n-Paraffin - isoparaffin separation process

Details n-Paraffin - isoparaffin separation process n-Paraffin - isoparaffin separation process

1978-03-31

1979-11-27

Levine, Herbert

Mineral oils: processes and products

Fractionation

Adsorption

585822, 585825, C10G 2504

Patent

active

041760530

ABSTRACT:
Normal paraffins are isolated from a feedstock mixture of normal and non-normal paraffins in the vapor phase at superatmospheric pressure using an adsorption system comprising at least four fixed adsorption beds containing a 5 Angstrom molecular sieve adsorbent, each of which cyclically undergoes the stages of (a) adsorption-fill, (b) adsorption, (c) void space purging, and (d) purge desorption. The improvement of the present process comprises recycling in the vapor phase in combination with feedstock the mixture of isoparaffins and normal paraffins purged from one bed of the system during stage (c) to another bed of the system undergoing stage (b). In conventional practice the void space contained hydrocarbons purged from each bed during stage (c) was cooled, separated from the purging gas, pumped to a holding tank in the liquid phase and thereafter reheated to form the vapor phase before being admixed with fresh feedstock for further treatment.

REFERENCES:
patent: 3373103 (1968-03-01), Cooper et al.
patent: 3393097 (1968-07-01), Senn
patent: 3700589 (1972-10-01), Symoniak et al.

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