公开(公告)号：US20240207818A1

公开(公告)日：2024-06-27

申请号：US18288047

申请日：2022-04-22

Applicant: BASF SE

Inventor： Joerg KRESS ,  Beatus Daniel SCHEHL

IPC: B01J20/34 ,  C08F226/10

CPC classification number: B01J20/3425 ,  B01J20/3475 ,  C08F226/10 ,  B01J2220/4812

Abstract: The present invention relates to a method for the regeneration of special filter aids, namely, to crosslinked copolymers comprising N-vinylimidazole and N-vinylpyrrolidone as monomeric units, wherein an according copolymer is subsequently i) rinsed with water, ii) brought into contact with an aqueous solution of at least one acid, iii) rinsed with water to neutralize the copolymer, iv) brought into contact with an aqueous solution of at least one base, and v) rinsed with water or an aqueous solution of at least one acid to neutralize the copolymer. The invention also relates to a regenerated copolymer producible by said method and its use as a filter aid for the stabilization of beverages.