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Benzene vapor and air (or oxygen) react to form maleic anhydride by vapor phase oxidation on catalysts supported on alpha-Al2O3 and V2O5-MnO3 as active components. Benzene oxidation is a traditional production method for maleic anhydride. The technology is mature and reliable. The main technologies are SD method in the United States, Alusuisle/UCB method and catalytic chemical method in Japan, among which SD method is the most popular one.
By-product method of phthalic anhydride
When phthalic anhydride is produced from o-xylene, a certain amount of maleic anhydride can be obtained by-product, and its output is about 5% of that of phthalic anhydride. In the production of phthalic anhydride, the reaction tail gas is discharged into the atmosphere after removal of organic matter by a scrubber. The scrubbing liquid is maleic anhydride and a small amount of impurities such as benzoic acid and phthalic acid. The product of maleic anhydride is obtained by concentration, refining and heating and dehydration.
The process of n-butane oxidation is to produce maleic anhydride by gas phase oxidation of n-butane with V2O5-P2O5 catalyst. Since its industrialization by Monsanto in 1974, the process has developed rapidly due to low cost of raw materials, low environmental pollution and abundant n-butane resources in Europe, America and other countries, representing the development trend of maleic anhydride production process.