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The use of nano-porous membranes for the physical separation of hydrogen sulfide (h2s) from methane in natural gas processing. The authors compare traditional methods of h2s separation, such as amine wash and oxide adsorbent, with the advantages of using nano-porous membranes. The document also covers the criteria for a good membrane, the mechanism of separation, and the process of making nanoporous membranes through self-ordering electrochemical process and cyclic anodization.
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from Chemical Engineering and Processing
removed before further processing^ ^ Starting levels can be high (>5%)^ ^ For US pipelines, limit is 4 ppm Traditionally done through chemical means One alternative is to use a nano-porousmembrane to achieve a physical separation^ Image Source: http://chemistry.about.com/od/factsstructures/ig/Chemical-Structures---H/Hydrogen-Sulfide.htm
, and 2 mercaptans Need a lot ofequipment Need both heating andcooling utilities
Image from http://en.wikipedia.org/wiki/Amine_gas_treating
Image from http://www.cwaller.de/sorbents.htm
H^2 SCH4H 2 S CH4CH4 HCH4 2 SH 2 S CH4FCH4L O W Nano-porousmembrane
Not to scale
SEPARATION FACTOR Where ^ x^ = mole fraction in the pore ^ y^ = mole fraction in the bulk
a^ ćand
Zoran Jakšić^ http://www.sciencedirect.com “Self-ordered nanopore and nanotube platforms for drug deliveryapplications” by Dusan Losic & Spomenka Simovichttp://informahealthcare.com/doi/pdf/10.1517/17425240903300857?cookieSet=
-^ Data^ used^ showed
amine^ needed
to^ be^ replaced
slowly^ with^ a
fresh^ stream
because^ some
of^ it
leaves^ in^ the^
tail^ gas^ stream
-^ No^ info^ available
on^ the^ cost^ of
the^ nano‐porous membrane^ to
compare^ with
traditional^ methods
-^ The^ presentation
was^ right^ after
Dr.^ Seminario
did
a^ harsh^ critique
of^ a^ previous
presentation,
so
there^ was^ reason
to^ be^ nervous,
but^ we^ should have^ rehearsed
more.
-^ Thanks^ for
