Other

Exxon Research and Engineering Company

Elena N Suciu

Robert C Michaelson

Ramzi Yanni Saleh

Barbara Kuhlmann

Arie Bortinger

Wim J Pieters

George A Knudsen

A process for making a dialkyl carbonate which comprises reacting urea with a first alcohol in a carbamate reactor at a temperature and pressure sufficient to convert said urea to an alkyl carbamate; and reacting the alkyl carbamate with a second alcohol in the presence of a dialkyl isocyanato alkoxy tin catalyst or derivatives in a carbonate reactor at a temperature and pressure sufficient to convert the alkyl carbamate to a dialkyl carbonate, wherein the molar ratio of alkyl carbamate to second alcohol is in the range between about 2:1 to about 10:1 and wherein dialkyl carbonate is present within the carbonate reactor in an amount between about 1 to about 3 weight %, based on total alkyl carbamate and second alcohol content, and wherein the second alcohol is either the same as or different from the first alcohol or a mixture of alcohols.

Process for manufacturing dialkyl carbonate from urea and alcohol

Dialkyl isocyanato tin alcoholate catalysts and dimers thereof

A process for making a catalyst product which comprises reacting dialkyltin oxide with an alcohol and the corresponding dialkyl carbonate at a temperature in the range between about 50.degree. to 200.degree. C. and at a pressure in the range between about 75 to 600 psi (0.52 to 4.14 MPa), wherein the catalyst product comprises dialkyltin dialkoxide in the range between about 90 to 100 mole % based on the tin species of the catalyst product. This process also forms effective catalyst product when the methanol is replaced with either a primary or secondary alcohol.

Process for the preparation of dialkyltin dialkoxide

A process for preparing a zeolite, e.g. ZSM-5, under controlled conditions of pH adjustment with an acid; SiO.sub.2 /Al.sub.2 O.sub.3 mole ratio, and in the substantial absence of alkali metal cations, is disclosed, as well as a process for using the same to synthesize olefins from methanol and/or dimethyl ether.

Process for synthesizing a zeolite catalyst on a pH controlled sodium

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Ridgewood, NJ, United States of America

Elena N Suciu