公开(公告)号：SK1922003A3

公开(公告)日：2003-08-05

申请号：SK1922003

申请日：2001-08-16

Applicant: BASF AG

Inventor： ISAK HEINZ ,  SENDHOFF NORBERT ,  SCHUTZ FRANZ ,  THERRE JORG ,  DROGEMULLER MICHAEL ,  FRANKE DIRK ,  MUNZINGER MANFRED ,  WECK ALEXANDER ,  BURKART KIRSTEN

IPC: A01N25/12 ,  A01N43/88 ,  C07D285/34

Abstract: Described is a process for the preparation of a particulate tetrahydro-3,5-dimethyl-1,3,5-thiadiazine-2-thione product by combining a first aqueous solution comprising methylammonium N-methyldithiocarbamate with a second aqueous solution comprising formaldehyde, followed by separation and drying of the resulting solid, which comprises combining the first and the second aqueous solutions in such a way that the ratio between the concentrations of dithiocarbamate functions and of formaldehyde is essentially constant in the reaction mixture over time during the duration of the reaction.

公开(公告)号：CA2418972A1

公开(公告)日：2003-02-11

申请号：CA2418972

申请日：2001-08-16

Applicant: BASF AG

Inventor： BURKART KIRSTEN ,  WECK ALEXANDER ,  ISAK HEINZ ,  SENDHOFF NORBERT ,  FRANKE DIRK ,  MUNZINGER MANFRED ,  THERRE JORG ,  DROGEMULLER MICHAEL ,  SCHUTZ FRANZ

IPC: A01N25/12 ,  A01N43/88 ,  C07D285/34

Abstract: A method for the production of a particle-containing preparation of tetrahyd ro- 3,5-dimethyl-1,3,5-thiadiazin-2-thione, by combination of a first aqueous solution containing methylammonium-N-methyldithiocarbamate with a second solution containing formaldehyde and separation and drying of the solid form ed is disclosed. The invention is characterised in that the first and second solutions are combined such that over the duration of the reaction the ratio of the concentration of dithiocarbamate functions and formaldehyde in the reaction mixture remains essentially constant over time.

公开(公告)号：DE19959153A1

公开(公告)日：2001-06-21

申请号：DE19959153

申请日：1999-12-08

Applicant: BASF AG

Inventor： GUTH JOSEF ,  FRIEDRICH HOLGER ,  STERZEL HANS-JOSEF ,  KAIBEL GERD ,  BURKART KIRSTEN ,  HOFFMANN ELKE

IPC: B01D1/28 ,  C07C29/70 ,  C07C29/80 ,  C07C31/30

Abstract: The invention relates to a method for producing alkali methylates from an aqueous alkaline lye that is optionally mixed with methanol and methanol in a reaction column, said column comprising at least 5, preferably 15 to 30 theoretical trays between the inlet of the alkaline lye and the site of addition of the methanol. According to the inventive method, the vapor methanol-water mixture formed during the reaction is separated in a reaction column. According to an embodiment of the invention, the reaction column that is configured as a bubble-tray, valve-tray or sieve-plate column is provided with trays, each letting through maximally 5 %, preferably