順酐（簡稱MA）是順丁烯二酸酐的簡稱，又名馬來酸酐或失水蘋果酸酐；英文名：Mateicanhydride；分子式：C4H203；分子量：98.058；
Maleic anhydride (MA) is the abbreviation of maleic anhydride, also known as maleic anhydride or dehydrated malic anhydride; English Name: matericanhydride; Molecular formula: c4h203; Molecular weight: 98.058;
順酐是一種常用的重要基本有機化工原料,是世界上僅次于醋酐和苯酐的第三大酸酐原料。
Maleic anhydride is an important basic organic chemical raw material, which is the third largest anhydride raw material in the world after acetic anhydride and phthalic anhydride.
順酐主要用于生產不飽和聚酯樹脂（UPR）、醇酸樹脂。此外，以順酐為原料還可以生產1，4-丁二醇（BOD）、γ-丁內酯（GBL）、四氫呋喃（THF）、馬來酸、富馬酸和四氫酸酐等一系列用途廣泛的精細化工產品，在農藥、醫藥、涂料、油墨、潤滑油添加劑、造紙化學品、紡織品整理劑、食品添加劑以及表面活性劑等領域具有廣泛的應用。
Maleic anhydride is mainly used to produce unsaturated polyester resin (UPR) and alkyd resin. In addition, 1,4-butanediol (BOD) can be produced from maleic anhydride γ- Butyrolactone (GBL), tetrahydrofuran (THF), maleic acid, fumaric acid and tetrahydroanhydride are a series of widely used fine chemical products, which are widely used in the fields of pesticide, medicine, coating, ink, lubricant additive, paper chemicals, textile finishing agent, food additive and surfactant.
上工業化生產順酐的工藝路線主要為正丁烷法氧化法，其次為苯氧化法，我國主要采用苯氧化法。
In the world, n-butane oxidation is the main process for the industrial production of maleic anhydride, followed by benzene oxidation. In China, benzene oxidation is the main process.
近年來，我國順酐的表觀消費量不斷增加。無論是我國順酐的生產技術，還是生產能力都得到了很大的發展，但是與國外^相比還存在一些問題。
In recent years, the apparent consumption of maleic anhydride in China is increasing. Both the production technology and production capacity of maleic anhydride in China have been greatly developed, but there are still some problems compared with foreign countries.
順酐基本理化性質：
The basic physical and chemical properties of maleic anhydride are as follows
順丁烯二酸酐系白色斜方形針狀結晶，分子式C4H203，分子量98.06，熔點52.8℃，沸點202℃，相對密度1.314，閃點103℃，易升華。順酐易溶于水、醇和酯，微溶于四氯化碳和粗汽油。順酐的粉塵和蒸汽均易燃易爆，對人有刺激，而且會燒傷人體皮膚。
Maleic anhydride is white orthorhombic acicular crystal, molecular formula c4h203, molecular weight 98.06, melting point 52.8 ℃, boiling point 202 ℃, relative density 1.314, flash point 103 ℃, easy sublimation. Maleic anhydride is easily soluble in water, alcohol and ester, slightly soluble in carbon tetrachloride and crude gasoline. Maleic anhydride dust and steam are flammable and explosive, irritating to people, and can burn human skin.
順酐的貯存及運輸等：
Storage and transportation of maleic anhydride
工業順酐產品包裝一般采用聚丙烯編織袋，內襯聚乙烯塑料袋。每袋凈重25kg。或20′集裝箱可裝18噸（打托盤）或20噸（不打托盤）。850Kg塑編袋20′集裝箱可裝17噸（打托盤）。
Industrial maleic anhydride products are generally packed in polypropylene woven bags lined with polyethylene plastic bags. The net weight of each bag is 25kg. Or 20 'container can hold 18 tons (palletized) or 20 tons (no palletized). 850kg plastic woven bag 20 'container can hold 17 tons (pallets).
順酐應貯存于干燥通風的庫房內，防火、防潮、防雨淋、防日曬，貯存期三個月—壹年。在貯存運輸過程中勿與酸、堿混放，避免與氧化、腐蝕性物質接觸，以免產品變質，運輸時注意小心輕放，防止包裝袋破損。
Maleic anhydride should be stored in a dry and ventilated warehouse, fireproof, moisture-proof, rain proof and sun proof, with a storage period of three months to one year. In the process of storage and transportation, do not mix with acid and alkali, avoid contact with oxidizing and corrosive substances, so as to avoid product deterioration. Pay attention to handle with care during transportation, so as to prevent damage of packaging bag.
順酐屬低毒類。在工業使用中應嚴格防止污染皮膚和眼睛，加強通風。盡量避免呼吸道吸入。
Maleic anhydride is of low toxicity. In industrial use, skin and eyes pollution should be strictly prevented, and ventilation should be strengthened. Try to avoid respiratory inhalation.
