Patents by Inventor Dieter Schlafer
Dieter Schlafer 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).
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Patent number: 7517435Abstract: Mercury is removed from solutions contaminated with mercury, the solution contaminated with mercury being introduced into a distillation column above the column bottom, solvent being distilled off and solution depleted in mercury being stripped off at the column bottom.Type: GrantFiled: November 17, 2003Date of Patent: April 14, 2009Assignee: BASF SEInventors: Josef Guth, Holger Friedrich, Hans-Jürgen Bender, Dieter Schlafer
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Patent number: 7445664Abstract: The invention relates to a desublimator for producing particulate, solid aluminum chloride from aluminum chloride vapor, which is formed by a vessel which is closed on all sides and has vertical walls and a feed point for the aluminum chloride vapor and an offtake point for the solid aluminum chloride, wherein the walls of the vessel are formed by flat metal sheets which are welded into a rigid frame so that they can be set into vibration by being struck with a tapper.Type: GrantFiled: September 13, 2005Date of Patent: November 4, 2008Assignee: BASF AktiengesellschaftInventors: Dieter Schläfer, Hans-Ulrich Schlimper
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Publication number: 20060076228Abstract: Mercury is removed from solutions contaminated with mercury, the solution contaminated with mercury being introduced into a distillation column above the column bottom, solvent being distilled off and solution depleted in mercury being stripped off at the column bottom.Type: ApplicationFiled: November 17, 2003Publication date: April 13, 2006Applicant: BASF AktiengesellschaftInventors: Josef Guth, Holger Friedrich, Hans-Jurgen Bender, Dieter Schlafer
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Publication number: 20060070522Abstract: The invention relates to a desublimator for producing particulate, solid aluminum chloride from aluminum chloride vapor, which is formed by a vessel which is closed on all sides and has vertical walls and a feed point for the aluminum chloride vapor and an offtake point for the solid aluminum chloride, wherein the walls of the vessel are formed by flat metal sheets which are welded into a rigid frame so that they can be set into vibration by being struck with a tapper.Type: ApplicationFiled: September 13, 2005Publication date: April 6, 2006Applicant: BASF AKTIENGESELLSCHAFTInventors: Dieter Schlafer, Hans-Ulrich Schlimper
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Publication number: 20050101806Abstract: Alkali metal alkoxides are prepared by reacting alkali metal amalgam with alcohol in the presence of a catalyst comprising porous iron.Type: ApplicationFiled: November 8, 2004Publication date: May 12, 2005Inventors: Kerstin Schierle-Arndt, Andreas Ansmann, Hans-Josef Sterzel, Dieter Schlafer, Josef Guth, Holger Friedrich
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Patent number: 6890508Abstract: The present invention relates to a process for preparing largely HBr-free HCl gas and largely HBr-free aqueous HCl solution, which comprises the following steps: a) providing HBr-containing HCl gas; b) passing the HBr-containing HCl gas through aqueous HCl solution saturated with HCl; c) separating off HBr-containing aqueous HCl solution saturated with HCl; d) if desired, passing the largely HBr-free HCl gas obtained in step b) into water to obtain largely HBr-free aqueous HCl solution; with largely HBr-free aqueous HCl solution produced in step d) being able, if desired, to be recirculated to step b) of the process. The process of the present invention allows high-purity aqueous HCl solution for use in the semiconductor industry to be prepared inexpensively and on an industrial scale. However, the purified HCl gas obtained by means of steps a) to c) can also be used for any other purposes. The invention likewise provides an apparatus for carrying out the process of the present invention.Type: GrantFiled: December 4, 2002Date of Patent: May 10, 2005Assignee: BASF AktiengesellschaftInventors: Dieter Schläfer, Josef Guth, Hans-Ulrich Schlimper
