Basf Aktiengesellschaft

Basf Se Corporation

Walter Disteldorf

Jarren Peters

Bernd Morsbach

Katrin Friese

Günther Golfier

Boris Breitscheidel

Thomas Schäfer

Christoph Übler

Kurt Schwirten

Wolfgang Eisfeld

Rudolf Kummer

Albert Hettche

Marc Walter

Heinz-Walter Schneider

Oliver Bey

Hans-Uwe Schenck

Udo Reiter

Rolf-Dieter Kohler

Wolfgang Richter

Edgar Zeller

Bernd Bessling

Helmut Lehmann

Lucien Thil

Uwe Storzum

Jean Werner Knab

Bernd Lohe

Richard Selberdinger

Klaus Rossato

J&uuml;rgen Holzmann

Christiane Haller

Knut Dornik

Rudiger Welker

Jürgen Holzmann

Gunther Golfier

Guenther Golfier

Thomas SCHÄFER

The invention relates to a method for producing carboxylic esters by converting a carboxylic acid or a carboxylic acid anhydride or a mixture thereof with an alcohol in a reaction system comprising one or more reactors, wherein reaction water is distilled as alcohol-water-azeotrope with the vapors, the vapors are at least partially condensed, the condensate is separated into an aqueous phase and an organic phase and said organic phase is supplied at least partially back into said reaction system. Components boiling lower than the alcohol are at least partially removed from said returned organic phase such as wherein components boiling lower than alcohol are evaporated and/or distilled off. An enrichment in the reaction system of by-products boiling lower than alcohol is avoided. Alcohol losses can be minimized by discharge currents.

Method for producing carboxylic acid esters

The invention relates to a method for producing carboxylic acid esters by reacting a reaction mixture, comprising a carboxylic acid and/or a carboxylic acid anhydride, and an alcohol in a reaction system having one or more reactors, wherein reaction water is distilled off as an alcohol/water azeotrope with the exhaust vapor. In addition, the reaction mixture is treated with superheated alcohol vapor. The method allows the production of esters having a low acid number.

Production of carboxylic acid esters by stripping with alcohol vapor

The invention relates to a raw ester of an esterification reaction catalyzed by a metal-containing esterification catalyst generated by a) mixing the raw ester at a temperature T of more than 100&#xb0; C. under a pressure p that is equal to or greater than the vapor pressure of water at the temperature T with an aqueous base, b) relaxing the ester-base mixture and evaporating water, c) mixing the obtained fluid phase with water forming a water-in-oil emulsion, d) distilling water out of said emulsion and e) filtering the ester. Said method results in esters having low acid value and residues accrue in easily filterable form in the solid catalyst residues.

Method for regeneration of raw ester

A process is described for preparing esters of an acid component selected from among polybasic C-Ccarboxylic acids and an alcohol component selected from among C-Calkanols or from among C-Calkanediols, the alkyl chain of which may have interruption by from 1 to 3 oxygen atoms, by a) heating at boiling point, in a reaction zone and in the presence of an esterification catalyst, a mixture essentially consisting of the acid component or of an anhydride thereof and of the alcohol component, b) using rectification to separate the vapor comprising alcohol and water into an alcohol-rich fraction and a water-rich fraction, and c) returning the alcohol-rich fraction into the reaction zone and conducting the water-rich fraction out of the process. The process is simple to carry out and permits rapid achievement of essentially quantitative conversion.

Method for producing esters of multibasic acids

A process is described for preparing mixtures of diesters of phthalic acid with decanols and tridecanols by reacting phthalic acid or a reactive derivative of phthalic acid with a mixture made from at least one decanol and at least one tridecanol. Mixtures obtainable in this way are also described, as is their use as plasticizers for molding compositions, and also mixtures of isomeric tridecanols suitable for preparing the mixtures of diesters.

Method for producing blends of phthalic acid diesters, decanols and tridecanols

Process for removal of the esterification catalyst by separation from a crude plasticizer ester obtained by reacting a dicarboxylic acid with C&#x2013;Calcohols, by treating the crude ester with an aqueous alkali solution in the range from 10 to 100&#xb0; C. and then separating the aqueous alkaline phase comprising the hydrolyzed esterification catalyst by gravitational phase separation, by treating the crude ester, prior to or during the phase separation, with a salt of a di- or polyvalent metal, or with a mixture of these salts.

Method for separating an esterification catalyst

Polyesters blocked with isomeric nonanols, method for producing them and use thereof as softeners

Mixture of diesters of adipic or phthalic acid with isomers of nonanols

A process for preparing esters from alcohol and carboxylic acid by a) feeding a mixture, comprising at least alcohol and/or carboxylic acid as educts, into a distillation column with separated sections containing reactive and conventional internals, wherein the reactive internals are arranged below the inlet of the mixture and conventional internals are arranged above the inlet of the mixture, b) reaction of the alcohol and the carboxylic acid in the reactive internals in presence of a catalyst, c) distillative separation of the evolving reaction mixture into the higher boiling ester and a lower boiling azeotrope containing alcohol, water and ester, wherein the ester accumulates in the bottom and the azeotrope is removed overhead, d) separation of the azeotrope in a phase separator in an aqueous phase and in an organic phase and the organic phase to be returned to the top of the column, wherein in step b) a heterogenous catalyst is utilized and in step c) the ester is taken off above the bottom as pure product between further conventional internals which differ in their arrangement from those in step a) and which are arranged above the inlet of a circulating evaporator.

Process for preparing esters of carboxylic acids

4,4'-diaminobenzophenones of the formula I ##STR1## where the rings A and B can be further substituted, are prepared by a process in which a compound of the formula II ##STR2## where the rings A, B and E can be substituted, is oxidized with aqueous nitric acid in the presence of nitrobenzene or of an alkanoic acid and under superatmospheric pressure, and the reaction product is cleaved. The process according to the invention gives the compounds of the formula I in high yield and purity.

Preparation of 4,4'-diaminobenzophenones

Pure monoesters of adipic acid are prepared by a process in which

Preparation of pure monoesters of adipic acid

Thermosetting polycondensates containing amide and imide groups which are obtained by reacting 1,2,3,4-butanetetracarboxylic acid or its anhydride with one or more aliphatic, cycloaliphatic or aromatic diamines and one or more oxadicarboxylic acids or oxadicarboxylic acid esters of the general formula

Thermosetting polycondensates containing amide and imide groups, and

Pure halonaphthalic acid anhydrides are prepared from haloacenaphthenes by oxidation with nitric acid in a mixture of aliphatic carboxylic acid, water and nitric acid in the presence of vanadate, with or without further metal salts, at an elevated temperature and the reaction product is isolated and subjected to an oxidative after-treatment with hypochlorite in aqueous solution at a pH of from 9 to 12 at an elevated temperature. The products are intermediates for the manufacture of optical brighteners.

Manufacture of very pure halonaphthalic acid anhydrides

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Wachenheim, Germany

Walter Disteldorf