Preparation of Maleic Anhydride from Partial Oxidation of Benzene using Aspen HYSYS

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Maleic Anhydride is organic compound of carbon, oxygen and hydrogen. It is liquid at room temperature. It can be prepared from either partial oxidation of normal butane or by partial oxidation of benzene. The preparation of maleic anhydride from benzene partial oxidation is old process and has some negative impact on environment due carcinogenic nature of benzene. This method has high energy requirement and has low efficiency as compared to the normal butane partial oxidation process for MAN manufacturing.
In this method the heated benzene and compressed oxygen enter to a packed bed reactor to convert benzene in to maleic anhydride, water and carbon dioxide. The maleic anhydride preparation reaction is highly exothermic reaction and it is taking placing in packed bed reactor. The catalyst used in PBR is vanadium pentoxide supported on molebdnium trioxide. The properties of catalyst are given to us.
After reaction the products of the reaction are cooled to decrease its temperature before entering to the absorption column. In the absorption column the product of reaction is flowing from the bottom while pure Dibutylphatalite is entering from the top to absorb MAN from dirty gases.
The bottom of absorption column is then pass through distillation column to separate MAN from DBP . The top distillate is about 98% MAN, while the bottom product of the distillation column is pure DBP.
Fired heated is also used increase temperature of stream. In this fired heater natural burned in the presence of excess air to produce combustion products. It can be further converted into less harmful substances in a conversion reactor.
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