Distiller waste produced from the Solvay Process, which mainly contains calcium chloride (CaCl₂), is being discharged and has not yet been fully recycled. In this study, a coupled reaction and solvent extraction process was adopted to utilize distiller waste using the mixed organic solvent composed of N235 and isoamylol. High purity and good crystallinity calcite with an average of 40~50 μm were prepared in this process. The effect of operation conditions was firstly studied and the conversion rate of CaCl₂ reached 83.40% in single-stage with the optimized conditions: reaction time of 3 h, N235/isoamylol volume ratio of 1, reaction temperature of 25°C, N235/CaCl₂ molar ratio of 3, and the initial CaCl₂ concentration of 1 mol·L⁻¹. The enthalpy change of the overall reaction was −89.93 kJ·mol⁻¹. Then, the phase equilibrium was measured and the theoretical extraction stage was predicted to be 3 with the target conversion rate of 90%. Three-stage counter-current extraction process showed that about 93.75% CaCl₂ was mineralized into CaCO₃ and the results had a good agreement with the McCabe-Thiele calculation. This indicated that multi-stage counter-current extraction can effectively improve the conversion rate of Ca²⁺ and related result was of great significance in treating distiller waste industrially.

由索尔维工艺产生的蒸馏废料主要是氯化钙（CaCl ₂），目前正在排放中，尚未完全回收。在这项研究中，采用了耦合反应和溶剂萃取工艺，以利用由N235和异戊醇组成的混合有机溶剂来利​​用蒸馏器废物。该工艺制备了平均纯度为40〜50μm的高纯度，结晶度好的方解石。首先研究了操作条件的影响，在最佳条件下，单阶段CaCl ₂的转化率达到83.40％：反应时间为3 h，N235 /异戊醇的体积比为1，反应温度为25°C，N235 / CaCl ₂摩尔比为3，初始CaCl ₂浓度为1mol·L^-1。整个反应的焓变化为-89.93kJ·mol ^-1。然后，测量相平衡并预测理论萃取阶段为3，目标转化率为90％。三级逆流萃取过程表明，约93.75％的CaCl ₂被矿化成CaCO ₃，结果与McCabe-Thiele的计算结果吻合良好。这表明多级逆流萃取可有效提高Ca ²⁺的转化率，相关结果对工业处理酒糟具有重要意义。