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Processing of high normal paraffin concentration naphtha feedstocks

Patent ·
OSTI ID:5512247
;

An isobaric process is described for separating normal paraffins from non-normal hydrocarbons in a vapor feed stream by (1) concurrent purge/adsorption with the selective adsorption of normal paraffins by passage of the feed gas streams to the feed end of an adsorbent bed in a system having four or more beds, with unadsorbed non-normal hydrocarbons displacing residual purge gas from the effluent end of the bed, (2) cocurrent feed/adsorption with additional quantities of the feed gas mixed with purge effluent from the next succeeding countercurrent purge step (3) being passed to the feed end of the bed, thereby advancing and adsorption front of adsorbed normal paraffins toward the effluent end of the bed, thus displacing non-normal hydrocarbons from the effluent end of the bed for recovery as a co-product stream, (3) countercurrent purge with a stripping gas being introduced to the effluent end of the bed and purge effluent comprising striping gas, residual unadsorbed non-paraffins and some desorbed normal paraffins being withdrawn from the feed end of the bed and recycled for mixture with feed gas to the bottom of a bed in the system, and (4) countercurrent displacement with the introduction of stripping gas to the top of the bed and the withdrawal of normal paraffins, together with stripping gas, as a product stream from the bottom of the bed.

Assignee:
Union Carbide Corp., Danbury, CT
Patent Number(s):
US 4595490
OSTI ID:
5512247
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ADSORBENTS
ADSORPTION
ALKANES
COAL TAR OILS
DEWAXING
DISTILLATES
ENERGY SOURCES
FLUID FLOW
FLUIDS
FOSSIL FUELS
FUELS
GAS FLOW
GASES
HYDROCARBONS
MIXERS
NAPHTHA
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM
PETROLEUM DISTILLATES
PETROLEUM FRACTIONS
QUANTITY RATIO
SEPARATION EQUIPMENT
SEPARATION PROCESSES
SORPTION
VAPORS