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。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。下面
顺酐生产厂家来讲讲马来酸酐的合成方法及储运注意事项。
Maleic anhydride, also known as Maleic anhydride (MAH), is the acid anhydride of maleic acid. It is a colorless or white solid with sour taste at room temperature, and its Molecular formula is C4H2O3. Maleic anhydride was previously prepared by catalytic oxidation of benzene, but now it is mostly prepared by n-butane oxidation due to the price. Next, the maleic anhydride manufacturer will talk about the synthesis method of maleic anhydride and precautions for storage and transportation.
马来酸酐的合成方法
Synthesis of Maleic Anhydride
1、苯氧化法
1. Benzene oxidation method
苯蒸气和空气（或氧气）在以V2O5－MnO3等为活性组分，α-Al2O3为载体的催化剂上发生气相氧化反应生成顺酐。苯氧化法是生产顺酐的传统生产方法，工艺技术成熟可靠，其中以SD法应用为普及。
Benzene vapor and air (or oxygen) are active components such as V2O5-MnO3, α- Gas phase oxidation reaction occurs on the catalyst supported by Al2O3 to generate maleic anhydride. The benzene oxidation method is a traditional production method for maleic anhydride, with mature and reliable process technology, among which the SD method is widely used.
2、C4烯烃法
2. C4 olefin method
该法是以混合C4馏分中的有效成分正丁烯、丁二烯等为原料，和空气（或氧气），在V2O5－P2O5系催化剂作用下经气相氧化反应生成顺酐，其中正丁烯在反应过程中先脱氢生成丁二烯，再氧化生成顺酐。在反应过程中，除生成主产物外，还副产生成一氧化碳、二氧化碳和水以及少量的乙醛、乙酸、丙烯醛和呋喃等，原料单耗高，收率低，该法已经逐渐被淘汰。
In this method, n-butene, butadiene and other Active ingredient in the mixed C4 fraction are used as raw materials, and air (or oxygen) is used to generate maleic anhydride through gas-phase oxidation reaction under the action of V2O5-P2O5 system catalyst. In the reaction process, n-butene is dehydrogenated first to generate butadiene, and then oxidized to generate maleic anhydride. In the reaction process, in addition to the main product, carbon monoxide, carbon dioxide, water and a small amount of acetaldehyde, acetic acid, Acrolein and furan are also produced as by-products. With high unit consumption of raw materials and low yield, this method has been gradually eliminated.
3、苯酐副产法
3. Phthalic anhydride by-product method
在由邻二甲苯生产苯酐时，可以副产得到一定数量的顺酐产品，其产量约为苯酐产量的5%。在苯酐生产中，反应尾气经洗涤塔除去有机物后排放到大气中，洗涤液为顺酐和少量的苯甲酸、苯二甲酸等杂质，经浓缩精制和加热脱水后得到顺酐产品。
When phthalic anhydride is produced from O-Xylene, a certain amount of maleic anhydride can be obtained by by-product, and its output is about 5% of that of phthalic anhydride. In the production of phthalic anhydride, the reaction tail gas is discharged into the atmosphere after removing organic matter through a washing tower. The washing solution consists of maleic anhydride and a small amount of impurities such as benzoic acid and phthalic acid. After concentration, refinement, and heating dehydration, the product of maleic anhydride is obtained.
4、正丁烷氧化法
4. N-butane oxidation method
正丁烷氧化工艺是以正丁烷为原料，在V2O5-P2O5系催化剂作用下发生气相氧化反应生成顺酐。
The n-butane oxidation process takes n-butane as the raw material and undergoes a gas-phase oxidation reaction to produce maleic anhydride under the action of V2O5-P2O5 catalyst.
马来酸酐储运注意事项
Precautions for storage and transportation of maleic anhydride
1、运输注意事项：起运时包装要完整，装载应稳妥。运输过程中要确保容器不泄漏、不倒塌、不坠落、不损坏。严禁与氧化剂、还原剂、酸类、食用化学品等混装混运。运输途中应防曝晒、雨淋，防高温；
1. Transportation precautions: The packaging should be complete during transportation and the loading should be stable. During transportation, it is necessary to ensure that the container does not leak, collapse, fall, or be damaged. It is strictly prohibited to mix and transport oxidants, reducing agents, acids, edible chemicals, etc. During transportation, it is necessary to prevent exposure to sunlight, rain, and high temperatures;
2、储存注意事项：储存于阴凉、干燥、通风良好的库房。远离火种、热源。保持容器密封。应与氧化剂、还原剂、酸类、食用化学品分开存放，切忌混储。配备相应品种和数量的消防器材。储区应备有合适的材料收容泄漏物；
2. Storage precautions: Store in a cool, dry, and well ventilated warehouse. Keep away from sparks and heat sources. Keep the container sealed. It should be stored separately from oxidants, reducing agents, acids, and edible chemicals, and should not be mixed for storage. Equip corresponding types and quantities of fire-fighting equipment. The storage area should be equipped with suitable materials to contain leaks;
3、包装注意事项：塑料袋或二层牛皮纸袋外全开口或中开口钢桶；塑料袋或二层牛皮纸袋外纤维板桶、胶合板桶、硬纸板桶；塑料袋外塑料桶（固体）；塑料桶（液体）。
3. Packaging precautions: full opening or middle opening steel drum outside the plastic bag or two-layer kraft paper bag; Fiberboard barrels, plywood barrels and cardboard barrels outside plastic bags or two-layer Kraft paper bags; Plastic bucket (solid) outside the plastic bag; Plastic bucket (liquid).
That's all for the synthesis method of maleic anhydride and precautions for storage and transportation. I hope I can give you some help. Please come to our website for more information http://www.jnjhhg.cn consulting service
