Inventor

GEHRMANN KLAUS

DE44 patents

Patents

44 patents

US4003723AJan 18, 1977

Purification of crude hydrogen chloride

HOECHST AG57 citations94

US4664753AMay 12, 1987

Process for separating iodine and its compounds from the carbonylation products obtained by subjecting dimethylether, methyl acetate or methanol to a carbonylation reaction

HOECHST AG31 citations92

US4556644ADec 3, 1985

Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether

HOECHST AG32 citations92

US4430273AFeb 7, 1984

Production of acetic anhydride

HOECHST AG35 citations92

US4280010AJul 21, 1981

Continuous production of alkyl acrylates free from ether

HOECHST AG44 citations92

US4629711ADec 16, 1986

Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether

HOECHST AG23 citations82

US4557760ADec 10, 1985

Process for recovering noble metals belonging to group VIII of the Periodic System of the elements from a contaminated catalyst solution originating from the carbonylation of methyl acetate and/or dimethylether

HOECHST AG22 citations82

US4333884AJun 8, 1982

Production of acetic anhydride

HOECHST AG26 citations81

US3954854AMay 4, 1976

Recovery of monomeric acrylic acid from residues originating from processed crude acrylic acid

HOECHST AG29 citations81

US4206078AJun 3, 1980

Production of space abrasion-resistant active carbon carriers or catalysts

HOECHST AG24 citations80

US4012439AMar 15, 1977

Continuous production of n-butylacrylate free from dibutylether

HOECHST AG21 citations78

US4746640AMay 24, 1988

Process for purifying and recovering catalyst solution contaminated during the carbonylation of methyl acetate and/or dimethylether

HOECHST AG10 citations74

US4444624AApr 24, 1984

Process for separating acetone from carbonylation mixtures

HOECHST AG18 citations73

US4442304AApr 10, 1984

Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether

HOECHST AG12 citations73

US4440570AApr 3, 1984

Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether

HOECHST AG9 citations73

US4414160ANov 8, 1983

Process for making carboxylic acid halides

HOECHST AG8 citations73

US4717454AJan 5, 1988

Process for removing acetone from reaction mixtures of carbonylation reactions

HOECHST AG17 citations72

US4549937AOct 29, 1985

Process for separating the catalyst system from the reaction mixtures of carbonylation reactions

HOECHST AG7 citations72

US4518538AMay 21, 1985

Process for the continuous production of 2-carboxyethyl-alkyl-phosphinic acid dialkylesters

HOECHST AG4 citations60

US4549995AOct 29, 1985

Process for making alkanephosphonous acid esters

HOECHST AG5 citations60

US4252983AFeb 24, 1981

Production of acetic anhydride and acetic acid from acetaldehyde

HOECHST AG4 citations60

US4104299AAug 1, 1978

Production of pure methyldichlorophosphane

HOECHST AG3 citations60

US4045295AAug 30, 1977

Purification of sulfuric acid containing acetic acid

HOECHST AG6 citations60

US4319038AMar 9, 1982

Production of 1,1-diacetoxyethane

HOECHST AG3 citations57

US3978146AAug 31, 1976

Production of 2-chlorobutadiene-1,3

HOECHST AG6 citations57

US3957899AMay 18, 1976

Production of monovinylacetylene

HOECHST AG4 citations57

US5169982ADec 8, 1992

Process for separating iodine and its compounds from the products obtained on subjecting dimethylether, methyl acetate or methanol to carbonylation

HOECHST AG6 citations56

US4892971AJan 9, 1990

Process for the preparation of n-acetylphenylalanine

HOECHST AG0 citations51

US4318865AMar 9, 1982

Production of 2-chloroformylethylmethylphosphinic acid chlorides

HOECHST AG1 citations51

US4261923AApr 14, 1981

Process permitting the deposition of solid matter in mixtures containing methyldichlorophosphane to be inhibited

HOECHST AG1 citations51

US4209460AJun 24, 1980

Production of pure acetyl chloride

HOECHST AG0 citations51

US4898966AFeb 6, 1990

Process for the preparation of phenylalanine n-propyl ester hydrochloride

HOECHST AG1 citations50

US4351972ASep 28, 1982

Process for making anhydrous alkyl iodides

HOECHST AG0 citations47

US4352761AOct 5, 1982

Production of acetyl chloride

HOECHST AG0 citations36

GEHRMANN KLAUS

Patents

Purification of crude hydrogen chloride

Process for separating iodine and its compounds from the carbonylation products obtained by subjecting dimethylether, methyl acetate or methanol to a carbonylation reaction

Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether

Production of acetic anhydride

Continuous production of alkyl acrylates free from ether

Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether

Process for recovering noble metals belonging to group VIII of the Periodic System of the elements from a contaminated catalyst solution originating from the carbonylation of methyl acetate and/or dimethylether

Production of acetic anhydride

Recovery of monomeric acrylic acid from residues originating from processed crude acrylic acid

Production of space abrasion-resistant active carbon carriers or catalysts

Continuous production of n-butylacrylate free from dibutylether

Process for purifying and recovering catalyst solution contaminated during the carbonylation of methyl acetate and/or dimethylether

Process for separating acetone from carbonylation mixtures

Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether

Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether

Process for making carboxylic acid halides

Process for removing acetone from reaction mixtures of carbonylation reactions

Process for separating the catalyst system from the reaction mixtures of carbonylation reactions

Process for making methyldichlorophosphane

Carrier-supported catalyst and process for making it

Production of methyldichlorophosphane

Continuous production of 2,5-dioxo-1-oxa-2-phospholanes

Production of beta-halogenoformyl-ethyl phosphinic acid halides

Distillative purification of 2,5-dioxo-1-oxa-2-phospholanes

Production of methyldichlorophosphane

Process for making carboxylic acid halides

Process for the manufacture of acrylic acid

Carrier-supported catalyst and process for making it

Process for the continuous production of 2-carboxyethyl-alkyl-phosphinic acid dialkylesters

Process for making alkanephosphonous acid esters

Production of acetic anhydride and acetic acid from acetaldehyde

Production of pure methyldichlorophosphane

Purification of sulfuric acid containing acetic acid

Production of 1,1-diacetoxyethane

Production of 2-chlorobutadiene-1,3

Production of monovinylacetylene

Process for separating iodine and its compounds from the products obtained on subjecting dimethylether, methyl acetate or methanol to carbonylation

Process for the preparation of n-acetylphenylalanine

Production of 2-chloroformylethylmethylphosphinic acid chlorides

Process permitting the deposition of solid matter in mixtures containing methyldichlorophosphane to be inhibited

Production of pure acetyl chloride

Process for the preparation of phenylalanine n-propyl ester hydrochloride

Process for making anhydrous alkyl iodides

Production of acetyl chloride