Multicomponent hydrogen/hydrocarbon separation by MFI-type zeolite membranes

Junhang Dong, Jerry Lin, Wei Liu

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

Separation of an eight-component simulated refinery gas mixture including hydrogen (~ 84 mol %) and light hydrocarbons (C1 - C4, 7.5 ~ 0.3 mol %) by α-alumina-supported polycrystalline MFI zeolite membranes was studied at 25 - 500 °C and feed pressures of 0.1 - 0.4 MPa. The zeolite membrane showed excellent separation properties for rejection of hydrogen from the hydrogen/hydrocarbon mixture at < 100 °C. At room temperature and atmospheric pressure on both feed and permeate sides, hydrogen permeation rate is almost zero, while the hydrocarbon permeation rate is 2 - 4 x 10-4 mol · m-2 · s-1. The zeolite membrane outperforms the microporous carbon membrane in terms of both selectivity and permeance for hydrocarbons over hydrogen. At 500 °C the zeolite membrane becomes permselective for hydrogen over hydrogen (C1 - C4). In the whole temperature range iso-butane is nonpermeable (with a permeance below the GC analysis limit) through the zeolite membrane. Separation results of the zeolite membrane can be characterized by a solution-diffusion model considering competitive adsorption of hydrocarbons over hydrogen and configurational diffusion in the zeolite pores. The MFI-type zeolite membranes showed promise for applications in separation processes for hydrogen concentration/purification from various hydrogen/hydrocarbon mixtures (at lower temperatures) and in membrane reactors for dehydrogenation reactions (at high temperatures).

Original languageEnglish (US)
Pages (from-to)1957-1966
Number of pages10
JournalAICHE Journal
Volume46
Issue number10
StatePublished - Oct 2000
Externally publishedYes

Fingerprint

Zeolites
Hydrocarbons
Hydrogen
Membranes
Temperature
Permeation
Permselective membranes
Atmospheric Pressure
Aluminum Oxide
Butane
Dehydrogenation
Gas mixtures
Adsorption
Atmospheric pressure
Purification
Alumina
Carbon
Gases

ASJC Scopus subject areas

  • Biotechnology
  • Chemical Engineering(all)
  • Mechanical Engineering
  • Environmental Engineering
  • Polymers and Plastics

Cite this

Multicomponent hydrogen/hydrocarbon separation by MFI-type zeolite membranes. / Dong, Junhang; Lin, Jerry; Liu, Wei.

In: AICHE Journal, Vol. 46, No. 10, 10.2000, p. 1957-1966.

Research output: Contribution to journalArticle

Dong, Junhang ; Lin, Jerry ; Liu, Wei. / Multicomponent hydrogen/hydrocarbon separation by MFI-type zeolite membranes. In: AICHE Journal. 2000 ; Vol. 46, No. 10. pp. 1957-1966.
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