Environment-friendly method for preparing adipic acid by catalytic oxidation

A technology for catalytic oxidation and adipic acid, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylate, etc., can solve problems such as difficult to show catalytic activity, high reaction temperature, long reaction time, etc., and achieve remarkable Catalytic activity, simple preparation method, and the effect of improving the problem of serious deactivation
CN102816054BActive Publication Date: 2014-11-05ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2014-11-05

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Abstract

The invention discloses an environment-friendly method for preparing adipic acid by catalytic oxidation. The method includes: at the beginning of reaction, adding cyclohexane, butanone serving as solvent, cyclohexanone serving as initiators and activated carbon supported nano-gold catalysts into a stainless steel high-pressure reactor; carrying out the catalytic oxidation reaction for 3-14 hours under the pressure of 0.9-2.1MPa at the temperature of 100-150 DEG C; separating after the reaction is completed to obtain the activated carbon supported nano-gold catalysts and reaction liquor, and processing the reaction liquor to obtain adipic acid crystalline solid; collecting the cyclohexanone serving as the initiators by oil-phase vacuum rotary steaming; and washing and drying the activated carbon supported nano-gold catalysts for recycling. By the method, solvent effect of the butanone serving as the solvent is particularly suitable for the nano-gold catalysts to catalyze the cyclohexane to generate the adipic acid by means of selective oxidation, and the problems of low activity and proneness to inactivation of the catalysts in reaction are solved. The method is simple in technological process, convenient for preparing and separating the catalysts, mild in reaction conditions, low in technological cost, economic, efficient and environment-friendly and pollution-free as molecular oxygen substitutes for nitric acid to be used as oxidants.
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Description

Technical field

[0001] The invention relates to a method for preparing adipic acid by environmentally friendly catalytic oxidation. Background technique

[0002] As an important organic intermediate and raw material, adipic acid is widely used in chemistry, medicine, food and other industrial fields, and the industrial demand is huge. The existing production process of adipic acid is mainly a two-step cyclohexane oxidation process, which requires the use of nitric acid as an oxidant, and the nitrogen oxides produced during the process cause serious environmental pollution. In order to replace the nitric acid oxidation method, scholars at home and abroad have done a lot of research work on the one-step catalytic oxidation of adipic acid, but a process that can achieve both environmental protection and high efficiency and low cost is still in urgent need of discovery.

[0003] In recent years, in order to improve the conversion rate and selectivity of the one-step process for the pr...

Claims

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