Method for controlling removal of polymerization reaction effluent
AssigneePhillips Petroleum Company
InventorsDavid H. Burns, William E. Martin
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Abstract
In withdrawing a reaction slurry from a polymerization reactor wherein solid particles in the slurry must be maintained in solution to prevent solidification, a redundant effluent line is provided to remove the slurry in the event the primary line becomes plugged. In use the primary and redundant lines are controlled in different manners such that a v-notch ball valve in the primary line is manipulated continuously to remove effluent while maintaining stable reactor conditions, and a control valve in the redundant line is manipulated intermittently as a backup for the primary control valve.
Claims6
A method for controlling removal of a reaction slurry containing a polymer product from a polymerization reactor, wherein said reaction slurry is removed through a secondary reaction effluent conduit if a primary reaction effluent conduit becomes plugged with said polymer product, said method comprising the following steps:
- (a) operatively installing a v-notch ball valve in said primary removal conduit;
- (b) withdrawing said reaction slurry in a primary stream flowing in said primary removal conduit;
- (c) controlling the flow rate of said reaction slurry flowing in said primary stream in a continuous manner by manipulating said v-notch valve;
- and
- (d) automatically initiating withdrawal of said reaction slurry through a secondary stream flowing in said secondary reaction effluent conduit if said primary reaction effluent conduit becomes plugged with said reaction product.
Dependencies are inferred from the claim text.