Method for synthesis of monosodium 8-amino-1-naphthol-3,6-disulfonate through hydrogenation catalysis and catalyst

Abstract

The invention discloses a method for synthesis of monosodium 8-amino-1-naphthol-3,6-disulfonate through hydrogenation catalysis and a catalyst. The catalyst is an active-carbon-loaded nickel molybdenum iron three-way catalyst. The method is as follows: a nitro T ammonium salt reaction liquid is employed as a reaction raw material, pH value adjustment pretreatment of the reaction raw material is carried out, then hydrogenation reduction is carried out by the active-carbon-loaded nickel molybdenum iron three-way catalyst, then alkali fusion and acidification are carried out, and monosodium 8-amino-1-naphthol-3,6-disulfonate is prepared. Preparation for the catalyst is simple, he nitro T ammonium salts can be reduced to amino T ammonium salts effectively, and the problems of catalyst poisoning, rapid inactivation and low recovery frequency and the like in the hydrogenation reduction process can be solved. The synthetic method raises the yield and the product purity of the hydrogenation catalysis technology greatly, generation of waste water and environment pollution are reduced, the technology steps are simple and safe, and the reaction is stable and easy to control.

Description

technical field [0001] The invention belongs to the field of chemistry, and in particular relates to a method for synthesizing 8-amino-1-naphthol-3,6-disulfonic acid monosodium salt by hydrogenation catalysis and a catalyst used therefor. Background technique [0002] Compound 8-amino-1-naphthol-3,6-disulfonic acid monosodium salt (English name: 8-Amino-1-naphthol-3,6-disulfonicacidmonosodium salt, CAS number: 5460-09-3, molecular formula: C 10 h 8 o 7 NS 2 Na, molecular weight: 341) is an important intermediate in the dye industry and an important intermediate in the production of water-soluble dyes. Its main purpose is to synthesize azo dyes, such as acid magenta 6B, acid scarlet G, acid black 10B, direct black, Reactive Brilliant Red K-2BP, Reactive Violet K-3R, Reactive Dark Blue K-R and more than 90 kinds of fuels, these dyes are used for dyeing woolen and cotton fabrics, and can also be used for the production of medicines. Since some dyes synthesized by benzidine ...

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Problems solved by technology

[0008] The catalyzer of the hydrogenation reduction process of the above 8-amino-1-naphthol-3,6-disulfonic acid monosodium salt is mainly Raney nickel, nickel alloy, palladium / carbon catalyst, etc., because a large amount of ammonium salts are contained in the reaction solution , sulfonic acid substances and other complex components, which makes the above-mentioned hydrogenation reduction process prone to catalyst poisoning, so that the catalyst is quickly deactivated, and there are big problems in the recycling of the above-mentioned catalysts, and the recycling times of the catalysts are low, resulting in High production cost, not suitable for industrial production

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