Method of removing a polymerization catalyst

Details Method of removing a polymerization catalyst Method of removing a polymerization catalyst

1991-10-30

1993-01-05

McFarlane, Anthony

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By contact with solid sorbent

585855, 585868, 528488, 528490, C07C 712, C07C 700, C08F 600

Patent

active

051772973

ABSTRACT:
A process for separating lithium from a conjugated diolefin polymer wherein a solution containing said conjugated diolefin polymer and a lithium compound is contacted with magnesium phosphate, magnesium phosphate dibasic, magnesium dihydrogen phosphate or a mixture thereof. Preferably, the magnesium phosphate compound is selected from the group consisting of mono- and dihydrogen phosphates. Most preferably, the magnesium phosphate is magnesium phosphate dibasic. The magnesium phosphate, magnesium phosphate dibasic, magnesium phosphate or mixture thereof may be used in combination with water and/or methanol with relatively good results. The lithium, which is a polymerization catalyst, can be removed immediately after the conjugated diolefin polymer is prepared by contacting the polymer solution with the magnesium phosphate compound.

REFERENCES:
patent: 4855509 (1989-08-01), Dave et al.
patent: 5104972 (1992-04-01), Madgavlsav et al.

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