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High-selectivity production process for preparing butanedioic anhydride through maleic anhydride liquid-phase hydrogenation

A maleic anhydride liquid-phase method and succinic anhydride technology, applied in the direction of organic chemistry, can solve the problem of succinic anhydride not being able to balance selectivity and large-scale industrial production, and achieve increased heat capacity, small filling volume, and reduced temperature rise Effect

Pending Publication Date: 2022-05-03
DALIAN UNIV OF TECH +1
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Problems solved by technology

[0010] In order to solve the problem that the existing technology of hydrogenation of maleic anhydride to prepare succinic anhydride cannot take into account selectivity and large-scale industrial production, the present invention provides a high-selection production process for preparing high-purity succinic anhydride by hydrogenation of maleic anhydride in liquid phase

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  • High-selectivity production process for preparing butanedioic anhydride through maleic anhydride liquid-phase hydrogenation

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Embodiment 1

[0034] 5. 15t / h raw material maleic anhydride 1, supplemented butyrolactone solvent 2, and circulating butyrolactone solvent 13 are mixed in the mixing tank A at a volume ratio of 1:10, and a circulating pump B is installed at the bottom of the mixing tank A to continuously Feed liquid is pumped back to the top of mixing tank A. The mixed material liquid is pressurized by the raw material pump C and mixed with the new hydrogen 3 and the circulating hydrogen 13 of the 3.5MPaG pipe network outside the boundary. The volume ratio of maleic anhydride to hydrogen is 1:2. The temperature of the material in the mixture M is 82°C. The mixed material is cooled to 60°C by the water cooler D, and enters the non-adiabatic reactor E from top to bottom for liquid phase hydrogenation reaction.

[0035] The mixed material enters the non-adiabatic reactor E from top to bottom, the inlet temperature is 60°C, and the operating pressure of the reactor is 3.0MPa. The inner diameter of a single tub...

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Abstract

The invention belongs to the technical field of preparation of maleic anhydride downstream product butanedioic anhydride, and relates to a high-selectivity production process for preparing high-purity butanedioic anhydride through maleic anhydride liquid-phase hydrogenation. The high-selectivity production process for preparing high-purity succinic anhydride through maleic anhydride liquid-phase hydrogenation solves the problem that an existing technology for preparing succinic anhydride through maleic anhydride hydrogenation cannot give consideration to selectivity and large-scale industrial production at the same time. The reaction unit of the process can ensure high selectivity of succinic anhydride preparation, carbon deposition is avoided so as to improve the stability of the catalyst, and the rectification unit can ensure the separation precision of succinic anhydride, so that a high-purity succinic anhydride product is obtained through purification.

Description

technical field [0001] The invention belongs to the technical field of preparation of succinic anhydride, a downstream product of maleic anhydride, and in particular relates to a high-selectivity production process for preparing high-purity succinic anhydride by hydrogenating maleic anhydride in a liquid phase method. Background technique [0002] The molecular formula of succinic anhydride is C4H4O3. It is an important intermediate in the synthesis of organic chemicals. It is widely used in the fields of pesticides, medicines, dyes, construction, and synthetic resins. Especially in recent years, with the implementation of its derivative degradable plastics (PBS / PBAT), the demand for succinic anhydride in my country has grown rapidly. At present, the production scale of succinic anhydride in my country is small and the output is low, which cannot meet the domestic demand. [0003] Liquid-phase hydrogenation of maleic anhydride is currently the mainstream method for large-sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/60
CPCC07D307/60
Inventor 王克峰钱新华梁建国高鹏谭学东韩志忠张银龙
Owner DALIAN UNIV OF TECH
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