Process for preparing adipic acid through cleaning catalytic oxidation of cyclohexanone, catalyst, and catalyst preparation method

Abstract

The invention relates to a process for preparing adipic acid through cleaning catalytic oxidation of cyclohexanone, a catalyst, and a catalyst preparation method, and discloses a transition metal-modified composite MFI titanium silicon molecular sieve and a preparation method thereof, and an adipic acid preparation, wherein a mass ratio of the preferred transition metal salt to the titanium silicon molecular sieve is (0.01-0.2):1. The catalyst preparation process respectively comprises dry ball milling, high temperature calcination, hydrothermal crystallization, and other steps. According to the present invention, the catalyst prepared according to the method is the composite catalyst having the characteristic of high dispersion of the transition metal oxide on the catalyst surface; and the modified composite MFI titanium silicon molecular sieve has high catalytic oxidation activity, and can be recovered and recycled.

Description

technical field [0001] The invention belongs to a process for preparing adipic acid by using cyclohexanone as a raw material, a catalyst used therein and a preparation method of the catalyst. Background technique [0002] Adipic acid is an important chemical raw material, mainly used in the manufacture of nylon-66 fiber, nylon-66 resin and polyurethane foam, and the production of plasticizer dioctyl adipate. In the organic synthesis industry, it is a The basic raw materials of nitrile, hexamethylenediamine and polyester polyols can also be used as raw materials for medicine, pesticides and adhesives. At present, the global production capacity of adipic acid has reached 3.4 million tons per year, and it is increasing year by year, with an annual growth rate of more than 3.36%. [0003] There are three main methods for the synthesis of adipic acid in industry: cyclohexane method, cyclohexene method and phenol method. Among them, cyclohexane method is the main production rout...

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Problems solved by technology

[0007] The object of the present invention aims at problems such as the use of corrosive concentrated nitric acid raw materials and the generation of nitrogen oxides, nitric acid vapor and waste acid liquid that seriously pollute the environment in the traditional production process of adipic acid, and proposes a compound modified by transition metal MFI-type titanium-silicon molecular sieve catalyzes the green process of oxidation of cyclohexanone with molecular oxygen to produce adipic acid, which solves the problems of environmental pollution, atomic interest rate and high production cost in the current production process.

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