Experimental and simulation study of nylon 6 solid-liquid extraction process

doi:10.1016/j.cjche.2017.12.002

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (5): 1022-1030.DOI: 10.1016/j.cjche.2017.12.002

• Separation Science and Engineering • 上一篇下一篇

Experimental and simulation study of nylon 6 solid-liquid extraction process

Chunxi Qin¹, Jie Tang¹, Fenglei Bi¹, Zhenhao Xi^1,2, Ling Zhao^1,2

1 Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2 State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

收稿日期:2017-06-16 修回日期:2017-11-23 出版日期:2018-05-28 发布日期:2018-06-29
通讯作者: Ling Zhao,E-mail address:zhaoling@ecust.edu.cn
基金资助:
Supported by the National Key Research and Development Program of China (2016YFB0302701), the Shanghai Rising-Star Program (16QB140130) and the 111 Project (B08021).

Experimental and simulation study of nylon 6 solid-liquid extraction process

Chunxi Qin¹, Jie Tang¹, Fenglei Bi¹, Zhenhao Xi^1,2, Ling Zhao^1,2

1 Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2 State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

Received:2017-06-16 Revised:2017-11-23 Online:2018-05-28 Published:2018-06-29
Contact: Ling Zhao,E-mail address:zhaoling@ecust.edu.cn
Supported by:
Supported by the National Key Research and Development Program of China (2016YFB0302701), the Shanghai Rising-Star Program (16QB140130) and the 111 Project (B08021).

摘要/Abstract

摘要： The solid-liquid extraction process of nylon 6 to eliminate small molecules, i.e., caprolactam (CL), cyclic dimers (CD) and cyclic trimers (CT), is investigated in detail by both batch extraction experiments and numerical simulations. In the batch extraction experiments, due to the small molecules attaching to the polymeric surface, the basic physical mechanism shifts from surface diffusion to internal diffusion as the extraction proceeded. The experimental data are well reproduced by a diffusion model consisting of two distinct steps, characterized as surface diffusion and internal diffusion. Furthermore, based on the established mass transfer mechanism and diffusion model of the two distinct steps, the equilibrium constants and internal diffusion coefficients of CL, CD and CT are acquired. An industrial countercurrent extraction tower is further simulated. It is found that the extraction efficiency of CL can be significantly improved by increasing the temperature at the bottom portion of the tower. The elimination of CD, which can be greatly promoted by a high-concentration CL-water solution, is controlled by mass transfer resistance, whereas the removal of CL is mainly affected by the equilibrium.

关键词: Solid-liquid extraction, Equilibrium, Diffusion, Numerical simulation

Abstract: The solid-liquid extraction process of nylon 6 to eliminate small molecules, i.e., caprolactam (CL), cyclic dimers (CD) and cyclic trimers (CT), is investigated in detail by both batch extraction experiments and numerical simulations. In the batch extraction experiments, due to the small molecules attaching to the polymeric surface, the basic physical mechanism shifts from surface diffusion to internal diffusion as the extraction proceeded. The experimental data are well reproduced by a diffusion model consisting of two distinct steps, characterized as surface diffusion and internal diffusion. Furthermore, based on the established mass transfer mechanism and diffusion model of the two distinct steps, the equilibrium constants and internal diffusion coefficients of CL, CD and CT are acquired. An industrial countercurrent extraction tower is further simulated. It is found that the extraction efficiency of CL can be significantly improved by increasing the temperature at the bottom portion of the tower. The elimination of CD, which can be greatly promoted by a high-concentration CL-water solution, is controlled by mass transfer resistance, whereas the removal of CL is mainly affected by the equilibrium.

Key words: Solid-liquid extraction, Equilibrium, Diffusion, Numerical simulation

Chunxi Qin, Jie Tang, Fenglei Bi, Zhenhao Xi, Ling Zhao. Experimental and simulation study of nylon 6 solid-liquid extraction process[J]. Chinese Journal of Chemical Engineering, 2018, 26(5): 1022-1030.

Chunxi Qin, Jie Tang, Fenglei Bi, Zhenhao Xi, Ling Zhao. Experimental and simulation study of nylon 6 solid-liquid extraction process[J]. Chin.J.Chem.Eng., 2018, 26(5): 1022-1030.

