液相并流液-液-固三相浸出器的理论级计算

Calculation of Theoretical Stages for Liquid-liquid-solid Three-phase Cocurrent Flow Extractor

按双液相溶剂并流浸出破碎油菜籽的方式 ,建立了浸出器理论级计算模型。模型关联了各股物料相对流率、油脂在各流股的相平衡参数 ,考虑了菜籽粕对两相溶剂的夹带返混作用 ,计及了浸取级效率。该模型可用于求取满足一定浸出要求所需浸出器的理论级数 ,或用于求取正在使用浸出器的两相溶剂的返混程度和平均级效率。模型计算结果与串级实验测定结果吻合较好 ,串级实验的级效率在 0 3 2～0 5 4之间。模型计算结果表明 ,甲醇相溶剂比 (L/kg)的大小和菜籽粕夹带甲醇量的多少对油浸取级数影响不大 ,但己烷相溶剂比 (L/kg)的大小和菜籽粕夹带己烷量的多少对油浸取级数影响明显。该理论级计算模型可用于浸出过程的设计 ,可为实际生产提供参考数据。

A model for calculation of theoretical stages in liquid-liquid-solid three phase leaching was proposed according to the leaching manner of the methanol phase and hexane phase contacting abreast with grounded rapeseed meal The model correlated the relative flow rate of each material stream entering and leaving the column and the equilibrium solubility of oil in each material stream The model also included the back mixing effects of the two-phase solvent entrained by the rapeseed marc phase and the average stage efficiency The model could be used to calculate the theoretical stage number of a column in meeting the desired leaching task or to calculate the average stage efficiency for a column in using The reliability of the model was confirmed by a determination of cascade experiments and the average stage efficiency of cascade experiments was in the range of 0 32～0 54 under different leaching conditions according to the model calculation The model also indicated that the theoretical stages number of a column was influenced slightly by the ratio of methanol to rapeseed (L/kg) and the back mixing amount methanol phase, but obviously by the ratio of hexane to rapeseed (L/kg) and the back mixing amount hexane phase The model could be applied to provide some useful information and helpful to the design of leachers