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公开(公告)号：CZ290277B6
公开(公告)日：2002-06-12
申请号：CZ20001930
申请日：1998-11-24
Applicant: BASF AG
Inventor： HILDEBRAND PETER , LANG REINHARD , LUDWIG ALFONS , PIPPER GUNTER
Abstract: Disclosed is a continuous extraction process of polyamide particles by means of a circulating aqueous extraction solution within a closed circuit and in substantially stand-up extraction column divided in two zones, wherein in the first zone polyamide is treated with aqueous solution of {epsilon}-caprolactam with concentration ranging within 15 to 40 percent by weight as an extraction agent at a temperature ranging from 100 to 140 degC and subsequently in the second zone it is additionally extracted with water with temperature being by 5 to 40 degC lower. The invented process enables economical manufacture of polyamide with low content of monomer and oligomers.
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公开(公告)号：AU1963899A
公开(公告)日：1999-06-15
申请号：AU1963899
申请日：1998-11-24
Applicant: BASF AG
Inventor： HILDENBRAND PETER , LANG REINHARD , LUDWIG ALFONS , PIPPER GUNTER
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.
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公开(公告)号：BR9815006A
公开(公告)日：2002-09-24
申请号：BR9815006
申请日：1998-11-24
Applicant: BASF AG
Inventor： HILDENBRAND PETER , LANG REINHARD , LUDWIG ALFONS , PIPPER GUNTER
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.
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公开(公告)号：HU0100191A2
公开(公告)日：2001-05-28
申请号：HU0100191
申请日：1998-11-24
Applicant: BASF AG
Inventor： HILDENBRAND PETER , LANG REINHARD , LUDWIG ALFONS , PIPPER GUNTER
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.
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公开(公告)号：ID24217A
公开(公告)日：2000-07-13
申请号：ID20000978
申请日：1998-11-24
Applicant: BASF AG
Inventor： HILDENBRAND PETER , LANG REINHARD , LUDWIG ALFONS , PIPPER GUNTER
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.
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Patent Agency Ranking
公开(公告)号：PL192671B1
公开(公告)日：2006-11-30
申请号：PL34157298
申请日：1998-11-24
Applicant: BASF AG
Inventor： HILDENBRAND PETER , LANG REINHARD , LUDWIG ALFONS , PIPPER GUNTER
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公开(公告)号：TR200001511T2
公开(公告)日：2002-07-22
申请号：TR200001511
申请日：1998-11-24
Applicant: BASF AG
Inventor： HILDENBRAND PETER , LANG REINHARD , LUDWIG ALFONS , PIPPER GUNTER
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.
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公开(公告)号：CZ20001930A3
公开(公告)日：2000-11-15
申请号：CZ20001930
申请日：1998-11-24
Applicant: BASF AG
Inventor： HILDEBRAND PETER , LANG REINHARD , LUDWIG ALFONS , PIPPER GUNTER
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.
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公开(公告)号：SK6972000A3
公开(公告)日：2000-11-07
申请号：SK6972000
申请日：1998-11-24
Applicant: BASF AG
Inventor： HILDENBRAND PETER , LANG REINHARD , LUDWIG ALFONS , PIPPER GUNTER
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.
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公开(公告)号：MY129533A
公开(公告)日：2007-04-30
申请号：MYPI9805229
申请日：1998-11-18
Applicant: BASF AG
Inventor： LUDWIG ALFONS , PIPPER GUNTER , HILDENBRAND PETER , LANG REINHARD
Abstract: A PROCESS FOR CONTINUOUS EXTRACTION OF POLYAMIDE PARTICLES IN AN ESSENTIALLY VERTICAL EXTRACTION COLUMN (1) USING AN AQUEOUS EXTRACTANT COMPRISES USING AN EXTRACTION COLUMN (1) THAT IS DIVIDED INTO TWO ZONES (2,3) AND PERFORMING AN EXTRACTION WITH A RECIRCULATING 15-40% STRENGTH BY WEIGHT AQUEOUS &egr;-CAPROLACTAM SOLUTION IN THE FIRST ZONE (2) AND THEN WITH COUNTERCURRENT WATER AT A FROM 5 TO 40°C. LOWER TEMPERATURE IN THE SECOND ZONE (3). THE PROCESS PROVIDES FOR ECONOMICAL EXTRACTION OF POLYAMID S WITH A LOW LEVEL OF MONOMERS AND OLIGOMERS. (SOLE
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