Separation of C3H8 and C3H6 from Butyl Alcohol–Octyl Alcohol Vent Gas Mixture via Hydrate Formation in the Presence of SDS and THF in Tap-Water System

Abstract

We used a new hydrate separation method to recover C3H8 and C3H6 (C3) from a butyl alcohol–octyl alcohol vent gas (BVG) mixture. The formation conditions of the BVG hydrate, which are crucial for the separating and operating conditions of C3 recovery by hydrate formation, were measured by pressure search method at varied temperature. Then, the separation experiment was performed in a tap-water system at 274.15 K, and C3 was recovered via hydrate formation in the presence of tetrahydrofuran (THF) and sodium dodecyl sulfate (SDS). The influences of experimental pressure and temperature on separation results were investigated. The total concentration of C3 in the hydrated gas was 84.40 mol %, and the total recovery yield exceeded 80%. Therefore, the recovery of C3 components from the BVG mixture through hydrate formation at a low pressure is a feasible strategy.