Vacuum swing adsorption for propylene/propane separation with 4A zeolite

A vacuum swing adsorption process using 4A zeolite pellets with five steps was designed to split an equimolar mixture of propylene/propane. The equimo lar feed of C-3 is diluted to 50% with nitrogen at 5 bar and 423 K, and the product is obtained when the total pressure is lowered to 0.1 bar. After 1 5 cycles, cyclic steady-state conditions are reached, a propylene-enriched stream of 97 mol% relative to the propylene/propane mixture, with 4.4% of n itrogen, a recovery of 26% (molar basis), and a productivity of 1.03 mol/(k g h) are obtained. The experimental work is compared with numerical simulat ions, and the effects of different operating parameters on the VSA process are analyzed.