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Method for coke benzene oxydation to produce maleic anhydride

A technology for coking benzene and maleic anhydride, applied in the direction of organic chemistry, etc., can solve the problems of incapable production, processing, large investment and high technical requirements

Active Publication Date: 2006-02-15
山西侨友化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires a large investment, very harsh operating conditions, high technical requirements, cannot recover thiophene, and consumes considerable energy
So far, the crude benzene catalytic hydrogenation technology and equipment have not been mastered in China, and it cannot be produced and processed, so it must be imported from abroad. At present, only two domestic manufacturers adopt this method

Method used

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  • Method for coke benzene oxydation to produce maleic anhydride
  • Method for coke benzene oxydation to produce maleic anhydride
  • Method for coke benzene oxydation to produce maleic anhydride

Examples

Experimental program
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Effect test

Embodiment 1

[0113] The combined process of crude benzene refining pickling process and benzene oxidation to maleic anhydride process is as described in the following examples, see figure 1: crude benzene g, 57,000 tons / year, enter crude benzene refining pickling process B, process and refine, get product coking benzene a, 37,500 tons / year, coking toluene o, 7150 tons / year by-product simultaneously, coking two Toluene p, 2120 tons / year, acid slag k, 4240 tons / year, alkali slag m, 5300 tons / year; coking benzene a produced by B is used as raw material for benzene oxidation to maleic anhydride process A, and the product is obtained through catalytic oxidation reaction Maleic anhydride f, 30,000 tons / year, at the same time by-product 2.5Mpa high-pressure steam d, 135,000 tons / year, sent to crude benzene refining pickling process B, as the heat source of each distillation tower in the refining process. Therefore, the combination of these two processes realizes the complementarity, mutual benefi...

Embodiment 2

[0127] The combined process of crude benzene refining extractive distillation process and benzene oxidation to maleic anhydride process is as described in the following examples, see figure 2 : Crude benzene g, 18.5 tons / year, enters crude benzene refining extraction and rectification process C, after processing and refining, the product coking benzene a is obtained, 125,000 tons / year, and the by-product coking toluene o, 28,200 tons / year, coking Xylene p, 8325 tons / year, and high value-added thiophene t, 1000 tons / year, no acid residue and alkali residue discharge; coking benzene a produced by C is used as the raw material of benzene oxidation to maleic anhydride process A, through catalytic oxidation The reaction produces maleic anhydride f, 100,000 tons / year, and the by-product 2.5Mpa high-pressure steam d, 448,000 tons / year, is sent to crude benzene refining extractive distillation process C as a heat source for each distillation tower in the refining process. Therefore, ...

Embodiment 3

[0135] The combined process of crude benzene refining extractive distillation process and benzene oxidation to maleic anhydride process, N-methylpyrrolidone is used as the extraction agent, and the solvent ratio is 6:1. The benzene extraction tower 25 operates under normal pressure, and the operating temperature at the top of the tower is 73°C; the tower 20 operates under normal pressure, and the operating temperature at the top of the tower is 80°C; the tower 26 operates under normal pressure, and the operating temperature at the top of the tower is 81°C; The operating pressure of the extraction tower 27 is normal pressure, and the operating temperature at the top of the tower is 80°C; the operating pressure of the thiophene refining tower 28 is normal pressure, and the operating temperature at the top of the tower is 84°C; the tower 22 is operated at normal pressure, and the temperature at the top of the tower is 140°C . After the above process, the obtained coked benzene ha...

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Abstract

Disclosed is a method for coke benzene oxydation to produce maleic anhydride by integrating crude benzene purification process and maleic anhydride preparation through benzene oxidization, the process comprises using carbonized crude benzene as raw material, refining crude benzene to obtain carbonized benzene for benzene oxidization, thus preparing maleic anhydride and by-product of high-pressure vapor, which can be used as heating source for the purification distillation of crude benzene. the benzene oxidization maleic anhydride preparation employs the conventional catalytic oxidation, the crude benzene purification employs an acid washing process or extraction and fractional distillation.

Description

technical field [0001] The invention belongs to a method for producing maleic anhydride by oxidation of coking benzene, in particular to the whole process of refining coking crude benzene (including sulfuric acid washing method and extractive distillation method) and benzene oxidation to maleic anhydride. Background technique [0002] The method report of benzene oxidation system maleic anhydride is a lot, and its process route is similar, as SD method (Hydrocarbon Process.48 (11) 197 (1969)), VEBA method (Hydrocarbon Process.46 (11) 198 (1967)), combined method ( Chem. Eng. 79(26) 64(1972)) et al. The domestic production method of maleic anhydride is very close to the SD method in the United States. The above-mentioned method is basically divided into a benzene oxidation process and a post-treatment process of its product. The process is: Benzene (steam) and air are mixed in a certain proportion, then enter from the top, pass through the tubular oxidation reactor from top...

Claims

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Application Information

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IPC IPC(8): C07D307/60
Inventor 石俊来
Owner 山西侨友化工股份有限公司
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