Abstract:

Purification of polyether polyols，ZSN-330，with low unsaturated degree was studied by using ultrafiltration membrane prepared from polyethersulphone（PES）. Crude polyether polyols were used as polyols/hexane miscella in a 1∶1 proportion. The intercepting rate of zinc and cobalt ions were more than 90% and the content of zinc and cobalt ions were less than 1 mg/g among most tests. The double metal cyanide catalysts（DMC）was found in the residue by IR test. The effects of molecular weight cut-off，feed liquid viscosity，operating pressure，flow speed on permeate flux were investigated. The optimal operating condition of ultrafiltration were determined as molecular weight cut-off 150 kDa，diluting by hexane in a 1∶1 proportion，operating pressure 0.5 MPa，flow speed 40 L/h. The contaminated membrane was ultrasonic cleaned by deionized water，2‰ sodium hydroxide solution，hexane，respectively. The one cleaned by 2‰ sodium hydroxide solution，can recover up to 66.4% permeate flux，better than other two solutions.

摘要：

采用聚醚砜超滤膜对ZSN-330低不饱和度聚醚多元醇进行精制，粗聚醚多元醇由正己烷1∶1体积比稀释，精制效果很好，大部分检测时间下锌、钴离子截留率高达90%以上，含量低于1 mg/g。采用红外分析并验证了截留物中含有双金属氰化络合物催化剂（DMC）成分。考察了膜截留分子量、料液黏度、操作压力、料液流速等对膜通量的影响，确定了较佳的超滤条件为膜截留分子量为150 kDa、由正己烷1∶1稀释、操作压力0.5 MPa、料液流速40 L/h。分别采用去离子水、2‰氢氧化钠溶液、正己烷溶剂超声清洗污染的膜，2‰氢氧化钠溶液的清洗效果较好，膜通量恢复率达66.4%。