Patents by Inventor Johann Rechner

Johann Rechner 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).

  • Publication number: 20190375635
    Abstract: The invention relates to a method for flexibly controlling the use of hydrochloric acid having an HCl concentration of at least 10 wt %, in particular at a volume flow rate of at least 1 m3/h, obtained from a continuous chemical production process (A). In the method, purified hydrochloric acid (54) from a hydrochloric acid store (E) is optionally fed to a dispatch station (H), an HCl electrolysis station (F) and a chloralkali electrolysis station (L), which are consumption points for the hydrochloric acid, or to a neutralisation station (G) in that if one or more of said consumption points (H, F, L) is not available or if there are bottlenecks at the consumption points (H, F, L), the hydrochloric acid (54) is fed to the neutralisation station (G) and neutralised with concentrated alkali solution (55), in particular with concentrated sodium hydroxide solution, and the resulting salt solution (56) is fed either to the chloralkali process station (L) or to a disposal station (M).
    Type: Application
    Filed: January 17, 2018
    Publication date: December 12, 2019
    Inventors: Andreas Bulan, Johann RECHNER, Rainer WEBER, Juergen HECKE, Wolfgang KERN, Martin LEIPNITZ, Bemd HENNING
  • Patent number: 10435507
    Abstract: The invention relates to polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones.
    Type: Grant
    Filed: October 20, 2017
    Date of Patent: October 8, 2019
    Assignee: COVESTRO DEUTSCHLAND AG
    Inventors: Thomas Koenig, Joerg Kirchhoff, Michael Bierdel, Klemens Kohlgrueber, Johann Rechner, Ing. Johan Vaes, Johan Vanden Eynde, Frank Bruynseels, Bert Ruytinx
  • Publication number: 20190061200
    Abstract: A process for extruding plastic compositions is provided. The process comprises providing a multi-screw extruder with screw elements and conveying, kneading, mixing, degassing or compounding the plastic compositions in the multi-screw extruder using the screw elements.
    Type: Application
    Filed: October 25, 2018
    Publication date: February 28, 2019
    Inventors: Michael Bierdel, Thomas Koenig, Carsten Conzen, Ulrich Liesenfelder, Klemens Kohlgrueber, Reiner Rudolf, Johann Rechner
  • Publication number: 20180105644
    Abstract: The invention relates to polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones.
    Type: Application
    Filed: October 20, 2017
    Publication date: April 19, 2018
    Applicant: Covestro Deutschland AG
    Inventors: Thomas Koenig, Joerg Kirchhoff, Michael Bierdel, Klemens Kohlgrueber, Johann Rechner, Ing. Johan Vaes, Johan Vanden Eynde, Frank Bruynseels, Bert Ruytinx
  • Patent number: 9944008
    Abstract: The invention relates to a process for extruding plastic compositions, in particular polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends with improved optical characteristics, with the assistance of a multi-screw extruder with specific screw geometries.
    Type: Grant
    Filed: May 30, 2009
    Date of Patent: April 17, 2018
    Assignee: COVESTRO DEUTSCHLAND AG
    Inventors: Thomas Koenig, Michael Bierdel, Ulrich Liesenfelder, Klemens Kohlgrüber, Johann Rechner
  • Patent number: 9828464
    Abstract: The invention relates to polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones.
    Type: Grant
    Filed: May 26, 2010
    Date of Patent: November 28, 2017
    Assignee: COVESTRO DEUTSCHLAND AG
    Inventors: Thomas König, Jörg Kirchhoff, Michael Bierdel, Klemens Kohlgrüber, Johann Rechner, Ing. Johan Vaes, Johan Vanden Eynde, Frank Bruynseels, Bert Ruytinx
  • Patent number: 9738025
    Abstract: The invention relates to a process for extruding plastic compositions. The process in particular relates to the conveying, kneading and/or mixing of plastic compositions, in particular of polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends.
    Type: Grant
    Filed: May 30, 2009
    Date of Patent: August 22, 2017
    Assignee: Covestro Deutschland AG
    Inventors: Thomas König, Michael Bierdel, Carsten Conzen, Ulrich Liesenfelder, Klemens Kohlgrüber, Reiner Rudolf, Johann Rechner
  • Patent number: 9040732
    Abstract: The invention provides a process for preparing diaryl carbonates from dialkyl carbonates and aromatic hydroxyl compounds using at least two reaction columns, a process section for recovering the dialkyl carbonate used in the reaction and for removing the alcohol of reaction, one or more process steps for removing the by-products obtained in the process which have a boiling point between that of the dialkyl carbonate and that of the alkyl aryl carbonate formed during the preparation of the diaryl carbonate, and a process step for further purification of the diaryl carbonate obtained from the reaction columns.
