Method for preparing isobutyric acid through propylene carbonylation

By using an acidic molecular sieve catalyst in a fixed-bed reactor to carry out the carbonylation reaction of propylene, the problems of high raw material price and environmental protection in the preparation of isobutyric acid have been solved, and the preparation of isobutyric acid that is easy to separate and can be produced on a large scale has been realized.

CN122036485APending Publication Date: 2026-05-15DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
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Patent Information

Application Number
CN202411615300.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-13
Publication Date
2026-05-15

AI Technical Summary

Technical Problem

Existing isobutyric acid preparation processes suffer from problems such as high raw material prices, harsh reaction conditions, difficulty in product separation, high difficulty in industrialization, and environmental unfriendliness.

Method used

An acidic molecular sieve catalyst was used to carry out the carbonylation reaction of propylene in a fixed-bed reactor with propylene, carbon monoxide and water to produce isobutyric acid. The acidic molecular sieves used included hydrogen form ZSM-35, ZSM-11 and ZSM-5. The reaction conditions were optimized to 180-320℃ and 2-10MPa. The isobutyric acid was easy to separate after it was generated.

Benefits of technology

It achieves the advantages of cheap and readily available raw materials, low corrosivity, easy product separation, and easy industrialization of fixed-bed technology, making it suitable for large-scale production and reducing the discharge of waste gas, wastewater, and solid waste.

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Abstract

The invention discloses a method for preparing isobutyric acid through propylene carbonylation, and belongs to the field of catalytic chemistry. The method comprises the following steps: enabling raw materials containing propylene, carbon monoxide and water to pass through a reactor loaded with an acidic molecular sieve catalyst, and reacting to obtain a product containing isobutyric acid, the acidic molecular sieve catalyst is selected from at least one of a hydrogen type ZSM-35 molecular sieve, a hydrogen type ZSM-11 molecular sieve, a hydrogen type ZSM-5 molecular sieve, a hydrogen type ZSM-57 molecular sieve, a hydrogen type ZSM-23 molecular sieve, a hydrogen type ZSM-22 acidic molecular sieve and a hydrogen type MCM-22 molecular sieve. According to the isobutyric acid preparation method, raw materials are cheap and easy to obtain, system corrosivity is small, products are easy to separate, emission of three wastes is small, a fixed bed process is easy to engineer, and the method is suitable for single-set large-scale production.
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