Method of removing lithium compounds from a polymer
AssigneeShell Oil Company
InventorsStephen N. Massie, Jaroslav G. Balas, Loralee A. Logan
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Abstract
A process for separating an alkali metal or alkali metal compound from a polymer comprising a conjugated diolefin and/or an alkenyl aromatic hydrocarbon monomer wherein a polymer and one or more alkali metal compounds is contacted with a suitable solid adsorbent. Preferably, the solid adsorbent will be selected from the group consisting of alumina, silica-alumina, silica and mixtures thereof.
Claims17
A process for separating certain alkali metal compounds from a solution of a polymer comprising a conjugated diolefin and/or an alkenyl aromatic hydrocarbon monomer, said polymer containing one or more alkali metal compounds, comprising the steps of:
- (a) contacting the polymer solution with a suitable solid adsorbent selected from the group consisting of alumina, silica alumina, silica and mixtures thereof, wherein 10 to 100% of the pour volume of the solid adsorbent is occupied by water;
- (b) separating the solid adsorbent from the polymer solution;
- and
- (c) recovering the polymer containing a reduced amount of alkali metal compounds.
Dependencies are inferred from the claim text.