液膜液型膜蒸留によるエタノールの濃縮 : 液膜液型膜蒸留によるエタノールの分離を伴う連続発酵(第2報)

概要

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Liquid-membrane-liquid-type membrane distillation (LML-membrane distillation) for aqueous ethanol solution was investigated. The experiment was done using porous polytetrafluoroethylene (PTFE) tubing. The PTFE tube was set in the still. Ethanol solution was poured into the still and the solution was kept at 30℃. The distilled water flowed into the PTFE tube as absorption liquid. The temperature of the absorption liquid was kept lower than the temperature of the liquid in the still. When the distillate was not returned to the still, the composition of the absorption liquid changed with the passing of time, and the temperature of the absorption liquid was unsteady. After the distillate was return to the still over 15 h, the composition and the temperature of the absorption liquid was steady. The concentration ratio of ethanol, Y/X (Y : ethanol concentration in the absorption liquid, X : ethanol concentration in the still), was 1.6 when X was 10 to 15% (v/v) and the temperature of the absorption liquid was about 20℃ at the outlet of the PTFE tube. When the ethanol concentration in the absorption liquid was above 50% (v/v), the composition of the liquid was unstable. Therefore, in this method of LML-membrane distillation, the applicable limit of the ethanol concentration in the absorption liquid was estimated to be about 50% (v/v).
社団法人日本生物工学会の論文
1990-09-25