The method of obtaining titanium tanning agent of such raw materials with harmful tanning impurities and the method of manufacture of leather

 

(57) Abstract:

Usage: in the leather industry. The essence of the invention: titanium containing raw materials with harmful tanning components are pre economicly processing mode boil at T:W=1:2-6 translation of titanium in the sediment. The residue is treated with sulphuric acid generated translation titanylsulphate in sulfuric acid solution at a content in excess in relation to the titanylsulphate sulfuric acid equal to 50-300 g/DM3. In the resulting solution is injected ammonium sulfate in two stages with intermediate exposure for 0.5-2.5 hours and the completion of the first stage with the beginning of the deposition of amenitiesinclude, and the second stage at a concentration in solution of excess ammonium sulfate, equal 150-500 g/DM3. Received the tanning agent used in the formulation of skin with increasing pH of the bath to 3.7 and 4.3 after titanium tanning is injected into the tanning bath soluble sodium-potassium aluminosilicate with the consumption of its 8-25% in relation to amenitiesinclude taken for tanning. The implementation of neutralization leather semi-finished product before it podobruanje synthetic tanning agent to a pH of 4.0 to 5.0. An increase in pH of the bath p is led soluble sodium-potassium aluminum silicate in its consumption of 1.7 to 4.7% by weight of the hide. Conforming titanium tanning agent obtained from raw material, which is harmful for the tanning of impurity components, due to more complete separation and synthesis of crystalline tanning agent. 2 S. and 3 C.p. f-crystals.

The invention relates to methods for mineral tanning agent, namely the method of obtaining titanium tanning agent of such raw materials with harmful tanning impurity components, and its application in the development of the skin.

In the production of leather, along with plant, widely used mineral tanning agent: compounds of chromium, zirconium, aluminum.

It is known that compounds of titanium also have tanning properties. Such titanium compounds are the salts thereof, of which the most preferred ammunitionsolid (NH4)2TiO(SO4)2H2O.

A method of obtaining titanium tanning agent, which such raw material is subjected to sulfuric acid treatment followed by titanium in solution, which is precipitated by introducing ammonium sulfate and sulfuric acid ammunitionsolid in monohydrate form (NH4)2TiO(SO4)2H2O, stabilized promivka is for tanning impurity components.

The known method of applying the compounds of titanium in the production of leather for tanning obezzolennogo and pickled, obezzolennogo, pickled and chrome-plated hide [2]

However, the resulting skin have a high enough quality indicators.

Also known is a method of obtaining titanium tanning agent from telangiectasias raw materials, including sulfuric acid processing of raw materials, leaching SPECA water with translation of titanium in solution, which is injected oxidant sulfate solution peroxidation complex followed by the addition of ammonium sulfate and sulfuric acid and deposition of amenitiesinclude in monohydrate form (NH4)2TiO(SO4)2H2O and stabilize it by washing with a solution of ammonium sulfate, and the precipitation of the titanium salt to spend her education in the amount of 75-85% and then precipitated titanium salt is separated and washed, and the filtrate and wash water are combined and treated with ammonium sulfate to dosagee salt which is separated and returned to the original solution [3]

The disadvantage of this method is that it provides only clean from impurities of iron, without affecting Kuskovo product.

There is also known a method of manufacture of leather with the use of titanium tanning agent, which bassolino the pickling process activates the process of tanning substances, tanning activated the hide spend amenitiesalarm when the flow rate of 20-30% by weight of the hide, in the presence of complexes agent, followed by neutralization of leather material after draining the bath and sodium sulfite and urotropine in the amount of 3.5% each by weight of the hide to achieve a pH of prefabricated 4.0 to 4.5 and podobruanje semi synthetic tanning agent with subsequent filling and greasing [4]

The disadvantage of this method is that its implementation requires a large consumption of sodium sulfite and urotropine as neutralizing substances, the use of which is associated with toxic emissions: sulfur dioxide from sodium sulfite and formaldehyde from hexamine. Moreover, get skin have a high enough quality indicators.

