초록 ▼

A process for the separation of isobutane from an alkylation reaction zone hydrocarbon effluent stream comprising isobutane, n-butane, propane and alkylate is disclosed. The hydrocarbon effluent stream is charged to an isostripper column. An isobutane vapor stream from the column is condensed in ind

A process for the separation of isobutane from an alkylation reaction zone hydrocarbon effluent stream comprising isobutane, n-butane, propane and alkylate is disclosed. The hydrocarbon effluent stream is charged to an isostripper column. An isobutane vapor stream from the column is condensed in indirect heat exchange with the lower liquid stream from said column comprising n-butane. The lower liquid stream is flashed in indirect heat exchange with said vapor stream at conditions to provide a vapor phase, said vapor phase being compressed and recycled to said column at a temperature to promote vapor formation therein.

대표청구항 ▼

A process for the separation of isobutane from an alkylation reaction zone hydrocarbon effluent stream comprising said isobutane, n-butane, propane and alkylate, which comprises the steps of: (a) passing said effluent stream into a fractionation column operated at fractionation conditions; (b) separ

A process for the separation of isobutane from an alkylation reaction zone hydrocarbon effluent stream comprising said isobutane, n-butane, propane and alkylate, which comprises the steps of: (a) passing said effluent stream into a fractionation column operated at fractionation conditions; (b) separating said propane as an overhead vapor stream; (c) withdrawing an isobutane vapor stream from said column as an upper intermediate fraction, at least partially condensing said vapor stream by indirect heat exchange with a lower intermediate fraction withdrawn from said column pursuant to step (d), and recovering said isobutane stream; (d) withdrawing a liquid stream comprising n-butane from said column as said lower intermediate fraction, effecting a reduction in pressure and temperature of said stream, and flashing said stream by indirect heat exchange with said upper intermediate fraction pursuant to step (c); (e) separating and compressing the resulting vapor phase to form a recycle stream having a temperature and pressure substantially equivalent to the lower intermediate fraction as withdrawn from said column, and introducing said recycle stream into a lower portion of said column at a point above the level of withdrawl of said lower intermediate fraction; (f) recovering the liquid phase of said mixed phase stream, heating said liquid phase by indirect heat exchange with the alkylate product stream withdrawn as the bottoms fraction with said column, and recycling said liquid phase from said column to the lower portion of said column at a point below the level of withdrawl of said lower intermediate fraction.