Maleic anhydride is used in the plastics industry to make plasticizers. The paper industry is used to manufacture paper treatment agents. Synthetic resin industry is used to manufacture unsaturated polyester resin, alkyd resin, etc. The coating industry is used to manufacture insulating paint, white enamel, baking paint, varnish, etc.

农药工业用于制造农药马拉松和低毒农药4049等。医药工业用于制造长效磺胺药。油脂工业用作脂肪、油的防腐剂。有机工业用于制造富马酸及四氢呋喃等。分析化学中用作化学试剂。

The pesticide industry is used to manufacture pesticide marathon and high efficiency and low toxicity pesticide 4049. It is used in the manufacture of long-acting sulfonamides in the pharmaceutical industry. The oil industry is used as a preservative for fats and oils. Organic industry is used to manufacture fumaric acid and tetrahydrofuran. Used as a chemical reagent in analytical chemistry.

将苯与空气混合(苯为1%-1.4% )经换热器预热后，进人列管式催化反应器。在压力为0.1-0.2MPa、温度为350-400℃的反应条件下进行氧化反应，所得产物经两台换热器、一台冷却器后，冷却到接近露点(55―65℃)。

Benzene is mixed with air (benzene is 1% - 1.4%) and preheated by heat exchanger before entering tubular catalytic reactor. The oxidation reaction is carried out under the reaction conditions of pressure 0.1-0.2mpa and temperature 350-400 ℃. The obtained product is cooled to close to the dew point (55-65 ℃) after passing through two heat exchangers and a cooler.

冷却后的反应物进入分离器，分离器底部得粗顺酐，进入粗顺酐罐。分离器顶部流出物进人洗涤塔，用水洗涤，塔顶为多余空气和未反应的苯，苯可用吸附回收。洗涤塔塔底水溶液进人脱水器，分离出水，所得粗顺酐进人粗顺酐罐。粗顺酐进一步进人蒸馏塔进行蒸馏精制，得顺酐。所得山东顺酐可进行异构化得富马酸和苹果酸。

The cooled reactant enters the separator. Crude maleic anhydride is obtained at the bottom of the separator and enters the crude maleic anhydride tank. The effluent from the top of the separator enters the washing tower and is washed with water. The top of the tower is excess air and unreacted benzene, which can be recovered by adsorption. The aqueous solution at the bottom of the washing tower is sent to the dehydrator to separate the effluent, and the obtained crude maleic anhydride is sent to the crude maleic anhydride tank. The crude maleic anhydride is further sent into the distillation tower for distillation and refining to obtain maleic anhydride. The obtained Shandong maleic anhydride can be isomerized to fumaric acid and malic acid.

过去，工厂是通过苯或其他芳香族化合物的氧化来制备的。但随着部分材料上涨，工厂将使用正丁烷作为原料。苯和丁烷被送入热气流中，在高温下通过催化剂床层。然后，工作人员将对空气和碳氢化合物进行控制，从而降低混合物中发生火灾的可能性。其次，产品将通过出料口排出。

In the past, factories were prepared by oxidation of benzene or other aromatic compounds. However, as the price of some materials rises, the factory will use n-butane as raw material. Benzene and butane are fed into the hot gas stream and pass through the catalyst bed at high temperature. The staff will then control the air and hydrocarbons to reduce the possibility of fire in the mixture. Secondly, the product will be discharged through the discharge port.