Process of recovering polymeric beads from an aqueous slurry thereof, containing a poly(vinyl alcohol) dispersion stabiliser, by a physical separation such as filtration; the process can be seriously impeded by blinding of the filter bed, reducing throughput rates to an intolerably low level.
In order to achieve an efficient dewatering, an insoluble organic destabiliser is formed "in situ" in the slurry from a soluble parent compound comprising solubilising ionisable groups. The slurry may then be filtered at a temperature not lower than 50°C to yield a soft cake of polymer beads, essentially free of poly(vinyl alcohol) dispersion stabiliser.
从含有聚(
乙烯醇)分散稳定剂的
水性浆料中回收聚合微珠的工艺,采用过滤等物理分离方法;该工艺可能会因滤床堵塞而严重受阻,使处理率降低到难以容忍的低
水平。
为了实现高效脱
水,一种不溶性的有机去稳定剂在浆料中 "原位 "形成,它是由一种包含可溶解离子基团的可溶性母体化合物形成的。然后,可在不低于 50°C 的温度下对浆料进行过滤,以获得基本上不含聚
乙烯醇分散稳定剂的聚合物珠软饼。