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US 9,789,463 B2Granted
Heat transfer in a polymerization reactor
AssigneeChevron Phillips Chemical Company LP
InventorsScott E. Kufeld, Joel A. Mutchler, John D. Hottovy
Life of this patent
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Abstract
A process comprises polymerizing an olefin monomer in a loop reactor in the presence of a catalyst and a diluent, and producing a slurry comprising solid particulate olefin polymer and diluent. The Biot number is maintained at or below about 3.0 within the loop reactor during the polymerizing process. The slurry in the loop reactor forms a slurry film having a film coefficient along an inner surface of the reactor wall, and the film coefficient is less than about 500 BTU·hr−1·ft−2·° F.−1.
Claims16
A process comprising:
- polymerizing an olefin monomer in a loop reactor in the presence of a catalyst and a diluent;
- and
- producing a slurry comprising solid particulate olefin polymer and diluent, wherein the Biot number is maintained at or below 3.0 within the loop reactor during the polymerizing, wherein the slurry in the loop reactor forms a slurry film having a film coefficient along an inner surface of a reactor wall, and wherein the film coefficient is less than 500 BTU·hr−1·ft−2·° F.−1.
A process comprising:
- polymerizing an olefin monomer in a loop reactor in the presence of a catalyst and a diluent, wherein the loop reactor comprises a continuous tubular shell;
- producing a slurry comprising solid particulate olefin polymer and diluent, wherein the slurry in the loop reactor forms a slurry film along an inner surface of the shell, and wherein a ratio of a heat transfer resistance through the slurry film to a heat transfer resistance through the tubular shell is maintained at or below 3.0 within the loop reactor during the polymerizing;
- and
- circulating the slurry in the loop reactor, wherein the slurry has a velocity of greater than 30 ft/s during the circulating.
1 more element
Dependencies are inferred from the claim text.