Proposta de intensificação do processo de separação de acetona e n-heptano via recompressão de vapor
DOI:
https://doi.org/10.22409/engevista.v22i1.65867Keywords:
vapour recompression, extractive distillation, energy savingAbstract
Acetone and n-heptane are commonly found in effluents from chemical and pharmaceutical industries. Due to their tendency to form azeotropic mixtures, their separation requires specific processes, such as extractive distillation. In response to the environmental impacts associated with its activities, the chemical industry has been undergoing technological transformations aimed at increasing the eco-efficiency of its processes. Vapor recompression has been highlighted as an intensification strategy with significant potential for this purpose. In the present work, three configurations based on vapor recompression were proposed for the separation process of the acetone and n-heptane mixture. The conventional process and the intensified configurations were designed using computer simulations in UniSim Design R490 software. To obtain more realistic results, the respective utility plant, including systems for cooling water, R-152a refrigeration, and steam generation, was also considered for each process. The proposed configurations PI2 and PI3 stood out by providing reductions of 39.51% and 34.43%, respectively, in total energy consumption.
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References
BERJE, J.; SCHEDEMANN, A.; GMEHLING, J. Liquid densities of acetone and n-heptane and excess volumes of the binary system in a wide temperature and pressure range. Fluid Phase Equilibria, v. 300, p. 110-115, 2011.
KAZEMI, A.; MEHRABANI-ZEINABAD, A.; BEHESHTI, M. Evaluation of various heat pump assisted direct, indirect, Petlyuk and side stripper sequences for three-product separations. Chemical Engineering Science, v. 181, p. 19-35, 2018.
KIANINIA, M.; ABDOLI, S. M. The Design and Optimization of Extractive Distillation for Separating the Acetone/n-Heptane Binary Azeotrope Mixture. ACS omega, v. 6, p. 22447-22453, 2021.
KISS, A. A.; SMITH, R. Rethinking energy use in distillation processes for a more sustainable chemical industry. Energy, v. 203, p. 117788, 2020.
LIU, J. L.; WANG, X. Y.; ZHANG, L. L.; FANG, M. J.; WU, Y. L.; WU, Z.; QIU, Y. K. Two-dimensional countercurrent chromatography× high performance liquid chromatography with heart-cutting and stop- and-go techniques for preparative isolation of coumarin derivatives from Peucedanum praeruptorum Dunn. Journal of Chromatography A, v. 1374, p. 156-163, 2014.
MARIPURI, V. O.; RATCLIFF, G. A. Measurement of isothermal vapor-liquid equilibriums for acetone-n-heptane mixtures using modified Gillespie still. Journal of Chemical and Engineering Data, v. 17, n. 3, p. 366-369, 1972.
MARLOT, L.; FAURE, K. Preparative two dimensional separations involving liquid–liquid chromatography. Journal of Chromatography A, v. 1494, p. 1-17, 2017.
PALUDO, G. C.; CATHARINA, J. P. B. Avaliação da ecoeficiência e da intensificação do processo de separação de acetona e n-heptano via recompressão de vapor. Trabalho de Conclusão de Curso (Engenharia Química), Universidade Federal Fluminense, 2023. Disponível em: https://app.uff.br/riuff/handle/1/29879. Acesso em: 13 set. 2023.
ZHU, Z.; BAI, W.; QI, P.; DAI, Y.; WANG, Y.; CUI, P.; GAO, J. Liquid liquid equilibrium data for the separation of acetone from n-heptane using four imidazolium-based ionic liquids. Journal of Chemical & Engineering Data, v. 64, p. 1202-1208, 2019.
