CO2 green use of industrial park will be born

The world's first green carbon dioxide (CO2) use of low-carbon eco-industrial park is planned to be built in the Changshu New Material Zone in Jiangsu Province. On the eve of the 60th anniversary of the establishment of East China University of Science and Technology, Professor Tian Hengshui of the School of Chemical Engineering of the University said in an interview: “The Park will create an industrial chain with carbon dioxide as its source, with a total investment of approximately 35 billion yuan, an output value of 89 billion yuan, and profits and taxes. RMB 27 billion will be completed by 2020. The first phase of the project includes dimethyl carbonate, pesticides, pharmaceuticals and fine chemical intermediates, and oil additives. It is expected to start production in the first half of 2014.” The reporter also learned that To promote the industrialization of scientific research achievements, East China University of Science and Technology recently established a multi-investment of Shanghai Henghe Environmental Protection New Material Technology Co., Ltd. to carry out environmental assessment and design, and organize investment promotion.

In the early 1990s, Professor Tian Hengshui of East China University of Science and Technology began to study the use of carbon dioxide as a useful chemical raw material to develop a green fine chemical industrial chain with carbon dioxide as its source. The Tian Hengshui team discovered a phenomenon during research: During the production of glycols from epoxy compounds, a lot of activity and energy are wasted, and these activities and energies can just be used to activate carbon dioxide. Through a large number of tests, the technical problem of carbon dioxide activity has finally been solved. Since then, they have adopted the international advanced near-critical catalytic reaction and thermal cycle energy-saving technology, through the propylene carbonate (ethylene) ester process, and then synthesized chemical raw materials of dimethyl carbonate, and co-production of glycol.

The production of dimethyl carbonate from carbon dioxide waste gas is a major breakthrough in the global traditional process. Dimethyl carbonate is a non-toxic, environmentally friendly, widely used chemical raw material. It was classified as a non-toxic product by Europe in 1992 and is an environmentally friendly chemical raw material. It is praised as a new cornerstone of organic synthesis in the 21st century. . Most of the world adopts the traditional phosgene production route. Due to the high toxicity and corrosiveness of the raw material phosgene, as well as the emission of biological hydrogen chloride and sodium chloride, the environmental protection and safety pressures of enterprises are relatively large, and usually only phosgene is produced. The company produces dimethyl carbonate nearby. The Tian Hengshui team indirectly realized the production of dimethyl carbonate by replacing carbon dioxide with phosgene, and the series of green products such as methyl ethyl carbonate and diethyl ester, which have significant environmental and economic benefits.

At present, the production of dimethyl carbonate with carbon dioxide off-gas has already produced fruit in China. Twelve companies such as Tongling Jintai Chemical Industry Co., Ltd. have successfully achieved industrial application, with a total annual production of 300,000 tons of dimethyl carbonate. These enterprises use about 280,000 tons of carbon dioxide each year. Instead of phosgene, they can save 884,000 tons of standard coal, equivalent to 2.2 million tons of carbon dioxide emissions, reduce more than 10 million tons of wastewater, and increase profits and taxes by 1.5 billion yuan.

The test results of Tongling Jintai Company show that compared with the traditional process, the clean production of propylene carbonate can save 45% of steam, 70% of electricity, 3% to 5% of raw material propylene oxide, and 60% of water. At the same time, the investment in dimethyl carbonate green production technology has been reduced by 75%, energy consumption has been reduced by 90%, production cost has been reduced by 50%, and the green production of methyl ethyl carbonate and diethyl ester has been reduced by 50%, saving 50% of cooling water. The effectiveness of energy saving and emission reduction is very obvious.

"The successful development of this technology has provided a new approach for the green use of carbon dioxide emission reduction and resource utilization. The overall technology has reached the international advanced level. Among them, the process of using carbon dioxide as raw material to apply multiple coupling process enhancement technologies to produce carbonate series products has reached Leading international standards.” In October 2010, six academicians such as Wu Weizu and Sun Baoguo from the Chinese Academy of Engineering had highly praised this technology at the appraisal meeting on key technologies for the green utilization of carbon dioxide resources organized by the China Petrochemical Federation. The project has won the first prize for technological innovation from the China Petrochemical Federation and the first prize for Shanghai's technological invention.

During the "Twelfth Five-Year Plan" period, the green carbon dioxide utilization of low-carbon eco-industrial chain project was listed as the top priority for the long-term development of the Fine Chemicals Committee of the Chinese Chemical Society. Professor Tian Hengshui introduced: “According to the plan, Changshu’s carbon dioxide green high-tech fine chemical industry chain will gather 12 categories and more than 30 products into a single park, using coal and biomass to make methanol, synthesize olefins, and then use carbon dioxide as raw material. Produce dimethyl carbonate and B (propyl) alcohol; use carbon dioxide instead of phosgene to make various types of pesticides, pharmaceutical intermediates, produce clean fuels such as methanol gasoline and methanol-diesel; use carbonic acid to synthesize acrylates and polyurethanes with high market demand And new materials such as polycarbonate, as well as other fine chemicals."

He explained: “Every link in the whole industry chain can be seen as carbon dioxide. Products in each link can be sold separately as finished products, and can also be used as raw materials to participate in the production of downstream products, and the by-products and associated products produced in production nodes. The products can be used as raw materials for the next production, additives, or raw materials for recycling. Seamless connection between production companies, significant savings in business costs, and improved utilization of raw materials and energy."

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