Sodium 3 - nitrobenzenesulfonate USES and production methods

Chemical properties: Sodium 3 - nitrobenzenesulfonate is white crystal. Soluble in water and ethanol.

Purpose: 1 was used as a catalyst, also used in organic synthesis, dye industry, etc. 2 this product is mild oxidant in fabric printing or pad dyeing steaming, can protect color, the fabric with scouring and mercerizing, to check the knife attached cover silk, pulp, can be offset reduction material, also can make dye synthesis of antioxidant. 3 the goods as reserving agent for VAT dyes, sulphur dyes and dye colour protective agent, rust remover and electroplating nickel back agent of the vessel, and dye intermediates and vanillin. 4 is the dye intermediates, as reserving agent for VAT dyes, sulphur dyes and dye colour protective agent, and can be used as a corrosion inhibitor and electroplating nickel back of the ship agent

Production methods: 1 industrial production can be made of nitrobenzene sulfonated and neutralization. Raw material consumption quota: benzene (98%) of 400 kg/t, sulfuric acid, nitric acid (98%) of 550 kg/t (98%) of 390 kg/t, liquid alkali (30%) of 500 kg/t, fuming sulfuric acid (including SO320 %) 410 kg / 550 kg/t t, lime, soda ash (95%), 30 kg/t. 2 in enamel kettle, to join the first 350 fuming sulfuric acid, control kettle temperature 0 ~ 5 ℃, under stirring slowly adding nitrobenzene, and keep within 1 h after 132 nitrobenzene kettle temperature to 100 ℃, heat preservation 2 h. Sulfonated sampling test the finish (1 ~ 2 material drops into 10 ml of the test tube containing water, no turbid prove to the finish line). After completion of sulfonation reaction, cooling, slowly in ice water, and in about 3 h add 2 000 salt, hours after salting out, quiet place for the night, suction, pressure dry, intermediate between nitrobenzene sulfonic acid.

Will be between nitrobenzene sulfonic acid into 500 copies of hot water, boil to dissolve. To remove a small amount of sulfone. 50 for soda ash and then add active carbon decoloring, hot filtration, the filtrate cooling crystallization. Filter cake with a small amount of water, under 50 ℃ dry, quick finished product.

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