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Patent number: 6770187Abstract: The invention relates to an electrolysis cell comprising an anode compartment which comprises an aqueous solution of at least one alkali metal salt, a cathode compartment and a solid electrolyte which separates the anode compartment and the cathode compartment from one another, wherein that part of the surface of the solid electrolyte which is in contact with the anode compartment and/or that part of the surface of the solid electrolyte which is in contact with the cathode compartment has/have at least one further ion-conducting layer.Type: GrantFiled: February 25, 2002Date of Patent: August 3, 2004Assignee: BASF AktiengesellschaftInventors: Hermann Pütter, Günther Huber, Kerstin Schierle-Arndt, Dieter Schläfer, Josef Guth
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Patent number: 6657091Abstract: Alkali metal alkoxides are prepared by reacting alkali metal amalgam with alcohol in the presence of a catalyst comprising iron having a carbon content of at least 0.3% by weight.Type: GrantFiled: September 28, 2001Date of Patent: December 2, 2003Assignee: BASF AktiengesellschaftInventors: Kerstin Schierle-Arndt, Hans-Josef Sterzel, Dieter Schläfer, Josef Guth, Holger Friedrich, Peter Zehner
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Publication number: 20030108468Abstract: The present invention relates to a process for preparing largely HBr-free HCl gas and largely HBr-free aqueous HCl solution, which comprises the following steps:Type: ApplicationFiled: December 4, 2002Publication date: June 12, 2003Inventors: Dieter Schlafer, Josef Guth, Hans-Ulrich Schlimper
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Patent number: 6409908Abstract: In a process for producing an alkali metal from alkali metal amalgam by electrolysis using an alkali metal amalgam as anode, a solid electrolyte which conducts alkali metal ions and a liquid alkali metal as cathode, the alkali metal amalgam as anode is kept in motion.Type: GrantFiled: December 13, 1999Date of Patent: June 25, 2002Assignee: BASF AktiengesellschaftInventors: Günther Huber, Hermann Pütter, Kerstin Schierle-Arndt, Dieter Schläfer, Josef Guth, Bernd Schube, Diethard Lenz
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Patent number: 6402910Abstract: A process for preparing sodium and aluminum chloride electrochemically is described in which, in an electrolytic cell containing aluminum as an anode and sodium as a cathode which are separated from one another by a sodium ion-conducting solid electrolyte, a fused electrolyte essentially containing sodium tetrachloroaluminate is electrolyzed in the anode compartment, aluminum chloride formed in this process is evaporated from the electrolytic cell and sodium is removed from the cathode compartment.Type: GrantFiled: May 9, 2000Date of Patent: June 11, 2002Assignee: BASF AktiengesellschaftInventors: Hermann Pütter, Günther Huber, Luise Spiske, Hans Stark, Dieter Schläfer, Gerhard Pforr
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Publication number: 20020062050Abstract: Alkali metal alkoxides are prepared by reacting alkali metal amalgam with alcohol in the presence of a catalyst comprising iron having a carbon content of at least 0.3% by weight.Type: ApplicationFiled: September 28, 2001Publication date: May 23, 2002Inventors: Kerstin Schierle-Arndt, Hans-Josef Sterzel, Dieter Schlafer, Josef Guth, Holger Friedrich, Peter Zehner
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Patent number: 6368487Abstract: An electrolytic cell comprises an agitated, alkali metal amalgam-containing anode, an alkali metal ion-conducting solid electrolyte and a cathode, wherein the solid electrolyte and the cathode are separated from one another by a liquid electrolyte.Type: GrantFiled: June 8, 2000Date of Patent: April 9, 2002Assignee: BASF AktiengesellschaftInventors: Günther Huber, Hermann Pütter, Kerstin Schierle-Arndt, Dieter Schläfer, Josef Guth
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Patent number: 6352660Abstract: Composite fibers useful for preparing diaphragms are prepared by (a) mixing a PTFE or PTFE copolymer dispersion or powder with a finely divided inorganic material and a fiber forming material, (b) shear heating the resulting mixture to a temperature at which sheared to PTFE or PTFE copolymer becomes flowable without showing signs of decomposition while removing the dispersion medium, if a PTFE or PTFE copolymer dispersion is used, (c) cooling the mixture to below 70° C., (d) mix shearing the mixture at below 70° C. to form composite fibers.Type: GrantFiled: October 21, 1998Date of Patent: March 5, 2002Assignee: BASF AktiengesellschaftInventors: Holger Friedrich, Ulrich Bröckel, Dieter Schläfer, Klaus-Dieter Hoppe, Kurt Hecky, Peter Palm