The present invention is directed to solving the problem of obtaining the certified tanning agent of such raw materials with harmful tanning impurity components, due to more complete separation and obtain in the process krupnokristallichesky aimed at the solution of the problem of development of skin with the use of the obtained titanium tanning agent, exclusive use of toxicogenic substances sodium sulfite and urotropine, while improving the quality of the leather.

The solution of this problem is achieved by the fact that such raw materials with harmful tanning impurity components are pre azotnokislogo processing carried out at T:W 1:2-6, translation titanium in the sludge, which is treated with sulfuric acid, the resulting titanylsulphate transferred to sulfate solution at excessive in relation to the titanylsulphate the content of sulfuric acid, equal 50-300 g/DM3and in the resulting sulfuric acid solution is injected ammonium sulfate in two stages with intermediate exposure for 0.5-2.5 hours, with the first stage completed with the beginning of the deposition of amenitiesinclude, and the second stage leads to the concentration in solution of excess ammonium sulfate, equal 150-500 g/DM3.

The solution of this problem is achieved by the fact that the preliminary isotoxicity processing is done in the mode of boiling.

The solution of this problem in relation to the tanning of the skin is achieved in that in the method of manufacture of leathers, including processing obezzolennogo hide intensify the process of tanning substance, gubala in the presence of complexes agent, drain the bath, the neutralization of the semi-finished product and podobruanje its synthetic tanning agent with subsequent filling and creasing, according to the invention as tanning agent used tanning agent obtained under item 1, before draining tubs increase its pH to 3.7 and 4.3 by injecting soluble sodium-potassium silicate in the amount of 8-25% by weight of amenitiesinclude, and the neutralization of the prefabricated lead to pH of 4.0 to 5.0. An increase in pH of the bath is carried out for 2 to 10 hours at a temperature of 25-30oC, and the neutralization of the prefabricated lead acid-soluble sodium-potassium aluminum silicate in its consumption of 1.7 to 4.7% by weight of the hide.

The preliminary azotnokislogo processing of such raw materials in the process of obtaining titanium tanning agent allows you to select it in the solution is harmful for tanning impurity components and simultaneously translate the titanium from raw materials in the sediment. When processing this sludge sulfuric acid titanium is almost completely transferred to well soluble titanylsulphate. Properties of the resulting titanylsulphate will produce a solution with such a content of sulfuric acid, which in combination with the mode of introduction of ammonium sulfate in the resulting sulfate RA is abode skin application of acid-soluble sodium-potassium silicate to increase the pH of the bath after titanium tanning allows for simultaneous produblirovana semi sulfate-aluminium complex, the neutralization of the prefabricated acid-soluble sodium-potassium aluminum silicate leads to the filling of leather polysilicon acid, which in total provides the improvement of physico-mechanical properties of skin: wear resistance and hydrothermal resistance, reduces consumption and increases the fullness of the skin.

Preliminary azotnokislogo processing mode boil with respect to T W 1:2-6 due to the efficiency of the implementation process. At T W greater than 1:1 reaction mass is difficult to mixing and can cause seizure, T W less than 1:6 is impractical, as it causes inefficient use of equipment and does not increase the degree of removal in solution is harmful for tanning components. Lowering the temperature of the reaction mixture with nitric processing below the boiling point affects the translation of titanium from the titanium containing materials in the hydroxide sludge and reduces the degree of separation of harmful tanning impurity components.

When translating titanylsulphate in sulfuric acid solution content in excess of sulfuric acid is less than 50 g/DM3results in the salting out of solution amenitiesinclude to appear in suspense the th acid exceeding 300 g/DM3cause salting out of amenitiesinclude of such solutions in the form of unstable monohydrate form, which also degrades the quality of the tanning agent.

The purpose of the intermediate delay between stages of the introduction of ammonium sulfate consists in suppressing the formation of crystallization centers, while in the second stage of the introduction of ammonium sulfate occurs only growth formed in the first stage of the crystals.

