Method of neutralization of the water combustible solutions of the acetic acid at the automated batching-packing machine
FIELD: chemical industry; methods of neutralization of the water combustible solutions of the acetic acids at the computerized batching-packing machine.
SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to the method neutralization of the acetic acid and its solutions at leakages and accidents. The method of neutralization of the water combustible solutions of the acetic acids at the computerized batching-packing production line provides for the treatment of the surface, on which there is a leakage of the acetic acid, with the powdery anhydrous sodium carbonate. The treatment of the spilled acetic acid is exercised till formation of the paste and the paste is left on the surface for a while. At the second and the subsequent leakage of the acetic acid on the tray and at formation of the liquid phase the place of the spill is treated with a sodium carbonate till formation of the paste with the purpose for binding the liquid phase. In the case the acetic acid spills on the surfaces located outside of the tray, the neutralization of the acetic acid is exercised by water till gaining the 25-30 % solution. The surface treatment with the powder of the sodium carbonate at the first spill is exercised at the following components ratio (in mass %): Na2CO3:CH3C00H = 1.6÷4.0:1. The invention ensures reduction of the wastes of the production process, allows to reduce emissionof CO2 and allows to diminish toxicity of the production process.
EFFECT: the invention ensures reduction of the wastes of the production process, reduction of emissionof CO2 and reduction toxicity of the production process.
The invention relates to the field of chemistry, in particular to neutralize the acetic acid and its solutions when spills and accidents.
Known methods of neutralization of acetic acid or solutions of water 1÷4%-governmental solutions of sodium bicarbonate or water to 2.5÷10%-governmental solutions of sodium hydroxide. (Safety rules and procedure of liquidation of emergency situations involving dangerous goods during their transportation by rail from 25.11.96, No. CM-407, s).
The disadvantage of the methods is a great solution flow rate and, consequently, large amounts of wastewater containing sodium acetate, which must be cleaned before being discharged. In addition, the disadvantage is the release of a large amount of carbon dioxide in the air of working zone and the atmosphere.
The closest in technical essence and the achieved result is a way of neutralization of 70; 80%of the energy of aqueous solutions of acetic acid on filling sealing machine (technical regulations for production and packaging 70; 80%acetic acid №TR 04-50572204-04. - Novosibirsk: LLC "Ibprophen", 2004. - P.10-11).
The spill solution of acetic acid on the pallet and surfaces above the pallet is neutralized with sodium carbonate solution. Is formed in the solution sodium acetate. Complete neutralization of control by the pH.
The disadvantage JV is soba is the presence of large amounts of wastewater with high concentration of sodium acetate, that leads to excretion of sodium acetate required sophisticated technology, including evaporation, crystallization, filtration. The disadvantage of the prototype is also high consumption of powdered sodium carbonate, associated with the fact that sodium carbonate is used in excess. In addition, by neutralizing acetic acid produce large quantities of carbon dioxide released into the air of the working zone and the atmosphere. The disadvantage of this method is the large surface neitralizetu mixture and a negligible temperature increase, which leads to the release of significant quantities of vapor of acetic acid, that is, the toxicity of the process.
Object of the invention is the waste reduction process, reducing costs neutralizing agent, reducing the allocation of CO2and decrease the toxicity of the process.
This object is achieved in that in the method for the elimination of combustible water solution of acetic acid on an automated filling and capping line, including surface treatment, which is poured acid, powdered anhydrous sodium carbonate according to the invention the processing of acid spilled on the tray, leading to the formation of the paste and the paste is removed, the second and subsequent spill of acetic acid on the don in the case of liquid phase add sodium carbonate to form a paste, in case of contact with acetic acid on the surface of the outside of the pallet, the neutralization of the acid carried water to obtain a solution with a concentration of 25÷30 wt.%, moreover, the surface treatment powder sodium carbonate when the first spill of acetic acid is carried out at the following ratio of components:
Automated filling and closing exercise machine filling sealing the modified B3-OD-2-/3-02/03/ on THE other 3-1768. The machine is designed for packing 70; 80%acetic acid under vacuum. Filling and capping machine is a computerized machine rotary type actuator comprising a hopper plastic tubes, carousel filling and sealing. The power of the motor is not more than 2.6 kW. The basic amount of the acid is poured on a stainless steel container, a portion of the acid can get on surfaces outside of the pallet. Neutralization of the acid carried out as follows.
