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：PT941979E

公开(公告)日：2002-11-29

申请号：PT99104411

申请日：1999-03-05

Applicant: BASF AG

Inventor： SIEGEL WOLFGANG ,  THERRE JORG ,  KIEFER MATTHIAS ,  PAHL MELANIE ,  AQUILA WERNER ,  SCHAFER-LUDERSSEN ULRICH

IPC: C07C29/56 ,  C07C29/80 ,  C07C33/02 ,  C07C33/03

Abstract: Continuous production of dimethyl vinyl carbinol (DMVC) comprises reaction of prenol with an aqueous solution of a protonic acid in the bottom or upper part of a rectification column while distilling off the DMVC as an azeotropic mixture with water under specified conditions. Continuous production of dimethyl vinyl carbinol (DMVC) by reaction of prenol with an aqueous solution of a protonic acid in the bottom or upper part of a rectification column while distilling off the DMVC as an azeotropic mixture with water is performed in such a way that (a) the amount of liquid two-phase mixture formed during the reaction is minimized, (b) the DMVC is distilled off with a reflux ratio of at least 2, and (c) the reaction volume (V in ml) and/or the amount of prenol added per hour (P in ml/hour) and/or the proton concentration in the reaction mixture (C in moles/liter) is such that VC/P = 0.001-1 h.mol/l.