顺丁烯二酸酐又名马来酸酐或失水苹果酸酐，常简称顺酐。无色结晶，有强烈刺激气味，凝固点52.8℃，沸点202℃,易升华。主要由苯或碳四馏分中的正丁烷或丁烯氧化而制得，是生产不饱和聚酯及有机合成的原料。
Maleic anhydride, also known as maleic anhydride or dehydrated malic anhydride, is often referred to as maleic anhydride. Colorless crystal, strong pungent smell, freezing point 52.8 ℃, boiling point 202 ℃, easy to sublimate. It is mainly prepared by oxidation of n-butane or butene in benzene or C4 fraction. It is a raw material for the production of unsaturated polyester and organic synthesis.
顺丁烯二酸酐的制备方法
Preparation of maleic anhydride
顺酐的主要生产方法有苯氧化法、丁烯氧化法和正丁烷氧化法，但仍以苯氧化法为主。1.苯氧化法苯在V-Mo-P系催化剂作用下，在固定床中发生氧化反应，生成顺丁烯二酸酐，反应温度为365℃（反应床层也可用沸腾床，但消耗高）。然后用水吸收生成顺丁烯二酸，再经共沸脱水和精馏，刮片得到成品。2.丁烷（或丁烯）氧化法丁烷（或丁烯）在V-Mo催化剂作用下，经空气或氧气氧化生成顺酐，反应温度350-400℃。然后再经水吸收，脱水和精制得到成品。
The main production methods of maleic anhydride include benzene oxidation, butene oxidation and n-butane oxidation, but benzene oxidation is still the main method. 1. Benzene oxidation reaction of benzene in the presence of v-mo-p catalyst in a fixed bed to produce maleic anhydride at 365 ℃ (the reaction bed layer can also be used in boiling bed, but the consumption is high). Then, maleic acid is formed by absorption with water, and then the product is obtained by azeotropic dehydration and distillation. 2. Butane (or butene) oxidation method butane (or butene) is oxidized by air or oxygen in the presence of v-mo catalyst, and the reaction temperature is 350-400 ℃. Then the product is absorbed by water, dehydrated and refined.
顺丁烯二酸酐的用途
Application of maleic anhydride
塑料工业用于制造增塑剂。造纸工业用于制造纸张处理剂。合成树脂工业用于制造不饱和聚酯树脂、醇酸树脂等。涂料工业用于制造绝缘漆、白磁漆、烘漆、清漆等。农药工业用于制造农药马拉松和低毒农药4049等。医药工业用于制造长效磺胺药。油脂工业用作脂肪、油的防腐剂。有机工业用于制造富马酸及四氢呋喃等。分析化学中用作化学试剂。
The plastics industry is used to make plasticizers. It is used in papermaking industry. Synthetic resin industry is used to manufacture unsaturated polyester resin, alkyd resin and so on. The coating industry is used to manufacture insulating paint, white enamel, baking paint, varnish, etc. Pesticide industry is used to manufacture pesticide marathon and 4049, etc. The pharmaceutical industry is used to manufacture long-acting sulfonamides. Oil industry is used as preservative of fat and oil. Organic industry is used to produce fumaric acid and tetrahydrofuran. Used as a chemical reagent in analytical chemistry.
