Method for producing polytetrahydrofurane having a low color indices
AssigneeBASF SE
InventorsAnton Meier, Volkmar Menger, Christoph Sigwart
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Abstract
The invention provides a process for preparing polytetrahydrofuran, tetrahydrofuran copolymers, their monoesters or diesters and the monoesters or diesters of polytetrahydrofuran having a low color number in the presence of a catalyst, which comprises converting crude tetrahydrofuran which has been prepared in a manner per se into pure tetrahydrofuran by distillation, subsequently subjecting the latter to essentially complete hydrogenation and using the high-purity tetrahydrofuran obtained in this way for the polymerization directly after its preparation.
Claims5
A process for preparing polytetrahydrofuran, tetrahydrofuran copolymers, their monoesters or diesters and the monoesters or diesters of polytetrahydrofuran having a low color number in the presence of a catalyst, which comprises converting crude tetrahydrofuran which has been prepared in a manner known per se into pure tetrahydrofuran by distillation, subsequently subjecting the latter to essentially complete hydrogenation over a catalyst comprising transition metals of groups 7 to 10 of the Periodic Table of the Elements or oxides thereof on a support selected from among aluminium oxide, silicon oxide, pumice, bentonite, magnesium silicate and mixtures thereof and using the high-purity tetrahydrofuran obtained in this way for the polymerization directly after its preparation.
Dependencies are inferred from the claim text.