N-paraffin - isoparaffin separation process

Details N-paraffin - isoparaffin separation process N-paraffin - isoparaffin separation process

C - Chemistry, Metallurgy

07

C

183/28

C07C 7/13 (2006.01) B01D 53/04 (2006.01) C10G 25/03 (2006.01)

Patent

CA 1124187

D-12129 n-PARAFFIN - ISOPARAFFIN SEPARATION PROCESS ABSTRACT OF DISCLOSURE 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 com- prising at least four fixed adsorption bed 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 im- provement of the present process comprises recycling in the vapor phase in combination with feedstock the mixture of iso- paraffin and normal paraffins purged from one bed of the system during stage (c) to another bed of the system under- going 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. S P E C I F I C A T I O N - 1 -

323869

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