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Method of Producing Phthalic Anhydride and Its Recovery Process


1. Method of producing phthalic anhydride


Phthalic anhydride is an important chemical raw material. The current methods for producing phthalic anhydride mainly include naphthalene oxidation and o-xylene oxidation. Both methods have dark brown distillation in the purification process of phthalic anhydride. The residue is produced. The waste material contains a large amount of phthalic anhydride, and also contains part of black tar and high polymer, which cannot be directly produced and utilized.


2. The recovery process of phthalic anhydride


At present, there are various recovery methods, among which the solvent extraction method, sublimation method and reaction deep processing method are more frequently used. According to the requirements of the proposed product that the product does not contain tar, the yield is high, and the cost is low, using a simple and reasonable recycling process, almost all the phthalic anhydride in the waste can be recovered, and the product quality is good.


One should use a reasonable recycling process to process and recycle waste materials, and combine the needs of the factory to return phthalic anhydride to the phthalic anhydride production unit to produce high-quality industrial products without affecting the normal production of the phthalic anhydride unit. It can reduce the production cost of phthalic anhydride and bring certain economic benefits to the factory.


Shanghai Douwin Chemical Co.,Ltd. (Suzhou Dexi) will continue to innovate marketing strategies, optimize internal management systems, provide better services to our customers, and achieve mutual benefit and win-win results.


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