Process for continuously producing polyester and spun fiber

Details Process for continuously producing polyester and spun fiber Process for continuously producing polyester and spun fiber

C - Chemistry, Metallurgy

08

G

402/208, 18/622

C08G 63/16 (2006.01) D01D 1/00 (2006.01)

Patent

CA 1120639

ABSTRACT OF TIIE DISCLOSURE In a process for continuously producing polyester which comprises continuously polymerizing bis-.beta.-hydroxyethyl tereph- thalate and/or a lower polymer thereof using a plurality of vacuum polymerization reactors equipped with a stirrer disposed in series, the improvement which comprises automatically and continuously measuring stirring power or stirring axis reaction force of at least the final polymerization reactor among the polymerization reactors from which a polymer having a limiting viscosity (n) of 0.25 or more is removed, and controlling the vacuum in the polymerization reactors based on changes in the stirring power or reaction force so that the stirring power or reaction force is kept at a prescribed level, by which the degree of polymerization of the polymer removed from the poly- merization reactors is controlled. A process for producing a polyester spun fiber is also disclosed.

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