参考文献

[1] X. Jing, H.Y. Mi, T. Cordie, M. Salick, X.F. Peng, L.S. Turng, Fabrication of porous poly (ε-caprolactone) scaffolds containing chitosan nanofibers by combining extrusion foaming, leaching, and freeze-drying methods, Ind. Eng. Chem. Res. 53(46) (2014) 17909-17918.

[2] K. Tai, T. Tagawa, The kinetics of hydrolytic polymerization of ε-caprolactam. V. Equilibrium data on cyclic oligomers, J. Appl. Polym. Sci. 27(8) (1982) 2791-2796.

[3] K.C. Seavey, N.P.K. And, Y.A. Liu, T.N. Williams, C.C. Chen, A new phase-equilibrium model for simulating industrial nylon-6 production trains, Ind. Eng. Chem. Res. 42(17) (2003) 3900-3913.

[4] K.C. Seavey, Y. Liu, B. Lucas, N.P. Khare, T. Lee, J. Pettrey, T.N. Williams, J. Mattson, E. Schoenborn, C. Larkin, New mass-transfer model for simulating industrial nylon-6 production trains, Ind. Eng. Chem. Res. 43(17) (2004) 5063-5076.

[5] A. Gaglione, Multiscale Modeling of an Industrial Nylon-6 Leacher, Master Thesis, Virginia Polytechnic Institute and State University, America, 2007.

[6] K. Seavey, Y.A. Liu, Step-growth polymerization process modeling and product design, John Wiley & Sons, England, 2009.

[7] J. Erbes, A. Ludwig, G. Pipper, Continuous polyamide extraction process, China Pat., 1284095 A, 2001.

[8] Y. Xing, Control strategy of cyclic dimer in nylon 6 manufacture process, Master Thesis, East China University of Science and Technology, China, 2014.

[9] E.W. Washburn, Note on a Method of Determining the Distribution of Pore Sizes in a Porous Material, Cambridge University Press, England, 1921.

[10] J. Crank, The Mathematics of Diffusion, Oxford University Press, England, 1979.

[11] J.C. Urban, A. Gomezplata, Axial dispersion coefficients in packed beds at low reynolds numbers, Can. J. Chem. Eng. 47(4) (2010) 353-359.

[12] Yao, Principles of Chemical Engineering, second edition Tanjin University Press, Tianjin, 1999.

[13] D. Van Krevelen, P. Hoftijzer, Studies of gas absorption. I. Liquid film resistance to gas absorption in scrubbers, Recueil des Travaux Chimiques des Pays-Bas 66(1) (1947) 49-65.

[14] P.J.A.M. Kerkhof, Countercurrent plug flow mass exchange with internal particle diffusion, Chem. Eng. Sci. 62(7) (2007) 2040-2067.

[15] Y. Fujiwara, S.H. Zeronian, Crystallization of cyclic oligomers on the surface of nylon 6 fibers, J. Appl. Polym. Sci. 23(12) (2010) 3601-3619.

[16] V.S. Moholkar, M.M.C.G. Warmoeskerken, Investigations in mass transfer enhancement in textiles with ultrasound, Chem. Eng. Sci. 59(2) (2004) 299-311.

[17] F. Veglio, M. Trifoni, F. Pagnanelli, L. Toro, Shrinking core model with variable activation energy:a kinetic model of manganiferous ore leaching with sulphuric acid and lactose, Hydrometallurgy 60(2) (2001) 167-179.

[18] B. Avvaru, S. Roy, S. Chowdhury, K. Hareendran, A.B. Pandit, Enhancement of the leaching rate of uranium in the presence of ultrasound, Ind. Eng. Chem. Res. 45(22) (2006) 7639-7648.

[19] Y. Arai, K. Tai, H. Teranishi, T. Tagawa, Kinetics of hydrolytic polymerization of ε-caprolactam:3. Formation of cyclic dimer, Polymer 22(2) (1981) 273-277.

[20] S. Negoro, T. Ohki, N. Shibata, K. Sasa, H. Hayashi, H. Nakano, K. Yasuhira, D. Kato, M. Takeo, Y. Higuchi, Nylon-oligomer degrading enzyme/substrate complex:catalytic mechanism of 6-aminohexanoate-dimer hydrolase, J. Mol. Biol. 370(1) (2007) 142.

[21] C. Wang, Process Simulation and Analysis of Nylon 6 Manufacture Process, East China University of Science and Technology, China, 2015.

Experimental and simulation study of nylon 6 solid-liquid extraction process

Experimental and simulation study of nylon 6 solid-liquid extraction process

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