Pressure swing adsorption cycles for improved solvent vapor enrichment

Solid–Vapor Sorption of Xylenes: Prioritized Selectivity as a Means of Separating All Three Isomers Using a Single Substrate

“…The proof of concept demonstrated herein should be amenable to applications involving pressure-swing adsorption technology, modified for solvent vapor recovery (PSA-SVR operating at low pressure, for example, 0.2-0.5 atm), [18] whereby a single solventless process can be implemented, in principle, to effect complete separation of three or more isomers. The proof of concept demonstrated herein should be amenable to applications involving pressure-swing adsorption technology, modified for solvent vapor recovery (PSA-SVR operating at low pressure, for example, 0.2-0.5 atm), [18] whereby a single solventless process can be implemented, in principle, to effect complete separation of three or more isomers.…”

“…Conceptually, this implies that in cases where there is a large difference in selectivity x for three guests A, B, and C such that x A @ x B @ x C , then it is possible to utilize a single procedure (even the same device) to first separate A from B and C, and then to repeat the process to separate B and C. This is important for implementing separation technologies in commercial applications where such selectivity is required, as is indeed the case for xylenes. The proof of concept demonstrated herein should be amenable to applications involving pressure-swing adsorption technology, modified for solvent vapor recovery (PSA-SVR operating at low pressure, for example, 0.2-0.5 atm), [18] whereby a single solventless process can be implemented, in principle, to effect complete separation of three or more isomers. Previously reported methods of separating xylenes using Werner clathrates were not industrially viable [19] because they required dissolution, crystallization and solvent extraction; each of these steps reduces the yield and increases the cost of the process.…”

Effects of Adsorbent Characteristics on Adiabatic Vacuum Swing Adsorption Processes for Solvent Vapor Recovery

“…This study was conducted by simulating various adiabatic VSA-SVR processes using the mathematical model described in the previous section and a rigorous PSA and VSA process simulator [19]. The initial conditions considered in the simulations are listed in Tab.…”

Dual Reflux PSA Process Applied to VOC Recovery as Liquid Condensate

“…Pressure Swing Adsorption (PSA) has been widely utilized for purification and separation of gases by developing various kinds of processes. In recent years PSA has been applied to solvent elimination (Liu et al, 2000) and its demand has increased from viewpoints of compact apparatus, economical energy and so on. To separate and recover very low concentration organic vapor we propose here a new Dual Reflux PSA (DR-PSA) process accompanied with liquid condensation.…”