E.i. Dupont De Nemours and Company

Ducoa L.p.

Conoco Inc.

Geneprint Corporation

Harold E Bellis

Edward Francis McBride

Kamlesh Kumar Bhatia

Donald J Dumas

George C Sonnichsen

Donald L Whitfill

Vinayakam Subramanyam

Charles R Clark

Chester A Thayer, Ii

Mark Harry Krackov

D Philip Cords

Donald E Booker

Virginia M Osterman

Charles J Denham

Edward J Balthazar

Owen B Mathre

Thomas Robert Jemison

Process for producing high purity aqueous solutions of betaine by reaction of substantially equal molar ratios of trimethylamine and an alkaline salt of monochloroacetic acid in aqueous solution.

Process for making aqueous betaine solutions

A process for the combined synthesis of betaine and choline chloride from monochloroacetic acid, trimethylamine and ethylene oxide by first reacting trimethylamine with monochloroacetic acid, and then reacting ethylene oxide with the reaction product from the previous step.

Process for the combined synthesis of betaine and choline chloride

The invention is directed to a process for the synthesis of curcumin and curcumin-related compounds by reacting the enol form of a 2,4-diketone with a monocarbocyclic aldehyde in the presence of an organic amine catalyst. The reactants are dissolved in a highly polar, aprotic organic solvent. The curcumin-related product is recovered in crystalline form by precipitation from the reaction mass and solvent recrystallization.

Process for the synthesis of curcumin-related compounds

A process for preparing lactide or glycolide from a lactic acid oligomer or glycolic acid oligomer is disclosed where the molecular weight of the synthesis reactor residue is controlled to no more than 1.2 times that in the feed. The process is carried out at 130.degree. to 280.degree. C. and preferably 180.degree. to 210.degree. C. using from 1 to 6 weight percent catalyst in the oligomer feed to the synthesis reactor. The catalysts are tin or tin compounds, yttrium or rare earth metal compounds, or antimony compounds which are known as alphahydroxycarboxylic acid cyclic dimerization or polymerization catalysts.

Process for the synthesis of lactide or glycolide from lactic acid or

The depolymerization of poly(hydroxyacids) in a liquid medium is enhanced by the presence of a quaternary ammonium compound. Poly(hydroxyacid) polymers containing a quaternary ammonium salt are more readily depolymerized.

Rapidly degradable poly (hydroxyacid) compositions

A process for solubilizing solid formaldehyde oligomers without contaminating the solution product with undesirable solvent products by treating the oligomer with heated hydroxyacetic acid.

Process for solubilizing formaldehyde oligomers

A continuous catalyzed vapor phase process for the production of dimeric cyclic esters which comprises converting the corresponding alpha-hydroxy-carboxylic acid or ester in the vapor phase over a solid catalyst, such as a silica-alumina, preferably a silica-alumina having a high silica content, in the presence of a carrier of gas.

Continuous catalyzed vapor phase dimeric cyclic ester process

Solid compositions comprising water degradable oligomers of hydroxyacetic acid and lactic acid having molecular weights of 800-4000 and containing 40-60 mole percent hydroxyacetic acid. The compositions are useful as controlled release agents for chemicals, especially as a toilet bowl cleaning component. Optional ingredients include dyes, fragrances, filler materials, surfactants, algicides, pest control agents, quaternary ammonium salts, and mixtures thereof.

Biodegradable compositions for controlled release of chemical agents

A process is provided for the production of lactones by the catalytic dehydrogenation of aliphatic diols containing from 3-7 carbon atoms and optionally one or more ether linkages in the diol chain. The reaction is conducted in the liquid phase with a copper chromite catalyst at a temperature of from about 150.degree.-250.degree. C. in the absence of added hydrogen, and preferably at reaction conditions where yields are about 99%.

Dehydrogenation of diols

Oil field chemicals are incorporated in polymeric particles of the condensation product of hydroxyacetic acid or the co-condensation product of hydroxyacetic acid and other compounds containing hydroxy-, carboxylic acid-, or hydroxycarboxylic acid moieties. The particles are introduced into an oil well bore and/or subterranean oil formation where the polymeric particles dissolve over a period of time and release the oil field chemicals.

Placement process for oil field chemicals

Phenyl esters of substituted acids are prepared by a two-step process in which a phenol derivative is first treated with an acid halide to yield a phenyl ester intermediate, and the intermediate is reacted with an appropriate nucleophile.

Process for preparing phenyl esters of substituted acids

Monomethylformamide and dimethylformamide are produced by the catalytic reaction of formamide and methanol, using a quaternary ammonium compound as the catalyst.

Method for producing monomethylformamide and dimethylformamide

A process for making highly pure cyclic esters by heating a copolymer of .alpha.-hydroxy acid or its ester on a thermally stable polyether core.

Process for preparing highly pure cyclic esters

This invention relates to a composition and method of temporarily reducing the permeability of subterranean formations penetrated by a wellbore. In particular, it relates to an inexpensive, low molecular weight condensation product of hydroxy acetic acid with itself or compounds containing other hydroxy-, carboxylic-acid-, or hydroxycarboxylic-acid moieties and method for preventing fluid loss during well treatment.

Composition and method for temporarily reducing permeability of

In the process of preparing substituted formamides by the catalytic oxidation of substituted tertiary amines, in which a metal halide catalyst is used in conjunction with an alkali metal halide corrosion inhibitor, pitting of equipment can be inhibited by including in the reaction medium a primary alkylamine, urea or a substituted urea, or thiourea or a substituted thiourea.

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Wilmington, DE, United States of America

Harold E Bellis