Method for syntan production

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.

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The invention relates to the technology for synthetic tanning agent (sintanol)used in leather production.

A method of obtaining Besfamilnov Santana 1M, representing dispersed in the concentrate sulfite-yeast dregs product deep two-step polycondensation of dioxideemissions and formaldehyde. [Levenko P.I. Influence of chemicals to increase production efficiency and quality leather. - M: Light industry, 1979, s].

The disadvantage of this method is that the source reagent dioxideemissions is scarce, expensive and environmentally hazardous, which is currently the industry is not available.

Closest to the claimed is a method of producing sintana DFPM-2 by sulfotyrosine and condensation of diphenylolpropane with formaldehyde, followed by acidification of the product with sulfuric acid and additional precondensation urea and dispersing the resulting product in the lignosulfonates [RF Patent N2041954, CL 14 With 3/00, bull. N23, 1995].

The disadvantage of this method is the complexity of the process, its duration, and excretion of ammonia by precondensation urea, which is released into the atmosphere, thereby poisoning her. The use of urea in the process of tanning makes the skin color fastness, which is ri the use of lignosulfonate dark brown color fading.

The objective of the invention is simplification and expansion of the range used lignosulfonate.

The technical result is the achievement of a stable number of tanning agents in sintang, improving the environment and increasing the efficiency of the process.

This object is achieved in that in the method of producing sintana by sulfotyrosine and condensation of diphenylolpropane with formaldehyde, followed by acidification of the product with sulfuric acid, the dispersion of the product obtained after acidification, the lignosulfonate peculiarity lies in the fact that the dispersion of the product obtained after acidification, use the lignosulfonate containing 0.5 to 1.5% of aluminum sulfate in terms of aluminum oxide.

Lignosulfonates produced by the pulp and paper industry, have different contents tanning substances - from 33 to 40% depending on the method of cooking the cellulose and composition of the treated wood. The use of any of the lignosulfonates in the process of dispersion is achieved by the introduction of 0.5-1.5% of aluminum sulfate in terms of aluminum oxide. The presence of aluminum ions increases the number of tanning agents in sintang, accelerates the penetration of the tannins in the skin, increases the temperature of the welding of the skin.

Due to the exclusion from the process of obtaining Santana study the additional precondensation urea process is simplified, shortens its duration, prevents the emission of ammonia into the atmosphere, increasing the efficiency of the process.

The method is as follows.

To obtain Santana DFPM-2 reactor fill in 1000 l of water, then load 1000 kg of diphenylolpropane and 460 kg of sodium sulfite. The mixture is heated to 65°With constant stirring for 1 hour. In the resulting mass is added to 20.5-21% solution of formaldehyde on the weight of diphenylolpropane. Then the mass is heated to 96°and incubated for 4-5 hours to obtain a water-soluble product. Ready condensed mass is then cooled to 65°and then acidified with it by adding a 15%sulfuric acid to obtain a pH of 3.0 to 4.0. Further, the product obtained after acidification, is dispersed in the lignosulfonate or lignosulfonate containing 0.5 to 1.5% of aluminum sulfate in terms of aluminum oxide.

The dispersion in the lignosulfonates.

In the product obtained after acidification, load 5000 kg lignosulfonate, pre-heated to 40-50°C. the Mixture is heated to 90°C and maintained at this temperature for 2-3 hours. The obtained liquid Syntan dried in evaporators.

The dispersion in the lignosulfonate containing 0.5 to 1.5% of aluminum sulfate in terms of aluminum oxide.

In the product obtained after acidification, load 5000 kg lignosulfonate, pre is varicella heated to 40-50° With, then add 0.5 to 1.5% of aluminum sulfate in terms of aluminum oxide. The mixture is heated to 90°C and maintained at this temperature for 2-3 hours. The obtained liquid Syntan dried in evaporators.

Received Syntan DFPM-2 has good dispersing properties and can be combined with other synthetic and vegetable tanning agent, well fills chrome semi-finished product from raw materials of cattle. It is recommended as a self-tanning agent in the production of hard leather, Russian leather. The proposed technical solution is easy to implement in a production environment.

The method of obtaining sintana by sulfotyrosine and condensation of diphenylolpropane with formaldehyde, followed by acidification of the product with sulfuric acid, the dispersion of the product obtained after acidification, lignosulfonates, characterized in that the dispersion of the product obtained after acidification, use the lignosulfonate containing 0.5 to 1.5% of aluminum sulfate in terms of aluminum oxide.



 

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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.

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