Dynamit Nobel Aktiengesellschaft

Degussa Aktiengesellschaft

Uwe Prange

Wilhelm Vogt

Moustafa El-Chahawi

Hermann Richtzenhain

Christoph Theis

Frank Bauer

Moustafa El Chahawi

Hermann Peeters

Wilfried Latz

Hermann Richtzenheim

Hermann Richtzenbain

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.

Process for recovering catalyst transition metals from salt-containing reaction mixtures

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.

Process for preparing malonic diesters in a reactor with internal heat exchangers

3-Alkoxy acrylonitriles are obtained directly from the corresponding nitriles by reaction of carbon monoxide and alcoholates followed by reaction with organic halides.

Method of preparing 3-alkoxy acrylonitriles

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.

Method of preparing malonic acid dialkyl esters

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.

Method and apparatus for performing carbonylation reactions

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.

A process for the preparation of a .beta.-alkoxyacrylonitrile of the formula

Method of preparing .beta.-alkoxyacrlonitriles

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.

Process for the recovery of cobalt values

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

Method of preparing .alpha.-hydroxymethylene nitriles

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.

Method of preparing .alpha.,.beta.-unsaturated carboxylic acid esters

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 and

Method of preparing .alpha.-substituted cyanoacetic acid alkyl esters

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.

Growing community of inventors

Niederkassel, Germany

Uwe Prange