The method of production of synthetic tanning agent

 

(57) Abstract:

The method relates to a process for the production of synthetic tanning agent (sintanol) used in tanneries. Synthetic tanning agent are jointly condensation of synthetic phenol, formalin with lignosulfonate, followed by dispersing the obtained resin in the same lignosulfonate. Condensation is subjected to synthetic phenol in the presence of 15% sulfuric acid, the mixture was stirred at 40-45oC for 30 minutes Then serve formaldehyde at a temperature of 40-45oAt the rate of 4-5 l/min and at a temperature of 95-100oTo the reaction mixture was kept under stirring until there is no free formaldehyde. The resulting phenol-formaldehyde resin is dispersed in a heated up to 50-60oWith the lignosulfonate, the mixture was stirred at 95-100oC for 3-4 h until the pH of the finished product, equal to 3.5 to 4.5. The use of synthetic tanning agent will expand the range of the used tanning agent, to replace one of the components of the condensation of a phenol, included in thermal processing of oil shale, synthetic phenol than reduced the price process and excluded from it are extremely active shale phenols, as well as the synth is P> The invention relates to the technology for synthetic tanning agent (sintanol) used in tanneries.

A method of obtaining synthetic tanning agent for white skin (for example, sintana PCA) by condensation and sulfonation of phenol raw material. [Levenko P. I. Influence of chemicals to increase production efficiency and quality leather. - M: Light industry, 1979. - S. 104-105, 109].

Thus obtained synthetic tanning agent has the disadvantage that the instability indicator of the quality of the tanning agent due to the changing composition of phenolic materials.

Closest to the claimed method is synthetic tanning agent from phenols that are included with water thermal processing of oil shale-based joint condensation of these phenols with formaldehyde and lignosulfonic acids; the resulting resin constituting the amorphous mass of Golden color, dispersed in the same lignosulphonic acids, which are used for manufacturing lignieresii resin. [Mikhailov A. N. and other Synthetic tannins, M.: Light industry, 1967. - S. 133].

The disadvantage of this method is the use of expensive, e the phenols, as well as a narrow range of used synthetic tanning agent.

The objective of the invention is the expansion of the range of the used synthetic tanning agent, a cheaper process and improving the quality of the tanning agent.

This object is achieved in that the synthetic tanning agent are jointly condensation of synthetic phenol, formalin with lignosulfonate, followed by dispersing the obtained resin in the same lignosulfonate, and condensation is subjected to synthetic phenol in the presence of 15% sulfuric acid, the mixture was stirred at 40-45oC for 30 minutes, then serve formaldehyde at a temperature of 40-45oC with a speed of 4-5 l/min and at a temperature of 95-100oC the reaction mixture was kept under stirring until there is no free formaldehyde, the resulting phenol-formaldehyde resin is dispersed in a heated up to 50-60oC the lignosulfonate, the mixture was stirred at 95-100oC for 3-4 hours until the pH of the finished product 3,5-4,5.

Replacement of one component condensation upon receipt of synthetic tanning agent is phenol, part of the waters of thermal processing of oil shale, synthetic phenol will reduce the cost process to exclude extremely durable, the synthetic tanning agent based on phenol, while retaining a measure of the purity level of the known synthetic tanning agent.

The method is illustrated an example of a synthetic tanning agent D.-3.

Charged to the reactor 660 kg 100% synthetic phenol, 140 l of diluted 15% sulfuric acid and 130 l of lignosulfonate. The mixture was thoroughly stirred at 40-45oC for 30 minutes the pH of the mass should be approximately equal to 2. Then served formalin (36,6%) at a temperature of 40-45oC with a speed of 4-5 l/min in the number 264 HP At a temperature of 95-100oC the reaction mixture was kept under stirring until no odor of formaldehyde. The resulting phenol-formaldehyde resin is dispersed in a heated up to 50-60oC the same lignosulfonate, which is used when receiving a phenol-formaldehyde resin, taken in an amount 4950 kg (tanning substances 165% by weight 100% phenols). The mixture was stirred at 95-100oC for 3-4 hours. The resulting mixture is stable to hydrolysis and adding the lye.

The solubility of mass is considered achieved if you dilute it with water and add a few drops of alkali precipitate is not formed, the pH of the finished product in the range of 3.5 to 4.5.

The obtained synthetic tanning agent D. -3 has p the political tanning agent will:

to expand the range of used synthetic tanning agent;

- replace one of the components of the condensation of a phenol, which is part of the waters of thermal processing of oil shale, synthetic phenol than reduced the price process and excluded from it are extremely active shale phenols;

- to obtain a synthetic tanning agent with a stable quality indicators, namely the purity.

The method of production of synthetic tanning agent joint condensation of phenol, formalin with lignosulfonate, followed by dispersing the obtained resin in the same lignosulfonate, characterized in that the condensation is subjected to synthetic phenol in the presence of 15% sulfuric acid, the mixture was stirred at 40-45oC for 30 min, then served formaldehyde at a temperature of 40-45oC with a speed of 4-5 l/min and at a temperature of 95-100oC the reaction mixture was kept under stirring until no odor of formaldehyde, the resulting phenol-formaldehyde resin is dispersed in a heated up to 50-60oC the lignosulfonate, the mixture was stirred at 95-100oC for 3-4 h until the pH of the finished product, equal to 3.5 to 4.5.

 

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