China Drying Newsletter The n-butane oxidation maleic anhydride VPO-1 catalyst developed by the China Petroleum & Chemical Research Institute Fushun Petrochemical Research Institute has recently passed the technical review of Sinopec . It is reported that the performance of this catalyst has reached the level of similar foreign catalysts. Maleic anhydride is the second largest organic acid anhydride next to phthalic anhydride. Since the new process for the production of 1,4-butanediol by maleic anhydride esterification hydrogenation, maleic anhydride has become an important raw material with high added value of 1,4-butanediol, tetrahydrofuran and γ-butyrolactone. The n-butane oxidation method to maleic anhydride is under the action of VPO catalyst, n-butane and air generated gas-phase selective oxidation reaction to produce maleic anhydride. Due to low raw material consumption and small environmental pollution, the technology route has been rapidly developed at home and abroad in recent years. There is a trend to replace the benzene oxidation process to maleic anhydride production. However, there is no industrially applicable n-butane oxidation to maleic anhydride in China. VPO catalyst. After more than two years of technological innovation and scientific and technological breakthroughs, Fushun Petrochemical Research Institute successfully developed a VPO-1 n-butane oxidation to maleic anhydride catalyst. The catalyst uses vanadium pentoxide and phosphoric acid as raw materials, isobutanol as a reducing agent, and additives to prepare catalyst precursors. After being dried and calcined, the catalyst is made into a catalyst, and a special catalyst activation method is used to obtain a high specific surface area of ​​the catalyst. The laboratory results show that the VPO-1 catalyst has the characteristics of low reaction temperature, high space velocity, and good stability. The catalyst formulation, preparation method and activation method are determined and controllable, and the performance index has reached the n-butane oxidation to maleic anhydride. The production requirements, and its preparation and activation process are not "three wastes". The German standard flange is the main product of our company, DIN PN16 2502 series of flange products, we are mainly DIN series forging flange, we also do the United States, Japan, Britain, Germany, a series of products. Our strict quality management system, to win a lot of customers, the company won the national level over the same period three patents. Wish our customers came to negotiate. Din 2502 Pn16 Flange,Din 2502 Forged Pn16 Flange,Din 2502 Pn16 Welding Neck Flange Jinan HeChuang Mechanical Manufacturing Co., Ltd. , http://www.hechuangmechanical.com