Eastman Chemical Company

William Christopher Ketchie

Michael Paul Ekart

Matthew Allen Boone

Sumit Chakraborty

Leslie Sharon Depew

Noah Glenn McMillan

Travis Wynn Keever

Disclosed is a method for treating the product stream from a polyester methanolysis depolymerization process wherein the product stream includes dimethyl terephthalate and one or more side species selected from the group consisting of dimethyl phthalate, dimethyl isophthalate, bisphenol-A, an adipic acid diester and colorants. The method includes a) hydrogenating said dimethyl terephthalate to form one or more of dimethyl 1,4-cyclohexanedicarboxylate and 1,4-cyclohexanedimethanol; and (b) hydrogenating one or more of said one or more side species of said product stream. A method for depolymerization of polyester is also described.

Process for treating polyester methanolysis depolymerization product streams

A process for direct esterification of an alkyl aldehyde with an alkyl alcohol to produce an alkyl ester is disclosed. The process comprises reacting an alkyl aldehyde with an alkyl alcohol in the presence of an Au/TiOa catalyst, a base and an enal or oxygen to form an ester and an aldehyde. The process avoids liberation of water and avoids the step of oxidation of the alkyl aldehyde to an alkyl acid.

Ester synthesis using heterogeneous Au/TiO2 catalyst

We have discovered that a di-epoxide can be converted to a dialdehyde using an amorphous silica-alumina catalyst. The method comprises contacting a di-epoxide mixed in an organic solvent with a silica-alumina catalyst to form a solvent and dialdehyde reaction product mixture and separating said dialdehyde from said reaction mixture. The dialdehydes have utility as chemical intermediates, and particular utility in processes to make enol ether compounds which can be used in applications as plasticizers, diluents, wetting agents, coalescing aids and as intermediates in chemical processes.

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Kingsport, TN, United States of America

William Christopher Ketchie