    Type: Grant
    Filed: June 12, 2009
    Date of Patent: May 26, 2015
    Assignee: Bayer MaterialScience AG
    Inventors: Andre Düx, Guenter Olf, Kaspar Hallenberger, Georg Ronge, Ricarda Leiberich, Johan Vanden Eynde, Wim Wuytack, Pieter Ooms, Johann Rechner
  • Patent number: 8987446
    Abstract: The invention relates to bimetallic complexes in which the ligand contains a salophen unit which complexes copper, manganese or cobalt and a phenanthroline unit which complexes palladium and the two systems are linked by a continuous conjugated system. The invention further relates to the use of these bimetallic complexes as catalysts for the oxidative carbonylation of aromatic hydroxy compounds to form diaryl carbonates, a process for preparing diaryl carbonates using the bimetallic complex as catalyst and also diaryl carbonates prepared by oxidative carbonylation of aromatic hydroxy compounds using the bimetallic complexes of the invention as catalysts.
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: March 24, 2015
    Assignee: Bayer Intellectual Property GmbH
    Inventors: Christoph Gürtler, Thomas Ernst Müller, Pieter Ooms, Johann Rechner, Friedhelm Risse, Angelina Prokofieva, Franco Doro, Burkhard Köhler, Walter Leitner, Aurel Wolf
  • Patent number: 8952189
    Abstract: The invention relates to a process for preparing diaryl carbonates and/or alkyl aryl carbonates from dialkyl carbonates and aromatic hydroxy compounds using a reactive dividing wall column.
    Type: Grant
    Filed: April 7, 2010
    Date of Patent: February 10, 2015
    Assignee: Bayer MaterialScience AG
    Inventors: Andre Düx, Helmut Mothes, Kaspar Hallenberger, Georg Ronge, Rafael Warsitz, Pieter Ooms, Johann Rechner
  • Patent number: 8882984
    Abstract: A process for preparing diaryl carbonate and utilizing at least part of the process wastewater by increasing the concentration of the wastewater phases containing sodium chloride for the electrolysis by means of osmotic membrane distillation with simultaneous dilution of the sodium hydroxide solution obtained from the electrolysis for the diaryl carbonate production process (diphenyl carbonate process) is described.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: November 11, 2014
    Assignee: Bayer MaerialScience AG
    Inventors: Pieter Ooms, Andreas Bulan, Johann Rechner, Rainer Weber, Michael Traving, Marc Buts, Johan Vanden Eynde
  • Patent number: 8648163
    Abstract: Disclosed are random copoly(phosphonate carbonate)s with the high molecular weight and narrow molecular weight distribution exhibiting a superior combination of properties compared to prior art.
    Type: Grant
    Filed: February 11, 2013
    Date of Patent: February 11, 2014
    Assignees: FRX Polymers, Inc., Bayer Material Science AG
    Inventors: Dieter Freitag, Pin Go, Lawino Kagumba, Stephan Konrad, Helmut-Werner Heuer, Berit Krauter, Pieter Ooms, Michael Prein, Johann Rechner
  • Patent number: 8518231
    Abstract: The invention relates to a process for production of diaryl carbonate combined with the electrolysis of the resultant alkali metal chloride-containing process wastewater. The process according to the invention makes possible, inter alia, improved utilization in electrolysis of the alkali metal chloride-containing solution obtained in the production of diaryl carbonate.
