Separation of propylene from the propane-propylene cracking fraction in a stationary layer of zeolite

Conclusions

• 1. It is possible to increase the concentration of propylene in the starting product significantly by means of synthetic CaA zeolite; in a single adsorption-desorption cycle the propylene concentration was increased from 37–40% to 89–90%.

• 2. The equilibrium static activity of the CaA zeolite with respect to propylene is about 6.4 and 7.0 g/g of adsorbent for starting propylene concentrations in the propane-propylene mixture of 38 and 45–46% by weight respectively.

• 3. An increase in the volume rate within the limits that were studied has no marked effect on the propylene concentration in the stationary layer of zeolite but makes it possible to reach the saturation of the zeolite by propylene 2–3 times faster.

• 4. The thermal desorption of propylene from the CaA zeolite is difficult; even at 400° C only 70–80% of the total amount adsorbed on the zeolite is desorbed.