When the first spill acetic acid spill fall asleep 1.6 to 4.0 wt. parts of sodium carbonate per wt. part of the solution of acetic acid to bind all the water contained in the acid solution and is formed in the neutralization process (equation 1), monohydrate sodium carbonate (the level of the s 2):
Excess acid is bound in sodium diacetate (equation 3) and sodium triacetate (equation 4):
The paste is removed in order to neutralize new portions acid during subsequent floods.
Subsequent spills when the liquid phase of the spill site again treated with powder of sodium carbonate to form a paste for bonding the liquid phase. Subsequent spill is the formation of three-hydrate sodium acetate according to equation (5):
In the event of a spill acid on the outside surface of the pallet processing spend the minimum amount of water, for example, from the sprayer to a solution of acetic acid with a concentration of 25÷30%. At such concentrations, the partial vapor pressure of acetic acid is quite low and is 0.8÷1.1 mm RT. Art. (T=20°).
The table shows data about the safe levels for the products of neutralization according to the invention and prototype (the List of codes and substances polluting the atmosphere. - SPb., 2000).
|Code||The name of the substance||Min, mg/m3|
|3169||Sodium acetate trihydrate||0,100|
The table shows that solid sodium acetate trihydrate and sodium acetate, which is formed on the proposed method of risk comparable with baking soda.
Example 1. When the first spill of 70%acetic acid spilled 171,6 g of acetic acid, which was filled to form a paste with dry sodium carbonate in the amount of 408,7, Got 416,2 g of the monohydrate of sodium carbonate and to 142.1 g of sodium diacetate or 54.6 g of sodium triacetate. Separated respectively 22,0 or 14.7 g of carbon dioxide. The monohydrate of sodium carbonate in the amount of 416,2 g serves as a neutralizing agent in the subsequent spill of acetic acid, and when it is used up completely, subsequent spill fill up powder sodium carbonate.
By neutralizing acid in the prototype used a saturated solution of sodium carbonate and form a solution containing sodium acetate and unreacted sodium carbonate. It stands 44 g of carbon dioxide, which is 2-3 times the amount of CO2obtained according to the invention.
Example 2. When the work machine is tirovannoj filling sealing machine during the shift was released 50 thousand bottles of 70%acetic acid. Broke 90 bottles. The total number of spilled acid was 5,67 kg for the neutralisation of powdered sodium carbonate with the formation of three-hydrate of sodium acetate and triacetate, sodium took 2,532 kg neutralizing agent and stood out 1,051 kg CO2. The total number of solid waste was 7,151 kg by neutralizing the amount of acid in an aqueous solution of carbon sodium would 26,9 DM3solution with a concentration of 13 g/100 cm3and distinguished 1,444 kg CO2.
Example 3. When the automated filling and capping machine during the shift was released 40 thousand bottles of 80%acetic acid. Crashed 72 bottles. The total number of spilled acid was 4,536 kg To neutralize this amount of acid was consumed 2,080 kg of sodium carbonate and the resulting 5,755 kg stagnant paste containing the trihydrate of sodium acetate, sodium diacetate and triacetate sodium. Stood out 0,861 kg of carbon dioxide.
By neutralizing this amount of acid solution of sodium carbonate would 24,64 DM3solution with a concentration of 13 g/100 cm3and distinguished 1,330 kg of carbon dioxide.
Example 4. On an automated filling and capping line was released during the shift 30 thousand bottles 57%acetic acid. Was once the ITA 51 bottle. The total number of spilled acid was 3,213 kg To neutralize the amount of acid required 1,589 kg of sodium carbonate and stood out 0,659 kg of carbon dioxide. Received 4,142 kg of a paste composed mainly of the three-hydrate of sodium acetate. When you neutralize spilled acid with a solution of sodium carbonate would 12,43 DM3solution and distinguished 0,671 kg CO2.
Thus, the proposed method in comparison with the known has the following advantages:
- waste reduction and elimination of technological operations at their disposal;
- reduction neutralizing agent due to the formation of sodium diacetate and sodium triacetate;
- reducing the amount of carbon dioxide released into the air of the working zone and the atmosphere.
- reducing the toxicity of the process due to the spill containment after neutralization with acetic acid, powdered sodium carbonate and increase the speed of neutralization when the temperature in the solid phase.
