High-selectivity reactor and method for preparing butanedioic anhydride through maleic anhydride liquid-phase hydrogenation

A maleic anhydride liquid-phase method and succinic anhydride technology, applied in chemical instruments and methods, organic chemistry, chemical/physical processes, etc., can solve the problem that succinic anhydride cannot take into account selectivity and large-scale industrial production, and achieve catalyst Small filling volume, avoiding hot spots, and improving selectivity

Inactive Publication Date: 2022-05-10
DALIAN UNIV OF TECH +2
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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 the selectivity and large-scale indu

Method used

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  • High-selectivity reactor and method for preparing butanedioic anhydride through maleic anhydride liquid-phase hydrogenation

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Example Embodiment

[0028] Example 1

[0029] A non-adiabatic reactor A, the specific form is a tubular fixed-bed reactor, and an adiabatic reactor B, the specific form is a fixed-bed reactor. 5.15t / h maleic anhydride 1 and γ-butyrolactone 2 are mixed in a volume ratio of 1:10, and mixed with hydrogen 3 (supplemented new hydrogen + circulating hydrogen) in a volume ratio of 1:2, and then enter the non-adiabatic Reactor A. The reaction mass entered the non-adiabatic reactor from top to bottom, the inlet temperature was 80°C, and the operating pressure of the reactor was 3.0 MPa. In non-adiabatic reactor A, the inner diameter of a single tube of the tube bundle is 190 mm, with 420 tubes, and the tubes are filled with catalyst, and the volumetric space velocity is 0.5 h -1 . The shell side was cooled with circulating water 7 at 30°C, and the flow rate was 90.0 t / h, and it was operated in parallel with the reaction material. The outlet temperature of the non-adiabatic reactor A is 95.0°C, and the...

Example Embodiment

[0030] Example 2

[0031]Set up a non-adiabatic reactor A, the specific form of which is a tubular fixed-bed reactor, and an adiabatic reactor B, which is a fixed-bed reactor in the specific form. 5.15t / h maleic anhydride 1 and γ-butyrolactone 2 are mixed in a volume ratio of 1:10, and hydrogen 3 (supplementary new hydrogen + circulating hydrogen) is mixed in a volume ratio of 1:2, and then enters the non-adiabatic Reactor A. The reaction mass entered the non-adiabatic reactor from top to bottom, the inlet temperature was 60 °C, and the operating pressure of the reactor was 3.0 MPa. The inner diameter of a single tube of the tube bundle in the non-adiabatic reactor A is 190 mm, and there are 420 tubes. The tubes are filled with catalyst, and the volume space velocity is 0.66 h-1. The shell side was cooled with circulating water 7 at 30°C, and the flow rate was 90.0 t / h, and it was operated in parallel with the reaction material. The outlet temperature of the non-adiabatic r...

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Abstract

The invention belongs to the technical field of butanedioic anhydride preparation, and discloses a high-selectivity reactor and method for preparing high-purity butanedioic anhydride through maleic anhydride liquid-phase hydrogenation. The first-section reactor is a non-adiabatic reactor, and reaction heat is continuously removed in a shell pass by using a cooling medium. And gamma-butyrolactone is adopted as a solvent, so that the reaction selectivity is improved. According to the method, large-volume cold hydrogen does not need to be adopted to absorb reaction heat, the reactor volume and the catalyst filling volume are smaller under the same scale, the reaction heat can be effectively removed, the high selectivity of succinic anhydride preparation is ensured, carbon deposition is avoided, the stability of the catalyst is improved, and large-scale industrial production can be met.

Description

technical field [0001] The invention belongs to the technical field of succinic anhydride preparation, and relates to a high-selectivity reactor and a method for preparing high-purity succinic anhydride by hydrogenating maleic anhydride in a liquid phase. Background technique [0002] The molecular formula of succinic anhydride is C 4 h 4 o 3 , is an important intermediate in the synthesis of organic chemicals, and has a wide range of applications 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-scale production of succinic anhydride. T...

Claims

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Application Information

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IPC IPC(8): B01J8/06B01J8/02C07D307/60
CPCB01J8/0242B01J8/06B01J8/067C07D307/60
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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