SU40475A1 - Method for producing khaki sulphurous dye - Google Patents

Description

When receiving high-percentage anthracene from a technical product according to the recipe of prof. Sladkova as a by-product, the sodium salt of chdisulfonic acid carbazole is obtained. The authors of the present invention have found that the khaki sulphide dye can be obtained from the sodium salts of disulfonic acid carbazole thus obtained by baking a mixture of these acids with sulfur and sodium sulphate, which meets the requirements of the military department.

The process of obtaining sodium salts of carbazole-disulfonic acid and enriched anthracene according to the method of prof. Sladkova is as follows. Xylene and technical anthracene (30–40%) are loaded into the sulfoator, the mixture is heated to 110–115 ° for complete dissolution. Then the temperature is lowered to 98 ° and set in the apparatus, vitriol oil, taken into the latter based on the carbazole monosulfonic acid. At the end of the sulfonation, the reaction mixture is allowed to stand, and it is divided into two layers: the top one from the solution of anthracene in xylene and the bottom one from the sulfonated carbazole and the acid residue.

The lower layer is separated from the upper layer and is again sulphurized with monohydrate to disulfonic acid of carbazole.

After secondary sulfonation, the sulfomass is neutralized with chalk and the solution of calcium salts of carbazole disulfonic acid is filtered off from gypsum. Calcium salts are then converted to sodium salts with soda or sodium sulphate, filtered from chalk or gypsum and allowed to float.

After evaporation, technical sodium salt of disulfonic acid carbazole with a content of 30–40% of water, which can be directly processed into a sulfur dye, is formed.

Example. In an iron pot placed in an oil bath heated to 140, put a mixture of 102 g, sulfurous soda 60Vo) 54 g of lump sulfur and sodium disulfonic acid carbazole in an amount of 50 g, calculated on the dry salt. Next, the bath temperature is raised first to 170 ° at a speed of 10 ° per hour, then to 270 ° at a speed of 20-30 ° per hour. The whole process of baking lasts b-7 hours.

After the reaction, melts in the amount of 150-155 g.

Dyeing using the dye obtained in this way is carried out using the usual dyeing method using sulfur dyes at a rate of 10% vyrasok.

The cotton is durable and olive green.

subject matter of the invention.

The method of obtaining sulfurous sulfur: khaki bodies, characterized in that fusing with sulfur and sodium sulphate in a baking process at 250-300 noflBepraiOT technical sodium salt containing 30-40% of water

Carbazole disulfonic acid, obtained in a known manner by sulphurization of 30-AO / anthracene dye solution, separation of anthracene xylene solution from sulphonation products, treatment of the latter with flue sulfuric acid to disulfonate and transfer the formed sulfonic acids through calcium salts into sodium.