When using maleic anhydride, it is necessary to prevent fireworks, high temperature, sunlight, humidity, violent impact and contact with skin. Keep away from fire, oxidant and food. The following potassium hydroxide manufacturer will talk about the reaction performance of two oxidation to maleic anhydride.
Reaction of Benzene Oxidation to Maleic Anhydride
The benzene is mixed with air (benzene is 1% - 1.4%), preheated by the heat exchanger, and then enters the tubular catalytic reactor. The oxidation reaction is carried out under the reaction conditions of 0.1-0.2MPa pressure and 350-400 ℃ temperature. The product is cooled to close to the dew point (55-65 ℃) after passing through two heat exchangers and one cooler. The cooled reactants enter the separator, and the crude maleic anhydride obtained at the bottom of the separator enters the crude maleic anhydride tank.
The effluent from the top of the separator enters the scrubber and is washed with water. The top of the scrubber contains excess air and unreacted benzene, which can be recovered by adsorption. The water solution at the bottom of the scrubber enters the dehydrator, the effluent is separated, and the obtained crude maleic anhydride enters the crude maleic anhydride tank. The crude maleic anhydride is further fed into the distillation tower for distillation and refining to obtain maleic anhydride. The obtained maleic anhydride can be isomerized to obtain fumaric acid and malic acid.
Partial Oxidation of C4 Fraction to Maleic Anhydride
In industry, maleic anhydride is produced from C4 fraction without separation or C4 fraction after isobutene and butadiene separation. The process flow of partial oxidation of C4 fraction to maleic anhydride is shown in the figure below. C4 fraction is mixed with air and then enters the fluidized bed oxidation reactor. At the temperature of 300-500 ℃, it contacts with the catalyst in the reactor to produce maleic anhydride.
The reaction products from the top of the oxidation reactor enter the absorption tower, and water is used as the absorbent. The gas from the tower top is discharged after passing through the wastewater treatment tower. The water solution at the bottom of the absorption tower enters the dehydration tower for concentration and dehydration, and then enters the refining tower for simple distillation to obtain maleic anhydride.
Compared with the oxidation of benzene to maleic anhydride, the partial oxidation of C4 fraction to maleic anhydride has the advantages of low raw material cost and long catalyst life. However, the selectivity of maleic anhydride is low and the investment cost is large.
In addition, the packaging of maleic anhydride products should be sealed, with obvious signs of "corrosive articles". Personal safety should be the priority. More relevant matters can be found on our website http://www.xhczhushu.com consulting service