Maleic anhydride, also known as maleic anhydride (MAH), is the anhydride of maleic acid. It is a colorless or white solid with sour taste at room temperature, and the molecular formula is c4h2o3. Maleic anhydride was previously prepared by catalytic oxidation of benzene, but now it is mostly prepared by n-butane oxidation: 2ch3ch2ch2ch3 + 7o2 → 2c2h2 (CO) 2O + 8H2O

马来酸酐又称顺丁烯二酸酐(MAH)，简称顺酐，是顺丁烯二酸的酸酐，室温下为有酸味的无色或白色固体，分子式为C4H2O3。

Maleic anhydride, also known as maleic anhydride (MAH), is the anhydride of maleic acid. It is a colorless or white solid with sour taste at room temperature, and the molecular formula is c4h2o3.

顺丁烯二酸酐以前用苯的催化氧化制备，但由于的缘故，现在大多用正丁烷氧化法制
取:2CH3CH2CH2CH3+7O2→2C2H2(CO)2O+8H2O

Maleic anhydride was previously prepared by catalytic oxidation of benzene, but now it is mostly prepared by n-butane oxidation: 2ch3ch2ch2ch3 + 7o2 → 2c2h2 (CO) 2O + 8H2O

顺丁烯二酸酐可发生的反应有:

The reactions of maleic anhydride include:

水解生成顺丁烯二酸(cis-HO2CCH=CHCO2H)，1:1醇解生成单酯:cis-HO2CCH=CHCO2CH3;用作狄尔斯-阿尔德反应中的亲双烯体;与低价金属配位，配合物的例子如Pt(PPh3)2(MA)及Fe(CO)4(MA)。

Maleic acid (cis-ho2cch = chco2h) is produced by hydrolysis, and monoester is produced by 1:1 alcoholysis: cis-ho2cch = chco2ch3; Used as dienophile in Diels alder reaction; Examples of complexes coordinated with low valent metals are Pt (PPh3) 2 (MA) and Fe (CO) 4 (MA).

下面我们来看看马来酸酐的用途

Let's look at the use of maleic anhydride

1.用作1,4-丁二醇、γ-丁内酯、琥珀酸、不饱和聚酯树脂、醇酸树脂等的原料，也用于医药和农药。

1. Used to produce 1,4-butanediol γ- Butyrolactone, succinic acid, unsaturated polyester resin, alkyd resin and other raw materials are also used in medicine and pesticides.

2.金属选矿中充当捕收剂

2. Act as collector in metal beneficiation

3.用于有机合成，也用作合成纤维中间体

3. It is used in organic synthesis and also as an intermediate of synthetic fiber

4.马来酸酐是一种重要的不饱和有机酸酐基本原料，在农药上用于合成有机磷杀虫剂的中间体顺丁烯二酸二乙酯、哒嗪硫磷的中间体1-苯基-3，6-二羟基哒嗪，以及拟除虫菊酯杀虫剂胺菊酯、剂、克菌丹的中间体，此外，还用于不饱和聚酯树脂、油墨助剂、造纸助剂、涂料以及医药工业、食品工业等。

4. Maleic anhydride is an important basic raw material of unsaturated organic anhydride. In pesticide production, maleic anhydride is used to synthesize diethyl maleate, the intermediate of pyridazinon, 1-phenyl-3,6-dihydroxypyridazine, and the intermediate of pyrethroid insecticide fenpropathrin, fungicide and captan. In addition, it is also used to produce unsaturated polyester resin Ink additives, papermaking additives, coatings, pharmaceutical industry, food industry, etc.

5.主要用于不饱和聚酯树脂、醇酸树脂、农药、低毒农药4049、长效碘胺的原料。也是涂料、马来松香、聚马来酐、顺酐-苯乙烯共聚物。也是油墨助剂、造纸助剂、增塑剂和酒石酸、富马酸等的有机化工原料。

5. It is mainly used to produce unsaturated polyester resin, alkyd resin, pesticide, low toxic pesticide 4049 and long-acting iodamine. It is also a coating, maleic rosin, polymaleic anhydride, maleic anhydride styrene copolymer. It is also an organic chemical raw material for the production of ink additives, papermaking additives, plasticizers, tartaric acid, fumaric acid, etc.

6.马来酸酐(108-31-6)是一种常用的重要基本有机化工原料。是世界上仅次于醋酐和苯酐的第三大酸酐原料。其下游产品有着相当广泛的开发和应用前景。主要用于合成不饱和聚酯树酯，它是制造汽车部件、船舶、耐腐蚀性化工设备和日用品的原料。马来酸酐(108-31-6)也是润滑油的添加剂、涂料、农药、富马酸、共聚物、食品添加剂等重要中间体。其加氢衍生物有琥珀酸酐、1.4-丁二醇、r-J内酯。

6. Maleic anhydride (108-31-6) is a common and important basic organic chemical raw material. It is the third largest anhydride raw material in the world after acetic anhydride and phthalic anhydride. Its downstream products have a wide range of development and application prospects. It is mainly used to synthesize unsaturated polyester resin. It is the raw material for manufacturing automobile parts, ships, corrosion-resistant chemical equipment and daily necessities. Maleic anhydride (108-31-6) is also an important intermediate for the production of lubricating oil additives, coatings, pesticides, fumaric acid, copolymers, food additives and so on. Its hydrogenation derivatives include succinic anhydride, 1.4-butanediol and R-J lactone.