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Bohua Engineering Improved Engineering design technology of maleic anhydride oxidation in n-butane fixed bed production technology, based on the digestion and absorption of maleic anhydride technology imported from abroad, and completed the localization of key equipment of maleic anhydride. The oxidation reaction capacity of a single set of n-butane process can reach 50 thousand tons/year; The Distillation and absorption capacity can reach 200,000 tons/year; Bohua Engineering maleic anhydride technology has formed a series and standardized production scale with an annual yield of 20, 25,50, 100, 150, 200 kilotons Our maleic anhydride producing progress has been continuously innovated in process flow, control scheme, energy saving and emission reduction.  The scale of reactor package and the core equipment, have been continuously expanded, and its performance has been continuously improved. Bohua Engineering maleic anhydride technology is in a leading position in maleic anhydride industry in China and has been included in the promotion technology of science and technology plan of China Petroleum and Chemical Industry Federation.