Patents by Inventor Heinz Hannebaum
Heinz Hannebaum 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: 6362347Abstract: Phthalides in as-obtained phthalide synthesis reaction mixtures are recovered in pure form by (a) distilling compounds having a boiling point below the boiling point of the phthalide from the reaction mixture, provided such compounds are present in the reaction mixture, to obtain a crude phthalide as bottom product, (b) crystallizing the phthalide from a melt of the crude phthalide.Type: GrantFiled: March 14, 2000Date of Patent: March 26, 2002Assignee: BASF AktiengesellschaftInventors: Dieter Baumann, Hermann Pütter, Heinz Hannebaum
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Patent number: 6315884Abstract: A process for preparing phthalides by I. reducing phthalic acid or phthalic acid derivatives, where the carboxyl groups may be replaced by units which can be derived from the carboxyl groups by a condensation reaction and where one or more of the hydrogens of the o-phenylene unit may be substituted by inert radicals, at a cathode in a undivided electrolytic cell and dissolved in an electrolyte, II. discharging the electrolyte from the electrolytic cell when the reaction has proceeded to the stage where the molar ratio (M), formed by the proportion of phthalide and the sum of the proportions of phthalide and phthalic acid of phthalic acid derivatives in the electrolyte, is from 0.8:1 to 0.995:1, and III. crystallizing the phthalides from the electrolyte and removing them from the mother liquor, if appropriate after distillative work-up of the electrolyte is described.Type: GrantFiled: March 20, 2000Date of Patent: November 13, 2001Assignee: BASF AktiengesellschaftInventors: Hermann Pütter, Dieter Baumann, Heinz Hannebaum
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Patent number: 6245945Abstract: A process for the selective hydrolysis of acetals in the presence of phthalides comprises reacting a mixture (M) comprising a) a phthalide of the formula (I) where: R1,R2,R3 and R4: are independently hydrogen, C1-C4-alkyl or halogen, and b) an acetal or ketal of the formula (II) where: R5 and R6: are independently C1-C6-alkyl, C6-C10-aryl or together ethylene, and R7 and R8: are independently C1-C6-alkyl, or one radical is a hydrogen and the other is a phenyl radical where from 1 to 3 hydrogen atoms of the phenyl radical may be replaced by C1-C6-alkyl radicals or C1-C4-alkoxy radicals, or R7 and R8 are together C3-C6-alkanediyl, and a hydrogen atom may be replaced by a hydroxyl group, at from 10 to 200° C. in the presence of from 1 to 10 mol of water, based on the amount of acetal or ketal of the formula (II), to hydrolyze the acetal or ketal of the formula (II) to the corresponding aldehyde or ketone.Type: GrantFiled: August 25, 2000Date of Patent: June 12, 2001Assignee: BASF AktiengesellschaftInventors: Andreas Weiper-Idelmann, Heinz Hannebaum, Hermann Pütter
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Patent number: 6077414Abstract: A stacked plate cell having serially connected stacked electrodes is described, at least one stacked electrode consisting of a graphite felt plate, a carbon felt plate, a web having a carbon-covered starting material contact surface or a porous solid having a carbon-covered starting material contact surface or comprising such a material.Type: GrantFiled: May 11, 1998Date of Patent: June 20, 2000Assignee: BASF AktiengesellschaftInventors: Hermann Putter, Heinz Hannebaum
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Patent number: 6063256Abstract: A process is disclosed for preparing phthalides by cathodic reduction of phthalic acid or phthalic acid derivatives, in which the carboxylic acid units may be substituted by units which can be derived by a condensation reaction from carboxylic acid units and in which one or several hydrogen atoms of the o-phenylene unit of the phthalic acid may be substituted by inert radicals. This process is characterised in that the reduction is carried out in an organic solvent which contains less than 50 wt % water and in a non-divided electrolytic cell.Type: GrantFiled: August 10, 1998Date of Patent: May 16, 2000Assignee: BASF AktiengesellschaftInventors: Hermann Putter, Heinz Hannebaum