The exposure time is less than 0.5 hours is not enough for the manifestation of this effect of suppressing the formation of crystallization centers. The exposure time 2.5 h impractical because of the lengthening process vysalivaniya of amenitiesinclude without the effect of the consolidation of crystals.

Interval attainable concentration in solution the excess of ammonium sulfate in the second stage of vysalivaniya due to the need to achieve a high degree of deposition of amenitiesinclude. At a concentration in solution of excess ammonium sulfate is less than 150 g/DM3the degree of deposition is low (less than 80%), and the concentration in solution of excess ammonium sulfate above 500 g/DM3does not lead to further increase in the rate of deposition of amenitiesinclude.

The process of increasing the pH of the bath with sodium-potassium aluminum silicate is at a certain speed and time is needed to achieve the desired effect. In less than 2 h sodium-potassium silicate does not have time to interact with tanning tub acid and remains in the form of sediment. The duration of the process of increasing the pH of the bath for more than 10 h impractical, as the process of interaction of sodium and potassium silicate with acid by this time a fully completed in terms of the accepted temperature range of 25-30oC. the Exit temperature leads to lower quality leather.

Consumption of sodium-potassium aluminosilicate 1.7 to 4.7 percent by weight of the hide, while neutralization of the semi-finished product due to the need to achieve a pH of semi-finished product in the range of 4.0 to 5.0 for subsequent tanning with synthetic tannins. Reducing consumption is about flow above the 4.7% by weight of the hide causes that sodium-potassium aluminosilicate does not dissolve completely and remains on the skin, compromising its quality.

According to the invention titanium tanning agent obtained as follows.

Such raw material is crushed to a particle size of 0,063 mm not less than 90% and treated with nitric acid at a concentration 36-58% during the boil with stirring. The duration of treatment and concentration of nitric acid depends on what kind of use of such raw materials. After azotnokislogo processing mass is then cooled and filtered. The solution is transferred into a significant part of the impurity components that are harmful for tanning: iron, rare earth elements, and in the sediment remains a Titan in the hydroxide form. The residue is subjected to acid treatment using concentrated acid. This processing is the temperature of the reaction mass, duration, concentration of acid, its consumption depends on what compound is used such raw materials. Mass after the sulfuric acid treatment is diluted with water and filtered. In the sediment remains unopened part of the raw material and the insoluble sulphate, and the solution passes the titanylsulphate. This solution is cooled and demi. The first stage is complete when the turbidity of the solution occurring at the beginning of the crystallization of amenitiesinclude, and the second stage is brought to a concentration in the solution is excessive in relation to amenitiesinclude of ammonium sulfate, which ensures the achievement of a high degree of vysalivaniya of amenitiesinclude.

Removing titanium from raw materials in ammunitionsolid is 78-85% Transition harmful for tanning impurity components from raw materials to the target product is less than 1%

Obtained by the above described method titanium tanning agent may be used in the formulation of skin. The method of tanning is as follows.

Bassolino the hide, obtained from raw materials of bovine butts, gatherings and other ) you can load into the dryer, pour water with a temperature of 23-26oC to liquid ratio of 1.2 to 1.3, and enter activates the process of tanning substance, for example, sodium salt desulfurization, in the amount of 1.5 to 2.5% by weight of the hide. Then carry out a titanium tanning, which is injected titanium tanning agent ammunitionsolid when the flow rate of 20 to 30% by weight of the hide (4 to 6% in terms of titanium dioxide and ammonium sulfate in the amount of 4 to 6% by weight of googletest titanium tanning agent, ammonium sulphate, activating substances and complexes agent depend on the density and thickness of the hide. The tanning process takes place within 18 20 PM

After titanium tanning in the drum type acid-soluble sodium-potassium silicate in the amount of 8 to 25% by weight used in the tanning of amenitiesinclude and the drum rotate for 2 to 10 hours at a bath temperature 25 30oC. the pH of the bath is increased from 1.7 to 2.2 to 3.7 to 4.3. Then the bath is drained and fresh tub, in a wet coefficient of from 1.2 to 1.4 carry out the neutralization of leather prefabricated acid-soluble sodium-potassium aluminum silicate in its consumption of 1.7 to 4.7% by weight of the hide until the pH of the semi-finished product equal to 4,0 5,0.

