Worldwide, the Chlor-Alkali process is the most well-known method for the production of chlorine (Cl₂) and sodium hydroxide (NaOH). NaOH, also known as caustic soda, is a very important alkali with many applications in the processing and production of paper, detergents, aluminum, petrochemicals, inorganics, and in the food industry. The aqueous solution of caustic soda, known as “cell liquor," produced in this process must be concentrated from 11 to 50 percent weight, which is achieved through a multiple effect evaporator system. In some cases, the brine used as a raw material carries a few other components that cannot be separated before the feeding of the brine into the process. The presence of sulfates and chloride ions in addition to high NaOH concentrations (0.44 – 0.5 mass fraction) and high temperatures (above 60 °C, at 86 mmHg) causes the precipitation of a triple salt (Na₂SO₄ · NaCl · NaOH). This work focuses on using and validating the model of a triple effect evaporator in Aspen Plus using plant data. According to our results, lower temperatures and the extraction of sulfates could reduce the proportion of triple salt that precipitates in the last stages of the evaporator.

在世界范围内，氯碱法是生产氯（Cl ₂）和氢氧化钠（NaOH）的最著名方法）。NaOH，也称为苛性钠，是一种非常重要的碱，在纸张，洗涤剂，铝，石化产品，无机物和食品工业的加工和生产中具有许多应用。此过程中产生的苛性钠水溶液（称为“电解槽液”）必须浓缩至11％至50％（重量），这是通过多效蒸发器系统实现的。在将盐水送入过程之前，还有一些其他无法分离的成分：除了存在高浓度的NaOH（0.44 – 0.5质量分数）和高温（高于60°C，在86 mmHg下）之外，还存在硫酸盐和氯离子）导致三元盐（Na ₂ SO ₄  · NaCl  ·  NaOH）。这项工作着重于使用工厂数据在Aspen Plus中使用和验证三效蒸发器的模型。根据我们的结果，较低的温度和硫酸盐的萃取可以减少在蒸发器最后阶段沉淀的三盐的比例。