1,5-dinaphthylamine electrochemical synthesis method

Abstract

Provided is an electrochemical synthetic method of 1,5-diaminonaphthalene, which includes four steps that firstly the electrochemical synthetic of diaminonaphthalene is performed in an electrolytic cell which contains a cathode chamber and an anode chamber which are separated by a cation-exchange membrane which is taken as a permeable membrane, copper sheets and a calomel electrode which are installed in the cathode chamber are respectively taken as working electrodes and a saturated reference electrode, and ruthenium-plated iron screens which are arranged inside the cathode chamber are taken as auxiliary electrodes. Secondly catholyte is mixed solution of solvent N, N-dimethyl formamide, sulfuric acid solution supporting electrolyte and substrate 1, 5-diaminonaphthalene, and anolyte is sulfuric acid solution of which the volume is equal to the volume of the catholyte. Thirdly electrolyzation is performed at room temperature and under the condition that the working electrodes are driven by a certain constant potential relative to the saturated reference electrode. Fourthly after the electrolyzation is finished, the electrolytic solution is post-processed to obtain the product of 1, 5-diaminonaphthalene. The method has the advantages of simple requirement, easy preparation of the electrodes, ready availability of raw material, greening synthetic process, normal reaction temperature, small energy consumption, high yield and suitability to industrial production.

Description

technical field [0001] The invention relates to an electrochemical synthesis method of 1,5-diaminonaphthalene, which belongs to the technical field of electrochemistry. Background technique [0002] 1,5-diaminonaphthalene, English name: 1,5-diaminonaphthalene or1,5-naphthylene diamine, molecular formula C 10 h 10 N 2 , is a colorless crystal, with a melting point of 190°C, soluble in N,N-dimethylformamide, ethanol, ether and chloroform, slightly soluble in hot water, sublimable, and turns brown with time, and meets ferric chloride The solution is blue-purple and toxic. When using a large amount, the staff must wear protective clothing. 1,5-diaminonaphthalene has a wide range of uses, mainly used to manufacture 1,5-naphthalene diisocyanate, and is one of the raw materials for the synthesis of advanced polyurethane elastomers. It is often used in organic synthesis, pigments, dyes, medicines, pesticides, and rubber additives Raw materials and intermediates of various fine c...

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that when naphthalene is nitrated to prepare 1,5-dinitronaphthalene, a large amount of 1,8-dinitronaphthalene is generated, and the separation and purification of the product is difficult

[0008] In the existing synthesis technique of 1,5-diaminonaphthalene, or separation and purification are difficult, or synthesis technique is complicated, or reaction temperature is high, time is long, catalyst consumption is large, and reaction condition is harsh, or can produce a large amount of waste, so Compared with modern green synthetic methods, the existing synthetic processes have no advantages at all

[0009] At present, there is no report on the synthesis of 1,5-diaminonaphthalene by electrochemical method at home and abroad.