On August 15th, the reporter learned from the Institute of Forest Products and Chemical Engineering of the Chinese Academy of Forestry that the key technology development project for environmentally-friendly plasticizer continuous production was approved by the Jiangsu Provincial Environmental Science Society. Ou Yangping The expert group composed of Academician Kay and Academician Chen Yong, Professor of Nanjing University of Technology, Professor Qiao Xu believes that the overall technical level of the project has reached international advanced level, and the continuous production technology of diisooctyl terephthalate (DOTP) has reached the international leading level. Using this technology, the energy consumption per unit of product can be reduced by more than 20%, and the production time can be shortened by more than 10%.
The appraisal opinion shows that the results are based on oils and fats, terephthalic acid, etc. The researchers have started from the existing process conditions, invented the new technology of slurry pretreatment and composite catalysis, and innovatively developed the reaction without plasticizer migration. Environmentally friendly products such as plasticizers, high flash point epoxy dimer fatty acid methyl ester plasticizer, etc., pioneered the new process of environmentally friendly plasticizer DOTP continuous production, which solved the high energy consumption and unstable quality of the batch process. And other issues. The economic and environmental benefits of the results are significant, and have a good demonstration and promotion of the development of environmental plasticizer industry.
According to reports, this new type of fluidized bed continuous synthesis DOTP process, the slurry is firstly reacted and then reacted, the reaction is sufficient, the time is short, the energy consumption is low, and continuous production can be realized. The device in the continuous preparation process includes The reaction kettle is composed of a slurry tank, a feed pump, a reaction kettle and the like in series. The reaction kettle and the circulation pump form a closed loop, and the reaction kettle, the oil water separator, the octanol tank, the reflux pump and the preheater form a closed loop. The material in the reactor is uniformly mixed by circulation instead of stirring, and the energy consumption is reduced. The holding pressure at the initial stage of the reaction is not higher than 0.3 MPa, which is beneficial to the reaction system entering the main reaction stage as soon as possible, quickly reaching the optimum reaction temperature, and improving the reaction. Rate; the negative pressure in the later stage of the reaction shifts the reaction in the positive direction, increasing the reflux rate of isooctanol and the rate of dehydration to increase the reaction rate.
It is understood that with the results of this technology, the project unit has built a continuous demonstration production line with an annual output of 10,000 tons of environmentally-friendly plasticizers, achieving continuous DOTP production, reducing energy consumption per unit of product by more than 20% and reducing production time by 10%. Above. The environmentally friendly plasticizer DOTP products have reached the industry standard and passed the SGS certification. After being applied by Jiangsu Shangshang Cable Group and Jiangsu Dongfeng Cable Co., Ltd., the results are excellent. In addition, the project also published academic papers. 53 articles, including 29 articles in SCI; 9 patents granted by the state, including 8 invention patents.
As the public pays more and more attention to health, more and more countries have issued bans on phthalate plasticizers. DOTP is a new type of environmentally friendly plasticizer with excellent performance, which can be widely used in various fields, especially temperature resistant cables. And the raw material terephthalic acid of DOTP can be extracted from waste polyester such as waste mineral water bottle, which can reduce production cost, reduce environmental pollution and realize waste recycling.