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Testing and Optimization of Nano Particles Reinforced PVAm/PVA Blend FSC Membranes for High Pressure Natural Gas Sweetening

Sørheim, Anders
Master thesis
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8383_FULLTEXT.pdf (49.71Mb)
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http://hdl.handle.net/11250/2351913
Utgivelsesdato
2012
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  • Institutt for kjemisk prosessteknologi [658]
Sammendrag
Employing gas separation membranes for natural gas sweetening is a cheaper,

simpler, more energy ecient and an environmentally friendly alternative to

separate CO2 from methane. Signicant advances has been made in membrane

science and technology over the last couple of decades, and especially

novel polymer-based FSC membranes have the potential of commercialization

in the natural gas treatment industry.

In this master's thesis, a selection of nanoparticle reinforced PVAm/PVA

blend FSC membranes have been prepared and tested at high pressure for

natural gas sweetening. An ultra-thin selective layer was prepared from commercial

polyvinyl amine (PVAm) and polyvinyl alcohol (PVA) and incorporated

with either carbon nanotubes or fumed silica, and was cast on the

support materials polysulfone (PSf), polyvinylidene

uoride (PVDF) and cellulose acetate (CA). Permeation tests were carried out at a high pressure

pilot scale membrane permeation rig, and the eect of pressure up to 80 bar

was investigated. The permeate gas composition was analyzed with a gas

chromatograph, and for a total of 11 dierent membranes, the CO2 permeance

and CO2/CH4 selectivity was calculated. Scanning electron microscopy

was employed to analyze the morphology of the membranes.

Several preparational conditions such as nanoller concentration, solution

ltration and selective layer thickness were explored and yielded good results.

One membrane in particular showed both high permeance and selectivity at

high pressures, with a CO2/CH4 selectivity of 26.9 and a CO2 permeance of

0.034 m3(STP)/m2.h.bar at 60 bar and 30C, with a feed gas

ow rate of 0.120 m3/h. The mechanical strength from the nanocomposite PVAm/PVA

selective layer with an average thickness 0.670 m on a PSf support showed

good permeability and high selectivity for high pressures.
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