Selective Adsorption Systems

On lean well streams where economic justification and payout of the equipment necessary for hydrocarbon removal by refrigeration are not possible, a selective adsorption system should be considered. This type of system frequently will be competitive in hydrocarbon recovery with mechanical refrigeration for lean gas streams. Technical Data used in the field explained in petroleum courses in Islamabad.

The selective adsorption system consists basically of two or more adsorption towers filled with a solid material capable of adsorbing hydrocarbons. The towers are controlled on a time cycle to be adsorbing, regenerating, and/or cooling. Alternatively, the bed is used to adsorb the desired quantity of hydrocarbon from the gas stream.

When the bed becomes saturated with hydrocarbons, the gas stream is switched to another bed. The saturated bed then is regenerated by passing hot gas through the bed. The hot gas vaporizes and drives off the adsorbed hydrocarbons. During the regeneration cycle, the bed and some of the parts of the adsorbed become heated and must be cooled before the bed can again be used on an adsorbing cycle. Some more details of petroleum courses in Islamabad are as under.

The approach used in hydrocarbon adsorption is the same as is widely used in dry-desiccant dehydrators. The basic difference is in the time allowed for the adsorption cycle. Dehydrators normally operate on a 6-hour or longer cycle. Hydrocarbon recovery units operate on a  much shorter time cycle and for this reason are frequently called  “short-” or “quick-cycle” units.

The non hydrocarbons present in the natural gas will have some effect on the process. This is especially true of the water vapors that eventually replace the hydrocarbons adsorbed in the bed and allow them to be expelled. The short-cycle unit is an excellent dehydrator as well as a hydrocarbon-removal unit. Presence of Hz S has little effect on the process unless oxygen is present. In this event, the oxygen causes free sulfur to form which will tend to foul the desiccant. CO;!, nitrogen, and other gases occasionally found in natural gas do not affect the process significantly. TSK Training for Skills and Knowledge is the best institute in Rawalpindi Islamabad for Pakistani Students who wants to join petroleum courses in Rawalpindi.