Patents by Inventor Moustafa El-Chahawi
Moustafa El-Chahawi 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: 5527969Abstract: A process for preparing acetaldehyde diethyl acetal is provided which involves:reacting acetaldehyde with ethanol in the presence of an acid catalyst and in the presence of an entrainer having a boiling point of from 25.degree. to 75.degree. C.Type: GrantFiled: February 7, 1995Date of Patent: June 18, 1996Assignee: Huels AktiengesellschaftInventors: Manfred Kaufhold, Moustafa El-Chahawi
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Patent number: 4772711Abstract: Disclosed is a method for the preparation of 3-aminoacrylic acid esters by the addition of a beta-hydroxyacrylic acid esters to an aqueous solution of an amine salt.Type: GrantFiled: August 19, 1986Date of Patent: September 20, 1988Assignee: Dynamit Nobel AGInventors: Fritz Englaender, Moustafa El-chahawi, Wilhelm Vogt
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Patent number: 4699999Abstract: From reaction solutions of carboxylic acids prepared by carbonylation with the aid of cobalt carbonyl catalysts, the cobalt of the catalyst is precipitated by the addition of at least equivalent amounts of monocarboxylic or dicarboxylic acids and neutralization with alkaline agents, in the form of a cobalt(II) salt of the added acid, and the carboxylic acid is completely recovered from the reaction solution by acidification.Type: GrantFiled: August 8, 1986Date of Patent: October 13, 1987Assignee: Dynamit Nobel AGInventors: Moustafa El-Chahawi, Gunter Meyer
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Patent number: 4515984Abstract: A process is described for the preparation of an alkali metal formyl acetic acid alkyl ester by reaction of acetic acid alkyl ester, an alkali-metal alcoholate and carbon monoxide at elevated pressure and elevated temperature, the improvement wherein an excess of acetic acid alkyl ester referred to the alkali-metal alcoholate is employed and the reaction is carried out in the absence of a solvent.Type: GrantFiled: September 20, 1982Date of Patent: May 7, 1985Assignee: Dynamit Nobel AktiengesellschaftInventor: Moustafa El-Chahawi
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Patent number: 4447644Abstract: A method for the preparation of optionally substituted arylpyruvic acids by reaction of optionally substituted arylmethylhalides with carbon monoxide in the presence of a metal carbonyl compound and a base is disclosed wherein the base is an alkali metal hydroxide, the process is carried out at a temperature of -10.degree. to +70.degree. C. in the presence of an alcohol or cyclic ether.Type: GrantFiled: May 24, 1982Date of Patent: May 8, 1984Assignee: Dynamit Nobel AGInventor: Moustafa El-Chahawi
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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: 4376866Abstract: New process for making esters of .alpha.-hydroxymethylene arylacetic acid from the corresponding arylacetic acid ester by conversion with an alkali alcoholate and carbon monoxide. The resulting hydroxy methylene compound can be obtained from the resulting alkali salt by release with an acid.Type: GrantFiled: January 27, 1982Date of Patent: March 15, 1983Assignee: Dynamit Nobel AGInventors: Fritz Englaender, Moustafa El-Chahawi, 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: 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: 4060690Abstract: In a process of producing an alkyl ester of a substituted or unsubstituted arylacetic acid wherein a substituted or unsubstituted aromatic halogen methyl compound is reacted with carbon monoxide and an alcohol having an alkoxy group the same as that of said ester, the improvement which comprises carrying out said reaction in a basic reaction medium in the presence as catalyst ofA. cobalt salt, metal or metal alloy and a sulfur compound, orB. a metal carbonyl compound.Type: GrantFiled: March 29, 1976Date of Patent: November 29, 1977Assignee: Dynamit Nobel AktiengesellschaftInventors: Moustafa El Chahawi, Hermann Richtzenhain
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Patent number: 4036819Abstract: An unsaturated polyester having recurring units of the formula ##STR1## wherein A is an alcoholic moiety, Q is a moiety of other saturated dicarboxylate acids and B is a moiety of an unsaturated dicarboxylic acid, n is 1 to 4, the sum l + m + g is 2 to 20 and l may be 0 or a whole number, said polyester generally having between 1 and 80 mole percent of a chlorinated phenylene acetic acid moiety whose formula is ##STR2## a solution of said such unsaturated polyester, particularly a solution of the same in a copolymerizable monomer, formed objects thereof and a process for the preparation of such unsaturated polyester.Type: GrantFiled: May 15, 1975Date of Patent: July 19, 1977Assignee: Dynamit Nobel AktiengesellschaftInventors: Moustafa El-Chahawi, Norbert Vollkommer
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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
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Patent number: 3974202Abstract: In a process of producing an alkyl ester of a substituted or unsubstituted arylacetic acid wherein a substituted or unsubstituted aromatic halogen methyl compound is reacted with carbon monoxide and an alcohol having an alkoxy group the same as that of said ester, the improvement which comprises carrying out said reaction in a basic reaction medium in the presence as catalyst of:A. cobalt salt, metal or metal alloy and a sulfur compound, orB. a metal carbonyl compound.Type: GrantFiled: August 10, 1973Date of Patent: August 10, 1976Assignee: Dynamit Nobel AktiengesellschaftInventors: Moustafa El-Chahawi, Hermann Richtzenhain