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    • 36. 发明授权
    • Process for the production of polycarbonate
    • 聚碳酸酯生产工艺
    • US5258484A
    • 1993-11-02
    • US902356
    • 1992-06-19
    • Reinhard SchomackerUwe HucksGunther WeymansWolfgang HerrigJurgen Kirsch
    • Reinhard SchomackerUwe HucksGunther WeymansWolfgang HerrigJurgen Kirsch
    • C08G64/22C08G64/24
    • C08G64/24
    • A process for the continuous production of a thermoplastic aromatic polycarbonate is disclosed. Accordingly, in a reactor system which includes a tube reactor and a tank equipped with a stirrer, there are reacted a preheated dialkali diphenolate aqueous solution with gaseous phosgene in CH.sub.2 Cl.sub.2 and/or in chlorobenzene solution containing excess phosgene, in a mixer to form a mixed emulsion. The emulsion is then transported at least partly against the force of gravity into the tube reactor to facilitate a polycondensation reaction and in which after a residence time of at least 10 seconds and without dissipation of the heat of reaction there is added a chain terminator. The heat of reaction is dissipated in said tank and aqueous sodium hydroxide and catalyst are added to complete the reaction. The process according to the invention leads to high yields of phosgene.
    • 公开了连续生产热塑性芳族聚碳酸酯的方法。 因此,在包括管式反应器和装有搅拌器的罐的反应器系统中,在混合器中使预热的二元醇二酚盐水溶液与气态光气在CH 2 Cl 2中和/或含有过量光气的氯苯溶液中反应,形成混合 乳液。 然后将乳液至少部分地抵抗重力输送到管式反应器中以促进缩聚反应,并且其中在至少10秒的停留时间之后并且不消耗反应热量时,添加了链终止剂。 在所述槽中消散反应热,加入氢氧化钠水溶液和催化剂以完成反应。 根据本发明的方法导致高产率的光气。