Liquid-holdup regions research of novel reactive distillation column for C5 fraction separation

doi:10.1016/j.cjche.2016.09.010

Abstract

Abstract: Recent advances in technologies of reactive distillation (RD) offer various design concepts for chemical processes.For separation of cracking C5 fraction,one of the main challenges is improving the conversion of cyclopentadiene (CPD) and the recovery of isoprene (IP).In the current work,a novel reactive distillation column with several liquid-holdup regions was designed,since it allows long residence time and provides flexibility for narrowing the efficiency gap between reaction and distillation.By use of Aspen Plus,a corresponding mathematic model was established and verified to be accurate.Following that,comprehensive studies were carried out for the design of liquid-holdup regions position.Details and principles about the separation performance with the liquid-holdup regions were revealed and optimized parameters were determined with 100 theoretical plates,feed position of 35th plate,and four liquid-holdup regions at 25th,60th,75th and 90th plate.The designed RD column could well meet the technical requirement,and influence of other important factors including residence time,operating pressure and reflux ratio was further investigated.

Key words: Cracking C5, Reactive distillation, Liquid-holdup region, Cyclopentadiene, Isoprene

摘要： Recent advances in technologies of reactive distillation (RD) offer various design concepts for chemical processes.For separation of cracking C5 fraction,one of the main challenges is improving the conversion of cyclopentadiene (CPD) and the recovery of isoprene (IP).In the current work,a novel reactive distillation column with several liquid-holdup regions was designed,since it allows long residence time and provides flexibility for narrowing the efficiency gap between reaction and distillation.By use of Aspen Plus,a corresponding mathematic model was established and verified to be accurate.Following that,comprehensive studies were carried out for the design of liquid-holdup regions position.Details and principles about the separation performance with the liquid-holdup regions were revealed and optimized parameters were determined with 100 theoretical plates,feed position of 35th plate,and four liquid-holdup regions at 25th,60th,75th and 90th plate.The designed RD column could well meet the technical requirement,and influence of other important factors including residence time,operating pressure and reflux ratio was further investigated.

关键词: Cracking C5, Reactive distillation, Liquid-holdup region, Cyclopentadiene, Isoprene

Liang Guo, Tiefeng Wang, Dongfeng Li, Jinfu Wang. Liquid-holdup regions research of novel reactive distillation column for C5 fraction separation[J]. , 2017, 25(4): 433-441.

