順酐的主要分兩類，早的方法采用苯作為原料，但由于原料本身 和對環境的危害性，以及經濟因素的影響，苯法的工藝在順酐中所占的比例日益 減小；
The production of maleic anhydride is mainly divided into two categories. In the early production method, benzene was used as the raw material. However, due to the harm of raw material and environment, and the influence of economic factors, the proportion of benzene process in maleic anhydride production is decreasing day by day;
目前順酐的主流方法采用正丁烷作為原料，包括固定床、流化床、移動床等， 這些工藝各有特點，大多均有實際的工業應用，但相同的是，這些正丁烷氧化制順酐的工 藝，均采用同一類催化劑，即釩磷氧(VP0)催化劑
At present, the main production methods of maleic anhydride use n-butane as raw material, including fixed bed, fluidized bed, moving bed and so on. These processes have their own characteristics and most of them have practical industrial applications. However, the same is that the same kind of catalyst, namely vanadium phosphorus oxygen (VP0) catalyst, is used for the oxidation of n-butane to maleic anhydride
順酐作為一種基礎性工業合成材料已為市場廣泛應用，其合成的關鍵要素一一順 酐催化劑的性能，直接影響順酐的收率、成本、質量、能耗和程度。
Maleic anhydride, as a basic industrial synthetic material, has been widely used in the market. The performance of maleic anhydride catalyst, the key factor of its synthesis, directly affects the yield, cost, quality, energy consumption and environmental protection of maleic anhydride production.
正丁烷氧化制順酐的催化劑早期曾經常試過多種催化劑，但經過多年的研究證實 VP0催化劑仍是迄今為止有用的催化劑體系。常規的VP0催化劑采用水溶劑或有機溶劑 法制得前驅體，所得前驅體通過焙燒活化和成型得到更終催化劑。
Many kinds of catalysts have been used for the oxidation of n-butane to maleic anhydride in the early stage, but it has been proved that VP0 catalyst is still a useful catalyst system up to now. The precursor of conventional VP0 catalyst was prepared by water solvent or organic solvent method, and the final catalyst was obtained by calcination, activation and molding.
目前，工業化應用的VP0 催化劑均采用非負載催化劑。由于VP0催化劑本身存在如比表面積較小、強度較低、傳熱效 果差等缺點。
At present, the industrial application of VP0 catalysts are all non supported catalysts. VP0 catalyst has some disadvantages such as small specific surface area, low strength and poor heat transfer effect.
