a choke in which a conical needle and seat vary the rate of flow. adsorption the adhesion of a thin film of a gas or liquid to the surface of a solid. Liquid hydrocarbons are recovered from natural gas by passing the gas through activated charcoal, which extracts the heavier hydrocarbons. Steam treatment of the charcoal removes the adsorbed hydrocarbons, which are then collected and recondensed.
