操作温度の逆浸透膜透過流束および阻止率に及ぼす影響

概要

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Using three composite membranes (NS-300, NTR-7450, NTR-729 HF), reverse osmotic permeation flux and solute rejection have been measured at 1.5 MPa, 10-60° C for pure water, 0.5% NaCl and 0.5% MgSO4 aqueous solution. The results showed that the permeation remarkably increases, but rejection Ra slowly decreases, with the increase of operating temperature. The relationship between hydraulic permeability Lp and operating temperature in reverse osmotic separation have been theoretically derived using the solution-diffusion model. Introducing the temperature coefficient M defined by authors, the dependency of permeation on operating temperature can be expressed as following theoretical equation, lnLp (T) =lnLp (T) +Mln T/T0-Ps [Vs (T) /T-Vs (T0) /T0] (16) The dependence of rejection on temperature can be expressed as following experimental equation. Ra (T) =Ra (T0) (1+M/100) (T0/T-1) (19)
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