Method for synthesis of aniline and alkali-chloride with electrochemical conjugate synthesis

Abstract

The invention relates to a technical method for synthesizing aniline and chlor-alkali in pair. In the method, an electrochemical reaction is carried out in a three-chamber diaphragm electrolyzer, and three chambers of the electrolyzer are an anode chamber, a cathode chamber and an intermediate chamber, wherein the anode chamber and the intermediate chamber are separated by an anion exchange membrane, and the cathode chamber and the intermediate chamber are separated by a cation-exchange membrane. The anode uses graphite anode, DSA anode or lead anode and other anode materials; and the cathode uses platinum, silver, copper, lead, nickel, copper nickel alloy, copper amalgam, carbon steel, stainless steel, graphite, glass carbon and other materials. Catholyte consists of 1 to 20 percent of nitrobenzene, water (or mixture of water and alcohol), 0 to 5 percent of surface active agent, pH conditioning agent and 0 to 35 percent of supporting electrolyte; while anolyte consists of 5 percent critical saturated sodium chloride solution and trace additive; and solution in the intermediate chamber consists of 5 percent critical saturated sodium chloride. Products of electrolysis are aniline and chlorine with a by-product sodium hydroxide. Synthesis of aniline and chloro-alkali in pair by electrochemistry saves assembly and consumption of all links of hydrogen from production to application on one hand, and reduces pressure of the electrolyzer, electricity consumption and cost on the other hand.

Description

technical field [0001] The invention relates to a technical method for electrochemically synthesizing chlor-alkali and synthesizing aniline in pairs. Background technique [0002] The chlor-alkali industry belongs to the basic chemical raw material industry. Chlorine gas and caustic soda are the two main products of the chlor-alkali industry, and hydrogen can be further converted into many chemical products. The main products of the chlor-alkali industry: caustic soda, chlorine, and hydrogen are also widely used in medicine, metallurgy, electric power, national defense, military industry, building materials, and food processing. There are thousands of alkali-consuming and chlorine-consuming products. my country consumes nearly 10 million tons of alkali. The industry's technical equipment is mature and reliable. [0003] Aniline is widely used in MDI, dyes and pigments and their intermediates, rubber additives, medicines, pesticides, organic intermediates, etc. It is an imp...

AI Technical Summary

Problems solved by technology

There are two main types of catalysts for the catalytic hydrogenation of nitrobenzene to produce aniline, one is CuO / SiO with copper supported on a silica carrier 2 Catalysts, and improved catalysts that add second components such as Cr and Mo. The advantages of this type of catalyst are low cost, good selectivity, and the disadvantage is poor toxicity resistance. Trace organic sulfides can easily poison the catalyst; Precious metal catalysts supported by Pt, Pd, Rh and other metals on alumina, activated carbon and other carriers. This type of catalyst has the advantages of high catalytic activity and long life, but the precious metal will be lost and the production cost is high.

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