公开(公告)号：CA2492155A1

公开(公告)日：2004-01-22

申请号：CA2492155

申请日：2003-07-07

Applicant: BASF AG

Inventor： KAIBEL GERD ,  DECKERT PETRA ,  DOMSCHKE THOMAS ,  MERGER MARTIN ,  SAUER FRIEDRICH

IPC: C07D307/62

Abstract: The invention relates to a method for the separation of ascorbic acid from a mixture containing ascorbic acid and 2-keto-L-gulonic acid in a polar, preferably aqueous solvent, by means of liquid/liquid extraction using an amide. The method preferably also comprises steps for the back-extraction of the ascorbic acid, recycling of the extraction solvent and/or the back extraction solvent and for isolation of the ascorbic acid from the back extraction solvent. The invention further relates to a method for the production of ascorbic acid from KGA and isolation of the ascorbic acid so produced.

公开(公告)号：DE10049338A1

公开(公告)日：2002-04-11

申请号：DE10049338

申请日：2000-10-05

Applicant: BASF AG

Inventor： KAIBEL GERD ,  DOMSCHKE THOMAS ,  HAAKE MATHIAS ,  KELLER HARALD ,  SCHWAB EKKEHARD ,  OOST CARSTEN

IPC: B01J33/00 ,  B01J35/02 ,  B01J37/02 ,  C07B61/00 ,  C07C29/17 ,  C07C33/025 ,  C07C33/035 ,  B01J35/10 ,  C07B35/02 ,  C07B31/00

Abstract: Micro-structured, self-cleaning, catalytically-active surface with peaks and hollows contains a catalytically-active material in the hollows. Independent claims are also included forthe following: (a) formed catalyst bodies with an active surface; (b) a method for the production of catalyst surfaces and formed catalysts as above by powder-coating the surface of a support with particles in the size range 0.05-200 microns and then coating with a catalytically-active material; (c) an alternative method comprises: (i) optionally coating the support with a metal primer by layer deposition; (ii) applying a first layer of metal with embedded particles (0.05-200 microns) to the surface of the support or the primer layer by deposition from a solution containing these dispersed particles and (iii) coating with a catalytically-active second layer; and (d) micro-structured, self-cleaning, catalytically-active surfaces and catalysts obtained by these methods.

公开(公告)号：DE10047162A1

公开(公告)日：2002-04-11

申请号：DE10047162

申请日：2000-09-22

Applicant: BASF AG

Inventor： OOST CARSTEN ,  DOMSCHKE THOMAS ,  KAIBEL GERD

IPC: B01D9/00 ,  B08B17/06 ,  B29C59/00

Abstract: Crystallisation or precipitation apparatus with reduced deposition of crystals on its surfaces has a microstructure of ribs and grooves on the surfaces which contact crystallisate, solutions or mother liquors, so that they are self-cleaning. An Independent claim is included for a method for crystallisation or precipitation from solutions using the apparatus.

公开(公告)号：DE10032264A1

公开(公告)日：2002-01-17

申请号：DE10032264

申请日：2000-07-03

Applicant: BASF AG

Inventor： SIGWART CHRISTOPH ,  DOMSCHKE THOMAS ,  FISCHER ROLF HARTMUTH ,  HAUBNER MARTIN ,  STEIN FRANK

IPC: C08G65/20 ,  C08G65/30 ,  C07C41/01 ,  C07C41/58 ,  C07C43/10

Abstract: The invention relates to a method for single-step production of polytetrahydrofurane or tetrahydrofurane copolymers by polymerizing tetrahydrofurane on an acid, heterogeneous catalyst in the presence of at least one telogen and/or comonomer from the group of alpha, omega-diols, water, polytetrahydrofurane having a molecular weight of 200 - 700 Dalton and/or cyclic ether, characterized in that a) the catalyst-free polymerization discharge is divided up into at least one distillation step forming a residue containing the polymerization product and at least one tetrahydrofurane fraction, and the tetrahydrofurane fraction is at least partially recycled in the polymerization, and b) low-molecular polytetrahydrofurane and/or tetrahydrofurane copolymers having an average molecular weight of 200-700 Dalton are separated from the distillation residue of step a) and PTHF and/or THF copolymers having an average molecular weight of 650 - 5000 Dalton are obtained, and c) at least one partial amount of the separated low-molecular polytetrahydrofurane and/or tetrahydrofurane copolymer having an average molecular weight of 200 700 Dalton is recyled in the polymerization.

公开(公告)号：DE19858120A1

公开(公告)日：2000-06-21

申请号：DE19858120

申请日：1998-12-16

Applicant: BASF AG

Inventor： DOMSCHKE THOMAS ,  JOA ANDREAS ,  STEINEBRUNNER KLAUS

IPC: F23G7/04 ,  C02F1/10 ,  C02F1/72 ,  F23C9/00 ,  F23D17/00 ,  F23G7/00 ,  F23L7/00

公开(公告)号：DE59503998D1

公开(公告)日：1998-11-26

申请号：DE59503998

申请日：1995-07-05

Applicant: BASF AG

Inventor： BOTT KASPAR ,  DOMSCHKE THOMAS ,  BOHN MICHAEL

IPC: B01J19/18 ,  C07C231/08 ,  C07C233/20