Then the semi-finished product is washed with water and podrublivajut synthetic tanning agent, taken in an amount from 15 to 17% tanning by weight of the hide when liquid ratio from 1.2 to 1.4, the temperature from 38 to 43oC for 48 to 60 hours as a synthetic tanning agent is used such tannins, which are stable in the acidic environment in the presence of ammonium sulfate solution. To reduce foaming when poddolovani simultaneously with the tanning agent is injected leather pasta or sulfated oils it is greased. For filling use magnesium sulfate and molasses in quantities from 5 to 10% each by weight of the hide. Greasing is carried out with application of solid synthetic fattening substances. Followed by finishing processes and operations.

The nature and advantages of the claimed invention can be illustrated by the following examples.

Obtaining titanium tanning agent

Example 1.

1000 kg of crushed (- 0,063 mm 95%) loparite concentrate containing TiO239,0, Fe2O30,9, oxides of rare earth elements 32,0, fill in 1.0 m3water, stirred and heated to 90oC, then add 0.7 m372% of nitric acid (d 1.42 kg/DM3), the concentration of HNO3in a solution of 36% T W 1 2. The suspension is heated to 108 110oC and incubated with stirring for 48 h, after which it is cooled to 60oC, diluted, and injected 1.2 m3water, filtered and the precipitate repulping water to a residual content in the leaching solution of oxides of rare earth elements is not more than 1 g/DM3.

Get 880 kg sludge with a moisture content of 32% containing calculated on the dry product, TiO265,2, Fe2O30,15, oxides of rare earth elements 0,35.

Poluchenii under stirring 1,16 m3concentrated sulfuric acid (d 1,83 kg/DM3),/ heated to 80oWith a Lot incubated with stirring for 1.5 h, after which it is cooled, diluted by adding 3.6 m3water, kept under stirring at 60oC for 1 h and filtered.

Get 5,06 m3solution containing, g/DM3: TiO273,8, H2SO4391, Fe2O30,18, oxides of rare earth elements 0,40. The content is excessive in relation to the titanylsulphate sulfuric acid equal to 300 g/DM3.

To the resulting solution was cooled to 23 of the 27oC add with stirring 550 kg of ammonium sulfate and then portions of 15 kg over 3 minutes of entering another 140 kg of ammonium sulfate.

The solution becomes cloudy and adding ammonium sulfate suspended, the suspension is incubated under stirring for 0.5 h, after which the supply of ammonium sulfate resume portions 30 kg over 2 min and injected 690 kg to the concentration in solution of excess ammonium sulfate, 150 g/DM3.

After the introduction of ammonium sulfate suspension is stirred for 1 h, then filtered. You get a 5.1 m3the filtrate, containing, g/DM3: TiO28, H2SO4310, (KTA titanium tanning agent.

The crystal size of the product is in the range of 0.10 to 0.15 mm, the tanning agent Obtained has the following composition, TiO221,3, (NH4)2O 14,7, H2SO429,0, Fe2O30,02, oxides of rare earth elements is 0.01.

The output of amenitiesinclude from the solution under vysalivaniya is 88.4% of

Example 2.

1000 kg of crushed (-0,063 mm 95%) loparite concentrate containing TiO239,0, Fe2O30,9, oxides of rare earth elements 32,0, pour 1.1 m3water, stirred and heated to 90oC, then add 3.3 m372% of nitric acid (d 1.42 kg/DM3), the concentration of HNO3in a solution of 58% T W 1 6. The suspension is heated to 115 118oC and incubated with stirring for 48 h, after which it is cooled to 60oC, diluted with water, introducing 2.0 m3, filtered and the precipitate repulping water to a residual content in the leaching solution of oxides of rare earth elements is not more than 1 g/DM3.

Get 830 kg sludge with a moisture content of 28% containing calculated on the dry product, TiO264,6, Fe2O30,13, oxides of rare earth elements 0,30.

