酢酸水溶液の逆浸透濃縮

概要

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Reverse osmotic concentration of aqueous acetic acid solution was carried out using composite membrane PEC-1000 supplied from Toray Co. Ltd. Separation of acetic acid and flux through the membrane were measured under the following conditions : concentration of acetic acid ; 1.8, 2.5, 5. 1, 9.9 and 14.4 wt%, operating pressures; 2.9, 3.9, 5.5, and 6.9 MPa. Measured separation were around 85% at lower solute concentration, but less than 75% at higher solute concentration and medium operating pressure. An analysis of the data with Spiegler-Kedems transport model shows that the values of reflection coefficient σ, solute and hydraulic permeabilities ω and Lp were 1.0, 1.31 × 10-11 and 0.93 × 10-7 mol./(m2. Pa.s), respectively. Energy and membrane area required were calculated to concentrate dilute acetic acid solutions by reverse osmosis. The energy per one kilogram of the concentrated acetic acid is proportional to the operating pressure and slightly depends on final concentration and concentration polarization, and found 0.1 to 0.30 KWh per kg by to concentrate up to 13.0wt% from 1.3 wt%. The membrane area is inversely proportionalto the operating pressure and found 0.07, 0.10 and 0.23m2/(kg acetic acid/ day), for 10, 8, 5 MPa at no concentration polarization to concentrate upto 13.0 wt%. The membrane area is strongly dependent on concentration polarization.
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