Hoechst Aktiengesellschaft

Hoeschst Aktiengesellschaft

Ernst I Leupold

Friedrich Wunder

Hans-Jurgen Arpe

Hans-Joachim Schmidt

Herbert Baltes

Heinz Litterer

Klaus Eichler

Robert K Driscoll

Horst Hachenberg

Merten Schlingmann

Udo Dettmeier

Marita Neuber

Gunter Roscher

Wolfram Fritsche-Lang

Wolfgang Ebertz

Frank P Sistig

Theodor Papenfuhs

Gerhard Buhr

Franz-Josef Dany

Hans Joachim Metz

Andreas Elsaesser

Adolf Heinz Linkies

Klaus Unger

Hans W Frass

Werner Gohla

Matthias Gutweiler

Carl Christoph Mollenkopf

Matthias Wiesner

Walter Reimann

Bernd Laugwitz

Ulrich Meyer-Blumenroth

Karl-Heinz Schonwalder

Georg Weichselbaumer

Ernst-Gunther Schlosser

Wolf-Dietmar Kaufmann

Joachim Schutz

Knut Rapp

Gunther Duchatsch

Albert Renken

Knut Popp

Eduard Zeisberger

Manfred Kauffelt

Willi Herzog

Gustav Gimpel

Process for preparing alkanephosphonic anhydrides of the formula (I) ##STR1## where R is straight-chain or branched unsubstituted C.sub.1 -C.sub.6 -alkyl and n.gtoreq.3, which comprises pyrolytically eliminating water from an alkanephosphonic acid of the formula (II) or a pyroalkanephosphonic acid of the formula (III) ##STR2## where R is straight-chain or branched C.sub.1 -C.sub.6 -alkyl, without addition of solvent and removing the water from the reaction mixture by means of an inert gas stream.

Process for preparing alkanephosphonic anhydrides

Process for the recovery of catalyst in the production of ether carboxylic acids by catalytic oxidation with a suspended ether catalyst in which the reaction mixture is subjected to cross-flow filtration.

Process for catalyst recovery

Process for the preparation of monoisopropylnaphthalene by alkylation of naphthalene with the aid of zeolites of the faujasite type as catalysts, wherein the cations of the zeolites have been replaced by alkaline earth metal ions.

Process for the preparation of monoisopropylnaphthalene

Process for the purification of organic compounds contaminated by dissolved metal compounds. The present invention relates to a process for the purification of organic compounds contaminated by dissolved metal compounds, by bringing the contaminated organic compound into contact with an ion exchanger resin, the functional group of which contains both a secondary amine group and a phosphonate salt radical and/or a phosphonic acid radical.

Process for the purification of organic compounds contaminated by

The present invention relates to a developer composition for radiation-sensitive positive-working and negative-working and reversible reprographic layers which apart from a radiation-sensitive compound or radiation-sensitive combination of compounds contain, as an essential constituent, a binder which is insoluble in water but soluble in aqueous-alkaline solutions, said developer composition being characterized in that it contains, as essential constituents,

Developer composition for irradiated, radiation-sensitive

Process for the preparation of fluorobenzenes

Sucrosetricarboxylic acid can be prepared by oxidizing sucrose with oxygen, if desired in a mixture with inert gases, by means of a more effective catalyst than platinum/alumina. The product can be used in washing agents or as a food additive.

Sucrosetricarboxylic acid and compositions containing the same

The process for separating off rare metal catalysts used in the preparation of ether-carboxylic acids by catalytic oxidation with a suspended catalyst comprises carrying out a crossflow filtration and pretreating the filter elements used with a medium which is not solid under the treatment conditions and is composed of one or more carboxylic acids.

Process for separating catalysts from suspensions by filtration

A process for the acylation of naphthyl ethers of the formula ##STR1## using acylating agents of the formula R.sup.2 --CO--X to give acylated naphthyl ethers of the formula ##STR2## in which R.sup.1 and R.sup.2 independently of one another are C.sub.1 -- to C.sub.10 -alkyl, C.sub.2 -- to C.sub.10 -alkenyl or C.sub.3 - to C.sub.8 -cycloalkyl and R.sup.2 is additionally C.sub.6 - to C.sub.10 -aryl and X is Cl, Br, --OCOR.sup.2, OH or C.sub.1 - to C.sub.3 -alkoxy, comprises carrying out the reaction presence of zeolite catalysts which have the formula Z.Al.sub.2 O.sub.3.x SiO.sub.2 (III) in the anhydrous and template-free form, in which Z is M.sup.I.sub.2 O, M.sup.II O and/or (M.sup.III).sub.2 O.sub.3, in which M.sup.I is an alkali metal atom, ammonium or a hydrogen atom, M.sup.II is an alkaline earth metal atom and M.sup.III is a rare earth metal of atomic number 57 to 71 in the periodic table of the elements, and x is a number from 4 to 4000, with the proviso that at least 50% of the negative lattice charges are compensated by protons, ammonium and/or the other metal ions mentioned under M.sup.II and M.sup.III, and the pores of which are formed from at least 10 tetrahedral atoms.

Process for the acylation of naphthyl ethers with the aid of zeolite

Process for the oxidation of dialkyl esters of 2-hydroxy-ethylphosphonic

A process for the preparation of a mixture of sucrose oxidation products which contains a salt of sucrosetricarboxylic acid and which is obtained by reaction of sucrose with oxygen in an aqueous medium in the presence of a platinum metal/active carbon catalyst at elevated temperatures and neutralization of the reaction product to convert into the salt form, which comprises the reaction being carried out discontinuously, the starting materials being heated stepwise over the course of several hours from room temperature up to 60.degree. to 95.degree. C. and then the reaction product being isolated where appropriate. The oxidation products obtained in this way have, in particular, improved washing properties.

Process for the preparation of a mixture of sucrose oxidation products

Process for the preparation of 2-chloro- or 2-bromonaphthalene by isomerizing 1-chloro- or 1-bromonaphthalene over a zeolite as a catalyst which, in the anhydrous and template-free form, has the general formula (A)

Process for the preparation of 2-chloro- or 2-bromo-naphthalene

Acetals of polyvinyl alcohol are described in which at least some of the acetal groups are derived from terminally etherified oxyethylene aldehydes/oxaalkanals of the formula ##STR1## The new acetals are internally plasticized and can be processed thermoplastically without external plasticizers. Depending on the nature of the radical R, which can be aliphatic, cycloaliphatic or aromatic, and the size of n, an integer, preferably 1 to 3, and, on the nature of other aldehydes which may be co-used for mixed acetalation, the new acetals are soluble in water or organic solvents.

Polyvinyl acetals and their use

The invention relates to a process for preparing carboxylic acids by platinum-catalyzed oxidation of primary alcohols of limited water solubility with oxygen in a mixture of water and a solubilizer. The solubilizer used is an ether of the general formula R.sub.1 O(CH.sub.2 CH.sub.2 O).sub.n R.sub.2, where n is 1-4 and R.sub.1 and R.sub.2 are alkyl radicals having 1-4 carbon atoms.

Process for preparing carboxylic acids

A process for the oxidation of 5-hydroxymethylfurfural which comprises oxidizing 5-hydroxymethylfurfural in an aqueous medium with oxygen in the presence of a catalyst which contains at least one metal of the platinum group.

Process for the oxidation of 5-hydroxymethylfurfural

Growing community of inventors

Neu-Anspach, Germany

Ernst I Leupold