Preparation of maleic anhydride

顺酐的主要方法有苯氧化法、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）。

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 is oxidized to maleic anhydride in fixed bed under the action of v-mo-p catalyst. The reaction temperature is 365 ℃ (the reaction bed can also be fluidized bed, but the consumption is high).

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。

Then, maleic acid is absorbed with water to form maleic acid, which is then dehydrated by azeotrope, rectified and scraped to obtain the finished product. 2. Butane (or butene) oxidation method butane (or butene) is oxidized to maleic anhydride by air or oxygen in the presence of v-mo catalyst, and the reaction temperature is 350-400 ℃. Then the product is obtained by water absorption, dehydration and refining.

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。

The plastics industry is used to make plasticizers. The paper industry is used to make paper treatment agents. Synthetic resin industry is used to manufacture unsaturated polyester resin, alkyd resin, etc. The coating industry is used to manufacture insulating paint, white enamel, baking paint, varnish, etc. The pesticide industry is used to manufacture pesticide marathon and 4049, etc.

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 pharmaceutical industry is used to manufacture long-acting sulfonamides. Oil industry is used as preservative of fat and oil. The organic industry is used to produce fumaric acid and tetrahydrofuran. Used as a chemical reagent in analytical chemistry.