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公开(公告)号：HU0204032A2
公开(公告)日：2003-03-28
申请号：HU0204032
申请日：2000-11-29
Applicant: BASF AG
Inventor： LUDWIG ALFONS , PILLE RAGNHILD , PIPPER GUNTER
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公开(公告)号：ES2177117T3
公开(公告)日：2002-12-01
申请号：ES98962392
申请日：1998-11-24
Applicant: BASF AG
Inventor： HUNGER HANS-HARALD , LUDWIG ALFONS , NEUBERG RAINER , PIPPER GUNTER , SAUER THOMAS , WILMS AXEL
Abstract: The disclosure is a process for preparing polyamides by concentrating the wash water extract from the extraction of polyamide to an extractables content of not more than 85% by weight, adding fresh lactam down to a water content of from 0.5 to 13% by weight, and effecting at least one adiabatic expansion during the polymerization.
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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
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：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
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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
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：BR0011402A
公开(公告)日：2002-03-05
申请号：BR0011402
申请日：2000-06-05
Applicant: BASF AG
Inventor： MOHRSCHLADT RALF , HILDEBRANDT VOLKER , LUDWIG ALFONS
Abstract: A process for producing polyamides by reacting at least one lactam and optionally further polyamide-forming monomers with aqueous monomer and oligomer extracts obtained during the extraction with water of the polymer product obtained in the production of polyamides, the water content of the reaction mixture being in the range from 0.5 to 13% by weight comprises conducting the reaction in the presence of metal oxides, beta-zeolites, sheet-silicates or silica gels, which may be doped, as heterogeneous catalysts, the heterogeneous catalysts being used in the form which permits mechanical removal from the reaction mixture and are removed from the reaction mixture in the course of the polymerization or after it has ended.
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公开(公告)号：TR200001513T2
公开(公告)日：2001-07-23
申请号：TR200001513
申请日：1998-11-24
Applicant: BASF AG
Inventor： HUNGER HANS-HARALD , LUDWIG ALFONS , PIPPER GUNTER , SAUER THOMAS , WILMS AXEL , NEUBERG RAINER
Abstract: The disclosure is a process for preparing polyamides by concentrating the wash water extract from the extraction of polyamide to an extractables content of not more than 85% by weight, adding fresh lactam down to a water content of from 0.5 to 13% by weight, and effecting at least one adiabatic expansion during the polymerization.
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公开(公告)号：CA2394013A1
公开(公告)日：2001-06-07
申请号：CA2394013
申请日：2000-11-29
Applicant: BASF AG
Inventor： PIPPER GUNTER , LUDWIG ALFONS , PILLE RAGNHILD
Abstract: The invention relates to a device (1) for drying and thermally treating granulates with an inert gas stream. Said device has a cuboidal base body (2 ) comprising an inlet (3) for the granulate in the upper part and an outlet (4 ) in the lower part. Said device has an inlet (5) on a side surface and an outlet (6) on the opposite side surfaces of the cuboidal base body (2) for t he inert gas stream. Said device also comprises a distribution and retaining device (7, 8) in the region of the inlet (5) and outlet (6) of the inert gas stream which substantially extend over the total vertical cross-section of t he cuboidal base body (2).
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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
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.
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公开(公告)号：HU0100185A2
公开(公告)日：2001-05-28
申请号：HU0100185
申请日：1998-11-24
Applicant: BASF AG
Inventor： HUENGER HANS-HARALD , LUDWIG ALFONS , NEUBERG RAINER , PIPPER GUNTER , SAUER THOMAS , WILMS AXEL
Abstract: The disclosure is a process for preparing polyamides by concentrating the wash water extract from the extraction of polyamide to an extractables content of not more than 85% by weight, adding fresh lactam down to a water content of from 0.5 to 13% by weight, and effecting at least one adiabatic expansion during the polymerization.
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