Improving the Technological Scheme of Isolation of Butane–Butylene Fraction by Chemisorption Using Tubular Turbulent Apparatus

Abstract

The butadiene and butane–butylene fraction are products of separation of the butylene–butadiene fraction (BBF) by chemisorption. Butadiene is a diene monomer for the production of elastomers and plastics. The butane–butylene fraction is used as a feedstock for various petrochemical processes, in particular, for the preparation of C₄ oligomeric products and methyl tert-butyl ether. A residual content of butadiene in the butane–butylene fraction of more than 0.5 wt % has a negative effect when it is used as a raw material for petrochemical processes; it also reduces the yield of butadiene. The article describes the method of purification of the butane–butylene fraction from butadiene by returning the part of butane–butylene fraction mixed with a stream of absorption ammonium–copper solution in the form of reflux in the chemisorption column. Mixing of flows is carried out in a tubular turbulent apparatus mounted in a reflux line. The organization of an additional contact of part of butane–butylene fraction with copper ammonia solution will increase the sorption efficiency of the column.