Patents by Inventor Hans-Jurgen Arpe

Hans-Jurgen Arpe 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: 4935561
    Abstract: The invention relates to a process for isomerizing monochlorotoluenes or dichlorotoluenes on a zirconium-containing zeolite catalyst of the Pentasil type. Catalysts of this type are distinguished by a particularly high activity coupled with a long service life. In particular, the invention relates to the preparation of a mixture 3-chlorotoluene and 4-chlorotoluene by isomerizing 2-chlorotoluene on zircoium-containing zeolite catalysts of the Pentasil type.The invention also relates to the preparation of a mixture of 2,5-dichlorotoluene and 3,4-dichlorotoluene by appropriate isomerization of 2,4-dichlorotoluene, and to the preparation of a mixture of 2,4-dichlorotoluene and 2,5-dichlorotoluene by appropriate isomerization of 3,4-dichlorotoluene.
    Type: Grant
    Filed: May 31, 1985
    Date of Patent: June 19, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Klaus Eichler, Hans-Jurgen Arpe, Herbert Baltes, Ernst I. Leupold
  • Patent number: 4720583
    Abstract: The invention relates to a process for the isomerization of o-, m- or p-toluidine, or of a mixture of them, on a zirconium-containing zeolite catalyst of the pentasil type. Catalysts of this type are distinguished by particularly high activity and a long useful life. The invention particularly relates to the preparation of m-toluidine by isomerization of o- and/or p-toluidine on zirconium-containing zeolite catalysts of the pentasil type.
    Type: Grant
    Filed: May 31, 1985
    Date of Patent: January 19, 1988
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Klaus Eichler, Ernst I. Leupold, Hans-Jurgen Arpe, Herbert Baltes
  • Patent number: 4650915
    Abstract: The invention relates to a process for preparing p-chlorotoluene and/or m-chlorotoluene by ring-chlorination of toluene by using the following two pages (a) and (b) when further processing the toluene chlorination product composed of mixed isomers:(a) Isolation of p-chlorotoluene from a mixture of o-, m- and p-chlorotoluene by selective adsorption of p-chlorotoluene onto a mesoporous or macroporous zeolite and subsequent desorption of p-chlorotoluene(b) Treatment of an o-chlorotoluene-rich mixture of isomers with an isomerization catalyst.For the exclusive preparation of p-chlorotoluene first p-chlorotoluene is isolated and removed from the toluene chlorination product in stage (a). The remaining mixed isomers are then treated in stage (b) to increase their content of m- and p-isomers and then returned into stage (a).
    Type: Grant
    Filed: August 9, 1985
    Date of Patent: March 17, 1987
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hans-Jurgen Arpe, Heinz Litterer, Norbert Mayer
  • Patent number: 4554380
    Abstract: The invention provides a process for the manufacture of o-toluidine and/or m-toluidine and/or p-toluidine, which comprises the two following steps (a) and (b):(a) treatment of a toluidine isomer mixture or of the not intended toluidine isomer or of one of the not intended toluidine isomers with an isomerization catalyst selected from the group of synthetic zeolites of the pentasil type,(b) isolation of the intended isomer or one of the intended isomers from the isomer mixture formed in step (a) by selective adsorption to a medium-pore or large-pore zeolite and subsequent desorption, furthermore discharge of the isolated isomer and recycling of the remaining isomer mixture to step (a).
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: November 19, 1985
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hans-Jurgen Arpe, Heinz Litterer
  • Patent number: 4501917
    Abstract: The invention relates to a process for reacting RO--CH.sub.2 --OR formaldehyde acetals with carbon monoxide in the liquid phase on an acid organic ion exchange material as catalyst. The main products are ether-esters, RO--CH.sub.2 --COOR, of hydroxyacetic acid (glycolic acid).
    Type: Grant
    Filed: August 5, 1982
    Date of Patent: February 26, 1985
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hans-Joachim Schmidt, Hans-Jurgen Arpe
  • Patent number: 4442228
    Abstract: Ethanol is manufactured by reaction of carbon monoxide with hydrogen on a supported rhodium catalyst containing as cocatalyst at least one of the elements zirconium, hafnium, lanthanum, platinum, chromium and mercury.
