DE453477C - Process for tanning animal skins - Google Patents

Description

Process for tanning animal hides. The condensation products from halogenated aldehydes, ketones or ethers with aromatic hydrocarbons or are oxy compounds. resinous, mostly non-crystallizing compounds, which sometimes have the character of dyes.

It has now been found that they are water-soluble in a suitable manner made simple or mixed condensation products or with by condensation of the aldehydes, ketones or ethers mentioned with water-soluble in a suitable manner aromatic oxy compounds made condensation products of animal origin Skin can be converted into leather with excellent properties. Some of the -called condensation products are more or less colored and can be due to appropriate treatment, e.g. B. with reducing agents, be lightened or decolorized.

You get excellent leather even if you cover the nakedness with such Treated products that are obtained instead of the pure halogenated Ketones, aldehydes or ethers their mixtures with non-halogenated compounds, how they z. B. incurred in manufacture, used.

Instead of phenol, cresol, primordial tar phenols or the like can also be used. Any non-condensed fractions can be distilled off in a stream of steam will. All of the products available in this way are also ideal for Combination tanning with each other, with other synthetic ones as well as with natural tanning agents.

Examples i. In 12.3 kg of phenol are slowly q. kg monochloroacetone and 8 kg concentrated hydrochloric acid entered. After the condensation has ended and the hydrochloric acid has been washed out, the product is sulfonated with 10 kg of sulfuric acid (96 percent) at about 95 ° with stirring. By adding 2% sodium hydroxide solution, the sulfonation product is brought to an acidity of about - 9 ccm NaOH brought. After dilution with water, the solution is used in the usual way for tanning.

2. 10 kg of monochloroacetone are left in 50 kg of tricresol at 100 ° with stirring and run in 3o kg of concentrated hydrochloric acid. When the development of hydrochloric acid has ended, so the condensation product is washed out and treated with 60 kg of concentrated sulfuric acid sulfonated.

Instead of phenol or tricresol, z. B. primordial tar phenols or polyoxy compounds such as resorcinol can be used.

Any non-condensed fractions can be distilled off in a stream of steam before the sulfonation. i By adding 10% sodium hydroxide solution, the sulfonation product is brought to an acidity of ± 3o ccm NaOH and this broth, after diluting with water, is used for tanning in the usual way.

3. In 113 kg of phenol, 3 1 q. Are slowly added at iodo with stirring. kg monochloroacetaldehyde and 6o kg concentrated hydrochloric acid entered. After the condensation has ended and the hydrochloric acid has been washed out, the product is sulfonated with 80 kg of concentrated sulfuric acid at about 95 '.

The product is brought to an acidity -z g --- rz ccm NaOH by neutralizing it with 10% sodium hydroxide solution and after dilution used as tanning broth with water.

q .. In 141 kg of phenol, 46 kg of monochloroacetone and 98 kg of concentrated hydrochloric acid entered with stirring. After condensation has ended and washing out the hydrochloric acid, the condensation product is produced along with 149 kg of sodium stilfit (crystallized), 97 kg of water and .a., ä kg of 4% formaldehyde for a few hours warmed on the water bath until complete water solubility has occurred. the The solution thus obtained is acidified by adding 10 kg of 5% acetic acid and can then easily be used for tanning.

5. 10.7 kg of chloroethyl methyl ketone and about 30 kg of concentrated hydrochloric acid are allowed to flow slowly into 33.8 kg of phenol while stirring at 95 ° to 100 °, and stirring is continued at the same temperature until the reaction is complete. After the condensation product has been separated from the aqueous hydrochloric acid and washed out with water, it is treated with 20 kg of concentrated sulfuric acid at about 95 ° with stirring until it is water-soluble. This sulfonation mixture is brought to an acidity of rg zz ccm NaOH and can be used for tanning in the usual way after dilution with water.

6 .. In 100 kg of phenol 5.1 kg of asymmetric dichloro ether C, H, "Ö # CH (Cl) # CH, # Cl are run in and heated with stirring until the evolution of hydrochloric acid and ethyl chloride has ended The condensation product is sulphonated with 7.8 kg of concentrated sulfuric acid in the heat. The sulphonation mixture is brought to an acidity of about - zo ccm by adding ao percent sodium hydroxide solution Brought NaOH and, after diluting with water, serves as a tanning liquor.

7. Instead of asymmetrical dichloro ether, the crude chlorination mixture obtained during the chlorination of ether is used and processed as in Example. After neutralizing with 10% sodium hydroxide solution to an acidity of --- 6 ccm NaOH 'and dilution with water, the broth is used for tanning.

B. The products can also be used for combination tanning, for example with sumac, can be used.

Claims (1)

PATENT CLAIM: Process for tanning animal hides, characterized in that that the sound pecs with the simple or mixed halogenated ketones or ethers or halogenated aldehydes or their derivatives with aromatic oxy compounds, with or without addition of condensing agents, obtained sulfonated or on condensation products brought into water-soluble form in other ways, with or treated without the addition of other synthetic or natural tanning agents.