Patents by Inventor Uwe Prange
Uwe Prange 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: 6746653Abstract: Transition metals may be recovered from a salt-containing mixture containing at least one transition metal compound, salts, and organic compounds by separating from the salt-containing mixture a mixture of the transition metal compound and the salts. This mixture, together with any organic impurities, is introduced into a combustion zone, and the flue gas/salt mixture leaving the combustion zone is quenched with water. The combustion residue, containing the transition metal, is separated from the resulting quench solution, dried, and converted to fresh catalyst.Type: GrantFiled: February 21, 2001Date of Patent: June 8, 2004Assignee: Degussa AGInventors: Frank Bauer, Uwe Prange, Christoph Theis
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Patent number: 6617469Abstract: A process for preparing malonic diesters by carbonylation of haloacetic esters and reaction with monohydric alcohols and a base in the presence of a transition metal catalyst, preferably a catalytic cobalt carbonyl complex, using a stirred reactor with one or more internal heat exchangers. The stirred reactor preferably contains a sparging stirrer.Type: GrantFiled: December 1, 2000Date of Patent: September 9, 2003Assignee: Degussa AGInventors: Frank Bauer, Wilfried Latz, Uwe Prange, Christoph Theis
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Publication number: 20010018540Abstract: A process for preparing malonic diesters by carbonylation of haloacetic esters and reaction with monohydric alcohols and a base in the presence of a transition metal catalyst, preferably a catalytic cobalt carbonyl complex, using a stirred reactor with one or more internal heat exchangers. The stirred reactor preferably contains a sparging stirrer.Type: ApplicationFiled: December 1, 2000Publication date: August 30, 2001Inventors: Frank Bauer, Wilfried Latz, Uwe Prange, Christoph Theis
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Publication number: 20010017065Abstract: Transition metals may be recovered from a salt-containing mixture containing at least one transition metal compound, salts, and organic compounds by separating from the salt-containing mixture a mixture of the transition metal compound and the salts. This mixture, together with any organic impurities, is introduced into a combustion zone, and the flue gas/salt mixture leaving the combustion zone is quenched with water. The combustion residue, containing the transition metal, is separated from the resulting quench solution, dried, and converted to fresh catalyst.Type: ApplicationFiled: February 21, 2001Publication date: August 30, 2001Applicant: DEGUSSA-HUELS AKTIENGESELLSCHAFTInventors: Frank Bauer, Uwe Prange, Christoph Theis
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Patent number: 4525310Abstract: 3-Alkoxy acrylonitriles are obtained directly from the corresponding nitriles by reaction of carbon monoxide and alcoholates followed by reaction with organic halides.Type: GrantFiled: February 16, 1983Date of Patent: June 25, 1985Assignee: Dynamit Nobel AGInventors: Christoph Theis, Uwe Prange
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Patent number: 4443624Abstract: Production of malonic acid dialkyl esters by reacting halogen acetic acid alkyl ester with carbon monoxide, and alkali metal alcoholate, alkaline earth metal alcoholate or a solution of alkali metal hydroxide in an alcohol at a pH of up to 8.5 in the presence of a cobalt compound which is a catalyst for the reaction.Type: GrantFiled: April 5, 1982Date of Patent: April 17, 1984Assignee: Dynamit Nobel AGInventors: Uwe Prange, Moustafa El Chahawi, Wilhelm Vogt, Hermann Richtzenbain
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Patent number: 4424375Abstract: Improvement in the process of producing carboxylic acid esters or salts involving contacting a halogen alkyl compound with carbon monoxide and a basic substance in the presence of a carbonylation catalyst for carbonylation of the halogen alkyl and production of the corresponding ester or salt of the basic substance. The improvement involves performing the contacting in a reaction vessel, circulating a liquid mass of the halogen alkyl, basic substance and carbonylation catalyst through the vessel and maintaining a carbon monoxide atmosphere in the vessel, injecting the circulating liquid mass into the vessel with a nozzle to spray the liquid mass into the vessel and intimately mixing the liquid mass with carbon monoxide in the nozzle for injection of carbon monoxide into the vessel with the sprayed liquid mass.Type: GrantFiled: June 16, 1981Date of Patent: January 3, 1984Assignee: Dynamit Nobel AGInventors: Moustafa El-Chahawi, Uwe Prange, Hermann Richtzenhain, Wilhelm Vogt
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Patent number: 4399300Abstract: Production of malonic acid dialkyl esters by reacting halogen acetic acid alkyl ester with carbon monoxide, and alkali alcoholate, alkali earth alcoholate or a solution of alkali hydroxide in an alcohol at a pH of up to 8.5 in the presence of a cobalt compound which is a catalyst for the reaction.Type: GrantFiled: May 4, 1981Date of Patent: August 16, 1983Assignee: Dynamit Nobel AktiengesellschaftInventors: Uwe Prange, Moustafa El Chahawi, Wilhelm Vogt, Hermann Richtzenhain