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Patent number: 6287448Abstract: A process for producing metallic lithium starting from an aqueous solution of at least one lithium salt comprises the following steps: (I) Production of a lithium amalgam from an aqueous solution of at least one lithium salt; and (II) Electrolysis using an anode comprising the lithium amalgam, a solid electrolyte which conducts lithium ions, and liquid lithium as cathode, wherein the lithium amalgam as anode is kept in motion.Type: GrantFiled: March 20, 2000Date of Patent: September 11, 2001Assignee: BASF AktiengesellschaftInventors: Kerstin Schierle-Arndt, Hermann Pütter, Günther Huber, Dieter Schläfer, Josef Guth
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Patent number: 6235183Abstract: A process for preparing sodium and aluminum chloride electrochemically is described in which, in an electrolytic cell containing aluminum as an anode and sodium as a cathode which are separated from one another by a sodium ion-conducting solid electrolyte, a fused electrolyte essentially containing sodium tetrachloroaluminate is electrolyzed in the anode compartment, aluminum chloride formed in this process is evaporated from the electrolytic cell and sodium is removed from the cathode compartment.Type: GrantFiled: January 27, 1998Date of Patent: May 22, 2001Assignee: Basf AktiengesellschaftInventors: Hermann Pütter, Günther Huber, Luise Spiske, Hans Stark, Dieter Schläfer, Gerhard Pforr
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Patent number: 6113657Abstract: In a process for preparing crystalline NaOH.3.5H.sub.2 O, NaOH.3.5H.sub.2 O is allowed to crystallize from an aqueous sodium hydroxide solution which contains sodium chloride and is saturated in respect of NaOH.3.5H.sub.2 O and the crystals formed are separated from the solution using a mechanical solid/liquid separation apparatus, wherein the solid/liquid separation is carried out under conditions under which the crystalline NaOH.3.5H.sub.2 O is freed sufficiently of residual solution adhering to the surface for the sodium chloride content of the crystalline NaOH.3.5H.sub.2 O obtained to be less than 100 mg per kg. The crystalline NaOH.3.5H.sub.2 O is subjected to an additional purification step, which may include the at least superficial melting or the at least superficial dissolution of the crystals, in combination with a solid/liquid separation step. The additional purification step. The additional purification step comprises washing the crystalline NaOH.3.5H.sub.2 O separated off.Type: GrantFiled: March 13, 1998Date of Patent: September 5, 2000Assignee: BASF AktiengesellschaftInventors: Dieter Schlafer, Michael Mauss, Matthias Rauls, Dieter Baumann
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Patent number: 5919348Abstract: The flow resistance of a diaphragm based on a fiber material is modified by treating the diaphragm during or after preparation thereof with a dispersion comprising a fluorine-containing component and optionally with a solution comprising a precursor of ZrO.sub.2.Type: GrantFiled: December 2, 1997Date of Patent: July 6, 1999Assignee: BASF AktiengesellschaftInventors: Holger Friedrich, Klaus-Dieter Hoppe, Bernd Leutner, Dieter Schlafer, Kurt Hecky
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Patent number: 5899393Abstract: The invention relates to a process for recycling diaphragms, in particular a process for recycling used asbestos-free diaphragms from alkali metal chloride electrolysis, the diaphragm material being comminuted, the diaphragm material being washed with a wash substrate and a reusable material being obtained.Type: GrantFiled: January 11, 1996Date of Patent: May 4, 1999Assignee: BASF AktiengesellschaftInventors: Rudi Kroner, Bernd Leutner, Dieter Schlafer, Wolfgang Steiner, Holger Friedrich
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Patent number: 5876785Abstract: The invention relates to a process for recycling diaphragms, in particular a process for recycling used asbestos-free diaphragms from alkali metal chloride electrolysis, the diaphragm material being comminuted, the diaphragm material being washed with a wash substrate and a reusable material being obtained.Type: GrantFiled: December 17, 1997Date of Patent: March 2, 1999Assignee: BASF AktiengesellschaftInventors: Rudi Kroner, Bernd Leutner, Dieter Schlafer, Wolfgang Steiner, Holger Friedrich