Method for neutralizing the water-combustible solution of acetic acid on an automated filling and capping line, including surface treatment, which spilled acetic acid, powdered anhydrous sodium carbonate, characterized in that the processing of spilled acid in the FLS to form a paste and the paste is removed, the second and subsequent spill of acetic acid on the pallet when the liquid phase of the spill is treated with sodium carbonate to form a paste, and by ingestion of acetic acid on the surface of the outside of the pallet, the neutralization of acetic acid is carried out with water to get 25-30%-aqueous solution, and processing the surface of a powder of sodium carbonate when the first spill carried out in the following ratio of components by weight: Na2CO3:CH3COOH=1,6-4,0:1.
FIELD: chemical industry; methods of production of acetates.
SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to the method of production of lead tetraacetate. The method provides for realization of interaction of the red-lead with anhydrous acetic acid at the temperatures of 30-40°C with the subsequent separation of the target product not later than 3-5 hours after the termination of reaction. In the capacity of the dehydrating reagent is used the by-product of the interaction - lead diacetate, which forms the hydrated complex with water. The invention ensures production of lead tetraacetate equal to 70-75 % from the theoretical value. The technical result of the invention is simplification of the production process, improvement of the economic features.
EFFECT: the invention ensures simplification of the production process, improvement of the economic features.
FIELD: inorganic syntheses.
SUBSTANCE: method consists in that iron powder is oxidized in acetic acid/acetic anhydride (4%) medium with air oxygen bubbled through the medium, while maintaining iron-to-acetic acid molar ratio 5:1 and temperature 17-25°C. Reaction mixture is thoroughly stirred with blade stirrer at speed of rotation 720-1440 rpm until reaction mixture accumulates 0.75-0.96 mol/kg ferric salt. Thereafter, air is replaced by nitrogen and 4% acetic anhydride based on initially charged acetic acid is added, temperature is raised to 35-40°C, and iron is oxidized with ferric salt until full consumption of the latter. Resulting snow-white ferrous acetate suspension is separated from unreacted iron, filtered off, and dried. All above operations are carried out under a nitrogen atmosphere. Filtrate, which is saturated ferric acetate solution in acetic acid/acetic anhydride mixture, is recycled to reactor to be reprocessed or it is used according another destination.
EFFECT: simplified technology and improved economical characteristics of process due to use of inexpensive oxidant.
FIELD: inorganic syntheses.
SUBSTANCE: ferric acetate is prepared by interaction of metallic iron with acetic acid in presence of an oxidant. Process is carried out at ambient temperature in acetic acid/acetic anhydride medium (weight ratio 5:1) under nitrogen atmosphere. Molar ratio acetic acid/iron/basic ferric acetate is maintained the following: 10:8:1. Reaction mixture is thoroughly stirred with high-speed blade stirrer or shaken at shaking frequency 2 Hz. When consumption of basic ferric acetate is completed, suspension of ferrous acetate is separated by filtration from unreacted iron powder. Precipitate is dried and filtrate returned into the process.
EFFECT: simplified process due to selection of optimal oxidant.
FIELD: industrial inorganic synthesis.
SUBSTANCE: implementation of the method comprises contacting iron in the form of iron powder or iron sidewall adjacent to a body with glacial acetic acid and air oxygen at 17-25°C and vigorous stirring effected by high-speed blade-type mechanical stirrer. Initial acetic acid-to-iron molar ratio is (224÷274):100. Acetic anhydride additive is preferably introduced in amount of 2% based on the initial concentration of acetic acid. When concentration of ferric salt in the mixture reaches 2.70-3.51 mole/kg, stirring is stopped and heavy unreacted iron particles are allowed to settle/ Major mass of product suspension is filtered off and thus obtained basic ferric acetate precipitate is dried. Filtrate, which is saturated acetic acid solution of basic ferric acetate, is returned into reactor to be reprocessed. Yield of desired product achieves 99.2-99.3%.
EFFECT: simplified process and improved economical efficiency due to utilization of inexpensive raw material and accessible oxidant.
FIELD: organic chemistry, medicine, dermatology.