    Type: Grant
    Filed: March 1, 2011
    Date of Patent: August 27, 2013
    Assignee: Bayer Intellectual Property GmbH
    Inventors: Pieter Ooms, Andreas Bulan, Johann Rechner, Rainer Weber, Marc Buts, Johan Vanden Eynde
  • Patent number: 8394912
    Abstract: The invention relates to a process for the pretreatment of material surfaces in order to minimize the interaction between polycarbonate and metal and, in the processing and synthesis of polycarbonate, to obtain a high-quality polymer which in particular does not become discolored and is free of insoluble constituents.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: March 12, 2013
    Assignee: Bayer MaterialScience AG
    Inventors: Frank Doebert, Andreas Stremmel, Christoph Biedron, Stephan Laue, Johann Rechner, Torsten Hagen, Frank Bruynseels, Frank Quaeyhaegens, Johan Decloedt, Paul Van Dorst, Uwe Arndt, Johan Vanden Eynde, Ursula Tracht, Thomas König, Ulrich Liesenfelder
  • Patent number: 8389664
    Abstract: Disclosed are random copoly(phosphonate carbonate)s with the high molecular weight and narrow molecular weight distribution exhibiting a superior combination of properties compared to prior art.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: March 5, 2013
    Assignees: FRX Polymers, Inc., Bayer Material Science AG
    Inventors: Dieter Freitag, Pin Go, Lawino Kagumba, Stephan Konrad, Helmut-Werner Heuer, Berit Krauter, Pieter Ooms, Michael Prein, Johann Rechner
  • Publication number: 20130018186
    Abstract: The invention relates to bimetallic complexes in which the ligand contains a salophen unit which complexes copper, manganese or cobalt and a phenanthroline unit which complexes palladium and the two systems are linked by a continuous conjugated system. The invention further relates to the use of these bimetallic complexes as catalysts for the oxidative carbonylation of aromatic hydroxy compounds to form diaryl carbonates, a process for preparing diaryl carbonates using the bimetallic complex as catalyst and also diaryl carbonates prepared by oxidative carbonylation of aromatic hydroxy compounds using the bimetallic complexes of the invention as catalysts.
    Type: Application
    Filed: December 9, 2010
    Publication date: January 17, 2013
    Applicant: Bayer Intellectual Property GmbH
    Inventors: Christoph Gürtler, Thomas Ernst Müller, Pieter Ooms, Johann Rechner, Friedhelm Risse, Angelina Prokofieva, Franco Doro, Burkhard Köhler, Walter Leitner, Aurel Wolf
  • Patent number: 8354028
    Abstract: A method for separating electrolyte-containing water from an organic phase by means of permeation on a hydrophobic separating means. The permeated organic solution is substantially depleted in water and the retained water is enriched with electrolytes.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: January 15, 2013
    Assignee: Bayer Material Science AG
    Inventors: Helmut Meyer, Guido Naberfeld, Johann Rechner, Rafael Warsitz, Michael Traving, Werner Bäcker, Thomas Elsner, Arno Nennemann, Stephan Bahnmuler, Gerhard Langstein, Julia Hitzbleck, Patrick Theato, Daniel Kessler, Daniel-Gordon Duff, Sascha Plug
  • Patent number: 8304509
    Abstract: The present invention relates to a process for continuously preparing diaryl carbonates from dialkyl carbonates and at least one monohydroxyl compound in the presence of catalysts, and to the use thereof for preparation of polycarbonates. The alkylene glycol obtained in the preparation of the dialkyl carbonate used is recycled by oxidative carbonylation with carbon monoxide in the presence of a catalyst to give the cyclic alkylene carbonate which is in turn converted to the dialkyl carbonate. More particularly, the process utilizes the alkylene glycol obtained for the diphenyl carbonate preparation process (DPC process).
    Type: Grant
    Filed: October 3, 2011
    Date of Patent: November 6, 2012
    Assignee: Bayer Intellectual Property GmbH
    Inventors: Christoph Gürtler, Thomas Ernst Müller, Pieter Ooms, Friedhelm Risse, Johann Rechner, Franco Doro, Angelina Prokofieva
  • Publication number: 20120157653
    Abstract: The invention relates to polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones.
    Type: Application
    Filed: May 26, 2010
    Publication date: June 21, 2012
    Applicant: BAYER MATERIAL SECIENCE AG
    Inventors: Thomas König, Jörg Kirchhoff, Michael Bierdel, Klemens Kohlgrüber, Johann Rechner, Ing Johan Vaes, Johan Vander Eynde, Frank Bruynseels, Bert Ruytinx
  • Patent number: 8173762
    Abstract: A combined process for the preparation of polycarbonate from bisphenols and diaryl carbonates, the monophenol liberated being reacted again for the preparation of the diaryl carbonate and the alkali metal halide forming in the preparation of the diaryl carbonate being converted by electrochemical oxidation, optionally over a gas diffusion electrode, into chlorine and alkali hydroxide solution, the chlorine being recycled into the preparation of the phosgene and the alkali hydroxide solution being recycled into the preparation of the diaryl carbonate.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: May 8, 2012
    Assignee: Bayer MaterialScience AG
    Inventors: Pieter Ooms, Andreas Bulan, Johann Rechner, Rainer Weber, Marc Buts, Johan Vanden Eynde