Catalyst and method for producing polytetrahydrofuran
AssigneeBASF SE
InventorsKarsten Eller, Heinz Rütter, Michael Hesse, Rainer Becker
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Abstract
In a process for preparing polytetrahydrofuran, polytetrahydrofuran copolymers or diesters or monoesters thereof by polymerization of tetrahydrofuran in the presence of at least one telogen and/or comonomer over acid-activated montmorillonite catalysts, the montmorillonite catalyst after acid activation has a ratio of montmorillonite structure to the sum of muscovite and kaolin structures, determined from the intensities of the reflections at 2θ=5.5° for montmorillonite, 2θ=9.0° for muscovite and 2θ=12.5° for kaolin measured in the X-ray powder pattern, of at least 5:1.
Claims9
A process for preparing polytetrahydrofuran, polytetrahydrofuran copolymers or diesters or monoesters thereof by polymerization of tetrahydrofuran in the presence of at least one telogen and/or comonomer selected from water, 1,4-butanediol, 2-butyne-1,4-diol, polytetrahydrofuran having a molecular weight of from 200 to 700, a C1-C20-monocarboxylic acid, a carboxylic anhydride of a C2-C20-monocarboxylic acid, 2- or 3-methyltetrahydrofuran, a diol or a mixture of these telogens and/or comonomers over acid-activated montmorillonite catalysts, wherein the montmorillonite catalyst after acid activation has a ratio of montmorillonite structure to the sum of muscovite and kaolin structures, determined from the intensities of the reflections at 2θ=5.5° for montmorillonite, 2θ=9.0° for muscovite and 2θ=12.5° for kaolin measured in the X-ray powder pattern, of at least 5:1.
Dependencies are inferred from the claim text.