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Green process for synthesizing adipic acid from cyclohexanone

A technology of adipic acid and cyclohexanone, applied in the production field of organic chemical raw materials, can solve problems such as harsh reaction conditions

Inactive Publication Date: 2016-06-01
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose and prepare a transition metal-modified composite MFI-type titanium-silicon molecular sieve catalytic molecule for the reconsideration, transformation and design of traditional reaction processes that are still used in large quantities in petrochemical production enterprises. The green technology route for the synthesis of adipic acid by oxygen oxidation of cyclohexanone has the advantages of simplifying the process, reducing costs, and greatly increasing resources, and at the same time solves the problems of environmental pollution and harsh reaction conditions.

Method used

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  • Green process for synthesizing adipic acid from cyclohexanone
  • Green process for synthesizing adipic acid from cyclohexanone
  • Green process for synthesizing adipic acid from cyclohexanone

Examples

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Embodiment 1

[0020] Example 1: At a temperature of 100° C. and a pressure of 0.6 MPa, air is used as an oxidant, 400 g of cyclohexanone and 1.0 g of a catalyst are put into a reactor for reaction. The result of reacting for 9 hours was as follows: the conversion rate of cyclohexanone was 19.6%, and the selectivity of adipic acid was 78.8%.

Embodiment 2

[0021] Example 2: At a temperature of 90° C. and a pressure of 0.6 MPa, air is used as an oxidant, 400 g of cyclohexanone and 1.0 g of catalyst M2-TS are put into a reactor for reaction. The result of reacting for 9 hours was as follows: the conversion rate of cyclohexanone was 56.4%, and the selectivity of adipic acid was 91.5%.

Embodiment 3

[0022] Example 3: At a temperature of 100° C. and a pressure of 0.6 MPa, air is used as an oxidant, 400 g of cyclohexanone and 1.0 g of catalyst M3-TS are put into a reactor for reaction. The result of reacting for 9 hours was as follows: the conversion rate of cyclohexanone was 36.4%, and the selectivity of adipic acid was 78.8%.

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Abstract

The invention relates to a green process for synthesizing adipic acid from cyclohexanone, wherein a transition metal modified composite MFI titanium-silicon molecular sieve is adopted as a catalyst and catalyzes molecular oxygen to oxidize cyclohexanone at an operating temperature of 40-180 DEG C under an operating pressure of 0.1-2.0 MPa so as to prepare the adipic acid, wherein a transition metal salt is modified and then is subjected to a high-temperature calcination treatment to form a composite catalyst precursor, and then a water vapor heat treatment is performed to make the transition metal ions be subjected to an ectopic selection treatment process on the catalyst so as to obtain the composite catalyst. According to the present invention, the advantages of high adipic acid selectivity and green process are provided.

Description

technical field [0001] The invention belongs to the technical field of production of organic chemical raw materials, and relates to a method for preparing a catalyst, in particular to a composite MFI titanium-silicon molecular sieve modified with a transition metal, which is used to catalyze the oxidation of cyclohexanone by molecular oxygen to synthesize adipic acid. Background technique [0002] Adipic acid, commonly known as fatty acid, is a white crystal at room temperature. It is an important chemical raw material and is widely used in the production of nylon-66, polyurethane foam, plasticizer, food additives and medicine. 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] Industrial adipic acid synthesis process based on benzene mainly has the following three methods: cyclohexane method, cyclohexene method and phenol method. Among th...

Claims

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Application Information

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IPC IPC(8): C07C51/31C07C55/14B01J29/89
Inventor 尹笃林钟文周邹国强毛丽秋伏再辉徐琼兰支利
Owner HUNAN NORMAL UNIVERSITY
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