References

[1] L. Guo, D. Li, J. Wang, Progresses in the separation of steam cracking C5 fraction at home, Petrochem. Technol. 44(2) (2015) 252-260.
[2] L. Wang, J. Yang, J. Liu, Development and utilization of C5 distillate, Sci. Technol. Chem. Ind. 21(5) (2013) 83-86.
[3] L. Zhang, Development and application of steam cracking C5 fraction, Petrochem. Ind. Appl. 27(4) (2008) 16-18.
[4] J. Hu, X. Li, H. Xu, Y. Lu, P. Li, Study of co-dimerization in C5 reaction-distillation, Petrochem. Technol. 27(4) (2001) 53-58.
[5] R. Baur, A.P. Higler, R. Taylor, R. Krishna, Comparison of equilibrium stage and nonequilibrium stage models for reactive distillation, Chem. Eng. J. 76(1) (2000) 33-47.
[6] B. Zhang, M. Wang, Z. Luo, S. Wang, Q. Dai, Y. Hu, Z. Cheng, Development of etherification reaction for pyrolysis C5 olefins and application, Petrol. Ref. 45(3) (2015) 30-35.
[7] X. Chen, Z. Bao, Polymerization of dienes in C5 fraction by ionic liquid catalyst, Petrochem. Technol. 36(3) (2007) 232-236.
[8] J. Liu, X. Wang, Z. Zhang, J. Li, Formation of dicyclopentadiene by thermal dimerization from C5 fractions, Petrochem. Technol. 25(4) (1996) 248-252.
[9] S. Zhao, J. Huang, F. University, Fuzhou and Tianjin, Coupled reaction/distillation process for hydrolysis of methyl acetate, Chin. J. Chem. Eng. 18(5) (2010) 755-760.
[10] S. Sun, G. Huang, Simulation of reactive distillation process for monosilane production via redistribution of trichlorosilane, Chin. J. Chem. Eng. 22(3) (2014) 287-293.
[11] H. Tian, Z. Huang, T. Qiu, Reactive distillation for producing n-butyl acetate:experiment and simulation, Chin. J. Chem. Eng. 20(5) (2012) 980-987.
[12] H.-C. Hsu, S.-J. Wang, J.D.-Y. Ou, D.S.H. Wong, Simplification and intensification of a C5 separation process, Ind. Eng. Chem. Res. 54(40) (2015) 9798-9804.
[13] X. Wang, Z. Bao, Study on thermal dimerization of dienes in C5 fraction, J. Nanj. Univ. Technol. 21(5) (2005) 737-742.
[14] D. Singh, R.K. Gupta, V. Kumar, Simulation of a plant scale reactive distillation column for esterification of acetic acid, Comput. Chem. Eng. 73(2015) 70-81.
[15] R. Kumar, S.M. Mahajani, Esterification of Lactic Acid with n -Butanol by Reactive Distillation, Ind. Eng. Chem. Res. 46(21) (2007) 6873-6882.
[16] M.A. Santaella, A. Orjuela, P.C. Narváez, Comparison of different reactive distillation schemes for ethyl acetate production using sustainability indicators, Chem. Eng. Process. 96(2015) 1-13.
[17] Z. Qi, K. Sundmacher, E. Stein, A. Kienle, A. Kolah, Reactive separation of isobutene from C4 crack fractions by catalytic distillation processes, Sep. Purif. Technol. 26(2002) 147-163.
[18] A.M. Katariya, R.S. Kamath, K.M. Moudgalya, S.M. Mahajani, Non-equilibrium stage modeling and non-linear dynamic effects in the synthesis of TAME by reactive distillation, Comput. Chem. Eng. 32(10) (2008) 2243-2255.
[19] Y. Fang, W. Xiao, Experimental and modeling studies on a homogeneous reactive distillation system for dimethyl carbonate synthesis by transesterification, Sep. Purif. Technol. 34(1-3) (2004) 255-263.
[20] T. Keller, A. Górak, Modelling of homogeneously catalysed reactive distillation processes in packed columns:Experimental model validation, Comput. Chem. Eng. 48(2013) 74-88.
[21] B. Guo, Y. Li, Analysis and simulation of reactive distillation for gasoline alkylation desulfurization, Wildl. Soc. Bull. 38(1) (2014) 43-50.
[22] L. Tong, L. Chen, Y. Ye, Z. Qi, Kinetic studies on the dimerization of isobutene with Ni/Al₂O₃ as a catalyst for reactive distillation process, Chin. J. Chem. Eng. 23(3) (2015) 520-527.
[23] J. Cheng, X. Li, C. Du, L. Liao, D. Li, Study on C5 separation with reaction distillation, Chem. Ind. Eng. Prog. 28(7) (2009) 1278-1281.
[24] L. Guo, D. Li, J. Wang, Simulation of reactive distillation process for separation of steam cracking C5, Petrochem. Technol. 43(12) (2014) 1394-1400.
[25] B. Tian, G. Tang, Q. Zhang, C. Du, W. Dai, Simulations of thermal dimerization and reactive distillation processes in separation of cyclopentadiene from steam cracking C5, Petrochem. Technol. 37(12) (2008) 1276-1281.
[26] H.J. Flammersheim, J. Opfermann, The dimerization of cyclopentadiene-A test reaction for the kinetic analysis of DSC measurements and the performance of a kinetic evaluation program, Thermochim. Acta 337(1-2) (1999) 149-153.
[27] L. Guo, T. Wang, D. Li, W. Jinfu, Intrinsic kinetic modeling of thermal dimerization of C5 fraction, Chin. Pet. Process Pe. Technol. 18(1) (2016) 92-99.
[28] J. Seo, J. Lee, H. Kim, Isothermal vapor-liquid equilibria for ethanol and n-pentane system at the near critical region, Fluid Phase Equilib. 172(2) (2000) 211-219.