Process for the start-up of a Fischer-Tropsch reactor

Details Process for the start-up of a Fischer-Tropsch reactor Process for the start-up of a Fischer-Tropsch reactor

1986-01-06

1986-12-02

Mars, Howard T.

Chemistry: fischer-tropsch processes; or purification or recover

Temperature control or regulation of the fischer-tropsch...

518706, 518728, C07C 104

Patent

active

046265520

ABSTRACT:
A process for the start-up of a reactor which utilizes a feed comprising hydrogen and carbon monoxide for the synthesis of hydrocarbons. The feed is contacted with a bed of hydrocarbon synthesis catalyst in which perturbations of the temperature profile across the bed can develop, and which, at start-up is particularly acute. In practicing the process the feed is introduced into the reactor at a rate ranging up to about 100 percent of the total flow rate at which the feed is introduced to the reactor at line-out. Hydrogen is introduced into the reactor as a portion of said feed at a molar feed rate generally well below the feed rate in which the hydrogen is employed in the reactor at line-out, the molar ratio of hydrogen:carbon monoxide of the feed generally not exceeding about 90 percent, preferably 75 percent, of the molar ratio of hydrogen:carbon monoxide at line-out. While maintaining the low molar ratio of hydrogen:carbon monoxide in the feed, the pressure and temperature of the reactor is raised to levels of pressure and temperature, respectively, employed at line-out. Thereafter the molar ratio of hydrogen:carbon monoxide is raised until the molar ratio of hydrogen:carbon monoxide is essentially that employed at line-out. The thermal stability of the operation is greatly improved, and by conducting start-up in this manner the conventional time period required for start-up can be drastically reduced, e.g., from an 8 to 18 day start-up period for a small reactor to as little as about 20 hours, or less.

REFERENCES:
patent: 2847438 (1958-08-01), Sumerford et al.

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