公开(公告)号：AT452123T

公开(公告)日：2010-01-15

申请号：AT01960244

申请日：2001-05-25

Applicant: BASF SE

Inventor： ECK BERND ,  HEILEK JOERG ,  SCHMIDT-RADDE MARTIN ,  HELFERT HERBERT

IPC: C07D207/267 ,  C07D201/16 ,  C07D207/26

Abstract: The invention describes a process for the isolation of pure N-vinylpyrrolidone from N-vinylpyrrolidone-containing crude products, comprising a single-stage or multistage crystallization process, which comprises passing the mother liquor from the first crystallization stage either to a distillative and/or extractive purification, or returning it to an N-vinylpyrrolidone-containing product stream of the preparation process.

公开(公告)号：ES2336890T3

公开(公告)日：2010-04-19

申请号：ES01960244

申请日：2001-05-25

Applicant: BASF SE

Inventor： ECK BERND ,  HEILEK JORG ,  SCHMIDT-RADDE MARTIN ,  HELFERT HERBERT

IPC: C07D207/267 ,  C07D201/16 ,  C07D207/26

Abstract: Procedimiento para la obtención de N-vinilpirrolidona pura a partir de productos en bruto que contienen N-vinilpirrolidona, que comprende un procedimiento de cristalización con una o con varias etapas, caracterizado porque la lejía madre de la primera etapa de cristalización se alimenta a una purificación por destilación.

公开(公告)号：DE50115263D1

公开(公告)日：2010-01-28

申请号：DE50115263

申请日：2001-05-25

Applicant: BASF SE

Inventor： ECK BERND ,  HEILEK JOERG ,  SCHMIDT-RADDE MARTIN ,  HELFERT HERBERT

IPC: C07D207/267 ,  C07D201/16 ,  C07D207/26

Abstract: The invention describes a process for the isolation of pure N-vinylpyrrolidone from N-vinylpyrrolidone-containing crude products, comprising a single-stage or multistage crystallization process, which comprises passing the mother liquor from the first crystallization stage either to a distillative and/or extractive purification, or returning it to an N-vinylpyrrolidone-containing product stream of the preparation process.