Nickel/Cobalt separation was achieved in a pulsed sieve-plate extraction column using di(2-ethyl hexyl) phosphoric acid as the extractant. The liquid-liquid mass transfer involved in this process has been studied.;The value of the coefficients were in the 0.2 x 10-3 to 1.8 x 10-3cm/sec. range for cobalt, and 0.5 x 10-3 to 2.4 x 10-3cm/sec. for nickel.;By applying the pulsing technique to increase the degree of mixing between the two phases, the mass transfer rate was found to be significantly enhanced. The comparison of mass transfer coefficients with values obtained using different pulse amplitudes indicated that the coefficient value increased as the amplitude increased. The coefficient was also observed to be affected by the direction of mass transfer, such that the mass transfer coefficients for extraction were found to be higher than those obtained in stripping.;To evaluate the mass transfer characteristics of the operation, steady-state concentration profiles along the column were obtained by sampling both phases from each plate. Droplet size and interfacial area were estimated using a photographic method. From this information, the overall mass transfer coefficients in different sections of the column were calculated, and were found to vary with the concentration during the extraction, but remained rather constant during scrubbing and stripping.
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机译：使用二（2-乙基己基）磷酸作为萃取剂，在脉冲筛板萃取柱中实现镍/钴分离。研究了该过程中的液-液传质。系数的值在0.2 x 10-3至1.8 x 10-3cm / sec之间。钴的范围，以及0.5 x 10-3至2.4 x 10-3cm / sec。通过应用脉冲技术增加两相之间的混合程度，可以显着提高传质速率。传质系数与使用不同脉冲幅度获得的值的比较表明，系数值随幅度增加而增加。还观察到该系数受传质方向的影响，因此发现萃取的传质系数要高于汽提中获得的传质系数。通过从每个板中取样两个相来获得沿着柱子的方向。液滴尺寸和界面面积使用照相方法估算。根据此信息，可以计算出色谱柱不同部分的总传质系数，发现萃取过程中其总浓度随浓度而变化，但在洗涤和汽提过程中仍保持恒定。
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