    Type: Grant
    Filed: November 19, 1982
    Date of Patent: April 10, 1984
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ernst I. Leupold, Hans-Joachim Schmidt, Friedrich Wunder, Hans-Jurgen Arpe, Horst Hachenberg
  • Patent number: 4324921
    Abstract: Ethers of the hydroxypivalaldehyde RCH.sub.2 OCH.sub.2 C(CH.sub.3).sub.2 CHO are prepared by a catalytic isomerization of 5,5-dimethyl-1,3-dioxans at 250.degree. to 500.degree. C. The catalyst is obtained by way of calcination from silicon dioxide, at least one element of the third main group or subgroup in the form of its oxide or hydroxide and at least one alkali metal oxide or hydroxide.
    Type: Grant
    Filed: May 29, 1980
    Date of Patent: April 13, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Hans-Jurgen Arpe
  • Patent number: 4288558
    Abstract: Acetic acid, ethanol, acetaldehyde and possibly secondary products thereof are prepared by the catalytic reaction of carbon monoxide and hydrogen. The catalyst contains, applied onto a carrier, salts or complex compounds of rhodium with a valence below 3, halide ions and salts or complex compounds of magnesium.
    Type: Grant
    Filed: April 1, 1980
    Date of Patent: September 8, 1981
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hans-Joachim Schmidt, Friedrich Wunder, Hans-Jurgen Arpe, Ernst I. Leupold
  • Patent number: 4247731
    Abstract: Lower alkenes, especially ethylene, are produced from methanol and/or dimethyl ether in the presence of aluminum silicate catalysts containing manganese and possibly further co-catalysts.
    Type: Grant
    Filed: September 17, 1979
    Date of Patent: January 27, 1981
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Friedrich Wunder, Hans-Jurgen Arpe, Horst Hachenberg, Ernst I. Leupold
  • Patent number: 4224236
    Abstract: Acetic acid, ethanol, acetic aldehyde and possibly the secondary products thereof are prepared by the catalytic reaction of carbon monoxide and hydrogen. The catalyst contains applied onto a carrier, metallic rhodium, halide ions and magnesium salts or complex compounds of magnesium or compounds of magnesium with oxides of elements from groups III to VI of the Periodic Table.
    Type: Grant
    Filed: March 29, 1979
    Date of Patent: September 23, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Friedrich Wunder, Hans-Jurgen Arpe, Ernst I. Leupold, Hans-Joachim Schmidt
  • Patent number: 4169959
    Abstract: A process for the preparation of dimethyl glycol by the hydrogenolysis of methylglycol formal in the presence of catalysts which consist of oxide mixtures of silicon and aluminum and/or of rare earths, as well as of metallic nickel and/or cobalt and/or copper, wherein the catalysts contain additionally as promoter metallic palladium and/or rhodium and/or platinum.
    Type: Grant
    Filed: April 13, 1978
    Date of Patent: October 2, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Hans-Jurgen Arpe
  • Patent number: 4128727
    Abstract: Acetic acid ethyl ester is prepared by passing ethylene over a fixed-bed catalyst composed of silicon dioxide, which has a surface from 50 to 200 m.sup.2 /g and which is impregnated with H.sub.2 SO.sub.4, diethylsulfate or ethylsulfuric acid or mixtures of these compounds, with periodically alternating quantities of acetic acid, at a temperature from 130.degree. to 170.degree. C, the acid concentration, calculated on ethylene, varying constantly over a range from 0.01 to 40% by mole.
    Type: Grant
    Filed: December 12, 1977
    Date of Patent: December 5, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ernst I. Leupold, Hans-Jurgen Arpe, Albert Renken, Ernst-Gunther Schlosser
  • Patent number: 4128575
    Abstract: Glycolic acid or the esters thereof are prepared by reacting paraformaldehyde or trioxane or a mixture thereof with formic acid or a formic acid ester in the liquid phase at a temperature of from 70.degree. to 200.degree. C in the presence of a strongly acidic catalyst.
