公开(公告)号：DE50005659D1

公开(公告)日：2004-04-22

申请号：DE50005659

申请日：2000-07-12

Applicant: BASF AG

Inventor： BOETTCHER DR ,  BURST WOLFRAM

IPC: C07B61/00 ,  C07H1/00 ,  C07H7/027

公开(公告)号：DE19954511A1

公开(公告)日：2001-05-17

申请号：DE19954511

申请日：1999-11-12

Applicant: BASF AG

Inventor： BURST WOLFRAM ,  KAIBEL GERD ,  BOETTCHER ANDREAS ,  KESSLER VERONIQUE ,  KUNTZE THOMAS

IPC: B01D3/32 ,  C07B61/00 ,  C07D307/62

Abstract: Continuous production of alkali metal L-ascorbates (I) comprises: a ) esterifying 2-keto-L-gulonic acid or diacetone 2-keto-L-gulonic acid with a C1-C10 alcohol in the presence of an acid catalyst; and (b) rearranging the resulting ester in the presence of an alkali metal C1-C10 alkoxide.

公开(公告)号：DE19938980A1

公开(公告)日：2001-02-22

申请号：DE19938980

申请日：1999-08-19

Applicant: BASF AG

Inventor： BOETTCHER ANDREAS ,  BURST WOLFRAM

IPC: C07B61/00 ,  C07H1/00 ,  C07H7/027

公开(公告)号：DE19810671A1

公开(公告)日：1999-09-16

申请号：DE19810671

申请日：1998-03-12

Applicant: BASF AG

Inventor： RUFF DETLEF ,  BURST WOLFRAM ,  KAISER WULF ,  STROEZEL MANFRED

IPC: C07C45/72 ,  C07C45/74 ,  C07C49/603 ,  C07C49/543 ,  C07C45/68 ,  C07C45/45

Abstract: 2,5,6-trimethyl-cyclohex-2-en-1-one (I) is prepared by continuously pumping diethylketone (II), crotonaldehyde (III) and an aqueous strong base through a pressure vessel in such a fashion that the reaction temperature is 150-350 degrees C and the average residence time in the pressure vessel is only 0.1 seconds to 20 minutes. Preparation of 2,5,6-trimethyl-cyclohex-2-en-1-one (I) comprises reaction of (i) diethylketone (II) with (ii) crotonaldehyde (III) (or a compound which is converted to (III) under the selected reaction conditions), in the presence of basic agents, at elevated temperatures. Component (ii) (1 mol), component (i) (5-30 mol) and an aqueous solution or suspension of a strong base are pumped continuously, via separate supply points or in the form of a mixture, into an optionally heated pressure vessel which can guarantee intensive mixing. The components are pumped to the vessel in such a fashion that the reaction temperature is 150-350 degrees C and the average residence time in the pressure vessel is only 0.1 seconds to 20 minutes.

公开(公告)号：DE19605286A1

公开(公告)日：1997-08-14

申请号：DE19605286

申请日：1996-02-13

Applicant: BASF AG

Inventor： BURST WOLFRAM ,  HARTMANN HORST ,  KAISER WULF DR

IPC: B01J19/32 ,  C07C17/38 ,  C07D311/72 ,  B01D3/00

Abstract: Packing elements which are subjected to low pressure losses and which are used in fractional distillation columns, have the same diameter as that of the column inner diameter, and a height of 40 to 300mm. The elements consist of dimensionally stable layers (2,3) with an ordered structure. They are made of cloth or cloth-like material with a specific surface of 2000m /m . The novelty is that: (a) the contacting, deformed layers of cloth or cloth-like material pref. metal cloth, are arranged to form a number of narrow flow ducts, pref. triangular, rectangular, square, or equilateral hexagonal flow ducts; (b) the angle of inclination (1) of the teeth in the individual cloth layers (2,3) of the packing towards the column axis is 0 to 25 degrees, pref. 3 to 14 degrees; (c) wires or thin rods (4) are mounted as required between th cloth layers (2,3), or the cloth layers (2,3) are rigidly connected at some points of contact, providing mechanical stability. Also claimed is a process for obtaining pure substances from mixtures by rectification using the packing elements described.

公开(公告)号：DE4223805A1

公开(公告)日：1993-01-28

申请号：DE4223805

申请日：1992-07-20

Applicant: BASF AG

Inventor： BURST WOLFRAM ,  WINTER MANFRED

IPC: B01F15/06 ,  B65D6/10

Abstract: Mixing vessel of a stirrer comprises a double skinned pan (1,2) and connecting nozzles (6) to allow passage of a heating or cooling medium. Novelty is that the flow annulus (3) is divided by partitions (4) into vertical segments (5) each possessing two flow connections (6). Jacket segments are preferably of differing sizes to allow matching with operating volume and specific properties required by individual materials and batch sizes. USE/ADVANTAGE - Avoidance of scale up problems, which could lead to crystal deposition, baked-on solids, etc. by provision of a stepwise variable, jacketted heat transfer area.

公开(公告)号：DE3527338A1

公开(公告)日：1987-02-05

申请号：DE3527338

申请日：1985-07-31

Applicant: BASF AG

Inventor： MUELLER JOSEF DR ,  WIERSDORFF WALTER-WIELANT DR ,  BURST WOLFRAM ,  DRALLE HEINZ DR ,  SCHAEFFNER ERNST DR ,  STEINKAMP ROLF DR

IPC: C07C255/53 ,  C07C121/75 ,  C07C120/04

Abstract: Veratryl cyanide is prepared by chloromethylating veratrol in solution in toluene and then reacting the resulting veratryl chloride with from 1 to 5 moles of an alkali metal cyanide, by a process in which the toluene from the chloromethylation is not removed for the reaction with cyanide, and from 3 to 25% by weight, based on veratryl chloride, of water, from 5 to 50% by weight, based on toluene, of a ketone of 3 to 6 carbon atoms and from 0.1 to 10% by weight, based on veratryl chloride, of a phase transfer catalyst are added before the reaction with cyanide.