Constant pressure separation of normal paraffins from hydrocarbo

Mineral oils: processes and products – Fractionation – Adsorption

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585826, C25G 2503

Patent

active

043740227

ABSTRACT:
Normal paraffins are separated from a hydrocarbon vapor feedstream having 10 to 25 carbon atoms per molecule in a constant pressure process employing a molecular sieve adsorbent and n-hexane for purging and for dilution of gas oil - containing feedstocks. A portion of the countercurrent, desorption purge effluent is employed as a hexane - containing cocurrent purge stream, thereby significantly reducing the required amount of n-hexane purge recycle material, and the size of the equipment and the energy consumed in the processing of said recycle stream. A portion of said countercurrent purge effluent can also be used to provide a source of n-hexane diluent for the gas oil - containing feedstocks, as can the cocurrent purge effluent, resulting in further reduction in required equipment and energy costs, and increasing adsorption efficiency and adsorbent utilization.

REFERENCES:
patent: 3284346 (1966-11-01), Anstey
patent: 3291725 (1966-12-01), Brodbeck
patent: 3342726 (1967-09-01), Mowll et al.
patent: 3422005 (1969-01-01), Avery
patent: 3770621 (1973-11-01), Collins et al.
patent: 4176053 (1979-11-01), Holcombe

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