Extractive Distillation Configuration for Nitric Acid Dehydration Using Sulfuric Acid as a Solvent,Industrial & Engineering Chemistry Research

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Extractive Distillation Configuration for Nitric Acid Dehydration Using Sulfuric Acid as a Solvent
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-17 , DOI: 10.1021/acs.iecr.0c00052
Pravin D. Ghuge _{1,

2} , Nilesh A. Mali _{1,

2} , Sunil S. Joshi _{1,

2}

Affiliation

In this work, an extractive distillation configuration for dehydration of nitric acid is proposed with sulfuric acid as a solvent. Thermodynamic modeling of the vapor–liquid equilibrium of binary and ternary systems of nitric acid/water/sulfuric acid is carried out using the electrolyte non-random two-liquid (eNRTL-RK) thermodynamic property method in the Aspen plus process simulator. The model performance is validated by comparing the experimental data with the estimated data by the eNRTL-RK model and is found to be in good agreement. The thermodynamic model is then used for developing a triple-column extractive distillation sequence, comprising a preconcentration column, an extractive distillation column, and a solvent recovery column. The configuration is designed, simulated, and optimized to concentrate dilute nitric acid using sulfuric acid as a solvent to break the nitric acid–water azeotrope. The operating and structural parameters of the distillation configuration are optimized simultaneously with an objective of minimizing the energy consumption and the total annual cost (TAC) of the overall configuration.

中文翻译：

以硫酸为溶剂的硝酸脱水萃取蒸馏装置

在这项工作中，提出了一种以硫酸为溶剂的用于硝酸脱水的萃取蒸馏装置。硝酸/水/硫酸的二元和三元系统的汽-液平衡的热力学模型是使用Aspen plus过程模拟器中的电解质非随机两液（eNRTL-RK）热力学性质方法进行的。通过将实验数据与eNRTL-RK模型的估计数据进行比较，验证了模型的性能，发现该模型性能良好。然后将热力学模型用于开发三塔萃取蒸馏序列，该序列包括预浓缩塔，萃取蒸馏塔和溶剂回收塔。配置经过设计，模拟，并进行了优化，以使用硫酸作为溶剂浓缩稀硝酸，以破坏硝酸-水共沸物。同时优化蒸馏装置的操作和结构参数，目的是使整个装置的能耗和总年度成本（TAC）最小。

更新日期：2020-03-19

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