A research group led by Prof. GAO Jin and Prof. XU Jie from the Dalian Institute of Chemical Physics (DICP) of the Chinse Academy of Sciences (CAS) developed a new technology for liquid phase oxidation and then esterification of o-xylene to produce dimethyl phthalate. In cooperation with Shaanxi Yanchang Petroleum (Group) Co., Ltd., they built the first 2000 t/a industrial test equipment.
The industrial test was completed in July 2019. And recently, it passed the on-site assessment by experts organized by China Petroleum and Chemical Industry Federation.
The First 2000 t/a Industrial Test Equipment for Liquid Phase Oxidation of o-Xylene (Image by HUANG Yizheng)
Compared with the traditional gas phase oxidation process, the oxidation reaction temperature in the new technology was reduced by 160-180°C, and the yield of dimethyl phthalate was increased by 12-17 percentage. It could greatly reduce the consumption of o-xylene and the emission of CO2.
This work was supported by Major Project of National Natural Science Foundation of China and the Strategic Priority Research Program of the Chinese Academy of Sciences, etc.
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