Dendrimer liquid membranes: CO2 separation from gas mixtures

A. Sarma Kovvali, K. K. Sirkar

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A generation 0 poly(amidoamine) (PAMAM) dendrimer in the immobilized liquid membrane (ILM) configuration was studied using flat films and hollow fibers for CO2-N2 separation. This dendrimer as a pure liquid functions as a CO2-selective molecular gate with highly humidified feed gas (Kovvali et al. J. Am. Chem. Soc. 2000, 122, 7594). The present work broadens the range of relative humidity of the feed gas stream (RHf) by adding a small amount of glycerol to the pure dendrimer liquid. A 75% dendrimer-25% glycerol ILM was found to increase the operating range of RHf substantially while maintaining the CO2 permeance and the selectivity (αCO2/N2) close to the levels observed with a pure dendrimer ILM. The performances of pure and 75% dendrimer ILMs were found to be superior or comparable to the highest reported αCO2/N2'S. This behavior is explained in terms of the charged environment in the dendrimer liquid membrane under humidified feed conditions and facilitated transport of CO2.

Original languageEnglish (US)
Pages (from-to)2502-2511
Number of pages10
JournalIndustrial and Engineering Chemistry Research
Issue number11
StatePublished - May 30 2001

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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