Maleic Anhydride Production Technology (RHMA)
Maleic anhydride is one of the three major acid anhydride raw materials in the world (acetic anhydride, maleic anhydride, phthalic anhydride), and its downstream products have a wide range of development and application prospects, which can be used in synthetic resins, coatings, pesticides, lubricant additives, medicine, and paper Treatment agents, food additives, stabilizers, etc.
At present, maleic anhydride production technologies mainly include butane process and benzene process. At present, the production capacity of maleic anhydride in my country is dominated by the traditional benzene process, but with the advancement of the utilization of carbon four resources, the butane process maleic anhydride plant has gradually formed a scale.
Ruihua maleic anhydride technology uses n-butane as raw material to produce maleic anhydride by reacting with air. The oxidation reaction is a strongly exothermic reaction, and the heat of reaction needs to be removed during the reaction process, so the maleic anhydride device can output a large amount of steam to the outside. Because of this feature, the maleic anhydride device is suitable for joint installation with some devices with high steam consumption, such as the ethyl styrene styrene device, which can achieve the purpose of steam complementation and improve the economic efficiency of the two devices.
Compared with traditional benzene maleic anhydride technology, RHMA technology can completely eliminate benzene's environmental pollution, high maleic anhydride yield, low energy consumption, high steam output, and long operation cycle of the device.
After evaporation, butane is mixed with air and then enters the oxidation reactor. The oxidation reactor is a tubular fixed-bed reaction type, the catalyst is placed in the reaction tube, butane and air react with the catalyst to generate maleic anhydride, and at the same time release a large amount of reaction heat, which is removed by the molten salt on the shell side. After the heated molten salt is used to produce steam, it is returned to the reactor. In the oxidation reactor, the single-pass conversion rate of butane can reach 82-85%, and the weight yield of maleic anhydride is 97-103%.
The reacted gas enters the post-treatment system after two-stage cooling. The post-treatment system of Ruihua maleic anhydride technology adopts a solvent absorption process, and the solvent is dibutyl phthalate. After the reaction gas is absorbed, desorbed, and refined, the product maleic anhydride is obtained with a purity of 99.5%.
The purity of n-butane used to produce maleic anhydride should be >=99%, the total olefin content should be <=0.3%, and the sulfur and chlorine content should be <=10ppm.
N-butane can be separated from C4 materials containing n-butane such as mixed butane and ether carbon four, or it can be used after isobutane normalization process is used to make isobutane into n-butane.
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