Anion-exchange resin-based desulfurization process. Final report

Technical Report · Sat Jan 01 00:00:00 EST 1994

DOI:https://doi.org/10.2172/10135310· OSTI ID:10135310

Sheth, A C; Dharmapurikar, R; Strevel, S D

The following investigations were performed: (1) batch mode screening of eleven(11) commercially available resins and selection of three candidate resins for further evaluation in a fixed-bed setup. (2) Process variables study using three candidate resins in the fixed-bed setup and selection of the ``best`` resin for process economics development. (3) Exhaustion efficiency and solution concentration were found to be inversely related necessitating a trade-off between the resin cost versus the cost of evaporation/concentration of ensuing effluents. (4) Higher concentration of the HCO{sub 3}{sup {minus}} form of active sites over less active CO{sub 3}{sup 2{minus}} form of sites in the resin was believed to be the main reason for the observed increase in the equilibrium capacity of the resin at an elevated static CO{sub 2}-pressure. This Increase in capacity was found to level off around 80--120 psig range. The increase in CO{sub 2}-pressure, however, did not appear to affect the overall ion-exchange kinetics. (5) In the fixed-bed mode, the solution concentration was found to affect the equilibrium capacity of candidate resins. Their relationship was well satisfied by the Langmuir type non-linear equilibrium isotherm. Alternatively, the effect of solution concentration on overall ion-exchange kinetics varied from resin to resin. (6) Product inhibition effect on the resin was observed as an initial increase followed by a significant decrease in the resin`s equilibrium capacity for SO{sub 4}{sup 2{minus}} as the HCO{sub 3}{sup {minus}}/SO{sub 4}{sup 2{minus}} molar ratio in the solution was increased from 0 to 1.0. This ratio, however, did not affect the overall ion-exchange kinetics.

• Research Organization: Tennessee Univ., Tullahoma, TN (United States). Space Inst.
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-90PC90309
• OSTI ID: 10135310
• Report Number(s): DOE/PC/90309-13; ON: DE94008710; BR: AA1525050
• Resource Relation: Other Information: PBD: Jan 1994
• Country of Publication: United States
• Language: English

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