順酐用于塑料工業(yè)用于制造增塑劑。造紙工業(yè)用于制造紙張?zhí)幚韯?。合成?shù)脂工業(yè)用于制造不飽和聚酯樹(shù)脂、醇酸樹(shù)脂等。涂料工業(yè)用于制造絕緣漆、白磁漆、烘漆、清漆等。
Maleic anhydride is used in the plastics industry to make plasticizers. The paper industry is used to manufacture 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.
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(zhǎng)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 pesticide industry is used to manufacture pesticide marathon and high efficiency and low toxicity pesticide 4049. It is used in the manufacture of long-acting sulfonamides in the pharmaceutical industry. The oil industry is used as a preservative for fats and oils. Organic industry is used to manufacture fumaric acid and tetrahydrofuran. Used as a chemical reagent in analytical chemistry.
將苯與空氣混合(苯為1%-1.4% )經(jīng)換熱器預(yù)熱后，進(jìn)人列管式催化反應(yīng)器。在壓力為0.1-0.2MPa、溫度為350-400℃的反應(yīng)條件下進(jìn)行氧化反應(yīng)，所得產(chǎn)物經(jīng)兩臺(tái)換熱器、一臺(tái)冷卻器后，冷卻到接近露點(diǎn)(55―65℃)。
Benzene is mixed with air (benzene is 1% - 1.4%) and preheated by heat exchanger before entering tubular catalytic reactor. The oxidation reaction is carried out under the reaction conditions of pressure 0.1-0.2mpa and temperature 350-400 ℃. The obtained product is cooled to close to the dew point (55-65 ℃) after passing through two heat exchangers and a cooler.
冷卻后的反應(yīng)物進(jìn)入分離器，分離器底部得粗順酐，進(jìn)入粗順酐罐。分離器頂部流出物進(jìn)人洗滌塔，用水洗滌，塔頂為多余空氣和未反應(yīng)的苯，苯可用吸附回收。洗滌塔塔底水溶液進(jìn)人脫水器，分離出水，所得粗順酐進(jìn)人粗順酐罐。粗順酐進(jìn)一步進(jìn)人蒸餾塔進(jìn)行蒸餾精制，得順酐。所得山東順酐可進(jìn)行異構(gòu)化得富馬酸和蘋果酸。
The cooled reactant enters the separator. Crude maleic anhydride is obtained at the bottom of the separator and enters the crude maleic anhydride tank. The effluent from the top of the separator enters the washing tower and is washed with water. The top of the tower is excess air and unreacted benzene, which can be recovered by adsorption. The aqueous solution at the bottom of the washing tower is sent to the dehydrator to separate the effluent, and the obtained crude maleic anhydride is sent to the crude maleic anhydride tank. The crude maleic anhydride is further sent into the distillation tower for distillation and refining to obtain maleic anhydride. The obtained Shandong maleic anhydride can be isomerized to fumaric acid and malic acid.
過(guò)去，工廠是通過(guò)苯或其他芳香族化合物的氧化來(lái)制備的。但隨著部分材料上漲，工廠將使用正丁烷作為原料。苯和丁烷被送入熱氣流中，在高溫下通過(guò)催化劑床層。然后，工作人員將對(duì)空氣和碳?xì)浠衔镞M(jìn)行控制，從而降低混合物中發(fā)生火災(zāi)的可能性。其次，產(chǎn)品將通過(guò)出料口排出。
In the past, factories were prepared by oxidation of benzene or other aromatic compounds. However, as the price of some materials rises, the factory will use n-butane as raw material. Benzene and butane are fed into the hot gas stream and pass through the catalyst bed at high temperature. The staff will then control the air and hydrocarbons to reduce the possibility of fire in the mixture. Secondly, the product will be discharged through the discharge port.