The obtained wet sediment load concentrated in Serna stand under stirring for 0.5 h and allowed to ripen for 1 h, then cool. Spec leached with the addition of 8.8 m3water, kept under stirring at 60oC for 1 h, after which the suspension is filtered.

Get 9.8 m3solution containing, g/DM3: TiO2- 39,0, H2SO498, Fe2O30,08, oxides of rare earth elements of 0.18. The content is excessive in relation to the titanylsulphate sulfuric acid is 50 g/DM3.

To the resulting solution was cooled to 25oC add with stirring 560 kg of ammonium sulfate and then portions of 15 kg over 3 minutes of entering another 160 kg of ammonium sulfate. The solution becomes cloudy and adding ammonium sulfate suspended, the suspension is incubated under stirring for 2.5 hours After which the supply of ammonium sulfate resume portions 60 kg over 2 min and injected 4890 kg to the concentration in solution of excess ammonium sulfate equal to 500 g/DM3.

After the introduction of ammonium sulfate suspension is stirred for 1 h, then filtered. You get to 10.3 m3the filtrate, containing, g/DM3: TiO25, H2SO456, (NH4)2SO4510, Fe2O30,06, oxides of rare earth elements of 0.11, and 1540 kg of the desired product Titus who meet the following composition, TiO221,5, (NH4)2O 15,9, H2SO429,0, Fe2O30,01, oxides of rare earth elements of 0.005.

The output of the titanium salt solution under vysalivaniya is 86.6%

Example 3.

1000 kg of crushed (-0,063 mm 95%) loparite concentrate, containing, TiiO239,0, Fe2O30,9, oxides of rare earth elements 32,0, pour 1.4 m3water, stirred and heated to 90oC, then add 1.8 m372% of nitric acid (d 1.42 kg/DM3), the concentration of HNO3in the solution, 46% T W 1 4. The suspension is heated to 110 112oC and incubated with stirring for 48 h, after which it is cooled to 60oWith diluted by introducing 2 m3water, filtered and the precipitate repulping water to a residual content in the leaching solution of oxides of rare earth elements is not more than 1 g/DM3.

Receive 854 kg sludge with a moisture content of 30% containing calculated on the dry product, TiO264,0, Fe2O30,15, oxides of rare earth elements 0,35.

The obtained wet sediment load in concentrated sulfuric acid (d 1,83 kg/DM3), preheated to 90oC. the Amount of acid is 0,88 m3. A lot widelane 5,3 m3water, kept under stirring at 60oC for 1 h, after which the suspension is filtered.

Get 6,67 m3solution containing, g/DM3: TiO257,3, H2SO422,0, Fe2O30,14, oxides of rare earth elements of 0.13. The content is excessive in relation to the titanylsulphate sulfuric acid equal to 150 g/DM3.

To the resulting solution was cooled to 25oC add with stirring 560 kg of ammonium sulfate and then portions of 15 kg over 3 minutes of entering another 150 kg of ammonium sulfate.

The solution becomes cloudy and adding ammonium sulfate suspended, the suspension is incubated under stirring for 1.5 hours After which the supply of ammonium sulfate resume portions 60 kg over 2 min and injected 2265 kg to the concentration in solution of excess ammonium sulfate equal to 350 g/DM3.

After the introduction of ammonium sulfate suspension is stirred for 1 h, then filtered. You get a 6.7 m3the filtrate, containing, g/DM3: Tio26, H2SO4157, (NH4)2SO 4360, Fe2O30,11, oxides of rare earth elements between 0.30 and 1550 kg of the desired product titanium tanning agent.

The size of the crystals (NH4)2O 15,2, H2SO429,3, Fe2O30,01, oxides of rare earth elements 0,007.

The output of the titanium salt solution under vysalivaniya is 87,6%

Example 4.

