大孔树脂吸附异硫氰酸酯的动态相平衡研究

Studies on dynamic phase equilibriums of Isothiocyanates adsorbed in macroporous resin

通过对大孔树脂吸附柱传质区的分析，测定了该树脂在特定条件下的传质区长度，并考查了异硫氰酸酯（ITCs）初始浓度、流速及树脂柱横截面积对传质区长度的影响，结果显示初始浓度和流速与传质区长度正相关；树脂柱横截面积是通过改变流速来影响传质区长度的。分析了装柱高度对树脂利用率的影响，当柱床高度介于传质区的2～3倍之间，对操作和吸附剂的利用率都较为有利。95％乙醇用于ITCs的洗脱速度快、效率高，洗脱后的树脂经简单再生后可重复使用，但吸附能力略有下降。

In this paper, the length of transference mass zone was determined by analyses of the transference mass zone of macroporous adsorption column under the special conditions. In addition, the effects of the initial concentration of ITCs, flow velocity and the cross section of the resin column on the length of the transference mass zone have also been studied. The results show that the length of the transference mass zone was positively correlated with the initial concentration of ITCs and flow velocity. The cross section of the resin column did not affect the length of the transference mass zone but did the solvent flux. The influence of total bed length on the efficiency of resin has also been studied. The optimum total bed length was 2-3 times of the length of transference mass zone. The resin can be reused by simple regeneration using 95 % ethanol solution, but the adsorption ability decreases slightly.