用液膜技术回收水杨酸时的传质过程

MASS-TRANSFER PROCESS IN THE RECOVERY OF SALICYLIC ACDD BY LIQUID MEMBRANE

用液膜技术回收苯酚巳见诸文献,本文报导用液膜技术回收水杨酸,着重于水杨酸在液膜中渗透的动力学现象,用已有的液膜传质模型作了验证。 表面活性剂“兰—113B”为兰州炼油厂产品,水杨酸和氢氧化钠等试剂均为AR级·将2％的“兰113—B”煤油溶液和一定浓度的氢氧化钠水溶液按一定体积比(即油内比R_(oi))

The aqueous solution of salicylic acid can be recovered by liquid membrane process.The influence of rate of stirring (n), molar ratio of NaOH in internal phase and salicylicacid in external phase (r), volume ratio of oil phase to internal solution phase (Roi) andvolume ratio of emulsion phase to external solution phase (Rew) on the kinetics of masstransfer process were studied. It was shown that when r=1.2--1.5 the diffusion of salicy-lic acid was nonstationary and there was a linear relationship between concentration Cand t^(1/2)(t-time). When r≥3.52 the diffusion of salicilic acid was stationary and therewas a linear relationship between Ln (Co/C) and t.