Catalyst having a trilobal geometry for preparing polytetrahydrofuran
AssigneeBASF SE
InventorsVeronika Wloka, Thomas Heidemann, Ines Lottenburger
Life of this patent
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Abstract
A process makes polytetrahydrofuran, polytetrahydrofuran copolymers, or the mono- or diesters thereof by polymerizing tetrahydrofuran and any comonomers over shaped catalyst bodies. The catalyst bodies include an acid-activated sheet silicate, where the shaped catalyst bodies have the shape of trilobes. A cross section of the trilobes is bounded by three convex curves that each make contact with a circle of diameter d that circumscribes the cross section and have three points of intersection within said circle. A distance a from any two points of intersection is 0.5 to 0.65 times the diameter d of the circle that circumscribes the cross section.
Claims17
1-15. (canceled)
A process for producing polytetrahydrofuran, polytetrahydrofuran copolymers or the mono- or diesters thereof, comprising:
- polymerizing tetrahydrofuran and any comonomers over shaped catalyst bodies comprising an acid-activated sheet silicate, wherein the shaped catalyst bodies have a shape of trilobes, wherein a cross section of the trilobes is bounded by three convex curves that each make contact with a circle of diameter d that circumscribes the cross section and have three points of intersection within said circle, where a distance a from any two points of intersection is 0.5 to 0.65 times the diameter d of the circle that circumscribes the cross section, and the diameter d of the circle that circumscribes the cross section is 2 to 5 mm.
A shaped catalyst body, comprising:
- an acid-activated sheet silicate in a form of trilobes, wherein a cross section of the trilobes is bounded by three convex curves that each make contact with a circle of diameter d that circumscribes the cross section and have three points of intersection within said circle, where a distance a from any two points of intersection is 0.5 to 0.65 times the diameter d of the circle that circumscribes the cross section, and the diameter d of the circle that circumscribes the cross section is 2 to 5 mm.
Dependencies are inferred from the claim text.