Process for alkane isomerization using reactive chromatography a

Details Process for alkane isomerization using reactive chromatography a Process for alkane isomerization using reactive chromatography a

1996-06-18

1998-04-28

Myers, Helane

Chemistry of hydrocarbon compounds

Saturated compound synthesis

By isomerization

585702, 585734, 585736, 585738, 585739, 585741, 585744, 585746, 585748, 585750, 585825, C07C 522

Patent

active

057446849

ABSTRACT:
A process for isomerizing a mixture of alkanes containing pentanes and at least one alkane having from 6 to about 8 carbon atoms and no more than one methyl branch has been developed. The process includes: 1) separating the mixture in a first separation zone to produce two streams, a stream enriched in alkanes having from 6 to about 8 carbon atoms and a stream enriched in pentanes; 2) separating the stream enriched in pentanes in a second separation zone to produce two streams, a stream predominately comprising n-pentane and a stream predominately comprising branched pentanes; 3) passing the stream enriched in alkanes having from 6 to about 8 carbon atoms and the stream enriched in n-pentane to an isomerization zone of a simulated moving bed to produce two streams, a stream containing branched pentanes, n-pentane, and multi-methyl-branched alkanes having from 6 to about 8 carbon atoms, and a stream containing branched pentanes and n-pentane; 4) separating the stream containing branched pentanes, n-pentane, and multi-methyl-branched alkanes having from 6 to about 8 carbon atoms in a third separation zone to produce two streams, a stream enriched in multi-methyl-branched alkanes having from 6 to about 8 carbon atoms and a stream enriched in branched pentanes and n-pentane; and 5) collecting the stream predominately comprising branched pentanes from the second separation zone and the stream enriched in multi-methyl-branched alkanes having from 6 to about 8 carbon atoms from the third separation zone.
The catalyst used in the simulated moving bed may be platinum on tungstated zirconia and the adsorbent used in the simulated moving bed may be one or more of the following adsorbents, zeolite beta exchanged with sodium, lithium, potassium, barium, calcium, strontium or combinations thereof, zeolite X exchanged with calcium and strontium, mordenite exchanged with sodium, lithium, potassium, barium, calcium, strontium, or combinations thereof, EU-1, ZSM-12, SAPO-5, Y-82, faujasite and erionite.

REFERENCES:
patent: 5530173 (1996-06-01), Funk et al.

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