Patents by Inventor Ludwig Deibele

Ludwig Deibele 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).

  • Process for stripping polymer polyols
    Patent number: 7790804
    Abstract: The invention provides a process for the purification of polymer polyols that ensures a reduction of acrylonitrile, styrene as well as the residual amounts of optionally used chain regulator, and of occurring recombination products of the initiator when azo initiators are used, to levels of <25 ppm of acrylonitrile, <50 ppm styrene, <50 ppm chain regulator and <280 ppm of recombination products by stripping using packed columns.
    Type: Grant
    Filed: June 22, 2007
    Date of Patent: September 7, 2010
    Assignee: Bayer MaterialScience AG
    Inventors: Michael Brockelt, Ludwig Deibele, Manfred Dietrich, Markus Hadley, Jan Thomas Leu, Guido Naberfeld, Ralf Dohrn
  • PROCESS FOR THE MILD DISTILLATIVE SEPARATION OF MIXTURES
    Publication number: 20090032389
    Abstract: The invention relates to a semibatchwise process for the mild distillative separation of mixtures, in a first stage a column being supplied continuously with a feed and the feed being separated at least into different fractions, one of the fractions being removed continuously into a container, and, in a second step, the fraction removed into the container being recycled to the column and being separated again batchwise into different fractions.
    Type: Application
    Filed: September 9, 2008
    Publication date: February 5, 2009
    Applicant: LANXESS DEUTSCHLAND GMBH
    Inventors: Ludwig Deibele, Dieter Heinz, Jan Thomas Leu, Johannes-Peter Schafer, Kai Fahrenkamp, Wolfgang Scheinert, Thomas Schilling, Paul Wagner
  • Process for the mild distillative separation of mixtures
    Patent number: 7435319
    Abstract: The invention relates to a semibatchwise process for the mild distillative separation of mixtures, in a first stage a column being supplied continuously with a feed and the feed being separated at least into different fractions, one of the fractions being removed continuously into a container, and, in a second step, the fraction removed into the container being recycled to the column and being separated again batchwise into different fractions.
    Type: Grant
    Filed: May 12, 2003
    Date of Patent: October 14, 2008
    Assignee: LANXESS Deutschland GmbH
    Inventors: Ludwig Deibele, Dieter Heinz, Jan Thomas Leu, Johannes-Peter Schäfer, Kai Fahrenkamp, Wolfgang Scheinert, Thomas Schilling, Paul Wagner
  • Process for stripping polymer polyols
    Publication number: 20080033139
    Abstract: The invention relates to a process for the purification of polymer polyols by stripping using packed columns.
    Type: Application
    Filed: June 22, 2007
    Publication date: February 7, 2008
    Inventors: Michael Brockelt, Ludwig Deibele, Manfred Dietrich, Markus Hadley, Jan Leu, Guido Naberfeld, Ralf Dohrn
  • Process for the mild distillative separation of mixtures
    Publication number: 20040020757
    Abstract: The invention relates to a semibatchwise process for the mild distillative separation of mixtures, in a first stage a column being supplied continuously with a feed and the feed being separated at least into different fractions, one of the fractions being removed continuously into a container, and, in a second step, the fraction removed into the container being recycled to the column and being separated again batchwise into different fractions.
    Type: Application
    Filed: May 12, 2003
    Publication date: February 5, 2004
    Inventors: Ludwig Deibele, Dieter Heinz, Jan Thomas Leu, Johannes-Peter Schafer, Kai Fahrenkamp, Wolfgang Scheinert, Thomas Schilling, Paul Wagner
  • Method and continous production of a solution of rubbers in vinyl-aromatic monomers
    Publication number: 20030083450
    Abstract: Impact modified styrene polymers can be prepared by a continuous process for the production of a solution of rubber in vinyl aromatic monomers.
    Type: Application
    Filed: October 11, 2002
    Publication date: May 1, 2003
    Inventors: Gisbert Michels, Ludwig Deibele, Markus Hadley, Torsten Hauschild, Ralph Ostarek
  • Process for removing by-products from diurethanes
    Patent number: 5646328
    Abstract: Low-boiling by-products are removed from diurethanes prepared by a phosgene-free process by carrier vapor distillation using alcohol vapor, preferably the vapor of the basic alcohol found in the diurethane, as the carrier vapor. The diurethanes freed of low-boiling by-products in this manner may be thermally decomposed to produce diisocyanates.
    Type: Grant
    Filed: June 20, 1996
    Date of Patent: July 8, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ludwig Deibele, Oswald Wilmes, Jurgen Dahmer
  • Distillation column with vaporous sidestream removal
    Patent number: 5336376
    Abstract: In a distillation column with vaporous sidestream removal, the vaporous product removed is condensed in a condenser. The vapor pipe provided for the removal of product opens into a dip tank of which the upper end is connected to the condenser while its lower end is connected to a discharge pump. Inert gas present in the condensate is returned to the column above the sidestream removal through an inert gas pipe arranged at the upper end of the condenser.
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: August 9, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Siegfried Taurat, Heinrich Steude, Ludwig Deibele, Heinz-Jurgen Alpers
  • Process for the isolation of pure dinitrotoluenes
    Patent number: 5149890
    Abstract: Pure or substantially enriched 2,4- and 2,6-dinitrotoluene can be isolated from a mixture containing these isomers if such a mixture is distilled under a pressure of 0.5 to 20 mbar at a temperature of 80.degree. to 200.degree. C. with exclusion of reducing conditions.
    Type: Grant
    Filed: November 1, 1991
    Date of Patent: September 22, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gunther Rauchschwalbe, Heinz-Ulrich Blank, Ludwig Deibele, Kaspar Hallenberger, Gerhard Ruffert
  • Process for the preparation of sump product
    Patent number: 4180438
    Abstract: A thin layer evaporator which has a vapor lock above the solvent inlet is used for the preparation of distillate-free sump product which is obtained as solid from the concentration of solutions of water, organic substances and non-volatile constituents and dissolved in solvents.
    Type: Grant
    Filed: September 16, 1976
    Date of Patent: December 25, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Walter Brandt, Ludwig Deibele, Kurt Toepffer, Karl-Heinz Steinacker
  • Process for the purification of epsilon-caprolactam
    Patent number: 4148793
    Abstract: Process for the removal of residues of solvent from crystallized .epsilon.-caprolactam, wherein the major quantity of solvent is removed in a first stage by distillation in the presence of water in an amount so that the water content of the residue of the first stage is from 0.5 to 6% by weight, and in a second stage by distilling water and any residues of solvent still present.
    Type: Grant
    Filed: September 9, 1977
    Date of Patent: April 10, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Harry Danziger, Ludwig Deibele, Bernd-Ulrich Kaiser