順丁烯二酸酐的制備方法
Preparation of maleic anhydride
順酐的主要生產(chǎn)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(yīng)，生成順丁烯二酸酐，反應(yīng)溫度為365℃（反應(yīng)床層也可用沸騰床，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(yīng)溫度350-400℃。然后再經(jīng)水吸收，脫水和精制得到成品。
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.
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：铣蓸渲I(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。
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.
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(jī)工業(yè)用于制造富馬酸及四氫呋喃等。分析化學(xué)中用作化學(xué)試劑。
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.