1000 Kg of crushed (-0,063 mm 90%) perovskitelike concentrate containing TiO250,0 Fe2O33,0, oxides of rare earth elements 3,7, fill in 1.0 m3water, stirred and heated to 90oC, then add 1.75 m372% of nitric acid (d 1.42 kg/DM3), the concentration of HNO3in solution 51% T W 1 to 3.5. The suspension is heated to 113 116oC and kept under stirring for 24 h, after which it is cooled to 60oC, diluted by introducing 1.5 m3water, filtered and the precipitate repulping water to a residual content in the leaching solution of oxides of rare earth elements 0,2.

The obtained wet sediment Rasulova. The mass is heated to 90oC and poured thereto with stirring 1.0 m3concentrated sulfuric acid (d 1,83 kg/DM3), heated to 95oC. the Mass is maintained with stirring for 3.0 hours, after which it is cooled, diluted by adding 4.5 m3water, kept under stirring at 60oC for 0.5 h and the filter is 2O30,7, oxides of rare earth elements is 0.2. The content is excessive in relation to the titanylsulphate sulfuric acid equal to 300 g/DM3.

To the resulting solution was cooled to 25oC add with stirring 600 kg of ammonium sulfate and then portions of 15 kg in 3 min introduce 290 kg of ammonium sulfate. Thus the solution becomes cloudy and adding ammonium sulfate to stop, the suspension is incubated under stirring for 1 h, after which the supply of ammonium sulphate continue portions 30 kg in 3 min and injected 1710 kg to the concentration in solution of excess ammonium sulfate equal to 300 g/DM3.

The suspension is filtered, you get a 6.1 m3the filtrate, containing, g/DM3: TiO2-5, H2SO4306, (NH4)2308, Fe2O30,6, oxides of rare earth elements 0.2 and 2090 kg of the desired product titanium tanning agent.

The crystal size of the product is in the range of 0.10 to 0.20 mm

Received the tanning agent has the following composition: TiO221,5, (NH4)2O 15,0 H2SO429,0, Fe2O3- 0,01, oxides of rare earth elements of 0.005.

The output of amenitiesinclude from the solution under vysalivaniya is 93,6%

Calculat in sustainable monohydrate form (NH4)2TiO(SO4)2H2O, containing no harmful for tanning leather impurity components of iron and rare earth components, presented in the form of a crystalline product with a crystal size in the range of 0.10 to 0.25 mm

The production of leather using titanium tanning agent.

Example 5.

Bassolino the hide, from raw materials in cattle (butts) are loaded into the drum, pour water with a temperature of 25oC to liquid ratio equal to 1.2, and enter the sodium salt desulfonation in the amount of 2.0% by weight of the hide. The drum rotates 1.5 h, then injected titanium tanning agent ammunitionsolid obtained according to example 3, in the amount of 30% by weight of the hide (6% based on titanium dioxide), the ammonium sulfate in the amount of 6% by weight of the hide, and lactic acid in its consumption of 1.2% by weight of the hide.

The tanning process is continued for 20 h with continuous rotation of the drum. Then, in the drum type at once dry collaterally sodium-potassium silicate in the amount of 25% by weight used in the tanning of amenitiesinclude (to 7.5% by weight of the hide) and the drum rotate for 10 hours pH van is the realizations of leather prefabricated acid-soluble sodium-potassium aluminum silicate when the flow rate of 4.7% by weight of the hide until the semi-finished product pH 5.0.

Next, semi-finished leather is washed with water and podrublivajut synthetic tanning agent, taken in an amount of 17% tanning by weight of the hide, when liquid ratio of 1.4, the temperature of the 40oC for 48 hours Then semi-finished leather is washed, drained, filled, and it is greased. For filling use of magnesium sulfate in an amount of 5% molasses in the amount of 8% of Greasing is carried out with the use of solid synthetic fattening substances. This is followed by the finishing processes and operations.

The indicators obtained leathers following: the volumetric output of 105.5% of the wear resistance in dry conditions 215 cycles/mm, the moisture resistance for two hours 43%

Example 6.

