公开(公告)号：BG64318B1

公开(公告)日：2004-09-30

申请号：BG10445900

申请日：2000-05-18

Applicant: BASF AG

Inventor： HILDENBRAND PETER ,  LANG REINHARD ,  LUDWIG ALFONS ,  PIPPER GUNTER

IPC: C08J3/12 ,  B29B9/16 ,  C08G69/16 ,  C08G69/46

Abstract: A process is disclosed for continuously extracting polyamide articles from a circulating extraction solution in a vertical reaction column subdivided into two zones. In the first zone the polyamide is treated with an aqueous epsilon-caprolactam solution with 15 to 40 wt. % epsilon-caprolactam as extraction agent at 100 to 140 degrees C and water is then used in the second zone as extraction agent at a temperature 5 to 40 degrees C lower. The process allows polyamides with a low monomer and oligomer content to be economically extracted. 10 claims, 1 figure

公开(公告)号：ES2172958T3

公开(公告)日：2002-10-01

申请号：ES98967143

申请日：1998-11-24

Applicant: BASF AG

Inventor： HILDENBRAND PETER ,  LANG REINHARD ,  LUDWIG ALFONS ,  PIPPER GUNTER

IPC: B29B9/16 ,  C08G69/16 ,  C08J3/12 ,  C08G69/46

Abstract: A process for continuous extraction of polyamide particles in an essentially vertical extraction column using an aqueous extractant comprises using an extraction column that is divided into two zones and performing an extraction with a recirculating 15-40% strength by weight aqueous epsi-caprolactam solution in the first zone and then with countercurrent water at a from 5 to 40° C. lower temperature in the second zone. The process provides for economical extraction of polyamides with a low level of monomers and oligomers.

公开(公告)号：SI1030872T1

公开(公告)日：2002-04-30

申请号：SI9830115

申请日：1998-11-24

Applicant: BASF AG

Inventor： HILDENBRAND PETER ,  LANG REINHARD ,  LUDWIG ALFONS ,  PIPPER GUNTER

IPC: C08G69/16 ,  C08G69/46

公开(公告)号：DE59803036D1

公开(公告)日：2002-03-21

申请号：DE59803036

申请日：1998-11-24

Applicant: BASF AG

Inventor： HILDENBRAND PETER ,  LANG REINHARD ,  LUDWIG ALFONS ,  PIPPER GUNTER

IPC: C08J3/12 ,  B29B9/16 ,  C08G69/16 ,  C08G69/46

Abstract: A process for continuous extraction of polyamide particles in an essentially vertical extraction column using an aqueous extractant comprises using an extraction column that is divided into two zones and performing an extraction with a recirculating 15-40% strength by weight aqueous epsi-caprolactam solution in the first zone and then with countercurrent water at a from 5 to 40° C. lower temperature in the second zone. The process provides for economical extraction of polyamides with a low level of monomers and oligomers.

公开(公告)号：CO5040145A1

公开(公告)日：2001-05-29

申请号：CO98069226

申请日：1998-11-24

Applicant: BASF AG

Inventor： HILDENBRAND PETER ,  LANG REINHARD ,  LUDWIG ALFONS ,  GUNTER PIPPER

IPC: C08J3/12 ,  B29B9/16 ,  C08G69/02 ,  C08G69/16 ,  C08G69/46

Abstract: Un proceso para la extracción continua de partículas de poliamidaen una columna de extracción esencialmente vertical usando un extractante acuoso, que comprende usar una columna de extracción que está dividida en dos zonas y llevar a cabo una extracción con una solución de e-caprolactama acuosa con 15 a 40% de concentración en peso recirculante en la primer zona y luego con agua en contracorriente en la segunda zona.

公开(公告)号：BG104459A

公开(公告)日：2001-01-31

申请号：BG10445900

申请日：2000-05-18

Applicant: BASF AG

Inventor： HILDENBRAND PETER ,  LANG REINHARD ,  LUDWIG ALFONS ,  PIPPER GUNTER

IPC: C08J3/12 ,  B29B9/16 ,  C08G69/16 ,  C08G69/46

Abstract: A process is disclosed for continuously extracting polyamide articles from a circulating extraction solution in a vertical reaction column subdivided into two zones. In the first zone the polyamide is treated with an aqueous epsilon-caprolactam solution with 15 to 40 wt. % epsilon-caprolactam as extraction agent at 100 to 140 degrees C and water is then used in the second zone as extraction agent at a temperature 5 to 40 degrees C lower. The process allows polyamides with a low monomer and oligomer content to be economically extracted. 10 claims, 1 figure

公开(公告)号：CA2310848A1

公开(公告)日：1999-06-03

申请号：CA2310848

申请日：1998-11-24

Applicant: BASF AG

Inventor： HILDENBRAND PETER ,  PIPPER GUNTER ,  LUDWIG ALFONS ,  LANG REINHARD

IPC: C08J3/12 ,  B29B9/16 ,  C08G69/16 ,  C08G69/46

Abstract: A process is disclosed for continuously extracting polyamide particles from a circulating extraction solution in a vertical extraction column subdivided into two zones. The polyamide is treated in the first zone with an aqueous .epsilon.-caprolactam solution with 15-40 wt. % .epsilon.-caprolactam as extraction agent at 100 to 140 ~C, and water is then used in the second zone as extraction agent at a temperature 5-40 ~C lower. The process allows polyamides with a low monomer and oligomer content to be economically extracted.

公开(公告)号：PL341572A1

公开(公告)日：2001-04-23

申请号：PL34157298

申请日：1998-11-24

Applicant: BASF AG

Inventor： HILDENBRAND PETER ,  LANG REINHARD ,  LUDWIG ALFONS ,  PIPPER GUNTER

IPC: B29B9/16 ,  C08G69/16 ,  C08J3/12 ,  C08G69/46

Abstract: A process for continuous extraction of polyamide particles in an essentially vertical extraction column using an aqueous extractant comprises using an extraction column that is divided into two zones and performing an extraction with a recirculating 15-40% strength by weight aqueous epsi-caprolactam solution in the first zone and then with countercurrent water at a from 5 to 40° C. lower temperature in the second zone. The process provides for economical extraction of polyamides with a low level of monomers and oligomers.