Patent ID: 6200366
Filing Date: 2001-03-13
Classification: C07C,Y10S

Abstract:
A method of separating an alkene selected from ethene, propene, normal butenes or mixtures of these from a gas mixture comprising said alkene and an alkane selected from ethane, propane, butanes and mixtures of these by a pressure swing adsorption process comprising the steps:(a) passing said gas mixture through at least one adsorption zone containing type A zeolite having, as its exchangeable cations, about 55% to about 73% sodium ions, about 27% to about 40% potassium ions and about 0% to about 5% other ions selected from Group IA ions other than sodium and potassium, Group IB, Group IIA ions, Group IIIA ions, Group IIIB ions, lanthanide series ions and mixtures of these, thereby adsorbing at least part of said alkene from said gas mixture and producing an alkene-depleted gas; and(b) regenerating said zeolite, thereby producing an alkene-enriched gas.