SUBSTANCE: invention relates to zinc and aliphatic halogen-carboxylic acid salts that can be used in treatment of benign neoplasms of skin and visible mucosa tissues. Invention proposes the following formula of zinc and aliphatic halogen-carboxylic acid salts: (1): wherein R means -CHal3, -CHHal2, -CH2Hal and (2): wherein R' means Alk, hydrogen atom (H); R'' means Hal; R' means Alk; R'' means H, Alk wherein in these formulae halogen atom can be represented by fluorine atom (F), chlorine atom (Cl), bromine atom (Br) or iodine atom (J). Invention provides the development of original preparation used in treatment of benign neoplasms of skin and visible mucosa tissues with low toxicity, rapid effect, expressed therapeutic effect and eliciting good tolerance, absence of complications in treatment, healing without formation of scar tissue. The development of the preparation provides expanding assortment of agents used in treatment of such diseases.
EFFECT: enhanced and valuable properties of agents.
FIELD: chemical technology.
SUBSTANCE: invention relates to a method for preparing acetic acid salts, in particular, anhydrous ferrous (II) acetate. Method for preparing anhydrous ferrous (II) acetate involves interaction of metallic iron with acetic acid in the presence of oxidizing agents of ferric oxide Fe2O3 or Fe3O4 and molecular iodine in the mole ratio acetic acid : acetic anhydride : iron oxide = 100:(6-20):(2-2.5), respectively, and in the mole ratio iron oxide : iodine = 100:6.3. The process is carried out at temperature 80°C in the beaded mill of vertical type with high-rotation blade mixer and reflux condenser in the mass ratio of glass beads and liquid phase in the charge = 1:1. The process is carried out with periodic taking off samples of the end product solid phase by filtering and the following recover filtrate and feeding with acetic acid and iron oxide. For compensation of components loss of liquid phase in filtering there are recovered into reactor to the repeated process that is carried out for four times at a time. All procedures of the basic process and filtration are carried out in nitrogen medium. Preferably, method involves using hematite, γ-oxide, iron minium, magnetite or Fe3O4 x 4 H2O as the iron oxide source. Invention provides possibility for preparing anhydrous ferrous (II) acetate and simplifying method due to excluding the evaporation stage in isolation of salt.
EFFECT: improved preparing method.
3 cl, 2 tbl, 8 ex
FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to a method for preparing copper (II) acetate monohydrate that represents organic carboxylic acid salt. Copper (II) acetate monohydrate is prepared by crystallization from solution obtained by mixing acetic acid, alkaline metal acetates or ammonium with copper-containing spent solution used in etching printing boards. Method provides reducing cost of the proposed method for preparing copper (II) acetate monohydrate, retaining purity of product with simultaneous utilization of toxic waste in electronic engineering manufacture - the spent solution in etching printing boards. Also, invention provides reducing material consumptions in preparing copper (II) acetate monohydrate, expanding assortment of materials used for its preparing and utilization of toxic waste in electronic engineering manufacture. Product obtained by the proposed method can be used as pigment, fungicide and copper microfertilizer in agriculture, as catalyst in processes of polymerization, as a stabilizing agent of artificial fibers, for preparing galvanic solutions and preparing other copper compounds.
EFFECT: improved preparing method.
14 cl, 5 ex
FIELD: industrial organic synthesis.
SUBSTANCE: invention relates to continuously producing acetic acid and/or methyl acetate via liquid-phase carbonylation of methanol or a suitable derivative thereof with carbon monoxide in presence of water and catalytic system. Reactor temperature and feeding rate of methanol or suitable methanol derivative are governed by carbon monoxide feeding rate and at least one of parameters determining composition of reaction mixture or removed gases. Preferably, government is effected over many-dimensional predicting regulator of preliminarily programmed electronic device. Concentration of water in reaction medium is maintained at level lower, higher or equal to 14 wt % and that of methyl acetate below 5 % based on the weight of reaction medium. Both concentrations are measured by means of analyzer functioning in neat infrared region.
EFFECT: optimized process conditions and increased yield of products.
19 cl, 2 dwg, 4 ex
FIELD: chemical technology.
