Control system for the selective hydrogenation of acetylene pres

Details Control system for the selective hydrogenation of acetylene pres Control system for the selective hydrogenation of acetylene pres

1979-11-19

1980-12-23

Davis, Curtis R.

Chemistry of hydrocarbon compounds

Adding hydrogen to unsaturated bond of hydrocarbon, i.e.,...

Hydrocarbon is contaminant in desired hydrocarbon

422 62, 422108, 422110, 585263, C07C 503, C07C 508

Patent

active

042412307

ABSTRACT:
Acetylene contained in an ethylene product stream in minor amounts is selectively hydrogenated to ethylene in the presence of suitable catalysts in a two stage converter having a primary reactor stage providing hydrogenation of a portion of the acetylene present in the stream in series with a secondary reactor stage providing hydrogenation of substantially all of the remaining unreacted acetylene. Overall process control is achieved by adjusting the molar ratio of hydrogen to acetylene in the feed stream for the primary reactor stage in response to feedforward information from an analyzer for the primary stage feed stream and feedback information from an analyzer for the primary stage effluent stream to provide a primary stage effluent of substantially constant acetylene content. The substantially constant acetylene content of the primary reactor stage effluent allows operation of the secondary reactor stage to be optimized to provide for maximum ethylene recovery and a secondary stage stream effluent having a level of acetylene therein within desired process specifications.

REFERENCES:
patent: 2802889 (1957-08-01), Frevel et al.
patent: 2814653 (1957-11-01), Hogan et al.
patent: 3113980 (1963-12-01), Robinson
patent: 3153679 (1964-10-01), Rottmayr
patent: 3471582 (1969-10-01), Lupfer
patent: 3656911 (1972-04-01), Hobbs
patent: 3972804 (1976-08-01), McLaughlin et al.

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