公开(公告)号：US4946940A

公开(公告)日：1990-08-07

申请号：US232713

申请日：1988-08-16

申请人： Terry L. Guckes ,  Mark A. McHugh ,  Charles Cozewith ,  Ronald L. Hazelton

发明人： Terry L. Guckes ,  Mark A. McHugh ,  Charles Cozewith ,  Ronald L. Hazelton

IPC分类号： C08F6/12

CPC分类号： C08F6/12 ,  Y02P20/544

摘要： A separation process has been found in which a polymer-solvent solution separates into phases of highly different composition which are in equilibrium over a broad temperature range. Upon addition of the phase separating agent, which is near or above its supercritical conditions, rapid disengagement into two phases occurs. The relative volume of solvent rich phase is substantially larger than the polymer rich phase. The process can be practiced at relatively low temperatures such as those employed in polymerization or post-polymerization processes. The separation is accomplished by adding or elevating the concentration of a phase separation agent to or above a minimum effective concentration, which causes the UCST and LCST lines to merge. Suitable phase separating agents are organic and inorganic compounds that are gases at 1 atm pressure and 25.degree. C. Due to the gaseous nature of the phase separating agent, it is easily removed from the solvent phase for reuse in the process.

摘要翻译： 已经发现一种分离方法，其中聚合物 - 溶剂溶液分离成在宽温度范围内处于平衡的高度不同组成的相。 当加入接近或超过其超临界条件的相分离剂时，发生快速分离成两相。 富溶相的相对体积基本上大于富聚合相。 该方法可以在相对较低的温度下进行，例如在聚合或后聚合过程中使用的那些。 通过将相分离剂的浓度添加或提高至或高于最小有效浓度来实现分离，这导致UCST和LCST系合并。 合适的相分离剂是在1atm压力和25℃下的气体的有机和无机化合物。由于相分离剂的气体性质，其易于从溶剂相中除去以便在该过程中重新使用。