Maleic anhydride production technique

A maleic anhydride and production process technology, applied in the field of maleic anhydride production process, can solve problems such as unstable quality and low refining yield, and achieve high product quality, high utilization rate, and stable product quality Effect

Inactive Publication Date: 2008-04-09
山西新和太明化工有限公司 +1
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Problems solved by technology

[0004] The present invention provides a maleic anhydride production process in order to solve the prob

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  • Maleic anhydride production technique
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[0016] A production process for maleic anhydride, including the following steps: fixed bed catalytic oxidation of benzene, partial condensation, water absorption, constant boiling dehydration, rectification, (as shown in Figure 2), benzene oxidation and fixation used in the benzene oxidation reaction stage Two axial flow pumps are connected to the bed reactor. The rectification stage is a continuous rectification process. (as shown in Figure 4) the acid water and crude anhydride produced by the oxidation reaction are azeotropically dehydrated and first enter the middle of the solvent removal tower Then, the crude maleic anhydride in the liquid phase separated from the lower part of the solvent removal tower is sent to the middle of the rectification tower, and the gas phase components obtained from the outlet of the middle of the rectification tower are condensed by the condenser to obtain the finished product.

[0017] The diameter of the benzene oxidation fixed bed reactor used ...

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Abstract

The invention relates to a production method of maleic anhydride, in particular to a production process of maleic anhydride. The invention can solve the problems of low yield and instable quality of the production of maleic anhydride in the prior art. The invention includes the following steps: fixed bed catalytic benzene oxidation, partial condensation, water absorption, azeotropic dehydration and rectification, two axial flow pumps are connected on a benzene oxidation fixed bed reactor which is used in the stage of benzene oxidation reaction, the rectification stage is a continuous rectification process; compared with the prior art, the invention adopts two axial flow pumps to improve the molten salt circulating capacity of the benzene oxidation fixed bed reactor and adopts the continuous rectification process, which ensures the quality of the products to be high and stable, the refining yield can achieve more than 97 percent, and the annual output of maleic anhydride is more than 20000 tons.

Description

technical field [0001] The invention relates to a method for producing maleic anhydride, in particular to a process for producing maleic anhydride. Background technique [0002] The existing technology of benzene oxidation to produce maleic anhydride all adopts fixed-bed catalytic oxidation, partial condensation, water absorption, azeotropic dehydration and vacuum distillation. Rely on uniaxial flow pump to circulate heat carrier molten salt, use high-voltage electric to start fan, and the post-work section is intermittent operation. At present, 10,000 tons / year of benzene oxidation to produce maleic anhydride oxidation reaction device is shown in Figure 1. Relying on a large axial flow pump, a large flow of molten salt is circulated to extract reaction heat, which can make the temperature difference between the oxidation reactor and the molten salt Small. The uniformity of the amount of molten salt entering the oxidation reactor around (side length 3.2m) is achieved by un...

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Application Information

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IPC IPC(8): C07D307/60
Inventor 柳亚平胡靖文杨利平曹克林
Owner 山西新和太明化工有限公司
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