公开(公告)号：US20230159356A1

公开(公告)日：2023-05-25

申请号：US17920254

申请日：2021-04-20

Applicant: NIPRO CORPORATION

Inventor： Michihito HIWATARI ,  Eiji SATOH

IPC: C02F1/44

CPC classification number: C02F1/444 ,  C02F1/441 ,  C02F2103/34

Abstract: A pretreatment method is provided for efficiently recovering a solvent from a raw material mixture comprising water, the solvent and a polymer dissolved and/or dispersed therein.
The pretreatment method includes a step of subjecting the raw material mixture 12 to an ultrafiltration treatment 16, 18 to filter out the polymer so as to obtain a filtrate 36 of which polymer content is reduced.