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 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 price. The maleic anhydride manufacturer will talk about the synthesis method of maleic anhydride and precautions for storage and transportation.
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办法，工艺技术成熟牢靠。
Benzene vapor and air (or oxygen) take V2O5-MnO3 as active components, α- Maleic anhydride is produced by gas-phase oxidation reaction on the catalyst supported by Al2O3. Benzene oxidation is the traditional production method of maleic anhydride, and the process technology is mature and reliable.
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。
This method uses the effective components of mixed C4 fraction, such as n-butene and butadiene, as raw materials, and air (or oxygen), to produce maleic anhydride through gas-phase oxidation reaction under the action of V2O5-P2O5 system catalyst, wherein n-butene is dehydrogenated to produce butadiene in the reaction process, and then oxidized to produce maleic anhydride. In the reaction process, in addition to the main products, carbon monoxide, carbon dioxide and water as well as a small amount of acetaldehyde, acetic acid, acrolein and furan are also generated as by-products. The unit consumption of raw materials is high and the yield is low. 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，能够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 products can be obtained as a 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 the organic matter is removed by the washing tower. The washing liquid is maleic anhydride and a small amount of benzoic acid, phthalic acid and other impurities. The product of maleic anhydride is obtained after concentration, refining and heating dehydration.
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。该工艺自1974年由美国孟山都公司实现工业化以来，由于原料价廉、对环境污染小以及欧美等正丁烷资源丰盛等起因而得到迅速的发展，代表了顺酐生产工艺的发展趋势。
The n-butane oxidation process takes n-butane as the raw material, and generates maleic anhydride through gas-phase oxidation reaction under the action of V2O5-P2O5 catalyst. Since its industrialization by Monsanto in 1974, the process has developed rapidly due to the low cost of raw materials, low environmental pollution and abundant n-butane resources in Europe, America and other countries, representing the development trend of maleic anhydride production process.
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. Precautions for transportation: the package shall be complete and the loading shall be stable during shipment. During transportation, ensure that the container does not leak, collapse, fall or damage. It is forbidden to mix and transport with oxidants, reducing agents, acids, edible chemicals, etc. During transportation, it shall be protected from sunshine, rain and high temperature;
2、储存注意事项：储存于阴凉、干燥、通风良康复的库房。远离火种、热源。保持容器密封。应与氧化剂、还原剂、酸类、食用化学品离开寄存，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. Precautions for storage: Store in a cool, dry, well-ventilated warehouse. Keep away from kindling and heat sources. Keep container sealed. It should be stored away from oxidants, reducing agents, acids and edible chemicals, and should not be stored together. Provide fire fighting equipment of corresponding types and quantities. The storage area shall be equipped with appropriate materials to contain the leakage;
3、包装注意事项：化工中间体（氟草烟甲酯）农药中间体袋或二层牛皮纸袋外全开口或中开口钢桶；化工中间体（氟草烟甲酯）农药中间体袋或二层牛皮纸袋外纤维板桶、胶合板桶、硬纸板桶；化工中间体（氟草烟甲酯）农药中间体袋外化工中间体（氟草烟甲酯）农药中间体桶（固体）；化工中间体（氟草烟甲酯）农药中间体桶（液体）。
3. Precautions for packaging: chemical intermediate (fluorouracil methyl ester) pesticide intermediate bag or two-layer kraft paper bag with full or middle opening steel drum; Chemical intermediate (methyl fluorouracil) pesticide intermediate bag or fiberboard barrel, plywood barrel and cardboard barrel outside the two-layer kraft paper bag; Chemical intermediate (fluorofenicol methyl ester) pesticide intermediate out-of-bag chemical intermediate (fluorofenicol methyl ester) pesticide intermediate barrel (solid); Chemical intermediate (methyl fluorouracil) pesticide intermediate barrel (liquid).
The synthesis method of maleic anhydride and the precautions for storage and transportation will be explained here. Before operating the product, you must do a good job in the relevant safety precautions, put your own safety first, and then guarantee the quality of use. Come to our website for more matters http://www.jnjhhg.cn consulting service
