Partial hydrogenation of c4 acetylenes prior to caa prewash

Claim 1

A PROCESS FOR THE REMOVAL OF VINYL AND ALKYL ACETYLENES FROM A BUTADIENE-BEARING STREAM CONTAINING THESE COMPONENTS IN MINOR PROPORTIONS, WHICH COMPRISES SELECTIVELY HYDROGENATING SAID BUTADIENE-BEARING STREAM UNDER MILD CONDITIONS TO OBTAIN REMOVAL OF AT LEAST A MAJOR PORTION OF THE VINYL ACETYLENE AND ONLY A MINOR PROPORTOIN OF THE ALKYL ACETYLENES, CONTAINING THE HYDROGENATED BUTADIENE STREAM WITH THAT AMOUNT OF A CUPROUS AMMONIUM ACETATE SOLUTION TO OBTAIN A SELECTIVE EXTRACTION OF AT LEAST A MAJOR PORTION OF THE TOTAL ACETYLENES REMAINING IN THE HYDROCARBON STREAM WITHOUT EXTRACTING ANY SUBSTANTIAL AMOUNT OF THE BUTADIENE PRESENT THEREIN, SEPARATING A SPENT CAA SOLUTION CONTAINING ABSORBED ACETYLENES, STRIPPING THIS SPENT CAA SOLUTION TO REMOVE A SUBSTANIAL AMOUNT OF THE ACETYLENES, RECYCLING STRIPPED CAA SOLUTION TO THE EXTRACTION PROCESS AND RECOVERING AS A PRODUCT FROM THE PROCESS A BUTADIENE RAFFINATE STREAM HAVING A REDUCED TOTAL ACETYLENE CONTENT.