SUBSTANCE: invention relates to technology for synthesis of acetic acid by the cabonylation reaction of methanol with carbon monoxide. Method involves preparing the productive flow in the reaction section containing acetic acid, acetaldehyde, water and other impurities. In the cleansing treatment the reaction products are subjected for treatment wherein acetaldehyde impurities are oxidized to either acetic acid after its isolation and recovered to the reaction zone or to carbon dioxide and water that removed from the system. As result, method provides excluding the negative effect of acetaldehyde at step for separation of the reaction products. Oxygen, air or their mixtures, ozone, carbon peroxide or peracetic acid are used as oxidant. As possible variants of the method, the productive flow is fed to distillation column wherein flow of light products or heavy products are isolated under condition that each of these flow involves acetic acid, acetaldehyde and water. Then "light" or "heavy" flow is subjected for oxidation as said above to reduce the concentration of acetaldehyde. As a variant of the method the flow of heavy products can be treated by extraction with water followed by oxidation of acetaldehyde-containing aqueous phase. Invention provides improvement of method due to exclusion of the necessity of purification of the end product from acetaldehyde impurity.
EFFECT: improved treatment method.
20 cl, 3 tbl, 35 ex
FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to the improved method for oxidation of (C2-C4)-alkane and preparing the corresponding alkene and carboxylic acid. Method involves addition of this alkane to contact with molecular oxygen-containing gas in oxidative reaction zone and optionally at least one corresponding alkene and water in the presence of at least two catalysts with different selectivity. Each catalyst is effective in oxidation of alkane to corresponding alkene and carboxylic acid resulting to formation of product comprising alkene, carboxylic acid and water wherein the molar ratio between alkene and carboxylic acid synthesized in the reaction zone is regulated or maintained at the required level by regulation the relative amounts of at least two catalyst in the oxidative reaction zone. Also, invention relates to the combined method for preparing alkyl carboxylate comprising abovementioned stage in preparing alkene and carboxylic acid in the first reaction zone. Then method involves the stage for addition of at least part of each alkene and carboxylic acid prepared in the first reaction zone to the inter-contacting in the second reaction zone the presence of at least one catalyst that is effective in preparing alkyl carboxylate to yield this alkyl carboxylate. Also, invention relates to a method for preparing alkenyl carboxylate comprising the abovementioned stage for preparing alkene and carboxylic acid in the first reaction zone and stage for inter-contacting in the second reaction zone of at least part of each alkene and carboxylic acid synthesized in the first reaction zone and molecular oxygen-containing gas in the presence of at least one catalyst that is effective in preparing alkenyl carboxylate and resulting to preparing this alkenyl carboxylate.
EFFECT: improved method for oxidation.
30 cl, 1 dwg, 5 tbl, 14 ex
FIELD: chemical technology.
SUBSTANCE: invention relates to continuous method for production of acetic acid and/or methyl acetate based on known process of methanol or derivatives thereof (such as dimethyl ether, halogenated methyl or methyl acetate) carbonylation. Process is carried out in homogenous liquid phase under carbon monoxide pressure in presence of catalytic system containing rhodium-based homogeneous catalyst and halogenated promoter, in presence of water in reaction medium and in amount of not less than 14 mass %. In continuous process homogeneous catalyst composition is gradually changed by continuous or discontinuous addition of any iridium compound. Catalyst composition is transformed without process shutdown by transition from rhodium-based catalyst to rhodium/iridium-based catalyst or iridium-based catalyst. Iridium addition makes it possible to decrease water content in reaction system.
EFFECT: modified industrial process of methanol carbonylation by transformation of catalytic system.
19 cl, 7 tbl
FIELD: petrochemical processes.
SUBSTANCE: invention relates to improved C2-C4-alkane oxidation process to produce corresponding alkene and carboxylic acid, which process comprises bringing indicated alkane in oxidation reaction zone into contact with molecular oxygen-containing gas and corresponding alkene and optionally with water in presence of at least one catalyst efficient for oxidation of alkane into corresponding alkene and carboxylic acid. Resulting product contains alkene, carboxylic acid, and water, wherein alkene-to-carboxylic acid molar ratio in oxidation reaction zone is controlled or maintained at desired level by way of controlling alkene and optional water concentrations in oxidation reaction zone and also, optionally, controlling one or several from following parameters: pressure, temperature, and residence time in oxidation reaction zone. Invention also relates to integrated process of producing alkyl carboxylate including above-indicated stage of producing alkene and carboxylic acid in first reaction zone and stage of bringing, in second reaction zone, at least part of each of alkene and carboxylic acid obtained in first reaction zone in contact with each other in presence of at least one catalyst effective in production of alkyl carboxylate to produce the same. Invention further relates to production of alkenyl carboxylate including above-indicated stage of producing alkene and carboxylic acid in first reaction zone and stage of bringing, in second reaction zone, at least part of each of alkene and carboxylic acid obtained in first reaction zone plus molecular oxygen-containing gas into contact with each other in presence of at least one catalyst effective in production of alkenyl carboxylate to produce the same.
