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    Isolation of polycarbonate with carbon dioxide
    2.
    发明授权
    Isolation of polycarbonate with carbon dioxide 失效
    用二氧化碳分离聚碳酸酯

    公开(公告)号：US5250658A

    公开(公告)日：1993-10-05

    申请号：US940566

    申请日：1992-09-04

    申请人： Hanns-Ingolf Paul ,  Rolf Treckmann ,  Gunther Weymans ,  Jurgen Kirsch ,  Wolfgang Herrig

    发明人： Hanns-Ingolf Paul ,  Rolf Treckmann ,  Gunther Weymans ,  Jurgen Kirsch ,  Wolfgang Herrig

    IPC分类号： C08G64/40 ,  C08J3/14

    CPC分类号： C08J3/14 ,  C08G64/403 ,  C08J2369/00

    摘要： According to the invention, a special process for isolating polycarbonate from methylene chloride at temperatures of 30.degree. to 80.degree. C. in the form of a powder with residual solvent contents below 5% by weight is started up as a continuous process by starting up in a two-component nozzle, in which CO.sub.2 -containing fluid and the polymer solution are continuously combined, with a large excess of CO.sub.2 and then allowing the polycarbonate/methylene chloride/CO.sub.2 fluid system to pass through the gel-forming range of the polycarbonate/methylene chloride/CO.sub.2 phase diagram with continuous reduction of the CO.sub.2 throughput to a ratio of CO.sub.2 to organic solution of 4:1 to 2:1. The process started up in this way has a particularly long useful life.

    摘要翻译： 根据本发明，通过以30重量％〜80℃的温度从二氯甲烷中分离残留溶剂含量低于5重量％的粉末形式的特殊方法作为连续方法开始，通过在 将含有CO 2的流体和聚合物溶液连续组合的双组分喷嘴与大量过量的CO 2混合，然后使聚碳酸酯/二氯甲烷/ CO 2流体系统通过聚碳酸酯/ 二氧化氯/ CO2相图，将CO 2通量的持续降低至4：1至2：1的CO 2与有机溶液的比例。 以这种方式启动的过程具有特别长的使用寿命。

    Process for isolating polycarbonates with CO.sub.2 under pressure
    3.
    发明授权
    Process for isolating polycarbonates with CO.sub.2 under pressure 失效
    在压力下用二氧化碳分离聚碳酸酯的方法

    公开(公告)号：US5221731A

    公开(公告)日：1993-06-22

    申请号：US888942

    申请日：1992-05-26

    申请人： Gunther Weymans ,  Jurgen Kirsch ,  Wolfgang Herrig ,  Hanns-Ingolf Paul ,  Rolf Treckmann

    发明人： Gunther Weymans ,  Jurgen Kirsch ,  Wolfgang Herrig ,  Hanns-Ingolf Paul ,  Rolf Treckmann

    IPC分类号： C08G64/40 ,  C08J3/14

    CPC分类号： C08G64/403

    摘要： A continuous process for the isolation of polycarbonates from a solution of polycarbonate in methylene chloride at temperatures of 30.degree. to 80.degree. C. is disclosed. The process which yields polycarbonate in powder form having residual solvent content of less than 5% by weight, is characterized in that it entails the following steps:a) obtaining a solution of polycarbonate in methylene chloride containing 10 to 40 percent polycarbonate, said percent being relative to the total weight of the polycarbonate solution,b) mixing into said solution under pressures of 10 to 50 bar and at temperatures of 30.degree. to 50.degree. C. a fluid containing carbon dioxide resulting in a non-gelling polycarbonate/methylene/chloride/dioxide pressurized system, in which between 10 and 12% CO.sub.2 are dissolved,c) mixing said pressurized system in a two-component nozzle with additional fluid containing carbon dioxide under a pressure of 50 to 300 bar and at temperatures of 40.degree. to 150.degree. C., to cause rapid precipitation of polycarbonate in the form of solid particles, the quantitative ratio of CO.sub.2 to solution being between 1.0 and 15, preferably between 2.5 and 8.0,f) separating methylene chloride and carbon dioxide gases in a compressor/condenser system.The process is further characterized in that a time interval of at least 0.1 second separates step b) and step c), and in that the input of the fluid containing carbon dioxide is controlled to prevent gelatin in step b) and in that the pressurized system is above the gelation range in step c).

    摘要翻译： 公开了一种在聚碳酸酯从二氯甲烷溶液中分离聚碳酸酯的连续方法，其温度为30℃至80℃。 产生具有小于5重量％的残留溶剂含量的粉末形式的聚碳酸酯的方法的特征在于其需要以下步骤：a）获得聚碳酸酯在含有10-40％聚碳酸酯的二氯甲烷中的溶液，所述百分比为 相对于聚碳酸酯溶液的总重量，b）在10至50巴的压力和30至50℃的温度下将所述溶液混合到含有二氧化碳的流体中，得到非胶凝聚碳酸酯/亚甲基/氯化物 二氧化碳加压系统，其中溶解有10至12％的二氧化碳，c）将所述加压系统混合在双组分喷嘴中，在50至300巴的压力和40至150℃的温度下将含有二氧化碳的另外的流体混合 为了引起固体颗粒形式的聚碳酸酯的快速沉淀，CO 2与溶液的定量比在1.0和15之间，优选在2.5和8.0之间，f）sepa 在压缩机/冷凝器系统中评估二氯甲烷和二氧化碳气体。 该方法的特征还在于，至少0.1秒的时间间隔分离步骤b）和步骤c），并且控制含二氧化碳的流体的输入以防止步骤b）中的明胶，并且加压系统 在步骤c）中的凝胶化范围之上。