1.苯氧化成山東順酐
1. Oxidation of benzene to maleic anhydride
加熱到管狀催化反應器后，苯通過熱交換器與空氣混合。氧化反應在0.1-0.2MPa壓力和350-400℃溫度的反應條件下進行。產生的產品通過兩個熱交換器和一個冷卻器，冷卻到露點附近(55-65℃)。冷卻反應物進入分離器，分離器底部得到粗馬來酸酐并進入粗順酐槽。
After heating to the tubular catalytic reactor, the benzene is mixed with the air through the superheater. The oxidation reaction was carried out under the pressure of 0.1-0.2mpa and temperature of 350-400 ℃. The product is cooled to the dew point (55-65 ℃) by two heat exchangers and a cooler. The cooled reactant enters the separator, and the crude maleic anhydride is obtained at the bottom of the separator and enters the crude maleic anhydride tank.
分離器的頂部流出物被送入洗滌塔并用水洗滌。空氣頂部和未反應的苯可以通過吸附回收。洗滌塔底部的水溶液被送入脫水器，水被分離，產生的順酐被送入粗馬來酸酐罐。粗馬來酸酐進一步進入蒸餾塔進行蒸餾和精煉，以獲得順酐。由此產生的山東順酐可以異構化得到富馬酸和蘋果酸。
The effluent from the top of the separator is sent to the scrubber and washed with water. The air top and unreacted benzene can be recovered by adsorption. The water solution at the bottom of the washing tower is sent to the dehydrator, the water is separated, and the maleic anhydride produced is sent to the crude maleic anhydride tank. The crude maleic anhydride is further distilled and refined in a distillation tower to obtain maleic anhydride. The resulting maleic anhydride can be isomerized to give fumaric acid and malic acid.
2.C4部分氧化成順酐
2. Partial oxidation of C4 to maleic anhydride
順酐的工業生產，使用不分離的C4部分或異丁烯和丁二烯分離后的C4部分作為原料。C4餾分與空氣混合，然后送入人流化床氧化反應器，并在300-500℃的溫度下與反應器中的催化劑接觸，產生馬來酸酐。氧化反應器頂部的反應產物進入吸收塔，水作為吸收劑，頂部氣體通過廢水。
In the industrial production of maleic anhydride, the C4 part without separation or the C4 part after separation of isobutylene and butadiene are used as raw materials. C4 fraction is mixed with air, and then sent to a fluidized bed oxidation reactor, which contacts with the catalyst in the reactor at 300-500 ℃ to produce maleic anhydride. The reaction products at the top of the oxidation reactor enter the absorption tower, water acts as absorbent, and the top gas passes through the waste water.
