Polyolefin composition and use of same in alkaline solutions

In the process of separating weakly acidic gases selected from the group consisting of hydrogen sulfide, carbon dioxide and mixtures thereof from gaseous mixtures by contact with an aqueous potassium carbonate solution, the improvement comprising contacting said gaseous mixture with said carbonate solution in the presence of a contacting article comprising a solid polyolefin resin polymer of an alpha monoolefin having 2 to 8 carbon atoms in the molecule, having admixed therein a stearate radical unassociated with barium cation and an (antifoaming) amount of a (finely divided) water soluble barium compound (which forms) capable of forming sufficient water insoluble barium stearate soaps with said stearate radical after being (leaching) leached from said article by said alkaline solution and thus preventing (to prevent) foaming in said alkaline solution which would otherwise be caused by said stearate radicals unassociated with said barium cation.