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Patent number: 4319024Abstract: A process for the preparation of a .beta.-alkoxyacrylonitrile of the formulaR'O--CH.dbd.CR--CN (C)where R is hydrogen or an alkyl moiety, among others, by contacting a compound of the formula(1/.alpha.Me) O--CH.dbd.CR--CN (A)where Me is an alkali metal or alkaline earth metal and .alpha. is 1 or 2 respectively, an elevated temperature with a halogen compound of the formulaR'Hal (B)where R' is among others a straight or branched alkyl or alkenyl moiety and Hal represents chlorine, bromine, or iodine. Also disclosed is a process for preparing a 3-amino-acrylonitrile of the formula ##STR1## where R.sup.5 and R.sup.6 represent, among others, hydrogen, alkyl or alkenyl by contacting a 3-alkoxyacrylonitrile or a metal salt of 3-hydroxyacrylonitrile with ammonia and/or amine. Also disclosed is a process for the preparation of such 3-aminoacrylonitrile by contacting a 3-alkoxyacrylonitrile of the formula ##STR2## where R' has the meaning given above and R.sup.Type: GrantFiled: March 24, 1980Date of Patent: March 9, 1982Assignee: Dynamit Nobel AktiengesellschaftInventors: Hermann Peeters, Uwe Prange, Wilhelm Vogt
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Patent number: 4234545Abstract: A process for the recovery of cobalt from residues and/or wastes containing the same by converting the cobalt to cobalt oxide. Disclosed herein is a process for recovering cobalt values from cobalt-containing residues by heating the cobalt in the presence of air to form cobalt oxide which can be separated readily from water-soluble salts which may be present therewith.Type: GrantFiled: October 2, 1978Date of Patent: November 18, 1980Assignee: Dynamit Nobel AktiengesellschaftInventors: Moustafa El-Chahawi, Uwe Prange
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Patent number: 4228097Abstract: A method for the preparation of a compound of the formula ##STR1## or salt thereof bearing one or more .alpha.-hydroxymethylene groups, wherein the univalent moiety R is hydrogen, a straight chain or branched alkyl group of 1 to 20 carbon atoms, a straight chain or branched moiety of the formula--(CH.sub.2).sub.n --COOR.sup.1, OR.sup.1, CF.sub.3,wherein n is from 0 to 5, a straight chain or branched moiety of the formula ##STR2## wherein each R.sup.1 independently represents an alkyl radical of 1 to 12 carbon atoms, or a univalent phenol moiety and n has the meaning above, a substituted or unsubstituted moiety of the formula ##STR3## wherein R.sup.2 is hydrogen, an alkyl group of 1 to 6 carbon atoms, a --(CH.sub.2).sub.n --COOR.sup.1, chlorine, bromine, --OR.sup.1, CF.sub.3, --(CH.sub.2).sub.n --CN, where n and R.sup.1 have the meanings given above, a ring system of the heterocyclic or isocyclic, monocyclic or polycyclic structure which comprises contacting a nitrile of the formulaR--CH.sub.Type: GrantFiled: November 27, 1978Date of Patent: October 14, 1980Assignee: Dynamit Nobel AktiengesellschaftInventors: Moustafa El-Chahawi, Uwe Prange
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Patent number: 4156785Abstract: Process of preparing an .alpha.,.beta.-unsaturated carboxylic acid ester, comprising contacting an .alpha.,.beta.-unsaturated halogen compound with carbon monoxide, an alkali alcoholate in the presence of a metal carbonyl as catalyst, in an alcohol that is the basis of the alkali alcoholate, at a pH of 8.5-11.5. Thereby, for example, crotonic acid methyl ester can be produced from allyl chloride.Type: GrantFiled: July 28, 1975Date of Patent: May 29, 1979Assignee: Dynamit Nobel AktiengesellschaftInventors: Uwe Prange, Hermann Richtzenhain, Wilhelm Vogt
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Patent number: 4141915Abstract: A process for preparing an .alpha.-substituted cyanoacetic acid alkyl ester which comprises contacting an unsaturated nitrile of the formula ##STR1## wherein R.sup.2 is a hydrogen atom or a methyl group andR.sup.3 is CH.sub.2, CHCH.sub.3, CHCN, CHC.sub.6 H.sub.5 or C(CH.sub.3).sub.2 with an alcohol of the formulaROH IIwhereinR is a primary, secondary or tertiary saturated alkyl moiety of 1 to 20 carbon atoms and carbon monoxide in the presence of Co.sub.2 (CO).sub.8 and an .alpha.-substituted pyridine in the absence of hydrogen at an elevated temperature and pressure.Type: GrantFiled: August 30, 1977Date of Patent: February 27, 1979Assignee: Dynamit Nobel AktiengesellschaftInventors: Moustafa El-Chahawi, Uwe Prange, Hermann Richtzenhain, Wilhelm Vogt
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Patent number: 3980697Abstract: Butyric acid esters of the formula: ##EQU1## wherein each R is alkyl, alkyl having an alkoxy substituent, or cycloalkyl, and the R's are the same. The esters are prepared by contacting an allyl halide with carbon monoxide, an alcohol of the formula ROH wherein R is as above, and an alkali alcoholate of the same alcohol, in the presence of a catalyst for the reaction at a pH of 10-14. The esters are useful as solvents for polymers and as plasticizers.Type: GrantFiled: January 24, 1975Date of Patent: September 14, 1976Assignee: Dynamit Nobel AktiengesellschaftInventors: Moustafa El-Chahawi, Uwe Prange, Hermann Richtzenheim, Wilhelm Vogt