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Patent number: 5507922Abstract: Benzaldehyde dialkyl acetals of the general formula I ##STR1## where R.sup.1 is C.sub.1 -C.sub.6 -alkyl, R.sup.2 is C.sub.1 -C.sub.6 -alkyl, C.sub.1 -C.sub.6 -alkoxy, halogen, cyano or carboxyalkyl where the alkyl group is of 1 to 6 carbon atoms, n is an integer of from 1 to 3 and the radicals R.sup.2 may be identical or different when n is >1, are prepared by electrochemical oxidation of a substituted toluene compound of the general formula II ##STR2## by a process in which a substituted toluene compound II is oxidized in the presence of an alkanol R.sup.Type: GrantFiled: August 11, 1994Date of Patent: April 16, 1996Assignee: BASF AktiengesellschaftInventors: Dieter Hermeling, Heinz Hannebaum, Hartwig Voss, Andreas Weiper-Idelmann
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Patent number: 4990227Abstract: Hydroxycarboxylic esters of the general formula ##STR1## where n is an integer from 0 to 10, R.sup.1 and R.sup.2 are each hydrogen, hydroxyl, alkoxy or an aliphatic or olefinic, straight-chain, branched or cyclic hydrocarbon radical, and R.sup.1 and R.sup.2 together may furthermore form an alkylene radical, and the hydrocarbon radicals may furthermore be substituted by halogen, hydroxyl, epoxy or nitrile, and R.sup.3 is a low molecular weight alkyl radical, are prepared by electrochemical oxidation of a hydroxyaldehyde of the general formula ##STR2## in the presence of an alcohol of the formula R.sup.3 OH and of an ionic bromide or chloride in an undivided electrolysis cell.Type: GrantFiled: March 31, 1989Date of Patent: February 5, 1991Assignee: BASF AktiengesellschaftInventors: Michael Steiniger, Heinz Hannebaum
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Patent number: 4814510Abstract: Benzaldehyde derivatives of the general formula I, where X is an oxygen atom or two R.sup.2 O groups and R.sup.1 and R.sup.2 are alkyl radicals of 1-4 carbon atoms, their preparation, and their use as odorants or odorant intermediates.Type: GrantFiled: December 14, 1987Date of Patent: March 21, 1989Assignee: BASF AktiengesellschaftInventors: Dieter Degner, Walter Gramlich, Heinz Hannebaum
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Patent number: 4759832Abstract: Biscarbamates, including novel one, of the general formula ##STR1## where R is alkyl of 1 to 8 carbon atoms and X is a hydrocarbon radical of 2 to 60 carbon atoms in which one or more carbon atoms may be replaced by hetero atoms and which may contain halogen atoms or ester, carbonyl or nitrile groups are prepared by electrochemically oxidizing formamides of the general formula ##STR2## in the presence of an alkanol of the formula ROH and of an ionic halide.Type: GrantFiled: February 13, 1987Date of Patent: July 26, 1988Assignee: BASF AktiengesellschaftInventors: Dieter Degner, Heinz Hannebaum
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Patent number: 4661217Abstract: Carbamic acid esters (I)R.sup.1 NHCOOR.sup.2 (I)wherein R.sup.1 is H, alkyl, cycloalkyl or alkylaryl and R.sup.2 is alkyl, are prepared by electro-oxidation of a formamide (II)R.sup.1 NHCHO (II)in the presence of an alcohol R.sup.2 OH and of an ionic halide.Type: GrantFiled: August 11, 1986Date of Patent: April 28, 1987Assignee: BASF AktiengesellschaftInventors: Dieter Degner, Heinz Hannebaum, Michael Steiniger
