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說到順酐可能很多人不太清楚，聽起來有點陌生，今天小編給你詳細介紹一下順酐。順酐是一種大宗原料，那你知道它的由來嗎？
Speaking of maleic anhydride, many people may not be familiar with it and it may sound a bit unfamiliar. Today, the editor will give you a detailed introduction to maleic anhydride. Maleic anhydride is a bulk raw material, do you know its origin?
順酐全名為順丁烯二酸酐，又稱為馬來酸酐，是一種有強烈刺激氣味的無色結晶粉末，于1834年由蘋果酸得到。早期，順丁烯二酸酐是通過苯的催化氧化制備，但為了降低成本，改用正丁烷氧化法制取。順酐由苯經催化氧化或由丁烯或丁烷用空氣氧化而制得，溶于乙醇、乙醚和丙酮，難溶于石油醚和四氯化碳，與熱水作用而成馬來酸；
Maleic anhydride, also known as maleic anhydride, is a colorless crystalline powder with a strong pungent odor. It was first obtained from malic acid in 1834. In the early days, maleic anhydride was prepared by catalytic oxidation of benzene, but in order to reduce production costs, the n-butane oxidation method was used instead. Maleic anhydride is produced by catalytic oxidation of benzene or air oxidation of butene or butane. It is soluble in ethanol, ether, and acetone, but insoluble in petroleum ether and carbon tetrachloride. It reacts with hot water to form maleic acid;
順酐的外觀是白色片狀結晶，有粉末狀、針狀、片狀、丸狀、棒狀、團塊狀或熔融物質，相對密度是1.480，熔點在52.8℃，沸點是202.2℃，閃點：110.0℃。
The appearance of maleic anhydride is white plate-like crystals, which can be in the form of powder, needle, flake, pellet, rod, lump or molten substance. The relative density is 1.480, the melting point is 52.8 ℃, the boiling point is 202.2 ℃, and the flash point is 110.0 ℃.
順酐的作用：用于雙烯合成、制藥物、農藥、染料中間體及制聚酯樹脂、醇酸樹脂、馬來酸等有機酸，也用作脂肪和油防腐劑等，不飽和聚酯樹脂、醇酸樹脂、、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、四氫呋喃等的有機化工原料。
The function of maleic anhydride: It is used in the synthesis of diene, the production of pharmaceuticals, pesticides, dye intermediates, and the production of organic acids such as polyester resins, alkyd resins, and maleic acid. It is also used as a preservative for fats and oils, and is a raw material for the production of unsaturated polyester resins, alkyd resins, and long-acting iodeamines. It is also a copolymer monomer of coatings, maleic anhydride, maleic anhydride styrene copolymer, and an organic chemical raw material for the production of ink additives, papermaking additives, plasticizers, tartaric acid, fumaric acid, tetrahydrofuran, etc.
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