Process for the removal of alkali from condensation resins
    3.
    发明授权
    Process for the removal of alkali from condensation resins 失效
    从缩合树脂中除去碱的方法

    公开(公告)号:US5770677A

    公开(公告)日:1998-06-23

    申请号:US797124

    申请日:1997-02-10

    摘要: A process for the preparation of a condensation resin of low catalyst content from a ketone and an aldehyde comprising reacting the ketone and aldehyde in a polycondensation reaction in an aqueous medium in the presence of a basic catalyst to form the resin, which is contaminated with alkali ions from the basic catalyst, and then exposing the resin to an electrical field in a cell demarcated by ion-selective membranes permeable to the alkali ions whereby alkali ions are caused to migrate out of the resin through the membranes. Also, a process for the removal of alkali from condensation resins as described above.

    摘要翻译: 一种从酮和醛制备低催化剂含量的缩合树脂的方法,包括在碱性催化剂存在下,在含水介质中的缩聚反应中使酮和醛反应,从而形成被碱污染的树脂 离子,然后将树脂暴露于由可渗透碱离子的离子选择膜划分的细胞中的电场,由此使碱离子从树脂中迁移通过膜。 另外,从如上所述的缩合树脂中除去碱的方法。