Through the recent market survey and return visits, we found that many customers did not understand the preparation method of Shandong maleic anhydride
. Today, the editor will share the relevant information with you, hoping to attract everyone's attention and let everyone pay attention to Shandong. Maleic anhydride has a deep understanding. In this way, everyone can be sure when buying and using Shandong maleic anhydride, not afraid of being deceived, I hope to inspire and help everyone.
Benzene oxidation to Shandong maleic anhydride
After mixing benzene with air (1% -1.4% of benzene), it is preheated by a heat exchanger and then enters a tubular catalytic reactor. The oxidation reaction is carried out under the reaction conditions of a pressure of 0.1-0.2 MPa and a temperature of 350-400 ° C. The obtained product is cooled to near the dew point (55-65 ° C) after passing two heat exchangers and a cooler. The cooled reactants enter the separator, and 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 a washing tower and is washed with water. The top of the tower is excess air and unreacted benzene. Benzene can be recovered by adsorption. The aqueous solution at the bottom of the washing tower is introduced into a dehydrator to separate water, and the obtained crude maleic anhydride is introduced into a crude maleic anhydride tank. The crude maleic anhydride is further fed into a distillation column for distillation and purification to obtain maleic anhydride. The obtained Shandong maleic anhydride can be isomerized to obtain fumaric acid and malic acid.
2. Partial oxidation of C 4 fractions to maleic anhydride Industrially, maleic anhydride is produced from C 4 fractions without separation or C 4 fractions after isobutene and butadiene separation. The C 4 fraction is mixed with air and enters a fluidized bed oxidation reactor, and is contacted with a catalyst in the reactor to produce maleic anhydride at a temperature of 300-500 ° C. The reaction product flowing out of the top of the oxidation reactor enters the absorption tower, and water is used as an absorbent.
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