Modeling of a PSA-TSA Process for Separation of CH₄ from C₂ Products of OCM Reaction

Abstract

Computational modeling of C₂H₆–C₂H₄ adsorption separation from CH₄ onto CaX zeolite is discussed. Dynamic adsorption is studied to derive mass transfer parameters of the components. A two-bed and four-step PSA-TSA is introduced and sensitivity analysis is performed to approach to the higher products’ purity and recovery. CH₄-countercurrent pressurization, as the preferred method and optimum purge/ feed of 0.49 are determined for the light (CH₄) and heavy products (C₂s) recovery of 84% and 96%, with a purity of 95% and 72%, respectively. The effect of desorption temperature and heat transfer coefficient are studied to determine the temperature variation effect on the process performance.

Keywords:

• adsorption
• mathematical modeling
• OCM reaction
• PSA-TSA
• zeolites

Notes

*Base run.

^a Pressurization method.

^b Countercurrent.

^c Co-current.