DE319713C - Process for the preparation of condensation products from N-aryl sulfoderivatives of aromatic aminosulfonic acids - Google Patents

Description

Process for the preparation of condensation products from N-aryl sulfoderivatives aromatic aminosulfonic acids. It was observed that the N-arylsulfoderivatives of aminosulfonic acids of the benzene or naphthalene series, e.g. B. p-toluene-sulfaminobenzene-p-sulfonic acid, have the property of flocculating acidified protein solution. Tanning properties however, do not have these compounds. But they are converted into real tannins, when formaldehyde is suitably reacted with the N-aryl sulfoderivatives brings.

Example 1.

195 parts of sodium sulfanate become anhydrous with 60 parts Sodium carbonate dissolved in about 2,000 parts of water and mixed with 195 parts of p-toluenesulfonyl chloride Stir vigorously until all of the sulfochloride has disappeared. Which are still weak soda-alkaline liquid which partially crystallizes the sulfamide compound contains excreted, about 11o parts of 3o percent formaldehyde are added and heated in a closed vessel to rqo to 150 ° for 5 to 6 hours.

After cooling, a little mineral acid is added until it is clearly visible acidic reaction and thereby receives a ready-to-use tanning solution, the animal one Skin transformed into full-fledged leather.

Example e.

223 parts of i-aminonaphthalene-6-sulfosäitre become anhydrous with 120 parts Sodium carbonate dissolved in about 2500 parts of water and stirred for 24 hours 190.5 parts of p-toluenesulfonyl chloride with gradual warming to 4o to So ° in the toluenesulfamide compound converted. The one that still reacts slightly alkaline Liquid becomes with 11o parts 3o percent formaldehyde in a closed vessel heated to 14o to 150 'for 8 hours.

After cooling and weak acidification you get a ready-to-use one Tanning solution. By adding about zoo parts of table salt, the tannin falls as initially resinous, soon solidifying mass, which separated by suction and then can be dried.

The tannin is easily soluble in water; he falls protein solution very strong. Ferric chloride solution produces a pale brown color.

Example 3.

223 parts of i-aminonaphthalene-6-sulfonic acid are dissolved with about 2,000 parts of water and 12o parts of anhydrous sodium carbonate and stirred with 235 parts of nitro-p-toluenesulfochloride for about 24 hours, gradually warming to 40 to 50, until the formation of the nitrotoluenesulfamide compound has ended is. This is reduced in a known manner with iron and a little acetic acid and filtered from the iron sludge after the acid has been blunted. The solution of the amino: oluolsulfan-iidverbindungen is mixed with xoo parts of 3o percent formaldehyde; then, while stirring, gradually 600 parts = 0 percent. Pour in acetic acid and stir until the ' formaldehyde odor has disappeared.

Table salt, the tannin, falls out of the mineral acidified solution as resin that soon solidifies.

After drying, the product forms a gray colored powder that is readily soluble in water and has excellent tannability.

In the above examples, instead of the starting materials mentioned there other aminosulfonic acids of the benzene or naphtha series with similar success or their derivatives are used.

Claims (1)

PATRNT CLAIM: Process for the representation of condensation products from N-aryl sulfoderivatives of aromatic aminosulfonic acids, characterized in that that one on N-arylsulfoderivate of aminosulfonic acids of the benzene or naphthalene series Allow formaldehyde to act.