Abstract:For the energy-saving hot carbonate process, which contains a crystallization step, the antisolvent precipitation of potassium bicarbonate was investigated by adding ethanol and 2-propanol in a simulated effluent solution of CO 2 absorption column. The feasibility of using the antisolvent was verified with the equilibrium data of ternary systems and a KHCO 3 recovery. The ternary systems of KHCO 3 + H 2 O + ethanol/2-propanol were equilibrated with varying amounts of alcohols at a preset temperature, and the e… Show more
“…We measured the amount of ethanol in the gas phase over solutions of 3 wt% ethanol in different liquidspure deionized water, KOH in water, carbonate salts in water (Figure S1, Table S2)deploying every time the same controlled conditions. We were not able to quantify the ethanol concentration in the gas phase for the 7 M KHCO 3 solution due to immediate crystallization upon addition of ethanol; however, for KOH and K 2 CO 3 solution samples, the effect of salting-out is surprisingly highthe concentration of ethanol in the vapor phase above 7 M KOH is 6 times higher than that above watersuggesting that a vapor–liquid equilibrium-driven approach (distillation) can yield an efficient separation method.…”
“…We measured the amount of ethanol in the gas phase over solutions of 3 wt% ethanol in different liquidspure deionized water, KOH in water, carbonate salts in water (Figure S1, Table S2)deploying every time the same controlled conditions. We were not able to quantify the ethanol concentration in the gas phase for the 7 M KHCO 3 solution due to immediate crystallization upon addition of ethanol; however, for KOH and K 2 CO 3 solution samples, the effect of salting-out is surprisingly highthe concentration of ethanol in the vapor phase above 7 M KOH is 6 times higher than that above watersuggesting that a vapor–liquid equilibrium-driven approach (distillation) can yield an efficient separation method.…”
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