Pervaporation Separation of Cyclopentadiene/Methylcyclopentadiene Mixtures from Cracking C5 Fractions Using Polyimide Membranes

Abstract:

Polyimide membrane pervaporation was introduced to separate the costly diene mixtures of cyclopentadiene/methylcyclopentadiene (CPD/MCPD) from cracking C5 fractions. Four kinds of membrane solutions were prepared and two kinds of polyimide homogenous membranes were fabricated by thermal imidizations using the dianhydrides (BPADAand PMDA) and the diamines (ODA and DDS). The effect of the casting solutions viscosity on the membrane formation was revealed, and the formation of functional groups and the synthesis mechanisms of the thermal imidizations were indicated by FT-IR. The adsorption behaviors and the pervaporation performances were studies for BPADA-ODA and PMDA-ODA membranes. The results show that the permeation fluxes are 164g∙m^-2∙h^-1 and 4.2g∙m^-2∙h^-1 for BPADA-ODA and PMDA-ODA membranes respectively, while the separation factor are 1.93 and 8.9 for these two membranes respectively. 88.5 wt% concentration of MCPD was achieved in the circulated feed side ultimately.

• Periodical: Advanced Materials Research (Volume 1096)
• Pages: 397-401
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1096.397
• Online since: April 2015
• Authors: Jin Qing Chen, Hong Ling Lv*, Ya Qi Yao, Bing Chen
• Keywords: Cyclopentadiene/Methylcyclopentadiene, Permeation Flux, Pervaporation, Polyimide Membrane, Separation Factor

References

[1] R X Valenzuela, J M Asperilla, V C Corberan. Isoprene and C5 Olefins Production by Oxidative Dehydrogenation of IsopentaneInd. Eng. Chem. Res., 47(2008) 8037-8042.

DOI: 10.1021/ie800756p

[2] M Y Huang, J C Wu, F S Shieu, , J J Lin. Preparation of high energy fuel JP-10 by acidity-adjustable chloroaluminate ionic liquid catalyst. Fuel, 90 (2011) 1012-1017.

DOI: 10.1016/j.fuel.2010.11.041

[3] Tian B L, Li P Y, Xu C P, et. al. Process for separating C5 cuts obtained from a petroleum cracking process[P]. 2005. 10, USA US6958426 B2.

[4] Hosseini S S, M R Omidkhah, A Z Moghaddam, V Pirouzfar, W B Krantz, N R Tan. Enhancing the properties and gas separation performance of PBI–polyimides blend carbon molecular sieve membranes via optimization of the pyrolysis process. Sep. Purif. Technol., 122(2014).

DOI: 10.1016/j.seppur.2013.11.021

[5] F W Lu, Y Kong, H L Lv, J R Yang. The removal of thiophene from n-heptane/thiophene mixtures by polyethylene glycol-block- polyacrylonitrile membranes. Sep. Purif. Technol., 30(2012) 1232-1238.

DOI: 10.1080/10916466.2010.503213

[6] S Sha, Y Kong, H L Lv, J R Yang. Effect of charge-transfer complex between gasoline components/C60 on desulphurization properties of C60-filled ethyl cellulose hybrid membranes. J Membr. Sci. 415-416(2012) 835-841.

DOI: 10.1016/j.memsci.2012.06.001

[7] C Y Ba, J Economy. Preparation of PMDA/ODA polyimide membrane for use as substrate in a thermally stable composite reverse osmosis membrane. J Membr. Sci. 363(2010) 140-148.

DOI: 10.1016/j.memsci.2010.07.019