順丁烯二酸酐又名馬來酸酐或失水蘋果酸酐，常簡稱順酐。無色結(jié)晶，有強烈刺激氣味，凝固點52.8℃，沸點202℃,易升華。主要由苯或碳四餾分中的正丁烷或丁烯氧化而制得，是不飽和聚酯及有機合成的原料。
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.
順丁烯二酸酐的制備方法
Preparation of maleic anhydride
順酐的主要方法有苯氧化法、丁烯氧化法和正丁烷氧化法，但仍以苯氧化法為主。1.苯氧化法苯在V-Mo-P系催化劑作用下，在固定床中發(fā)生氧化反應，生成順丁烯二酸酐，反應溫度為365℃（反應床層也可用沸騰床，但消耗高）。然后用水吸收生成順丁烯二酸，再經(jīng)共沸脫水和精餾，刮片得到成品。2.丁烷（或丁烯）氧化法丁烷（或丁烯）在V-Mo催化劑作用下，經(jīng)空氣或氧氣氧化生成順酐，反應溫度350-400℃。然后再經(jīng)水吸收，脫水和精制得到成品。
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.
順丁烯二酸酐的用途
Application of maleic anhydride
塑料工業(yè)用于制造增塑劑。造紙工業(yè)用于制造紙張?zhí)幚韯?。合成樹脂工業(yè)用于制造不飽和聚酯樹脂、醇酸樹脂等。涂料工業(yè)用于制造絕緣漆、白磁漆、烘漆、清漆等。農(nóng)藥工業(yè)用于制造農(nóng)藥馬拉松和低毒農(nóng)藥4049等。醫(yī)藥工業(yè)用于制造長效磺胺藥。油脂工業(yè)用作脂肪、油的防腐劑。有機工業(yè)用于制造富馬酸及四氫呋喃等。分析化學中用作化學試劑。
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.
