Preparing By Dehydrogenation Patents (Class 568/740)
  • Patent number: 5420362
    Abstract: 4-Halo-1-naphthol is reacted with a secondary amine and formaldehyde to produce a reaction mixture containing a Mannich base which is hydrogenated to produce 2-methyl-1-naphthol. Advantageously, the procedure can be carried out in one pot.
    Type: Grant
    Filed: October 8, 1993
    Date of Patent: May 30, 1995
    Assignee: Clairol, Inc.
    Inventors: Mu-Ill Lim, Linas Stasaitis, Yuo-Guo Pan, Alexander Chan
  • Patent number: 4978789
    Abstract: A process for producing an alkenyl substituted aromatic compound having the general formula (I): ##STR1## wherein Ar represents an aromatic ring, R.sup.1 represents an alkenyl group having 2 to 8 carbon atoms, p is 1, 2, or 3 provided that R.sup.1 may be the same or different when p is 2 or 3, R.sup.2 represents an alkyl group having 1 to 8 carbon atoms, q is 0, 1, or 2 provided that R.sup.2 may be the same or different when q is 2, X represents --OH or --NR.sup.3 R.sup.4 wherein R.sup.3 and R.sup.4 independently represent hydrogen or an alkyl group having 1 to 2 carbon atoms, n is 1 or 2, provided that the sum of p and q is 1, 2, or 3 comprising the step of catalytically dehydrogenating an alkyl substituted aromatic compound having the general formula (III): ##STR2## wherein R.sup.5 represents an alkyl group having 2 to 8 carbon atoms and Ar, R.sup.2, X, p, q, and n are the same as defined above, n is 1 or 2, provided that R.sup.
    Type: Grant
    Filed: July 10, 1989
    Date of Patent: December 18, 1990
    Inventors: Katsuo Taniguchi, Shigeki Fujikawa, Yoshito Kurano
  • Patent number: 4538009
    Abstract: Substituted phenols of the general formula I ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are each hydrogen or an aliphatic or aromatic hydrocarbon radical, are prepared by dehydrogenating a cyclic alcohol of the general formula II ##STR2## or a cyclic ketone of the general formula III ##STR3## where one of the broken lines can be an additional C-C bond, in the gas phase at from to C. over a supported noble metal catalyst, by a process in which the dehydrogenation catalyst used is palladium or platinum on an aluminum spinel carrier, in particular an aluminum spinel which has a BET specific surface area of from 5 to 150 m.sup.2 /g or, for the dehydrogenation of cyclohexenones, preferably from 10 to 50 m.sup.2 /g. Particularly suitable aluminum spinels are those which, in addition to aluminum, contain magnesium, zinc, cobalt or nickel.
    Type: Grant
    Filed: April 12, 1984
    Date of Patent: August 27, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Norbert Goetz, Harald Laas, Peter Tavs, Leopold Hupfer, Karl Baer
  • Patent number: 4503271
    Abstract: A process for the production of p-vinyl phenol by the dehydrogenation of p-ethyl phenol in a gaseous phase in the presence of a catalyst and a diluent wherein the dehydrogenation of p-ethyl phenol is effected with phenol and/or p-cresol being present in the reaction system in an amount of 5 to 50 wt % of the amount of p-ethyl phenol.
    Type: Grant
    Filed: September 2, 1983
    Date of Patent: March 5, 1985
    Assignee: Maruzen Oil Co., Ltd.
    Inventors: Hiroshi Fujiwara, Hatsutaro Yamazaki, Kazuo Ozawa
  • Patent number: 4319054
    Abstract: There is disclosed a process for producing pyrogallol by dehydrogenation of cyclohexane-1,2,3-triol in the presence of a platinum group metal catalyst in an inert gas stream. The catalyst contains, as modifier, (a) at least one alkali metal salt and/or (b) at least one member selected from the group consisting of gold, tellurium, silver, arsenic, selenium, indium, antimony, bismuth, copper and zinc, with the Pd-Te catalyst being preferred. The catalyst ingredients are supported on a carrier. The process gives high selectivity of pyrogallol.
    Type: Grant
    Filed: December 8, 1980
    Date of Patent: March 9, 1982
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Takao Maki, Kenji Murayama
  • Patent number: 4272364
    Abstract: Use of 4,4-dimethyl-1-pentanol as a froth flotation agent for coal recovery processes.
    Type: Grant
    Filed: March 24, 1980
    Date of Patent: June 9, 1981
    Assignee: Calgon Corporation
    Inventors: Kenneth W. Dixon, Frederick A. Hoffstadt
  • Patent number: 4254288
    Abstract: A method of producing an aromatic compound comprises dehydrogenating a compound having a six-membered carbocyclic ring in the molecule, the ring having a degree of saturation greater than that of a benzene ring, the dehydrogenation being carried out in the presence of a catalyst system comprising elemental palladium together with sodium carbonate and sulphur. The compound to be dehydrogenated may be a substituted cyclohexane. When the substituted cyclohexane is an alkoxycyclohexanol, the aromatic compound produced is an alkoxy phenol. In particularly useful aspect of the invention the substituted cyclohexane is a 2-alkoxycyclohexanol, the aromatic compound produced being an ortho-alkoxy phenol.
    Type: Grant
    Filed: July 6, 1979
    Date of Patent: March 3, 1981
    Assignee: Coalite Group Limited
    Inventor: Keith Gladwin
  • Patent number: 4161615
    Abstract: Preparation of 2-hydroxynaphthalenes optionally substituted by aliphatic or aromatic radicals from cycloalkenones or hydroxycycloalkanones by heating them in the presence of a dehydrogenation agent.
    Type: Grant
    Filed: May 26, 1977
    Date of Patent: July 17, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Werner H. Muller
  • Patent number: 4160113
    Abstract: The present invention is related to a process for the manufacture of resorcinols by catalytic dehydrogenation of cyclohexane diones-(1,3) in the liquid phase by means of a dehydrogenating mixture consisting of a solvent and of a catalyst containing a noble metal from Group VIII of the Periodic Table.
    Type: Grant
    Filed: November 11, 1977
    Date of Patent: July 3, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Werner H. Muller, Knut Riedel, Hans Krekeler