E.i. Dupont De Nemours and Company

University of Delaware

E. I. Du Pont De Nemours + Company

Loren D Brake

George C Sonnichsen

David Richard Corbin

Horacio E Bergna

Henry C Foley

Konstantinos Kourtakis

Ravindra K Mariwala

Narayanan Sankara Subramanian

David S Lafyatis

Davis S Lafyatis

This invention provides an attrition resistant catalyst composition and method for producing such composition. The catalyst is comprised of an acidic zeolite, rho or chabazite, and a particulate binder, kaolin, bentonite, alpha-alumina, or titania, which can be optionally modified by treatment with a compound containing Si, Al, P or B. This invention further provides a process for producing methylamines, preferably dimethylamine, comprising reacting methanol and/or dimethyl ether and ammonia in the presence of a catalytic amount of an attrition resistant catalyst of the invention.

Attrition resistant zeolite catalysts for production of methylamines in

The present invention relates to an improved catalyst for the selective synthesis of monomethylamine (MMA) and dimethylamine (DMA) at the expense of trimethylamine (TMA) for a starting feed of methanol and/or dimethyl ether and ammonia. The current industrial catalyst for this process is a standard SiO.sub.2 /Al.sub.2 O.sub.3 material. The present invention combines this standard catalyst with microporous carbon molecular sieves (CMS) to form a composite material (i.e., a CMS/SiO.sub.2 /Al.sub.2 O.sub.3 material) with higher selectivity for the desired products MMA and DMA. The invention also relates to methods of making the improved catalyst and a process of using the improved catalyst material in the production of MMA and DMA.

CMS/SiO.sub.2 /Al.sub.2 O.sub.3 catalysts for improved selectivity in

Depolymerizing high molecular weight polyhydroxy acid by reacting with an amine to produce an amide derivative.

Preparation of amide derivatives of hydroxy acids

Depolymerizing polyhydroxy acid by heating with the alcohol of 1-6 carbon atoms in the presence of an acid catalyst to produce an alkyl ester.

Preparation of alkyl esters by depolymerization

Rapid recovery from waste of high molecular weight polyhydroxyacid content by depolymerizing the PHA in acidic water.

Rapid depolymerization of polyhydroxy acids

Polyhydroxyacid (PHA) is recovered by heating under pressure in the presence of a C.sub.1 -C.sub.6 alcohol, and optionally also water.

Recovery of polyhydroxy acids

Recovery of polyhydroxy acids (PHAs) from waste containing high molecular weight polyhydroxy acid polymer by depolymerizing the PHA in water at elevated temperature and pressure.

A formaldehyde/amine adduct useful in water treatment having improved stability made by reacting formaldehyde and a secondary amine, limiting the water content of the adduct to no more than 30 weight percent, optionally, adding an alcohol.

Process of preparing formaldehyde/amine adducts

A formaldehyde/amine adduct useful in water treatment having improved stability made by reacting formaldehyde and a secondary amine, limiting the water content of the adduct to no more that 30 weight percent, optionally, adding an alcohol.

Formaldehyde/amine adduct

In the preparation of dimethyl ether by the catalytic dehydration of methanol, reaction rate is enhanced and catalyst coking and byproduct formation are significantly reduced when an aluminosilicate containing a high level of alumina is used as the catalyst.

Catalytic preparation of dimethyl ether

In the preparation of dimethyl ether by the catalytic dehydration of methanol, reaction rate is enhanced and catalyst coking and byproduct formation are significantly reduced when an aluminotitanate containing 0.1-20% of titania and 80-99.9% of alumina is used as the catalyst.

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Wilmington, DE, United States of America

Loren D Brake