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正丁烷與丁烯均含有與順酐相同的碳原子數(shù)，是順酐的理想原料。由于正丁烷較其他原料低廉，用正丁烷更為有利。其流程與苯氧化法基本相同，催化劑為釩-磷-氧體系，添加劑有鐵、鉛、鋅、銅、銻等元素的氧化物。可用固定床反應(yīng)器或用流化床反應(yīng)器，反應(yīng)溫度約400℃。

Both n-butane and butene contain the same number of carbon atoms as maleic anhydride, making them ideal raw materials for producing maleic anhydride. Due to the lower price of n-butane compared to other raw materials, using n-butane is more advantageous. The process is basically the same as the benzene oxidation method, with a vanadium phosphorus oxygen system as the catalyst and oxides of elements such as iron, lead, zinc, copper, and antimony as additives. A fixed bed reactor or a fluidized bed reactor can be used, with a reaction temperature of about 400 ℃.

正丁烷-空氣混合物中正丁烷濃度為1.0%～1.6%(摩爾)。整個(gè)過程的順酐收率按正丁烷計(jì)約為50%。由于C4烴氧化的選擇性較低,因此設(shè)備投資較以苯為原料時(shí)為高，且后加工不能采用部分冷凝，而必須將反應(yīng)氣體中的順酐全部用吸收法回收，從而使能耗加大。但由于正丁烷比苯便宜，而且苯毒性大。因此，以正丁烷為原料是有吸引力的，對(duì)本法所用催化劑的改進(jìn)工作，各國都在大力進(jìn)行中。

The concentration of n-butane in a mixture of n-butane and air is 1.0% to 1.6% (mol). The yield of maleic anhydride in the entire process is approximately 50% based on n-butane. Due to the low selectivity of C4 hydrocarbon oxidation, the equipment investment is higher than when benzene is used as the raw material, and partial condensation cannot be used for post-processing. Instead, all maleic anhydride in the reaction gas must be recovered by absorption method, thereby increasing energy consumption. But due to the lower price of n-butane compared to benzene and the high toxicity of benzene. Therefore, using n-butane as the raw material is attractive, and countries are vigorously working on improving the catalysts used in this method.

順酐主要用于不飽和聚酯樹脂、醇酸樹脂、農(nóng)藥馬拉硫磷、低毒農(nóng)藥4049、長效碘胺的原料。也是涂料、馬來松香、聚馬來酐、順酐-苯乙烯共聚物的共聚單體，也是油墨助劑、造紙助劑、增塑劑、酒石酸、富馬酸、四氫呋喃等的有機(jī)化工原料。

Maleic anhydride is mainly used as a raw material for the production of unsaturated polyester resin, alkyd resin, pesticide malathion, high-efficiency and low toxicity pesticide 4049, and long-acting iodoamine. It is also a comonomer of coatings, maleic rosin, polymaleic anhydride, and maleic anhydride styrene copolymers. It is also an organic chemical raw material for the production of ink additives, papermaking additives, plasticizers, tartaric acid, fumaric acid, tetrahydrofuran, and other chemicals.