China's own diphenyl carbonate complete cleaning technology can provide complete software package for 10,000-ton industrial test equipment
At present, China's polycarbonate is almost entirely dependent on imports. Last year, the import volume reached 730,000 tons. In the next 5-10 years, its consumption will increase by 10%-15%. Many domestic companies are optimistic about this market and are planning to build a large-scale production plant for polycarbonate. It is expected that after 2010, the production capacity of polycarbonate in China will reach 300,000 tons, and the demand for supporting diphenyl carbonate at that time will be 26 Million - 30,000 tons.
The reporter learned that the production of diphenyl carbonate by transesterification can not only stimulate the market demand for products such as methanol and dimethyl carbonate, improve the industrial chain structure of coal and natural gas downstream in China, and increase the added value of products, but also can break foreign intellectual property barriers. , Providing reliable raw material protection for the clean production of polycarbonate in China.
Diphenyl carbonate is mainly used for the production of polycarbonate, and is widely used in solvents, plasticizers, medicines, pesticides and other fields. The production of diphenyl carbonate from virulent and highly corrosive phosgene is unfavorable for production safety and environmental protection. With the development of economy and technology, the use of non-toxic and non-polluting dimethyl carbonate to replace phosgene to synthesize carbonic acid Phenyl ester becomes a new choice. This technology belongs to the clean production process. It was first developed and industrialized by GE in the 1990s. The product, diphenyl carbonate, is mainly used to produce polycarbonate.
It is understood that researchers from Chengdu Organic Chemistry Co., Ltd. have designed and prepared new catalysts and high-efficiency reactors with excellent performance and reliability, optimized the reaction process conditions and methods for separating and purifying products, and mastered the core technology of the transesterification method. The process conditions were further optimized on the 1,000-ton pilot plant at Chaoyang Chemical Plant in Tangshan City, Hebei Province, and the engineering problems of key technologies such as catalyst life, reactive distillation, separation and purification were focused on, and the industrial test program was provided with reliability. The technical parameters. The operation of the pilot plant showed that the phenol conversion per pass was ≥46%, the diphenyl carbonate selectivity was ≥99%, the catalyst life was ≥1080 hours, and the product quality reached the polycarbon level requirement.