    Type: Grant
    Filed: November 14, 1977
    Date of Patent: December 5, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ernst I. Leupold, Hans-Jurgen Arpe
  • Patent number: 4110372
    Abstract: A process for the removal of formic acid from a crude mixture thereof with carboxylic acids by reacting the formic acid component of the mixture with a carboxylic anhydride and/or a compound forming an anhydride with a carboxylic acid, which comprises carrying out the reaction in the presence of an acidic catalyst.
    Type: Grant
    Filed: August 12, 1975
    Date of Patent: August 29, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hansjorg Hey, Helmut Schaum, Hans-Jurgen Arpe
  • Patent number: 4107263
    Abstract: A process for the preparation of bromine and hydrogen bromide, which comprises reacting ammonium bromide with an oxygen containing gas at temperatures of from 200.degree. to 800.degree. C in the presence of oxidation catalysts is disclosed. Catalysts based on platinum group metals favor formation of HBr. Most other metal catalysts cause chiefly formation of bromine.
    Type: Grant
    Filed: June 15, 1977
    Date of Patent: August 15, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Lothar Schulz, Hans-Jurgen Arpe
  • Patent number: 4105753
    Abstract: A process for the preparation of bromine and hydrogen bromide, which comprises reacting ammonium bromide with an oxygen containing gas at temperatures of from 200.degree. to 800.degree. C. in the presence of oxidation catalysts is disclosed. Catalysts based on platinum group metals favor formation of HBr. Most other metal catalysts cause chiefly formation of bromine.
    Type: Grant
    Filed: January 28, 1975
    Date of Patent: August 8, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Lothar Schulz, Hans-Jurgen Arpe
  • Patent number: 4093666
    Abstract: Ethylene glycol monomethyl ether formals of the formula [CH.sub.3 O(CH.sub.2 CH.sub.2 O).sub.n /.sub.2 CH.sub.2 in which n is in the range of from 1 to 8, are obtained by reacting at least one ethylene glycol monoethyl ether with a 20 to 60% by weight aqueous formaldehyde solution in the presence of an aliphatic chloro- or chloro-fluoro-hydrocarbon having a boiling point of from 35.degree. to 125.degree. C at atmospheric pressure and in the presence of, as a catalyst, a strong acid having a pK value of less than 4, and distilling off the water in the form of an azeotropic mixture.
    Type: Grant
    Filed: November 12, 1976
    Date of Patent: June 6, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Hans-Jurgen Arpe
  • Patent number: 4041039
    Abstract: Process for the manufacture of 2-ethyl-pyridine from 2-methyl-pyridine and methanol in the gaseous phase with a catalyst consisting essentially of silicon dioxide and oxides of metals of the second and/or third main group or subgroup and/or the fifth main group of the periodic system of elements at elevated temperatures.
    Type: Grant
    Filed: February 17, 1976
    Date of Patent: August 9, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hans-Jurgen Arpe, Hansjorg Hey
  • Patent number: 4009209
    Abstract: A process is provided for the dimerization of cyclohexylidene-acetonitrile to form 2-(1-cyclohexenyl)-3,3-pentamethylene-glutaric acid dinitrile and the hydrogenation thereof to form 1,5-diamino-2-(1-cyclohexenyl)-3,3-pentamethylene-pentane.
    Type: Grant
    Filed: February 9, 1976
    Date of Patent: February 22, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ernst Ingo Leupold, Hans-Jurgen Arpe
  • Patent number: 3972949
    Abstract: Glycol dimethyl ethers of the formula CH.sub.3 O(CH.sub.2 CH.sub.2 O).sub.n CH.sub.3, wherein n is an integer of from 1 to 8 are prepared by reacting the corresponding glycol monomethyl ether formal with hydrogen under a pressure of 30 to 300 bars and at a temperature of 50.degree. to 250.degree.C in the presence of catalysts comprising silicon dioxide and aluminium oxide or oxides of rare earths or mixtures thereof and containing additionally nickel, cobalt and copper.
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: August 3, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Hans-Jurgen Arpe