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用国产和自制的KB_0Y分子筛(K-Ⅰ和K-Ⅱ)和国外的一种Y型分子筛,对对位二甲苯—乙基苯二元体系,在室温下进行液相吸附,分别用Everett方程和惰性组份作标准物法进行整理,测得吸附容量Ms、吸附等温线和选择性系数α.发现对位二甲苯平衡浓度x_1≤0.2时,遵循Henry定律q_1=kHx_1,Henry常数对上述三种分子筛分别为0.368、0.409和0.290;x_1≤0.3时,遵循Freundlich定律q_1=kFx_1~(1/n),常数kF近似为1,n分别为2.87、2.66和3.51.吸附容量为0.16-0.22(克/克分子筛).选择性系数在2.1～2.6之间.两种处理方法所得结果大致相符.此外,在微分吸附床层上进行动力学实验,对测定吸附速度、解吸速度及其总传质系数的方法进了初步的摸索,发现总传质系数k_0随q/qm的增加而下降,当吸附阶段q/qm>0.4和解吸阶段q/qm>0.1时,k_0与(1-q/qm)成正比.
The para-xylene-ethylbenzene binary system was prepared by domestic and home-made KB_0Y molecular sieves (K-Ⅰ and K-Ⅱ) and a Y-type molecular sieve abroad, and was subjected to liquid phase adsorption at room temperature. Everett equation And inert components as the standard method, the adsorption capacity Ms, adsorption isotherm and the selectivity coefficient α were found. When the equilibrium concentration of para-xylene x_1≤0.2 was found, follow Henry’s law q_1 = kHx_1, The molecular sieves were 0.368, 0.409 and 0.290, respectively. When x_1≤0.3, Freundlich’s law q_1 = kFx_1 ~ (1 / n) was obeyed, the constant kF was approximately 1, and n were 2.87, 2.66 and 3.51 respectively. The adsorption capacity was 0.16-0.22 G / mol molecular sieve) .The selectivity coefficients ranged from 2.1 to 2.6.The results obtained by the two methods were in good agreement with each other.In addition, kinetic experiments were carried out on the differential adsorption bed to determine the adsorption rate, desorption rate and total mass transfer Coefficient of the method into a preliminary exploration and found that the total mass transfer coefficient k_0 with q / qm increases with the decline, when the adsorption phase q / qm> 0.4 and the desorption phase q / qm> 0.1, k_0 and (1-q / qm ) Is proportional.