Process for preparing oligomeric glycol esters of...

Details Process for preparing oligomeric glycol esters of... Process for preparing oligomeric glycol esters of...

C - Chemistry, Metallurgy

07

C

260/473.1, 260/4

C07C 69/34 (2006.01) C07C 69/82 (2006.01) C08G 63/78 (2006.01)

Patent

CA 1265527

ABSTRACT The invention provides a process for the preparation of a polyester oligomer capable of being further polymerized to a high polymer wherein a glycol-dicarboxylic acid ester feed is treated in a secondary esterification zone under conditions such that the partial vapor pressures of water and glycol are maintained at a cumulative level of less than 740 Torr, with water and glycol vapors being continuously removed from the secondary esteri- fication zone, and free glycol being added to the secondary esterification zone in an amount sufficient to maintain a stable amount of liquid glycol in the secondary esterification zone. In various preferred embodiments of the invention, the secondary esterification zone can be maintained at a pressure substantially below atmospheric and the vapors from secondary esterification can be passed to a reflux column wherein glycol is condensed and returned to the secondary esterification zone, or the secondary esterification can be maintained at a pressure of about atmos- pheric and an inert gas can be injected into the vapor space thereby lowering the partial vapor pressures of water and glycol.

533298

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