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Research paper : Innovation in distillation processes (M. Nakaiwa et al.)−62−Synthesiology - English edition Vol.2 No.1 (2009) manufacturing such a design of equipment as well as the obstruction of liquid flow within the column caused by the heat pipes. On the other hand, we studied via simulation technology to prevent decreased distillation performance, and adopted a simple double-tube structure that led more straightforwardly to practical applications. If the amount of heat transfer was not enough, we made the heat transfer area larger by extending the height of column. While the HIDiC process is a realization of PI by “integration” of the distillation and heat transfer, we believe our success was due to the strategy of maintaining distillation performance even in pursuing energy saving through the “integration” of heat transfer into the distillation.7 ConclusionIn this paper, an approach for the development of energy-saving technology for the present process was shown with the concept of “detuning” from the ideal state. We also discussed the development of energy-saving distillation processes, including heat-integrated distillation column (HIDiC). In the case described here, the procedures were: a) to determine the thermodynamically ideal state for the process to be examined; b) to perform “detuning” from the ideal state down to more attainable conditions; c) to evaluate the energy-saving performance, cost, equipment configuration, and other considerations for realistic feasibility after “detuning”; and d) if the evaluation result is not satisfactory, return to b) and explore other “detuning” paths. The course of b) c) d) forms a loop, which we consider to be one of the paths to the realization of PI. Actually, we believe that the development of HIDiC followed this path to reach the practical application stage. In summary, we described our thoughts and approaches to practical application of the HIDiC process, which is an energy-saving distillation process, from the perspectives of PI and “detuning,” We hope this paper will help the progress of Synthesiology.References[1][2][3][4][5][6]Y. Hirata: Strategy of process development - From process improvement toward process intensification -, Kagaku Kogaku, 69(3), 144-147 (2005) (in Japanese).C. Kuroda and H. Matsumoto: Green process engineering (GPE) and process intensification (PI), Kagaku Kogaku, 72(4), 180-183 (2008) (in Japanese).A. Stankiewicz and J. A. Moulijn: Process intensification: Transforming chemical engineering, Chem. Eng. Prog., 96(1), 22-34 (2000).A. Stankiewicz: Serving the triple bottom line: Process intensification role in sustainable manufacturing, Kagaku Kogaku, 69(3), 148-150 (2005).J. A. Moulijn, A. Stankiewicz, J. Grievink and A. Gorak: Process intensification and process systems engineering: A friendly symbiosis, Comput. Chem. Eng., 32(1-2), 3-11 (2008).K. Igarashi: Zairyo･seizo gijutsu no aratana torikumi (New efforts on material and manufacturing technology), AIST Today, 4(9), 4-5 (2004) (in Japanese).M. Yorizane: Joryu kogaku handobukku (Distillation engineering handbook), Asakura Shoten (1966) (in Japanese).K. Kato: Kagaku kikai to sochi no rekishi (The history of chemical machines and apparatus), Sangyo Gijyutu Center (1978) (in Japanese).C. J. King: Separation processes, 2nd ed., McGraw Hill, New York (1980).Z. Fonyó: Thermodynamic analysis of rectification I, Reversible model of rectification, Intern. Chem. Eng., 14(1), 18-27 (1974).F.B. Petlyuk, V.M. Platonov and I.V. Girsanov: The design of optimal rectification cascades, Intern. Chem. Eng., 5(2), 309-317 (1965).The Society of Chemical Engineers, Japan: Kagaku kogaku no shinpo (Advances in Chemical Engineering) No. 37, Maki Shoten (2003) (in Japanese).M. Nakaiwa: Energy saving technology through the internally heat integration in the distillation process, Journal of the Combustion Society of Japan, 50, 235-241 (2008) (in Japanese).M. Nakaiwa, K. Huang, A. Endo, T. Ohmori, T. Akiya and T. Takamatsu: Internally heat-integrated distillation columns: A review, Chem. Eng. Res. Design, 81(1), 162-177 (2003).R.S.H. Mah, J.J. Nicholas, Jr. and R.B. Wodnik: Distillation with secondary reflux and vaporization: A comparative evaluation, AIChE J, 23(5), 651-658 (1977).M. Nakaiwa: Naibu Netukokan-gata joryu-to (HIDiC) gijutsu kaihatsu no kongo no tenkai (Further R&D of internally heat-integrated distillation column (HIDiC)), Bunri Gijutsu, 36(4), 202-204 (2006) (in Japanese).D.J. Seader: Continuous distillation and method, U.S. Patent 4, 234, 391 (1980).[7][8][9][10][11][12][13][14][15][16][17]AuthorMasaru Nakaiwa Graduated from the Department of Chemical Engineering, Kyoto University in 1980. Joined the National Chemical Laboratory for Industry, Agency for Industrial Science and Technology in 1980. Participated in overseas research at the Kansas State University, U.S.A. in 1990 -1991. Leader of Energy-Efficient Chemical Systems Group, Research Institute for Green Technology, AIST from 2001. Currently, the Director of the Research Institute for Innovation in Sustainable Chemistry. Engaged in the researches mainly on energy saving in chemical processes and application of nonlinear chemical systems. For this paper, took the charge of the part related to the HIDiC process with the “detuning.”Takao OhmoriGraduated from the Department of Chemical Engineering, Graduate School of Engineering, Kyoto University in 1984. Joined the National Chemical Laboratory for Industry, Agency for Industrial Science and Technology in 1985. Participated in overseas research at the West Virginia University, U.S.A. in 1991 -1992. Leader of Energy-Efficient Chemical Systems Group, Research Institute for Innovation in Sustainable Chemistry, AIST from 2006. Currently, the Principal Research Scientist of the Research Institute for Innovation in Sustainable Chemistry. Engaged in the researches mainly on nonlinear phenomena, complex system, and process intensification. For this paper, took the charge of the part related to the process intensification.

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