Process for increasing the yield of an isomerization zone

摘要

A process for increasing a yield of an isomerization zone by removing at least a portion of the C6 cyclic hydrocarbons from a stream having iC4 hydrocarbons, iC5 hydrocarbons, and iC6 hydrocarbons prior to the stream being passed into the same isomerization zone. Suppression of the iC4 hydrocarbons does not occur, allowing the iC4 hydrocarbons to be isomerized in the same isomerization zone as the iC5 hydrocarbons and iC6 hydrocarbons.

主权项

1. A process for the isomerization of isoparaffins to normal paraffins, the process comprising:
separating a portion of C6 cyclic hydrocarbons from a naphtha stream comprising C4+ hydrocarbons to provide a C6 cyclic hydrocarbons lean stream; separating iC4 paraffinic hydrocarbons, iC5 paraffinic hydrocarbons, and iC6 paraffinic hydrocarbons from the C6 cyclic hydrocarbons lean stream; and, passing in iC4 paraffinic hydrocarbons, iC5 paraffinic hydrocarbons, and iC6 paraffinic hydrocarbons to an isomerization zone containing a chlorided alumina catalyst to isomerize isoparaffins to normal paraffins, disproportionate at least some isoparaffins, and crack at least some isoparaffins; and controlling an amount of C6 cyclic hydrocarbons passed into the isomerization zone by at least one of the following: selectively adding a stream of C6 cyclic hydrocarbons to the isomerization zone; and, controlling an operating parameter of a separation zone used to separate the C6 cyclic hydrocarbons from the naphtha stream.