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Received May 3, 2018
Accepted October 30, 2018
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Use of multiple inter-reboilers to achieve energy savings and improve thermodynamic efficiency of the distillation of N,N-dimethylformamide wastewater
1Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou 213164, P. R. China 2College of Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
gaoxiaoxin@163.com
Korean Journal of Chemical Engineering, January 2019, 36(1), 77-83(7), 10.1007/s11814-018-0182-x
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Abstract
The purification of N,N-dimethylformamide wastewater involves an energy intensive distillation process. We propose a novel energy-saving process scheme involving multiple inter-reboilers sed. In this scheme, ideal thermodynamic model non-random two liquid (NRTL) model was used to calculate the phase equilibrium using Aspen Plus platform. While the relationship between important process parameters and energy consumption by the distillation process was studied, several parameters such as the most suitable positions for the inter-reboilers and the most reasonable steam extraction rates were obtained. The feasibility was detected under the same separation duties and main technological structure. For 10wt% DMF wastewater, the inter-reboilers were installed on the 37th, 38th and 39th plates, while the corresponding heat transferred values were 3,038 kW, 91 kW and 179kW, respectively. In comparison to the conventional distillation process, an energy consumption of 77.43% and thermodynamic efficiency of 65.69% were obtained. For 20 wt% DMF wastewater, the inter-reboilers were installed on the 21st and 25th plate, while the corresponding values for the heat transferred were 1,632kW, and 1,450kW, respectively. In comparison to the conventional distillation process, the energy consumption can be reduced by 71.31%, while the thermodynamic efficiency can be improved by 47.10%.
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References
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Carey JH, Lawrence J, Tosine HM, Bull. Environ. Contam. Toxicol., 16(6), 697 (1976)
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Hua C, Li XG, Xu SM, Bai P, Chin. J. Chem. Eng., 15(2), 286 (2007)
Lu EX, Li XL, Wu Z, Chem. Eng., 74(78), 36 (2008)
Luyben WL, Distillation design and control using AspenTM simulation, Wiley-Interscience, New Jersey (2006).
Fang J, Li CL, Wang HH, Liu JD, Acta. Petrolei. Sinica, 27, 129 (2011)
Gao XX, Ma ZF, Ma JQ, Energy Technol., 2(3), 250 (2014)
Hamidreza S, Heat. Mass. Transfer, 51(10), 1393 (2015)
Xingang IL, Lin C, Wang L, Front. Chem. Sci. Eng., 7(437), 446 (2013)
Soares PF, Zemp R, Jobsen M, Chem. Eng., 66(13), 2920 (2011)
