Celanese Gmbh

Fmc Corporation

Hoechst Celanese Corporation

Celanese International Corporation

Edward F Dougherty

Mark O Scates

James L Paul

Charles C Hobbs, Jr

Leon B Levy

A Thomas Weibel

Madan Singh

Quentin G Hopkins

Harold Robert Gerberich, Jr

Paul James L

James E Sanborn

Jerome F Perez

A process for inhibiting free-radical polymerization of an alpha,beta-unsaturated (&agr;,&bgr;-unsaturated) carboxylic acid, and for providing desired grade &agr;,&bgr;-unsaturated carboxylic acid for use following storage and transport is described herein. In particular, bulk storage and shipment such as with overseas transport is described. The process comprises combining the &agr;,&bgr;-unsaturated carboxylic acid with a phenolic inhibitor and a coinhibitor to form an inhibited mixture, storing the inhibited mixture, transporting the inhibited mixture, and removing the coinhibitor to provide the desired grade &agr;,&bgr;-unsaturated carboxylic acid for use. In preferred embodiments, the &agr;,&bgr;-unsaturated carboxylic acid is acrylic acid, the phenolic inhibitor is p-methoxyphenol, the coinhibitor is manganese cation, and removal of the coinhibitor is carried out using an ion exchange resin.

Stabilization and transport of &agr;, &bgr;-unsaturated carboxylic acid and removal of stabilizer

A working solution for producing hydrogen peroxide, containing an alkylanthraguinone working compound dissolved in a solvent, is regenerated by contacting the working solution with a catalyst containing from 5% to 100% boehmite at a temperature of 25&deg; C. to 150&deg; C. At least a portion of the tetrahydro-alkylanthraquinone epoxide present in the working solution is converted to working compound to maintain the composition of the working solution within specified limits.

Reversion of expoxide in the production of Hydrogen peroxide

A process for inhibiting free-radical polymerization of an alpha,beta-unsaturated (.alpha.,.beta.-unsaturated) carboxylic acid, and for providing desired grade .alpha.,.beta.-unsaturated carboxylic acid for use following storage and transport is described herein. In particular, bulk storage and shipment such as with overseas transport is described. The process comprises combining the .alpha.,.beta.-unsaturated carboxylic acid with a phenolic inhibitor and a coinhibitor to form an inhibited mixture, storing the inhibited mixture, transporting the inhibited mixture, and removing the coinhibitor to provide the desired grade .alpha.,.beta.-unsaturated carboxylic acid for use. In preferred embodiments, the .alpha.,.beta.-unsaturated carboxylic acid is acrylic acid, the phenolic inhibitor is .rho.-methoxyphenol, the coinhibitor is manganese cation, and removal of the coinhibitor is carried out using an ion exchange resin.

Stabilization and transport of .alpha.,.beta.-unsaturated carboxylic

Black acid or the sulfuric acid residue obtained in the manufacture of ethyl acrylate by reaction of ethylene and acrylic acid in the presence of sulfuric acid is heated and distilled in the presence of a solvent for recovery of acrylic acid and ethyl acrylate.

Recovery of acrylic acid and/or ethyl acrylate from black acid

An apparatus and a method is provided for measuring the rate of flow of gas from a sample of a peroxygen, such as, hydrogen peroxide, thereby indicating the stability of the peroxygen. The invention overcomes the disadvantages of the prior methods which are less precise and have a long time delay.

Apparatus for determining the stability of a peroxygen

A method for stabilizing hydrogen peroxide and the stabilized composition are claimed employing as a stabilizer a tin (II) salt of an acid selected from the group hydrofluoric acid, C6 to C17 saturated monocarboxylic acids and C2 to C6 saturated polycarboxylic acids, preferably oxalic acid. The tin content of hydrogen peroxide prepared from a tin (II) oxalate stock solution can be reduced by filtration to less than 1 mg/l if the tin oxalate stock solution has been properly aged.

Tin (II) stabilizer for hydrogen peroxide

A stable hydrogen peroxide composition is provided of from 1% to 52% by weight hydrogen peroxide and 1,10-phenanthroline. The composition may contain other conventional additives suitable for stabilizing hydrogen peroxide.

Stabilized hydrogen peroxide

This invention describes an improved process for the production of C.sub.1 -C.sub.8 alkyl acrylate by the reaction of a C.sub.1 -C.sub.8 alkyl alcohol with acrylic acid in the presence of esterification catalysts and soluble manganese or cerium ions.

Process for production of alkyl acrylates

New and improved compositions are described of ethylenically unsaturated organic compounds capable of addition polymerization stabilized from unintentional or premature polymerization in the liquid phase by the addition of the combination cerium compounds which are soluble in the ethylenically unsaturated organic compounds and phenolic type inhibitors.

Stabilized ethylenically unsaturated organic compositions

In the process of producing ethyl acrylate by the reaction of ethylene and acrylic acid in the presence of sulfuric acid, using phenolic type inhibitors, soluble manganese or cerium salts are additionally utilized.

Process for production of ethyl acrylate

A process for producing fatty acids from C.sub.20 to C.sub.30 normal alkanes by air oxidizing the alkanes, followed by hydrogenating the product of the air oxidation and then oxidizing the hydrogenated product by nitric acid oxidation. The crude fatty acid product may be purified by a second hydrogenation to convert nitrogen impurities to amines and removal of the amines.

Production of fatty acids from alkanes by oxidation

A process for the conversion of carboxyl groups to methylol groups by hydrogenolysis utilizing a platinum catalyst.

Production of alcohols from carboxylic acids

Process for hydrogenolysis of an alkali metal or an alkaline earth metal salt of formic acid so as to produce methanol and a metal hydroxide corresponding to the formic acid salt wherein a catalyst of cobalt, rhenium, ruthenium, palladium, platinum or mixtures thereof is used.

Hydrogenolysis of formates

In the production of 1,6-hexanediol by oxidation of cyclohexane to produce an acidic oxidation product comprising adipic acid, followed by esterification of the acidic oxidation product and a subsequent hydrogenolysis of the ester, the improvement which comprises a prehydrogenation of the acidic oxidation product prior to esterification thereof.

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League City, TX, United States of America

Edward F Dougherty