Influence of the Surface and Structural Characteristics of Activated Carbons on Adsorptive Removal of Halo-Olefinic Impurities from 1,1,1,3,3-Pentafluoropropane

doi:10.1016/j.cjche.2014.06.020

Abstract

Abstract: Halo-olefinic impurities in 1,1,1,3,3-pentafluoropropane (HFC-245fa) product used as blowing agents, etc. could damage the human body and must be removed. Activated carbon was treated by HCl, HNO3 and NaOH, respectively. The adsorptive performance of unmodified and modified activated carbons for the removal of a low content of 1-chloro-3,3,3-trifluoro-1-propene (HCFC-1233zd), 1,3,3,3-tetrafluoro-1-propene (HFC-1234ze), 1-chloro-1,3,3,3-tetrafluoro-1-propene (HFC-1224zb) and 2-chloro-1,3,3,3-tetrafluoro-1-propene (HFC-1224xe) halo-olefins in the 1,1,1,3,3-pentafluoropropane (HFC-245fa) product was investigated. These halo-olefinic impurities could be substantially removed from the HFC-245fa product via the adsorption over activated carbon when the adsorption temperature was under 333 K, which can be attributed to the π-π dispersion interactions between the halo-olefins and carbon graphite layer. The basic surface groups of activated carbon could catalyze the decomposition of HFC-245fa to formHFC-1234ze. However, the significant increase in the amount of surface acidic groups of activated carbon led to a distinct decrease of adsorption capacity due to the reduction in themicropore volume of adsorbent and a decrease in the strength of the π-π dispersive interactions between haloolefin molecules and carbon basal. The breakthrough time of halo-olefinic impurities on activated carbon increased with the increase of molecular mass and the decrease of molecular symmetry.

Key words: Adsorption, Removal, Halo-olefinic impurities, 1,1,1,3,3-Pentafluoropropane, Activated carbon

摘要： Halo-olefinic impurities in 1,1,1,3,3-pentafluoropropane (HFC-245fa) product used as blowing agents, etc. could damage the human body and must be removed. Activated carbon was treated by HCl, HNO3 and NaOH, respectively. The adsorptive performance of unmodified and modified activated carbons for the removal of a low content of 1-chloro-3,3,3-trifluoro-1-propene (HCFC-1233zd), 1,3,3,3-tetrafluoro-1-propene (HFC-1234ze), 1-chloro-1,3,3,3-tetrafluoro-1-propene (HFC-1224zb) and 2-chloro-1,3,3,3-tetrafluoro-1-propene (HFC-1224xe) halo-olefins in the 1,1,1,3,3-pentafluoropropane (HFC-245fa) product was investigated. These halo-olefinic impurities could be substantially removed from the HFC-245fa product via the adsorption over activated carbon when the adsorption temperature was under 333 K, which can be attributed to the π-π dispersion interactions between the halo-olefins and carbon graphite layer. The basic surface groups of activated carbon could catalyze the decomposition of HFC-245fa to formHFC-1234ze. However, the significant increase in the amount of surface acidic groups of activated carbon led to a distinct decrease of adsorption capacity due to the reduction in themicropore volume of adsorbent and a decrease in the strength of the π-π dispersive interactions between haloolefin molecules and carbon basal. The breakthrough time of halo-olefinic impurities on activated carbon increased with the increase of molecular mass and the decrease of molecular symmetry.

关键词: Adsorption, Removal, Halo-olefinic impurities, 1,1,1,3,3-Pentafluoropropane, Activated carbon

Bo Zhang, Chuang Zhang, MingquanWei. Influence of the Surface and Structural Characteristics of Activated Carbons on Adsorptive Removal of Halo-Olefinic Impurities from 1,1,1,3,3-Pentafluoropropane[J]. , 2014, 22(9): 974-979.

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