Combination gas disengaging downcomer-rejuvenation tube for in-s

Details Combination gas disengaging downcomer-rejuvenation tube for in-s Combination gas disengaging downcomer-rejuvenation tube for in-s

1997-05-06

1998-09-22

Geist, Gary

Chemistry: fischer-tropsch processes; or purification or recover

Liquid phase fischer-tropsch reaction

422219, 422230, 422231, 502 21, 502 22, 502 20, 502 30, C07C 2700

Patent

active

058114688

ABSTRACT:
A reversibly deactivated, particulate catalyst in a hydrocarbon synthesis slurry is rejuvenated by circulating the slurry from a slurry body through (i) a gas disengaging zone to remove gas bubbles from the slurry and increase its density, (iii) a downcomer which feeds the gas reduced, dense slurry into the bottom of a rejuvenating tube and applies a positive hydrostatic pressure to the tube, (iii) a catalyst rejuvenation zone in which a catalyst rejuvenating gas, which also acts as a lift gas, contacts the catalyst in slurry to form a catalyst rejuvenated slurry and, (iv) back into the slurry body. Removing gas bubbles prior to rejuvenation improves the rejuvenation efficiency and the downcomer reduces the amount of rejuvenation gas required to maintain slurry circulation through the tube.

REFERENCES:
patent: 5260239 (1993-11-01), Hsia
patent: 5283216 (1994-02-01), Mitchell
patent: 5288673 (1994-02-01), Behrmann et al.
patent: 5382748 (1995-01-01), Behrmann et al.

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