公开(公告)号：DE10116316A1

公开(公告)日：2002-10-24

申请号：DE10116316

申请日：2001-04-02

Applicant: BASF AG

Inventor： STROEFER ECKHARD ,  SOHN MARTIN ,  LANGENSIEPEN HANS-WERNER ,  MUELLER CHRISTIAN ,  KRUG GEORG ,  KEMPER REINHARD

IPC: C07C209/78 ,  C07C211/50 ,  C07C209/60

Abstract: A process for the production of 4,4'-diaminoditolylmethane comprises reaction of o-toluidine with formaldehyde in the presence of an acid catalyst whereby the ratio of acid catalyst to o-toluidine is 0.8-1.2 equivalents of acid per mole of o-toluidine. providing a process for the production of 4,4'-diaminoditolylmethane.

公开(公告)号：DE10027778A1

公开(公告)日：2001-12-13

申请号：DE10027778

申请日：2000-06-07

Applicant: BASF AG

Inventor： STROEFER ECKHARD ,  MUELLER CHRISTIAN ,  SOHN MARTIN ,  KAIBEL GERD

IPC: C08G4/00 ,  C08G12/06 ,  C08L59/00 ,  C08L61/22 ,  C08L61/32

Abstract: Production of amine-formaldehyde condensate involves fractionating a mixture of polyoxymethylene glycols, formaldehyde, methylene glycol and water in a reaction column and reacting the reactive fraction with a countercurrent of amine in the same column. Production of amine-formaldehyde condensates (I) by reacting: (a) amine(s); with (b) a mixture containing: (i) poly-oxymethylene glycols; (ii) monomeric formaldehyde; (iii) methylene glycol; and (iv) water. The method involves fractionation of mixture the, followed by reaction with the amine in a reaction column. The amine and that part of the fractionated mixture (b) which reacts with (a) move in countercurrent to one another.

公开(公告)号：DE19857409A1

公开(公告)日：2000-06-15

申请号：DE19857409

申请日：1998-12-12

Applicant: BASF AG

Inventor： SANDER MICHAEL ,  PENZEL ULRICH ,  SCHWARZ HANS VOLKMAR ,  STROEFER ECKHARD ,  STUETZER DIETER ,  MUELLER JOERN ,  MAURER MARKUS

IPC: B01J10/00 ,  B01J19/00 ,  B01J19/24 ,  B01J19/26 ,  C07C209/36 ,  C07C211/51 ,  C07B43/04 ,  C07C209/32

Abstract: The production of amines (I) by hydrogenation of nitro compounds (II), carried out in a vertical reactor with length greater than its diameter. It has a spray at the top for introducing educts and reaction mixture and an outlet through which the reaction mixture is pumped into an external cycle. The circulation is reversed in the lower zone of the reactor.

公开(公告)号：DE19855959A1

公开(公告)日：2000-06-08

申请号：DE19855959

申请日：1998-12-04

Applicant: BASF AG

Inventor： PFEFFINGER JOACHIM ,  STROEFER ECKHARD

IPC: C08G18/02 ,  C07C263/04 ,  C07C265/04 ,  C07C263/18

Abstract: Preparation of isocyanate by thermal cleavage of the corresponding urethane in the steps: (a) preparation of urethane by reaction of the corresponding amine with urea and alcohol, (b) purification of the urethane by removal of the side products and impurities, (c) thermal cleavage of the urethane into isocyanate and alcohol, and (d) working up of the isocyanate is new. In purification of the urethane, components of the reaction mixture which are lower boiling than the urethane are distilled off, part of the urethane is removed from the reaction mixture by distillation under reduced pressure, the urethane is cleaved, the remaining sump fraction is heat treated in a rotary reactor, with cleavage of the urethane remaining in the sump fraction, and the isocyanate and alcohol cleavage products are drawn off as vapors.

公开(公告)号：DE19820114A1

公开(公告)日：1999-11-11

申请号：DE19820114

申请日：1998-05-06

Applicant: BASF AG

Inventor： PFEFFINGER JOACHIM ,  PFAB PETER ,  STROEFER ECKHARD

IPC: C07C263/04 ,  C07C263/20 ,  C07C265/14 ,  C08G18/72 ,  C07C265/04 ,  C07C265/10 ,  C07C269/04

Abstract: A process for the simultaneous production of (cyclo)aliphatic polyisocyanates comprises mixing the starting materials for isocyanate production via a phosgene free process to form the corresponding isocyanate and the resulting mixture is separated to form the pure isocyanate fraction.

公开(公告)号：DE19817691A1

公开(公告)日：1999-10-28

申请号：DE19817691

申请日：1998-04-21

Applicant: BASF AG

Inventor： PENZEL ULRICH ,  SCHARR VOLKER ,  STAROSTA DIETER ,  BOESEL HILMAR ,  STROEFER ECKHARD ,  PFEFFINGER JOACHIM ,  ABEEL PETER VAN DEN ,  JACOBS JAN ,  NEVEJANS FILIP ,  POPLOW FRANK ,  DOSCH JUERGEN ,  SCHWARZ HANS VOLKMAR ,  NAEUMANN FRITZ ,  PEE WILLY VAN

IPC: C07C263/10 ,  C07C263/20 ,  C07C265/14

Abstract: Surprisingly, the drawbacks of previous processes for the preparation of mixtures containing diphenylmethanediisocyanate and polyphenylene-polymethylene-polyisocyanate, e.g. high cost, excessive HCl stripping time, can be avoided by a two-stage reaction of corresponding mixtures containing diphenylmethane-diamine and polyphenylene-polymethylene-polyamine with phosgene in the presence of inert organic solvent. Mixtures containing diphenylmethanediisocyanate and polyphenylene-polymethylene-polyisocyanate (PMDI) having a decreased content of chlorinated side product and decreased iodine colour index are obtained by two-stage reaction of corresponding mixtures containing diphenylmethanediamine and polyphenylene-polymethylene-polyamine (PMDA) with phosgene in the presence of at least one inert organic solvent. The weight ratio of phosgene to HCl in the dwell time apparatus of the second phosgenation stage is (10-30):1 in the liquid phase and (1-10):1 in the gas phase. An Independent claim is included for mixtures containing diphenylmethanediisocyanate and PMDI obtainable by the above process.

公开(公告)号：DE3687093D1

公开(公告)日：1992-12-17

申请号：DE3687093

申请日：1986-07-04

Applicant: BASF AG

Inventor： STROEFER ECKHARD ,  ROHR WOLFGANG ,  ROTERMUND GERHARD W ,  FISCHER ROLF ,  NEUDERT REINHARD

IPC: C07D231/06 ,  C07D231/54 ,  C07D231/56

Abstract: Prodn. of 1-pyrazolines of formula (I) is effected by (a) stirring a 10-30% aq. soln. of a 1,3-diaminopropane of formula (II) while simultaneously adding a 5-22 wt.% aq. hypochlorite soln. and a 20-50 wt.% aq. soln. of a hydro-peroxide of formula (III) in a hypochlorite: (III) molar ratio of 1:0.5-1.5, the temp. not being allowed to exceed 60 deg. C; (b) rapidly extracting (I) with a hydrophobic organic solvent at room temp.; and (c) distilling the extract in vacuo at a temp. below 100 deg.C: R1-R6 = H or 1-3C alkyl, or 2 such gps. on the same or adjacent C atoms linked to form 3-5C alkylene; R = H, 1-5C alkyl or 2-5C aliphatic acyl. Pref. a 15-19% hypochlorite soln. and a 40-50% H2O2 soln. are added at a rate such that the ClO- and H2O2 concn. never exceeds 5%.