Heat-integrated pressure-swing distillation process for separation of the maximum-boiling azeotrope diethylamine and methanol

Zhang, Qingjun; Liu, Meiling; Li, Chenxiaodong; Zeng, Aiwu

doi:10.1016/j.jtice.2018.09.018

Cited by 45 publications

(12 citation statements)

References 30 publications

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“…Li et al investigated the HP-PSD process and showed that the operating cost could be reduced by 60% compared with the conventional PSD process. In addition, to evaluating PSD, the main criteria are the energy consumption per product flow rate, TAC, and CO 2 emissions, , while the process sustainability is neglected.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of Sustainable Pressure Swing Distillation for Minimum-Boiling Azeotrope Separation

You

Qiu

2019

Ind. Eng. Chem. Res.

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A systematic approach for designing an energy-saving and environmentally friendly pressure swing distillation (PSD) process for separating binary azeotropes is proposed and involves the initial determination of the operating pressure and separating sequence based on the temperature–composition (T–xy) diagram, optimization by the two-step optimization procedure via minimizing the lifetime total cost (LTC), heat integration (HI), and a heat pump to achieve further energy savings and increase the process sustainability. The Eco-indicator 99 (EI99) is first introduced as an assessment criterion to evaluate the damage to the environment and sustainability of the PSD process. The partial and full HI-PSD processes are studied, and their corresponding T–H diagrams are provided to evaluate the feasibility and degree of heat integration. Three HP-PSD processes are investigated and optimized by minimizing the LTC. The results show that compared with the literature design, our conventional PSD process reduces the LTC and EI99 by 43.42% and 47.86%. The partial HI-PSD processes could further decrease the LTC and EI99 by 20.71% and 27.19% compared with the conventional PSD process. Meanwhile, the full HP-PSD process could reduce the LTC and EI99 by 14.12% and 68.77% compared to the partial HI-PSD process. Hence, the full HP-PSD process is the most favorable from both economic and sustainability perspectives.

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Section: Introductionmentioning

confidence: 99%

Design and Optimization of Sustainable Pressure Swing Distillation for Minimum-Boiling Azeotrope Separation

You

Qiu

2019

Ind. Eng. Chem. Res.

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“…To further compare the EED, CGED, CEED, and HPED processes, the stage-enthalpy deficit and the stage-exergy loss in the separation process were studied, as shown in Figure 11. Zhang et al 57 showed that the higher the exergy loss, the lower the thermodynamic efficiency and the more the energy consumed in the production process. The accumulated heat and cooling demand of the column stage are shown in the enthalpy loss in Figure 11a.…”

Section: Exergy Analysismentioning

confidence: 99%

Molecular Mechanism, Thermoeconomic, and Environmental Impact for Separation of Isopropanol and Water Using the Choline-Based DESs as Extractants

Cui

Liu

Zhao

et al. 2020

Ind. Eng. Chem. Res.

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Deep eutectic solvents (DESs), as potential green solvents, can be used for the separation of the low-carbon alcohol azeotrope, which has become one of the hot spots in solvent research in recent years. In this work, choline chloride (ChCl)/glycerol (GI) (1:2) and ChCl/ethylene glycol (EG) (1:2) were used as extractants to study the extractive distillation process of isopropanol (IPA) dehydration. The high separation performance of the choline-based DESs was explained from the point of quantum chemistry. Economic impact, exergy loss, and environmental impact were compared between the new processes and the traditional process. The results displayed that the total cost of the two processes with DES as the extractant and using the heat pump process was reduced by 30.256, 30.918, and 36.229%, respectively. It saved a lot of cost and improved the thermodynamic efficiency. In terms of environmental impact, compared with the traditional process, the ChCl/GI (1:2) process reduced the emission of toxic and harmful substances by 39.94%, greatly improving environmental friendliness. The above results showed that the choline-based DESs performed excellently in the extractive distillation process for the separation of low-carbon alcohol azeotropes. Therefore, the development of new choline-based DESs is of great significance to the green, environmental protection and sustainable development of chemical and pharmaceutical industries.

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“…When the dosage of sodium hypochlorite was 400 mg·L −1 , the absorption peak at 206 nm disappeared and the characteristic absorption peak of sulfate at 191 nm presented clearly [29], indicating that carbon disul de was further degraded . Further, with the increase of the dosage of sodium hypochlorite, the characteristic absorption peak of diethylamine became weaker, indicating that the diethylamine was further degraded, with possible products of CO 2 and N 2 as follows [30]:…”

Section: Degradation Products Of Ddtc With Sodiummentioning

confidence: 99%

Study on the Degradation of Sodium Diethyldithiocarbamate (DDTC) in Artificially Prepared Beneficiation Wastewater with Sodium Hypochlorite

Cui

Wang

Zhao

et al. 2019

Journal of Chemistry

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e degradation of DDTC in beneficiation wastewater has become an increasingly concerned issue due to the serious effects on the environment. In this study, the degradation characteristics of DDTC in artificially prepared beneficiation wastewater were investigated by adding sodium hypochlorite as an oxidant, and the influences of different degradation conditions on removal efficiency of DDTC were analyzed systematically. e results indicated that the degradation rate of DDTC without sodium hypochlorite added can reach 88.4% in a stewing time of 6 h. When the dosage of sodium hypochlorite was 400 mg·L −1 , the degradation rate of DDTC can reach 91.28% for 1 min reaction time under the natural condition of pH value 5.98 and reaction temperature 25°C. e DDTC in the wastewater was firstly degraded into carbon disulfide and diethylamine, and then carbon disulfide was further degraded into CO 2 , S, or SO 4 2− , while diethylamine was degraded into N 2 and CO 2 . e research results can provide a technical basis for the treatment of beneficiation wastewater containing DDTC.

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Heat-integrated pressure-swing distillation process for separation of the maximum-boiling azeotrope diethylamine and methanol

Cited by 45 publications

References 30 publications

Design and Optimization of Sustainable Pressure Swing Distillation for Minimum-Boiling Azeotrope Separation

Design and Optimization of Sustainable Pressure Swing Distillation for Minimum-Boiling Azeotrope Separation

Molecular Mechanism, Thermoeconomic, and Environmental Impact for Separation of Isopropanol and Water Using the Choline-Based DESs as Extractants

Study on the Degradation of Sodium Diethyldithiocarbamate (DDTC) in Artificially Prepared Beneficiation Wastewater with Sodium Hypochlorite

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