改良Hofmann法制备聚乙烯胺

采用Hofmann法制备聚乙烯胺(PVAm),考察了物料比、反应温度和加料方式等条件对聚乙烯胺收率和胺化度的影响,研究碱性反应母液的回收循环利用。结果表明,使用商品化非离子型聚丙烯酰胺(PAM)作为原料,可得到胺化度达84.54%的聚乙烯胺产品,回收的碱液可循环使用3次。反应采取将聚丙烯酰胺直接加入NaClO和NaOH溶液中制备聚丙烯酰胺氯胺化产物的加料操作方式,再加入碱溶液中进行重排反应,单位体积反应液中产品生产量可提高4倍。

Preparation of Polyvinylamine (PVAm) by Modified Hofmann Degradation

This paper carries out a study on the preparation of polyvinylamine(PVAm) by method of Hofmann degradation.The material ratio,reaction temperature,addition mode and other reaction conditions which affect amination degree were discussed,and the recycle of the mixed solution containing alcohol and base was studied.The results show that,when commercial nonionic polyacrylamide(PAM) was used as the raw material,the amination degree of the product could reach 84.54%,and the base solution recycled from the mixture could be reused for 3 times.In this modified Hofmann degradation,polyacrylamide was directly added into NaClO and NaOH solution to prepare chloro-polyacrylamide,which was subsequently put into base solution.This improved method could increase the yield per volume solution by 4 times.