Dynamit Nobel Aktiengesellschaft

Huels Aktiengesellschaft

Moustafa El-Chahawi

Wilhelm Vogt

Uwe Prange

Hermann Richtzenhain

Fritz Englaender

Manfred Kaufhold

Norbert Vollkommer

Gunter Meyer

Hermann Richtzenheim

A process for preparing acetaldehyde diethyl acetal is provided which involves:

Process for preparing acetaldehyde diethyl acetal

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.

Method for the preparation of 3-aminoacrylic acid esters

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.

Method of preparing pure carboxylic acids

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.

Process for the preparation of alkali-metal formyl acid esters

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.

Method for preparation of arylpyruvic acid

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

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.

Process for the preparation of .alpha.-hydroxymethylene arylacetic acid

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

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

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.

Unsaturated polyester resins

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.

Butyric acid esters

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:

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Troisdorf, Germany

Moustafa El-Chahawi