Exxon Chemical Patents, Inc.

Ralph Donald Gray, Jr

Richard Henry Schlosberg

Walter Weissman

Richard S Polizzotti

John E Johnston

Larry O Jones

James J Baiel

Magdiel Agosto

Patrick Edward Godici

Lawrence Harold Kaplan

Gerald Dennis Dupre'

Maciej Radosz

A process for recovering phthalic anhydride as a liquid from a vapor phase oxidation product which comprises mixing the vapor phase oxidation product having a temperature of about 130.degree. C. or greater with a first stream comprising a solvent having a boiling point in the range between about 150.degree. to 350.degree. C. and a freezing point of less than 40.degree. C., and, optionally, at least one by-product selected from the group consisting of: maleic anhydride, citraconic anhydride, benzoic acid and phthalic anhydride, in a contacting means such that a substantial portion of the phthalic anhydride contained within the vapor phase oxidation product transfers from the vapor phase to a liquid phase and a substantial portion of the first stream which are more volatile than phthalic anhydride transfer from the liquid phase to the vapor phase and wherein a vapor-to-liquid weight ratio in the range between about 2 to 20 is exhibited within the contacting means, thereby forming a liquid phase phthalic anhydride product having a phthalic anhydride concentration in the range between about 50-100 wt. %., preferably 90-100 wt. %, without the formation of an intermediate solid phase.

Solvent assisted process for recovery of phthalic anhydride in the

A low emissions, high oxidative stability crankcase lubricating oil formulation which is prepared from a base stock which comprises at least one synthetic ester selected from the group consisting of: polyol esters, synthetic esters having between 5-35% unconverted hydroxyl groups, based on the total amount of hydroxyl groups in the polyol, and synthetic esters combined with at least one additional functional group which is capable of increasing the polarity of the functionalized synthetic ester, wherein the base stock has an oxygen, nitrogen or halogen content of at least 15 wt. %, based on the total weight of the base stock; and a lubricant additive package.

Synthetic ester base stocks for low emission lubricants

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Morristown, NJ, United States of America

Ralph Donald Gray, Jr