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热词
    • 1. 发明授权
    • Process for separating low molecular weight compounds from an impure
thermoplastic polymer or mixture
    • 从不纯的热塑性聚合物或混合物中分离低分子量化合物的方法
    • US5459168A
    • 1995-10-17
    • US293151
    • 1994-08-19
    • Hedi B. NasrManfred GrabowKlaus Reimann
    • Hedi B. NasrManfred GrabowKlaus Reimann
    • B01D11/00B29B13/00B29C47/76B29C47/80B29K77/00C08F6/00C08G69/16C08J11/04
    • C08G69/16B29C47/76B29C47/0009B29C47/762B29K2077/00B29K2105/26
    • A process for treating an impure thermoplastic polymer, including raw and recycled polymers, during extrusion to separate low molecular weight compounds therefrom, including: introducing a separating agent into plasticized impure thermoplastic polymer passing through a first high pressure zone, the low molecular weight compounds of the plasticized polymer being at least partially soluble in the separating agent; extracting at least a part of the low molecular weight compounds from the plasticized polymer into the separation agent during passage of the plasticized polymer through an extraction zone; removing the separating agent charged with low molecular weight compounds from the extruder as the plasticized polymer passes through a low pressure zone having a residual pressure, P, which is lower the introductory pressure, P.sub.e, and for which 1 bar.gtoreq.P.gtoreq.P.sub.c ; collecting the charged separating agent as it is removed from the extruder; thermal vacuum treating the plasticized polymer as it passes through a last low pressure zone to vacuum degas the plasticized polymer at a pressure, P.sub.v, for which P.sub.v
    • 一种在挤出过程中处理不纯的热塑性聚合物,包括原料和再循环聚合物以分离其中的低分子量化合物的方法,包括:将分离剂引入通过第一高压区的塑化不纯的热塑性聚合物中,低分子量化合物 所述增塑聚合物至少部分地可溶于所述分离剂; 在塑化聚合物通过提取区期间,将至少一部分低分子量化合物从增塑聚合物中提取到分离剂中; 当塑化聚合物通过具有低导入压力Pe的低残留压力P的低压区域时,从挤出机中除去装有低分子化合物的分离剂,并且其中1巴/ = Pc; 收集从挤出机中取出的带电分离剂; 当塑化聚合物通过最后一个低压区域时,对真空脱泡增塑聚合物以Pv <0.5巴的压力Pv进行热真空处理,从而进一步从增塑聚合物中除去分离剂和低分子量化合物; 并将塑化的聚合物通过最后一个高压区到挤出机头。 挤出机中的溶剂萃取与随后的真空脱气的组合导致大量的具有相对较少能量消耗的低分子量化合物的去除,因为仅需要去除残余物才需要进行能量密集的真空脱气。