EFFECT: enhanced process efficiency.
55 cl, 1 dwg, 7 tbl, 22 ex
FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to technology for manufacturing acetic acid by the carbonylation reaction of methanol with carbon monoxide. Method is carried out in the continuous regimen in the carbonylation reactor wherein methanol and carbon monoxide are fed and catalytically active rhodium-comprising catalyst medium is maintained wherein this medium comprises the following components: water, 0.1-14 wt.-%; methyliodide, 1-20%; alkaline metal iodide salt, 2-20%; methyl acetate and acetic acid, 0.5-30%. The total pressure value in reactor is 15-40 atm. Flow of the reaction products is subjected for rapid evaporation and fed to the distillation stage comprising up to two distillation columns wherein purified acetic acid is separated and some flows recirculating into reactor. Removal of iodide impurities from the final product is carried out by contacting the flow with anion-exchange resin at temperature 100°C, not less, followed by purification stage with sulfocation-exchange resin in form of silver or mercury salt comprising 1% of active sites, not less, at temperature 50°C, not less. The level of aldehyde impurities in the flow recirculating into reactor is regulated by the distillation off method. The content of iodides in acetic acid is less 10 parts/billion. Method provides decrease of energy consumption and preparing acetic acid of high purity degree.
EFFECT: improved producing method.
28 cl, 3 tbl, 7 dwg, 12 ex
FIELD: analytical methods.
SUBSTANCE: invention relates to assessing acetic acid vapors in working zone air of linoleum, acetylcellulose, and alkyl acetate manufacture enterprises. Method comprises sampling air, detecting and recording analytical signal followed by calculation of acetic acid concentration. Sample is placed in detection cell with piezoquartz resonator whose electrodes are preliminarily modified with acetone solution of polyethylene glycol adipate sorbent such that mass of sorbent after removal of solvent were 10-30 μg. Recording of analytical signal is accomplished in the form of response of modified electrodes of piezoquartz resonator 15 sec after introduction of sample into detection cell. Calculation of acetic acid concentration is performed according to equation of calibration curve: ΔF = 1.4CM, where ΔF is response of modified electrodes of piezoquartz resonator, Hz, and CM is acetic acid concentration is air sample, mg/m3. Advantages of method are following: excluded sample preparation stage; reduced assessment time from 7-9 h to 0-45 min (taking into account time used for modifying electrodes and subsequent regeneration of detection cell); increased number of assessments without replacement of sorbent; reduced sorbent restoration time; and reduced assessment error.
EFFECT: accelerated assessment and increased assessment accuracy.
2 tbl, 7 ex
FIELD: chemical engineering.
SUBSTANCE: objective of invention is how to store inflammable 60-80% aqueous acetic acid solutions under winter conditions. Problem is solved by adjusting concentration of acetic acid solution to a value at which crystallization temperature of solution is the same as average temperature in storehouse for a given winter month, for which purpose aqueous acid solution is circulated through a circuit, whereupon volume, temperature, concentration of solution, and amount of acetic acid in natural form and 100% form are determined. When indicated concentration is exceeded in storehouse, required amount of water is added while circulating solution to achieve desired concentration. Further, aqueous acetic acid solution is pumped out into transportation container. After transportation, solution is pumped into shop container, wherein above-listed parameters are redetermined and presence or absence of solid phase in the storehouse is checked. In case of equality of concentrations in shop container and in storehouse, there is lack of solid phase in the storehouse. When concentration in shop container is less than in storehouse, solid phase is available in storehouse and then, for next admittance, calculated amount of water is introduced into storehouse with circulation through circuit to obtain average acid concentration in storehouse, at which crystallization temperature of solution is the same as average temperature in storehouse for a given winter month. At subsequent withdrawal of aqueous acetic acid solution from storehouse all the operations are repeated.
EFFECT: enabled storage of aqueous acetic acid solutions during winter period without need of warming.
