of textile products, as well as for other household needs

The invention relates to products for cleaning household surfaces

The invention relates to the technical detergents for handling the technological equipment of the dairy industry from burns and "milk stone", made of glass, plastic, metal or combinations of these materials

FIELD: chemical industry; methods and devices for production of sodium percarbonate with a stabilizing coating.

SUBSTANCE: the invention is pertinent to the field of chemical industry, in particular, to the method and the device for production of sodium percarbonate with a stabilizing coating and may be used in the production of the oxygen-containing bleaches made on the basis of sodium percarbonate (SPC), which is also applied as a component of synthetic washing agents (SWA). The initial solutions of hydrogen peroxide and sodium are brought in contact with the recycle made in the form of the SPC granules in the mixer, dry in the boiling layer in the driers, a part of the granules are fed into the classifier for separation by the granules size for separation of the granules of the target fraction, the remaining part of the granules are directed back in the mixer in the capacity of the recycle. The target fraction of the SPC granules is in series collected in the storage containers and subjected to vacuumization. Simultaneously the stabilizing agent is subjected to the vacuumization in the measuring containers. The so treated SPC granules and the solution of the stabilizing agent are brought in contact in the additional mixer first at the residual pressure of no more than 25 kPa with the following heighten of the pressure up to no less than 95 kPa or to the atmospheric pressure and dry in the additional drying machine of the boiling layer. At that the finish product stability achieves to 66.0-72.0 %, consumption of the coating material - to 0.9-2.8 weight/weight %, the contents of the active oxygen - 13.8-14.1 mass %. The technical result is the increased stability of the granulated sodium percarbonate with the stabilizing coating.

EFFECT: the invention ensures the increased stability of the granulated sodium percarbonate with the stabilizing coating.

8 cl, 2 tbl, 2 dwg

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