Mineral tanning agent based on zirconium compounds

 

(57) Abstract:

Mineral tanning agent can be used for tanning leather and fur skins. Mineral tanning agent contains the basic zirconium carbonate and acetic acid. Proposed mineral tanning agent allows you to extend the range of tannins on the basis of zirconium, improving the efficiency of tanning while reducing its consumption and wastewater pollution. table 2.

The invention relates to light industry and can be used for tanning leather and fur skins.

Known mineral tanning agent based on the sulfate of zirconium /Zirconium tanning/ (A. I. Metelkin, N. And.Kolesnikova, E. C. Kuzmin. -M: light sensor, 1972, S. 22-32). Sulfate of zirconium when dissolved in water form a poorly soluble basic zirconium sulfate, the pH of the solution is low, consequently the effectiveness of tanning is also low.

Also known mineral tanning agent based on the basic zirconium carbonate (Metelkin, A. I. and other Zirconium tanning. -M: light sensor, 1972, S. 37-39). As a basic zirconium carbonate is insoluble in water, its use in the tanning process requires translation into a soluble state by applying mineral the tanning properties of selftolerance sodium.

Thus the basis of the invention is to create such a mineral tanning agent based on the basic zirconium carbonate, which is due to the introduction of an additional component would provide the optimal pH of the tanning solution is 3.8 to 4.8, which has expanded the range of tannins on the basis of zirconium, improving the efficiency of tanning while reducing consumption and reducing wastewater pollution.

This object is achieved in that the mineral tanning agent based on the basic zirconium carbonate, according to the invention, further comprises acetic acid in the following ratio, wt.%: the basic zirconium carbonate 60-76, acetic acid 24-40.

The basic zirconium carbonate and the influence of acetic acid, contributing to the dissolution of the basic zirconium carbonate in the water when the claimed parameters of these components helps to ensure that the pH of an aqueous solution of a tanning agent is 3.8 and 4.8, in which there is a high uptake of zirconium to promote optimum conditions tanned, thanks to assortment of tanning agent based on zirconium compounds, contributing to eye in the ratio of acetic acid lowers the pH of the solution of a tanning agent. Given that one of the advantages of using native carbonate of zirconium for tanning in comparison with the prototype is the optimal pH environment for tanning, the creation of tanning agent with a pH below to 3.8, which is achieved when the content of acetic acid of 40% is inappropriate. In addition, the excess acid, the introduction of tanning in the semi-finished product must be neutralized by adjusting the pH. Decrease acid in the tanning agent below 24% leads to a decrease in the solubility of the basic zirconium carbonate, which leads to high residual content of zirconium in the waste liquid.

Mineral tanning agent based on the basic zirconium carbonate obtained as follows. In a reactor equipped with a stirrer, placed 20-40 wt.% concentrated acetic acid and 60-76 wt.% the basic zirconium carbonate grade CSS-1 or CSS-2 /TU 48-4-268-73/. The mixture is stirred at a temperature of 18-20oC until complete dissolution of the basic zirconium carbonate within 2-6 hours

Specific examples of the production of mineral tanning agent based on a basic carbonate, zirconium and its properties are presented in table.1.

As follows from the data given in table.1, the decrease in the ratio of acetic acid and increase Bosnia in soluble condition /solution becomes transparent/. With the increase in the ratio of acetic acid decreases the pH of the solution of a tanning agent.

To reduce foaming in the process of obtaining mineral tanning agent into the reactor, it is advisable to add an antifoam.

The hide, sheepskin, resulting technology /Method of production of chrome-tanned leather, sheepskin. - M.: Milligram USSR, 1981, 25 C./ had been tanning for 5 hours on hours worked pikelner solution at the LCD 1 and the temperature of 202oC. For tanning claimed mineral tanning agent the hide was Pikalevo within 2 h by composition, wt.% by weight of the hide: sodium chloride - 5, sulfuric acid is 0.7. Consumption of tanning agent on the basis of the basic zirconium carbonate in the calculation of the zirconium oxide /IV/ was 2.5% by weight of the hide, all of the examples.

The influence of the composition of the inventive mineral tanning material at the temperature of the welding, which evaluated the effect of tanning, are presented in table.2.

With increasing amounts of acetic acid in the composition of the tanning agent increases the neutralizing alkali reagent /sample 7/, which is undesirable.

Mineral tanning agent based on the basic zirconium carbonate has a slight solubility in water and has a pH of 3.8 to 4.8, which is Opti the process of tanning at the optimum pH and reduced the consumption of mineral tanning agent, to achieve complete its development, to reduce the consumption of neutralizing substances and to reduce pollution of groundwater.

Mineral tanning agent based on the basic zirconium carbonate, characterized in that it further comprises acetic acid in the following ratio, wt.%:

The basic zirconium carbonate - 60 - 76

Acetic acid - 24 - 40o

 

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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

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