Patents by Inventor Dieter Schläfer
Dieter Schläfer 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: 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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
Patent number: 4837002Abstract: Chlorate is removed from aqueous caustic soda by reducing with iron pentacarbonyl and separating off the resulting iron oxide containing precipitate.Type: GrantFiled: February 22, 1988Date of Patent: June 6, 1989Assignee: BASF AktiengesellschaftInventors: Dieter Schlaefer, Wolfgang Kochanek, Bernd Leutner
-
Patent number: 4557818Abstract: A gas-evolving metal electrode consists of profiles which are arranged parallel to one another in a horizontal plane and are connected to one another by means of current distributors. The profile surfaces which face the counter-electrode are curved, the curvature at the sides being more pronounced than that in the middle. The profile is terminated above by means of two lateral surfaces tangential to the curvature. The electrode is useful as an anode for mercury cells for the chloralkali electrolysis.Type: GrantFiled: July 12, 1984Date of Patent: December 10, 1985Assignee: BASF AktiengesellschaftInventors: Hans Roos, Dieter Schlaefer, Hugo Boehn, Knut Bittler, Heinz Kilthau
-
Patent number: 4422921Abstract: Bipolar electrodes with graphite as the carrier have a layer of chromium trioxide not less than 10 .mu.m thick on both the anode face and the cathode face.The electrodes are produced by plasma-spraying chromium trioxide powder onto a graphite layer, and can be used as bipolar electrodes in alkali metal chloride electrolysis cells.Type: GrantFiled: August 16, 1982Date of Patent: December 27, 1983Assignee: BASF AktiengesellschaftInventors: Hans Roos, Hugo Boehn, Knut Bittler, Dieter Schlaefer