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Download fileNanofiltration - a method for solute removal from fuel simulants
conference contribution
posted on 2010-01-06, 12:52 authored by Steve Tarleton, J.P. RobinsonThe separation characteristics of a dense polydimethylsiloxane (PDMS) membrane were studied
using alkyl and aromatic solvents and low-polarity, sulphur bearing, organometallic (OM) and polynuclear
aromatic (PNA) solute compounds. Rejection was found to be dependent on transmembrane
pressure, crossflow rate (hydrodynamic conditions), solute size and the degree of
swelling induced by the solvent. Rejection increased progressively with pressure whilst a threshold
condition was observed above which further increases in crossflow had a negligible influence on
rejection. Measurements over the molecular weight range 84-612 g/mol showed the membrane to
have a cut-off in the region 350-400 g/mol to all but one of the tested PNA compounds (rubrene).
An additional correlation using molecular dimensions instead of molecular weight showed the cutoff
size to be in the region of 1-2 nm, with all data falling on a well defined rejection/size curve.
Solvent type influenced membrane swelling to an extent dependent on the relative magnitude of
the solubility parameters for the solvent and PDMS; similar values led to more swelling, higher
fluxes and lower rejections. Results support the concept of viscous solvent flow whilst solute
transport could be either predominantly viscous or a combination of viscous and diffusive. With
larger molecules a size exclusion mechanism was dominant.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Citation
TARLETON, E.S. and ROBINSON, J.P., 2005. Nanofiltration - a method for solute removal from fuel stimulants. American Filtration & Separations Society Diesel and Gas Emission Conference 2005, Ann Arbor, MI, September 19-22.Publisher
American Filtration & Separations SocietyVersion
- NA (Not Applicable or Unknown)
Publication date
2005Notes
This paper was presented at the Diesel and Gas Emission Conference 2005 (American Filtration & Separation Society: http://www.afssociety.org/)Language
- en