Patent ID: 6315968
Filing Date: 2001-11-13
Classification: B01D,C01B,C07C

Abstract:
A process for separating acid gas from a gaseous mixture containing acid gas and at least one non-acid gas, the process comprising contacting the gaseous mixture with a multilayer composite membrane comprising a first polymeric support layer and an active separating layer comprising a blend of a water soluble polymer and one-half equivalent or more of an acid gas reactive salt based upon the repeating unit of the water soluble polymer, the acid gas reactive salt which is represented by the formula A.sub.x B.sub.y.nH.sub.2 O wherein A is a monovalent cation and B is a monovalent anion wherein x and y are integers such that the salt remains charge neutral, n represents the number of moles of bound water per mole of salt, and the pKa of the conjugate acid of the monovalent anion is greater than 3, wherein the multilayer composite membrane separates the acid gas from the gaseous mixture by selectively permeating the acid gas.