01766nas a2200169   4500008004100000022001400041245010300055210006900158260000900227300001400236490000700250520114600257100002201403700002101425700002101446856012901467       2020                        eng d  a0888-588500aExtractive distillation configuration for nitric acid dehydration using sulfuric acid as a solvent0 aExtractive distillation configuration for nitric acid dehydratio  cAPR   a6183-61930 v593 a<p>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.</p>
1 aGhuge, Pravin, D.1 aMali, Nilesh, A.1 aJoshi, Sunil, S.  uhttps://library.ncl.res.in/content/extractive-distillation-configuration-nitric-acid-dehydration-using-sulfuric-acid-solvent02103nas a2200241   4500008004100000022001400041245013500055210006900190260000900259300001100268490000800279520129300287653001401580653001001594653001201604653001001616653002901626653001001655100002201665700002101687700002101708856013201729       2021                        eng d  a0378-381200aEffect of CaCl2 and ZnCl2 salts on isobaric vapor-liquid equilibrium in separation of the azeotropic mixture of ethanol plus water0 aEffect of CaCl2 and ZnCl2 salts on isobaric vaporliquid equilibr  cJUN   a1130000 v5373 a<p>Present work analyzes potential of calcium chloride (CaCl2) and zinc chloride (ZaCl(2)) salts as entrainer for breaking the minimum boiling azeotrope of ethanol and water. Isobaric vapor-liquid equilibrium (VLE) data for the binary systems of water + ethanol and ternary system of water + ethanol + calcium chloride, and water + ethanol + zinc chloride were measured at a constant pressure of 94.5 kPa. The effect of salts on the relative volatility of ethanol to water as well as on the vapor phase mole fractions of ethanol were also studied experimentally. From the experimental results, it is observed that with addition of salts, the azeotropic point of the ethanol and water system can be eliminated. Salting out effects in case of calcium chloride was more than that zinc chloride salt. The results obtained in this work showed that calcium chloride could be a better choice for separation of the water + ethanol azeotrope. Electrolyte nonrandom two-liquid (eNRTL) model was used to correlate the experimental VLE data. The model prediction with the regressed parameters was found in well agreement with the experimental data. The experimental data obtained in this work was found thermodynamically consistent using van Ness test. (C) 2021 Elsevier B.V. All rights reserved.</p>10aAzeotrope10aeNRTL10aEthanol10asalts10aVapor-liquid equilibrium10aWater1 aGhuge, Pravin, D.1 aMali, Nilesh, A.1 aJoshi, Sunil, S.  uhttps://library.ncl.res.in/content/effect-cacl2-and-zncl2-salts-isobaric-vapor-liquid-equilibrium-separation-azeotropic-mixture