Separation of multicomponent gas mixtures by pressure swing adsorption

摘要

Separation of multicomponent gas mixtures by pressure swing adsorption. The multicomponent mixtures contain a primary and a secondary key component and a tertiary component which is present in a concentration less than either the primary or secondary key component and which is more strongly sorbed than both these key components. The selective adiabatic pressure swing cyclic adsorption system, for me separate recovery of high purity primary and secondary ary components, comprises different steps applicable to the various adsorption trains, each containing a vessel A and a vessel B. These different steps are:(1) adsorption (both vessels A and B);2) high pressure rinse (vessel B). pressure equalization and repressurzation (vessel A);(3) depressurization (vessel B), purge (vessel A);4) evacuation (vessel B), optional purge (vessel A);(5) ^re^pressurization (vessel B), pressur equalization and rep- ressurization (vessel A).;An example is the treatment of effluent gas from a hyd- odesutphurzation plant after removal of the sulphur, wherein hydrogen (primary key component) and methane secondary key component) are separately recovered and submamially freed of C, + hydrocarbons (tertiary compo- nentlpresent in such effluent gas.