| US 7,473,815 B2 | ||
| Process for removal of catalyst residues from poly-α-olefins | ||
| Timothy L. Lambert, Waterbury, Conn. (US); and Werner A. Thuring, Elmira (Canada) | ||
| Assigned to Crompton Corporation, Middlebury, Conn. (US) | ||
| Filed on Nov. 12, 2003, as Appl. No. 10/712,829. | ||
| Prior Publication US 2005/0101761 A1, May 12, 2005 | ||
| Int. Cl. C07C 7/12 (2006.01) | ||
| U.S. Cl. 585—809 [585/820; 585/833; 585/852; 585/853] | 18 Claims |
| 1. A method of reducing levels of residual halogen to from 70 to 206 parts per million and reducing levels of residual Group
IIIb metals to 0.1 or less parts per million in a liquid poly(α-olefin) polymerized in the presence of a catalyst comprising
the halogen and Group IIIb metals, wherein the method comprises:
A) washing the liquid poly (α-olefin) with water;
B) separating the aqueous and organic phases;
C) then adding from 0.78-1.0 eq. metal/eq. halogen of an adsorbent selected from the group consisting of magnesium silicates,
calcium silicates, aluminum silicates, aluminum oxides, and clays to the organic phase to form a slurry;
D) heating the slurry under a vacuum of at least 50 mmHg and at a temperature of at least about 180° C. for at least about
thirty minutes; and then
E) separating the adsorbent from the slurry.
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