SEMI-BATCH PROCESS FOR MAKING POLYCARBONATE POLYOLS VIA COPOLYMERIZATION OF CARBON DIOXIDE AND AN OXIRANE

• Main Authors: NIKBIN NIMA, BABB DAVID
• Format: Patent
• Language: Chinese; English
• Published: 13.09.2019
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

Polycarbonate polyols are made by copolymerizing carbon dioxide and an alkylene oxide in the presence of a starter compound and a carbonate catalyst. The process is operated in semi-batch mode by combining starter, catalyst and a small amount of alkylene oxide in a reaction vessel, pressurizing the vessel with carbon dioxide, initiating polymerization, and then feeding both carbon dioxide and alkylene oxide to the vessel under polymerization conditions without removal of product until the feeds are completed. 通过在起始剂化合物和碳酸酯催化剂的存在下使二氧化碳和环氧烷共聚制备聚碳酸酯多元醇。该工艺以半分批模式通过在反应容器中合并起始剂、催化剂和少量环氧烷，用二氧化碳对容器加压，引发聚合，然后在聚合条件下将二氧化碳和环氧烷进料到容器中而不除去产物直到完成进料来操作。