Bassolino the hide produced from raw materials of bovine gatherings), load in the drum, pour water with a temperature of 30oC to liquid ratio equal to 3, and spend titanium tanning under the conditions described in example 5, at a flow rate of amenitiesinclude obtained according to example 2, in the amount of 20% by weight of the hide for 18 hours Then into the bowl add in one scoop in dry form soluble sodium-potassium silicate in the amount of 8% by weight used in the tanning of amenitiesinclude (1,6% by weight of the hide) Etnom the ratio of 1.4 carry out the neutralization of leather prefabricated acid-soluble sodium-potassium aluminum silicate when the flow rate of 1.7% by weight of the hide until the semi-finished product pH of 4.0.

Further processing of semi-finished leather is made under the conditions described in example 5. Indicators of skin similar to that shown in example 5.

Example 7.

The processing of the hide and titanium tanning carried out as in example 5 except that the acid-soluble sodium-potassium silicate is added in the amount of 15% by weight used in the tanning of amenitiesinclude obtained in example 3 (4.5% of the weight of the hide) and the drum rotate within 6 hours the pH of the bath is increased from 2.0 to 4.0. The tub is drained and fresh tub when liquid ratio 1.3 conduct neutralization of leather prefabricated acid-soluble sodium-potassium aluminum silicate when the flow rate of 3.2% by weight of the hide until the semi-finished product pH 4.5.

Further processing of semi-finished leather is made under the conditions described in example 5. Indicators of skin similar to that shown in example 5.

Skin, produced with the use of titanium tanning agent obtained in examples 1 to 3 have the following physico-mehanicheskij indicators:

tear resistance 27 32 MPa,

lengthening 13 14%

wear resistance (abrasion resistance):

in dry conditions, the th 92 100%

In addition, skin, produced using titanium tanning agent obtained according to this invention, with the introduction to increase the pH of the tanning bath and for neutralization of leather prefabricated acid-soluble sodium-potassium aluminosilicate, characterized by increased fullness, water resistance, photostatically, resistance to moulding. They can be stored long-term without changing its characteristics.

1. The method of obtaining titanium tanning agent of such raw materials with harmful tanning impurities, including processing of raw materials with sulfuric acid, the translation produced titanylsulphate in sulfuric acid solution and introducing the resulting solution of ammonium sulfate with the deposition of amenitiesinclude in sustainable monohydrate form, characterized in that the titanium containing raw materials before processing with sulfuric acid, is subjected to acid treatment with respect to T W 1 2 6 translation of titanium in the sludge, which is treated with sulfuric acid, the translation titanylsulphate in sulfuric acid solution are excessive in relation to the titanylsulphate the content of sulfuric acid of 50 to 300 g/DM3and the introduction of ammonium sulfate in the resulting sulfuric acid solution is performed in two citycarshare, and the second lead to the concentration in solution of excess ammonium sulfate equal to 150 to 500 g/DM3.

2. The method according to p. 1, characterized in that the nitric acid treatment is carried out in the boiling mode.

3. The way we produce leather, which includes processing obezzolennogo hide intensify the process of tanning substances, tanning activated pickling titanium tanning agent in the form of amenitiesinclude when the flow rate of 20 to 30% by weight of the hide, in the presence of complexes agent, draining the bath, the neutralization of the semi-finished product and podobruanje its synthetic tanning agent with subsequent filling and creasing, characterized in that as the tanning agent used ammunitionsolid obtained under item 1, before draining the bath pH increase to 3.7 to 4.3 by injecting soluble sodium-potassium silicate in the amount of 8 to 25% by weight of amenitiesinclude, and neutralization of the prefabricated lead to pH=4 5.

4. The method according to p. 3, characterized in that the increase of pH of the bath is carried out for 2 to 10 hours at 25 30oC.

5. The method according to PP.3 and 4, characterized in that the neutralization of the prefabricated lead acid-soluble sodium-potassium aluminum silicate at a flow rate of 1.7 to 4.7% by weight of the hide.

 

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FIELD: coal-chemical products.

