顺酐，又称顺丁烯二酸酐，马来酸酐，2,5-呋喃二酮等。斜方晶系无色针状或片状晶体。有强烈刺激气味，溶于乙醇、丙酮，难溶于石油醚。与热水作用而成马来酸。主要用于生产不饱和聚酯树脂、醇酸树脂、长效碘胺的原料。

Maleic anhydride, also known as maleic anhydride, maleic anhydride, 2,5-furandione, etc. The rhombic crystal system is a colorless needle shaped or sheet-like crystal. Has a strong pungent odor, soluble in ethanol and acetone, but insoluble in petroleum ether. It reacts with hot water to form maleic acid. Mainly used as raw materials for producing unsaturated polyester resin, alkyd resin, and long-acting iodoamine.

也是涂料、马来松香、聚马来酐、顺酐-苯乙烯共聚物的共聚单体，也是生产油墨助剂、造纸助剂、增塑剂、酒石酸、富马酸、四氢呋喃等的有机化工原料。

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.

顺酐的主要生产方法有苯氧化法、丁烯氧化法和正丁烷氧化法，但仍以苯氧化法为主。1.苯氧化法苯在V-Mo-P系催化剂作用下，在固定床中发生氧化反应，生成顺丁烯二酸酐，反应温度为365℃（反应床层也可用沸腾床，但消耗高）。然后用水吸收生成顺丁烯二酸再经共沸脱水和精馏，刮片得到成品2.丁烷（或丁烯）氧化法丁烷（或丁烯）在V-Mo催化剂作用下，经空气或氧气氧化生成顺酐，反应温度350-400℃。

The main production methods of maleic anhydride include benzene oxidation, butene oxidation, and n-butane oxidation, but benzene oxidation is still the main method. 1. Benzene oxidation method: Benzene undergoes oxidation reaction in a fixed bed under the action of V-Mo-P catalyst, generating maleic anhydride at a reaction temperature of 365 ℃ (boiling bed can also be used for the reaction bed layer, but the consumption is high). Then, it is absorbed with water to generate maleic acid, which is then subjected to azeotropic dehydration and distillation, and scraped to obtain the finished product. 2. Butane (or butene) oxidation method: Butane (or butene) is oxidized to maleic anhydride by air or oxygen under the action of V-Mo catalyst, at a reaction temperature of 350-400 ℃.

然后再经水吸收，脱水和精制得到成品。

Then, it is absorbed by water, dehydrated, and refined to obtain the finished product.

顺酐的合成方法主要有苯氧化法、丁烯氧化法、丁烷氧化法等，目前生产上多数采用苯氧化法，即以苯为原料，经催化氧化得到顺酐。 采用固定床或沸腾床反应器，在V-Mo-P系催化剂作用下，用空气将苯氧化成顺丁烯二酸酐，反应温度为365℃。然后用水吸收生成顺丁烯二酸水溶液，再用二甲苯进行共沸蒸馏脱水得顺酐，后减压精馏得成品。

The synthesis methods of maleic anhydride mainly include benzene oxidation, butene oxidation, butane oxidation, etc. Currently, most production uses benzene oxidation method, which uses benzene as the raw material and catalyzes oxidation to obtain maleic anhydride. Using a fixed bed or fluidized bed reactor, benzene is oxidized to maleic anhydride with air under the action of V-Mo-P catalyst at a reaction temperature of 365 ℃. Then, water is absorbed to generate an aqueous solution of maleic acid, which is then subjected to azeotropic distillation and dehydration with xylene to obtain maleic anhydride. The final product is obtained by vacuum distillation.

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