Apparatus and method for preparing adiponitrile by electrolyzing acrylonitrile assisted by electro-active microbes

Abstract

The invention discloses an apparatus and a method for preparing adiponitrile by electrolyzing acrylonitrile assisted by electro-active microbes. The apparatus comprises a microbe electrolytic tank, a data acquisition system and a recording unit, wherein an anode electrode and a cathode electrode of the microbe electrolytic tank are made of electrically inert materials; the anode electrode and the cathode electrode are connected through a titanium wire, a constant potential rectifier and a resistor; the data acquisition system is connected with the resistor in parallel; and the recording unit is connected with the data acquisition system. The method comprises the steps of organic materials are metabolized by electro-active microbes in an anode chamber of the microbe electrolytic tank to produce electrons and protons; the produced electrons are transferred to the anode electrode directly or indirectly and then transferred to the cathode electrode along an external circuit under the effect of an applied voltage; at the same time, H<+> ions pass through an ion exchange membrane and are migrated to a cathode chamber of the microbe electrolytic tank; H<+> ions, the electrons and acrylonitrile are combined on the surface of the cathode electrode with relatively high hydrogen evolution over potential to generate adiponitrile. The apparatus and the method have the advantages of low energy consumption, no corrosions to the anode electrode, etc. Besides, the apparatus and the method can reduce discharge of organic wastes.

Description

[0001] technical field [0002] The invention relates to a device and a method for preparing adiponitrile by assisted electrolysis of acrylonitrile by electroactive microorganisms. Background technique [0003] Adiponitrile is an intermediate for the manufacture of nylon 66, and can also be used as an auxiliary agent and herbicide for rubber production. The production methods of adiponitrile include: adipic acid method, butene chlorination-nitrilation method, butene direct hydrocyanation method, and acrylonitrile hydrogenation dimerization method. The last method can be carried out by electrochemical reaction, which was first proposed by Baizer in 1959, that is, hydrogenation of acrylonitrile to adiponitrile by cathode. In 1965, the Monsanto Company of the United States industrialized this method and built an adiponitrile production workshop with a production capacity of 15,000t / a, which was later expanded to 100,000t / a and achieved significant economic benefits. Because t...

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Problems solved by technology

[0004] The biggest disadvantage of this process is high energy consumption and serious corrosion of the anode. The input electric energy is mainly used for electrolysis of anode water to provide protons for the reduction reaction of the cathode (H + ) and electrons (e - ), and the acid produced by the anode severely corrodes the equipment and the anode

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