SUBSTANCE: weathered vitrinite brown coals from Baga-Nursk coal field having ash level 36-48% and moisture 20% are ground to granule size 0.5-0.9 mm. Resulting powder us sulfurized for 6-8 h with 98% sulfuric acid at 60-80°С and coal-to-acid weight ratio from 1:3 to 2:3. Sulfurized coal is neutralized and treated with 10-15% sodium hydroxide aqueous solution at weight ratio of alkali solution to initial coal (10-15):1 to form water-soluble sodium sulfohumate, after which water-soluble residual coal is separated by centrifugation. Centrifugate is mixed with 10-15% aqueous hydrochloric acid at volume ratio (10-15):6 to form precipitate, which is allowed to settle into compact form during 40-60 min. After decantation of liquid phase, solid residue is partially dried at 40-60°С until pasty mass is obtained.

EFFECT: increased content of tanning substances in humate-containing compounds and enabled utilization of oxidized brown coal in open-cut production of brown coals.

4 tbl, 5 ex

FIELD: coal-chemical products.

SUBSTANCE: weathered vitrinite brown coals from Baga-Nursk coal field having ash level 36-48% and moisture 20% are ground to granule size 0.5-0.9 mm. Resulting powder us sulfurized for 6-8 h with 98% sulfuric acid at 60-80°С and coal-to-acid weight ratio from 1:3 to 2:3. Sulfurized coal is neutralized and treated with 10-15% sodium hydroxide aqueous solution at weight ratio of alkali solution to initial coal (10-15):1 to form water-soluble sodium sulfohumate, after which water-soluble residual coal is separated by centrifugation. Centrifugate is mixed with 10-15% aqueous hydrochloric acid at volume ratio (10-15):6 to form precipitate, which is allowed to settle into compact form during 40-60 min. After decantation of liquid phase, solid residue is partially dried at 40-60°С until pasty mass is obtained.

EFFECT: increased content of tanning substances in humate-containing compounds and enabled utilization of oxidized brown coal in open-cut production of brown coals.

4 tbl, 5 ex

FIELD: tannery industry, in particular method for syntan (synthetic tanning material) production.

SUBSTANCE: claimed method includes diphenolepropane sulgation and condensation with formaldehyde followed by acidifying with sulfuric acid. Formed product is dispersed in lignosulfates containing 0.5-1.5 % of aluminum sulfate as calculated to aluminum oxide.

EFFECT: syntans with stable content of tanned materials: environmentally friendly and economical process.

1 ex

FIELD: tannery industry, in particular method for syntan (synthetic tanning material) production.

SUBSTANCE: claimed method includes diphenolepropane sulgation and condensation with formaldehyde followed by acidifying with sulfuric acid. Formed product is dispersed in lignosulfates containing 0.5-1.5 % of aluminum sulfate as calculated to aluminum oxide.

EFFECT: syntans with stable content of tanned materials: environmentally friendly and economical process.

1 ex

FIELD: tannery industry, in particular method for syntan (synthetic tanning material) production.

SUBSTANCE: claimed method includes diphenolepropane sulgation and condensation with formaldehyde followed by acidifying with sulfuric acid. Formed product is dispersed in lignosulfates containing 0.5-1.5 % of aluminum sulfate as calculated to aluminum oxide.

EFFECT: syntans with stable content of tanned materials: environmentally friendly and economical process.

1 ex

FIELD: light industry.

SUBSTANCE: invention relates to a method for treatment of fur hides before oxidative whitening of hair cover. Additional tanning and pickling are carried out separately at pH value 6.5-7.0. The preparation based on low-molecular alcohol polyacetals - "Dubitel M" is used as a tanning agent. Tanning agent is added for two steps wherein at the second step tanning agent is added in twice dose as compared at the first step. Additional tanning is carried out in the required ratio of components of an aqueous composition comprising sodium chloride, surface-active substance, preparation based on low-molecular alcohol polyacetals. Pickling is carried out with smearing on hair cover in the consumption 2-4 ml per 1 dm2 with the composition comprising iron sulfate, citric acid, surface-active substance and gelatin as a protecting additive. After pickling lying is carried out for 12-16 h. Method provides improved the quality of whitened fur hides.

EFFECT: improved method for treatment.

2 cl, 2 tbl

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