中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

179 records (took 0.024 seconds)

    61.
    发明专利
    未知

    公开(公告)号：AT485287T

    公开(公告)日：2010-11-15

    申请号：AT08718289

    申请日：2008-03-27

    Applicant: BASF SE

    Inventor： STROEFER ECKHARD ,  LANG NEVEN ,  SIEGERT MARKUS ,  HASSE HANS

    IPC: C07D323/06

    Abstract: A process for preparing trioxane from trioxymethylene glycol dimethyl ether (POMDMEn=3) by converting trioxymethylene glycol dimethyl ether in the presence of an acidic catalyst and subsequent distillative workup of the reaction mixture, comprising the steps of: a) feeding trioxymethylene glycol dimethyl ether (POMDMEn=3) or a mixture comprising trioxymethylene glycol dimethyl ether into a reactor and converting it in the presence of an acidic catalyst to a mixture a comprising trioxane, formaldehyde, water, methylene glycol (MG), polyoxymethylene glycols (MGn>1), methanol, hemiformals (HF), methylal (POMDMEn=1) and polyoxymethylene glycol dimethyl ethers (POMDMEn>1); b) distillatively separating the reaction mixture a into a low boiler fraction b1 comprising formaldehyde, water, methylene glycol, methanol, hemiformal (HFn=1), methylal and dioxymethylene glycol dimethyl ether (POMDMEn=2), and a high boiler fraction b2 comprising trioxane, polyoxymethylene glycols (MGn>1), hemiformals (HFn>1) and polyoxymethylene glycol dimethyl ethers (POMDMEn>2); c) distillatively separating the high boiler fraction b2 into a low boiler fraction c1 comprising trioxane, and a high boiler fraction c2 comprising polyoxymethylene glycols (MGn>1), hemiformals (HFn>1) and polyoxymethylene glycol dimethyl ethers (POMDMEn>2).

    67.
    发明专利
    未知

    公开(公告)号：DE502004010159D1

    公开(公告)日：2009-11-12

    申请号：DE502004010159

    申请日：2004-02-20

    Applicant: BASF SE

    Inventor： BRODHAGEN ANDREAS ,  SOHN MARTIN ,  NEVEJANS FILIP ,  STROEFER ECKHARD ,  WOELFERT ANDREAS ,  OEHLENSCHLAEGER STEFFEN

    IPC: C07C263/10 ,  B01J19/24 ,  C07C265/14

    Abstract: Production of polyisocyanates comprises mixing an amine with phosgene, reacting the amine with the phosgene in a tubular reactor, and passing the reactor effluent to a distillation column. Independent claims are also included for: (1) tubular reactor consisting of one or more horizontal and/or vertical segments connected together by sections whose diameter is smaller than that of the narrowest horizontal or vertical segment; (2) use of the above reactor for carrying out gas-liquid reactions; and (3) use of the above reactor for producing isocyanates by reacting primary amines with phosgene.

    68.
    发明专利
    未知

    公开(公告)号：DE502004009159D1

    公开(公告)日：2009-04-23

    申请号：DE502004009159

    申请日：2004-03-03

    Applicant: BASF SE

    Inventor： STROEFER ECKHARD ,  LANG NEVEN ,  LICHTFERS UTE ,  STEINBRENNER ULRICH ,  HASSE HANS

    IPC: B01D1/22 ,  B01D1/30 ,  C08G2/08

    Abstract: A method for separating a liquid mixture containing readily-volatile and sparingly-volatile components involves using a film evaporator with a heat-exchange surface which is coated with material which catalyses the formation of readily-volatile component(s) in the liquid film. A method for separating a liquid mixture containing (A) readily-volatile and (B) sparingly-volatile components in a film evaporator by (i) producing a continuous stream of a liquid starting mixture, (ii) producing a liquid film from the mixture and bringing it into contact with a heat-exchange surface of the evaporator, and (iii) partly evaporating the film to give two gas streams rich in (A) and (B) respectively. In this method, (iv) the heat-exchange surface is coated with a catalytic material and (v) a chemical reaction in which (A) is/are formed is catalysed in the liquid film. An independent claim is also included for a film evaporator with a heat-exchanger wall which is coated with catalytic material.

    70.
    发明专利
    未知

    公开(公告)号：DE502006001408D1

    公开(公告)日：2008-10-02

    申请号：DE502006001408

    申请日：2006-06-14

    Applicant: BASF SE

    Inventor： FIENE MARTIN ,  BOEHLING RALF ,  STROEFER ECKHARD ,  VOGEL HERBERT ,  MESRI FATIMA

    IPC: C07C263/20 ,  C07C265/10

    Abstract: The present invention provides a process for working up isocyanate adducts, comprising the steps of a) reacting the isocyanate adducts with pure ammonia, b) working up the reaction products obtained in step a), c) recycling the amines formed into the isocyanate production.

Patent Agency Ranking