Method of conducting hydroformylation reaction on C4 mixture to prepare aldehydes

Abstract

Provided is a method of conducting a hydroformylation reaction on a C4 mixture to prepare aldehydes. The method includes the steps: S1, in the presence of a first catalyst, the C4 mixture and a syngasmake contact in a first reaction region to be subjected to the hydroformylation reaction, and a first reaction product containing n-valeraldehyde and 2-methylbutyraldehyde is obtained, wherein the C4mixture is composed of 1-butylene and isobutylene and obtained by removing 2-butylene and 1,3-butadiene; S2, separation is conducted on the first reaction product, and a mixture of n-valeraldehyde and 2-methylbutyraldehyde, unreacted raw materials and a material flow which contains the first catalyst are obtained; and S3, in the presence of a second catalyst, the unreacted raw materials and the syngas make contact in a second reaction region to be subjected to the hydroformylation reaction, a second reaction product containing 3-methylbutyraldehyde is obtained, and optionally, the second reaction product is purified. According to the method of conducting the hydroformylation reaction on the C4 mixture to prepare the aldehydes, in a staged reaction mode, 1-butylene and isobutylene are subjected to the hydroformylation reaction separately to obtain different products, and advance separation of 1-butylene and isobutylene is avoided.

Description

technical field [0001] The invention relates to a method for preparing aldehyde by mixed carbon tetrahydroformylation reaction. Background technique [0002] It is a well-known process that olefins and synthesis gas undergo hydroformylation reaction under the action of a catalyst to generate aldehydes with one more carbon atom than olefins. [0003] For olefins without isomers such as ethylene and propylene, the hydroformylation reaction is relatively simple, and for olefins with more than four carbon atoms, because there are different isomers, the hydroformylation of various isomers The reaction conditions are different, and the structure of the product aldehyde is also different. It is difficult to separate the hydroformylation product aldehyde of some isomers. Therefore, for olefins with more than four carbons, it is not suitable to mix olefins with more than four carbons in the same reaction zone. The reaction is carried out simultaneously in the reaction, and it needs ...

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Problems solved by technology

[0007] It can be seen from the boiling point of each component in the mixed carbon four that there is a large difference between 2-butene and other components, and 2-butene can be separated from the mixed carbon four by conventional rectification. However, The boiling points of isobutene and 1-butene are very close, and it is difficult to separate isobutene and 1-butene by conventional methods

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