Purification of fluid mixtures by a thermal swing adsorption rec

Details Purification of fluid mixtures by a thermal swing adsorption rec Purification of fluid mixtures by a thermal swing adsorption rec

1989-10-13

1992-03-10

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210690, B01D 1500

Patent

active

050947559

ABSTRACT:
A continuous cyclic thermal swing adsorption process for the regeneration of a fixed adsorption bed and the purification of an incoming feed liquid stream, with the utilization of at least one product recycle stream, the feed stream comprising a solvent containing at least one dissolved solute, the process comprising contacting a first feed liquid stream maintained at a first temperature, the first feed stream comprising a mixture of a recycled pure, product liquid stream and optionally, at least some of the incoming feed liquid stream, with an at least partially saturated fixed adsorption bed to thereby regenerate the fixed adsorption bed while removing an enriched product liquid stream from the fixed adsorption bed; recycling an effective amount of the enriched product liquid stream having a desired solute concentration to a first storage means; contacting a second feed liquid stream, the second feed stream comprising a mixture of the incoming feed liquid stream and the recycled enriched product liquid stream at second temperature lower than the first temperature, in the fixed adsorption bed to adsorb at least a substantial amount of the at least one dissolved solute, and removing a substantially pure product liquid stream from the fixed adsorption bed exit; recycling an effective amount of the purified product liquid stream having a desired, substantially pure solute concentration to a second storage means for a later regeneration of the fixed adsorption bed.

REFERENCES:
patent: 3531401 (1970-09-01), Crits
patent: 3542525 (1970-11-01), Pigford et al.
patent: 4293423 (1981-10-01), Kosaka et al.
patent: 4447329 (1984-05-01), Broughton
patent: 4528101 (1985-07-01), Burke et al.
patent: 4708804 (1987-11-01), Coltrinari
Rieke, R. D., "Cycling Zone Adsorption: Variable-Feed Mode of Operation", Separation Scinece and Technology, 19 (4 and 5), pp. 261--281, 1984.
Knaebel, K. S. et al., "Equilibrium and Dissipative Effects in Cycling Zone Adsorption", Ind. Eng. Chem. Fundam., vol. 22, No. 3 (1983) pp. 336-346.
Carta et al., "Periodic Countercurrent Operation of Sorption Processes Applied to Water Desalination with Thermally Regenerable Ion-Exchange Resins", paper presented at AIChE meeting (Nov. 1985).

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