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US 4,375,524 AGranted
Process control for flash concentrating solutions containing polyolefins
AssigneePhillips Petroleum Company
InventorFred Rowe
Life of this patent
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Abstract
Apparatus and methods are provided for controlling liquid levels in different vessels, and the blending of different materials in the separation and purification of polymeric materials in solution, such as polyethylene in cyclohexane.
Claims6
A method comprising
- (a) flashing a predominantly liquid stream having a first concentration of polymer in a flash zone to form an overhead stream comprising predominantly solvent;
- (b) pumping a predominantly liquid bottoms second stream having a second concentration of polymer from the flash zone;
- (c) mixing the second stream with a third predominantly liquid stream having a third concentration of polymer to form the first predominantly liquid stream;
- (d) establishing a first signal representative of the flow rate of the third stream;
- and
- (e) regulating the flow rate of the second stream in response to said first signal.
3 more elements
Dependencies are inferred from the claim text.