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Patent number: 4562277Abstract: Improved process for the preparation of salcomine useful as an oxidation catalyst for the oxidation of alkylated phenols to the corresponding alkylated p-benzoquinones by reacting salicylaldehyde with ethylenediamine in a mole ratio of about 2:1 and a cobalt salt in a liquid reaction medium wherein the reaction medium is a linear or cyclic carboxamide which is disubstituted on the nitrogen, in particular dimethylformamide, and the cobalt salt is cobalt carbonate or with the cobalt hyroxide carbonate, 2 CoCO.sub.3.3 Co(OH).sub.2.H.sub.2 O. Preparation of the salcomine in accordance with the invention offers significant advantages, both in the preparation of the salcomine itself and in the subsequent oxidation of the trimethylphenol to trimethyl-p-benzoquinone utilizing the salcomine.Type: GrantFiled: January 18, 1984Date of Patent: December 31, 1985Assignee: BASF AktiengesellschaftInventors: Harald Laas, Peter Tavs, Heinz Hannebaum, Manfred Stroezel
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Patent number: 4539081Abstract: Benzaldehyde dialkyl acetals of the formula ##STR1## wherein R.sup.1 and R.sup.2 are each alkyl, are prepared by electrochemical oxidation of an alkyltoluene of the formula ##STR2## by a process in which the electrolyte used contains from 60 to 90% by weight of an alkanol of the formula R.sup.2 OH, from 8.5 to 40% by weight of the alkyltoluene and from 0.01 to 1.5% by weight of an HO.sub.3 S-containing acid.Type: GrantFiled: June 21, 1984Date of Patent: September 3, 1985Assignee: BASF AktiengesellschaftInventors: Dieter Degner, Heinz Hannebaum, Hardo Siegel, Walter Gramlich
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Patent number: 4441970Abstract: 2,5-Dialkoxy-2,5-dihydrofurans are prepared by a process in which 2,5-dihydrofuran is oxidized electrochemically in the presence of an alkanol.Type: GrantFiled: October 18, 1982Date of Patent: April 10, 1984Assignee: BASF AktiengesellschaftInventors: Dieter Degner, Heinz Hannebaum
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Patent number: 4411746Abstract: A process for the preparation of alkyl-substituted benzaldehydes by electrooxidation of alkylbenzenes using graphite anodes coated with metal oxides or with carbides.Type: GrantFiled: July 22, 1982Date of Patent: October 25, 1983Assignee: BASF AktiengesellschaftInventors: Dieter Degner, Hans Roos, Heinz Hannebaum
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Patent number: 4298438Abstract: A process for the preparation of 4-tert.-butylbenzaldehyde by electrochemical oxidation of 4-tert.-butyltoluene in the presence of an inorganic acid and of an alkylsulfonic, alkenylsulfonic or arylsulfonic acid.Type: GrantFiled: November 3, 1980Date of Patent: November 3, 1981Assignee: BASF AktiengesellschaftInventors: Dieter Degner, Hardo Siegel, Heinz Hannebaum
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Patent number: 4086250Abstract: Bicyclo[2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic acid dianhydride is manufactured by reacting 3,5-cyclohexadiene-1,2-trans-dicarboxylic acid with maleic acid in the presence of anhydrides of low molecular weight alkanecarboxylic acids at from 50.degree. to 150.degree. C. The 3,5-cyclohexadiene-1,2-trans-dicarboxylic acid, in the anhydride of the low molecular weight alkanecarboxylic acid, and in the presence of water-soluble salts of the alkali metals, of the alkaline earth metals or of zinc, manganese or iron, in which salts the anion contains oxygen, is first heated to the reaction temperature and the maleic anhydride is then added.Type: GrantFiled: November 19, 1976Date of Patent: April 25, 1978Assignee: BASF AktiengesellschaftInventors: Heinz Nohe, Heinz Hannebaum
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Patent number: 4048047Abstract: An electrochemical cell with a nonpartitioned electrolyte chamber and plane electrodes, which form a stack, the chamber filled by the electrolyte forming narrow gaps between the electrodes, and the electrode stack being assembled on a fixed baseplate so that its axis is essentially vertical.Type: GrantFiled: January 14, 1976Date of Patent: September 13, 1977Assignee: BASF AktiengesellschaftInventors: Fritz Beck, Diethard Francke, Heinz Nohe, Heinz Hannebaum, Manfred Stroezel