Glycerol-based immobilized liquid membranes for olefin-paraffin separation

A. Sarma Kovvali, Hua Chen, Kamalesh K. Sirkar

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


The separation of olefin-paraffin mixtures is an important and expensive operation in the petrochemical industry. Facilitated transport membranes for olefin-paraffin separation have been extensively studied in the literature in an effort to provide an economic and efficient technology for this important application. In the present work, a glycerol-based silver nitrate solution is employed for the selective separation of 1-butene over n-butane in an immobilized liquid membrane (ILM) configuration having a dry sweep gas flowing on the permeate side. The silver nitrate concentration in glycerol was studied up to 7.5 M; the 1-butene and n-butane concentrations were studied up to 10% each in the feed gas mixture. These ILMs were studied in a flat membrane substrate for their extended-term stability to variations in the feed relative humidity among other parameters. The silver nitrate-glycerol ILMs were quite stable and provided reasonable permeabilities for 1-butene with selectivities for 1-butene over n-butane as high as 850. The effective permeance of 1-butene and its selectivity increased with increasing silver nitrate concentration in the glycerol solution.

Original languageEnglish (US)
Pages (from-to)347-356
Number of pages10
JournalIndustrial and Engineering Chemistry Research
Issue number3
StatePublished - Feb 6 2002

All Science Journal Classification (ASJC) codes

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


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