1 dwg, 2 ex
FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to a method for preparing acetic acid solution. Method involves the following procedures. Capacity with the parent raw is filled with water in the amount providing preparing acetic acid semihydrate and then water is poured in another capacity in the amount providing preparing 72-80% of acetic acid solution from semihydrate prepared in the first capacity. Then semihydrate is pumped off from the first capacity to the second one in the amount to obtain 17-50% acetic acid solution and prepared solution is stirred for 5-7 min. Sample is taken for control of mass part of acetic acid in the range 17-50%. Semihydrate is pumped off from the first capacity in the second one again under layer of liquid up to its filling and bottom layer of solution is stirred for 1-5 min. Sample is taken from the top layer for control of mass part of acetic acid in the range 17-50% and from the bottom layer in the range 72-80%. Then the bottom layer is pumped off in the amount equal to the amount of semihydrate charged at the second step. Method provides reducing fire hazard of technological process and diminishing concentration of acetic acid vapors in air of working zone.
EFFECT: improved method for preparing.
2 tbl, 1 dwg, 4 ex
FIELD: chemical technology.
SUBSTANCE: invention relates to a method for removing higher organic iodides from organic media. Method for removing organic iodides containing 10-16 carbon atoms from non-aqueous organic media containing organic iodides with 10-16 carbon atoms is carried out by contacting indicated organic media with silver- or mercury-exchange cationic, ion-exchange substrate at temperature from 50°C to 150°C. Invention proposes a method for removing iodides having 10-16 carbon atoms from acetic acid or acetic anhydride by providing flow of acetic acid or acetic anhydride containing organic iodide having 10-16 carbon atoms. Indicated flow is contacted with macroporous strong acid ion-exchange resin wherein at least 1% of active sites acquire form of silver or mercury at temperature in the range 50°C - 150°C. Indicated silver- or mercury-exchange ion-exchange resin removes effectively at least 90 wt.-% of indicated organic iodides from indicated flow of ready acetic acid or acetic anhydride. Also, invention proposes a method for removing organic iodides containing 10-16 carbon atoms from acetic acid or acetic anhydride involving contact of acetic acid or acetic anhydride comprising dodecyl iodide with silver- or mercury-exchange cationic ion-exchange substrate at temperature in the range 50°C - 150°C. Method provides the complete removing higher organic iodides from flow of acetic acid and/or acetic anhydride.
EFFECT: improved method for removing.
29 cl, 5 dwg, 13 ex
FIELD: food-processing industry and other branches of industry where hot liquid is to be bottled into container made from material having softening point below temperature of bottled liquid.
SUBSTANCE: method involves cooling outer surface of bottle, made from material having softening point below temperature of liquid to be bottled, by providing circulation of coolant before, during and after bottling in heat-exchanger placed in closed hydraulic circuit having outlines coinciding with contour of horizontal single-level bottling and capping circuit for creating conditions of equalizing velocities of bottles to be filled and flow velocity of circulating coolant.
EFFECT: simplified bottling process, reduced costs and provision for keeping high biological purity of bottled beverage.
3 cl, 5 dwg
FIELD: food industry, particularly semi-automatic device for pouring beer and other foamed oxygen-sensitive beverages in plastic bottles from constant-pressure vessels under backpressure and sealing above bottles.
SUBSTANCE: device comprises table, horizontal rotary carrousel arranged on the table and mounted on vertical post. The carrousel is provided with holes for plastic bottle receiving, which retain plastic bottle necks. The device also has sealing unit, pouring unit with heads adapted to supply beverage under backpressure in plastic bottles and control unit provided with pneumatic system and control panel. The pouring unit is connected with constant-pressure vessel by pipelines. The device also has upper and lower sliding cross-bars formed as plates with guiding bushes arranged on the table from opposite sides thereof and secured to vertical post above rotary carousel, wherein the bushes are arranged at different vertical post heights and have drives for vertical displacement thereof along vertical post. Pouring unit is installed on upper sliding cross-bar. Sealing unit is connected to lower cross-arm. Bottle receiving holes are arranged on rotary carrousel under pouring unit and sealing unit. Pouring unit heads are provided with filling tubes.
EFFECT: increased output, reduced time of beverage contact with oxygen during bottle filling and sealing.
5 cl, 5 dwg