Patents by Inventor Aik Meam Tan

Aik Meam Tan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9873658
    Abstract: The present invention relates to a process for hydrogenating 4,4?-methylenedianiline and/or polymeric MDA with hydrogen in the presence of a catalyst comprising ruthenium on a zirconium oxide support material, and also to the use of a catalyst comprising ruthenium on a zirconium oxide support material for hydrogenating 4,4?-methylenedianiline and/or polymeric MDA.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: January 23, 2018
    Assignee: BASF SE
    Inventors: Andreas Weickgenannt, Bernd Bastian Schaack, Barbara Wucher, Alexander Panchenko, Frank Hettche, Martin Bock, Aik Meam Tan, Kirsten Dahmen
  • Publication number: 20160326094
    Abstract: The present invention relates to a process for hydrogenating 4,4?-methylenedianiline and/or polymeric MDA with hydrogen in the presence of a catalyst comprising ruthenium on a zirconium oxide support material, and also to the use of a catalyst comprising ruthenium on a zirconium oxide support material for hydrogenating 4,4?-methylenedianiline and/or polymeric MDA.
    Type: Application
    Filed: December 10, 2014
    Publication date: November 10, 2016
    Applicant: BASF SE
    Inventors: Andreas WEICKGENANNT, Bernd Bastian SCHAACK, Barbara WUCHER, Alexander PANCHENKO, Frank HETTCHE, Martin BOCK, Aik Meam TAN, Kirsten DAHMEN
  • Patent number: 9315479
    Abstract: Process for preparing pyrrolidine of the formula I by reacting 1,4-butanediol (BDO) of the formula II with ammonia in the presence of hydrogen and a supported, metal-containing catalyst, wherein the catalytically active mass of the catalyst, prior to its reduction with hydrogen, comprises oxygen-containing compounds of aluminum, copper, nickel and cobalt and in the range from 0.2 to 5.0% by weight of oxygen-containing compounds of tin, calculated as SnO, and the reaction is carried out in the liquid phase at an absolute pressure in the range from 160 to 220 bar, a temperature in the range from 160 to 230° C., using ammonia in a molar ratio to BDO used of from 5 to 50 and in the presence of 1.0 to 4.5% by weight of hydrogen, based on the amount of BDO used.
    Type: Grant
    Filed: July 12, 2013
    Date of Patent: April 19, 2016
    Assignee: BASF SE
    Inventors: Roland Bou Chedid, Johann-Peter Melder, Roman Dostalek, Jörg Pastre, Aik Meam Tan
  • Publication number: 20140018547
    Abstract: Process for preparing pyrrolidine of the formula I by reacting 1,4-butanediol (BDO) of the formula II with ammonia in the presence of hydrogen and a supported, metal-containing catalyst, wherein the catalytically active mass of the catalyst, prior to its reduction with hydrogen, comprises oxygen-containing compounds of aluminum, copper, nickel and cobalt and in the range from 0.2 to 5.0% by weight of oxygen-containing compounds of tin, calculated as SnO, and the reaction is carried out in the liquid phase at an absolute pressure in the range from 160 to 220 bar, a temperature in the range from 160 to 230° C., using ammonia in a molar ratio to BDO used of from 5 to 50 and in the presence of 1.0 to 4.5% by weight of hydrogen, based on the amount of BDO used.
    Type: Application
    Filed: July 12, 2013
    Publication date: January 16, 2014
    Inventors: Roland Bou Chedid, Johann-Peter Melder, Roman Dostalek, Jörg Pastre, Aik Meam Tan