Chemical Process
H₂S is scrubbed from refinery gases by absorption using

Chilled water
Ethanol amine
Tri-butyl phosphate
Dilute H₂SO₄

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Chemical Process
Reverse osmosis is normally used for the

Separation of helium from natural gas
Separation of isotopes of uranium from gaseous uranium hexaflouride
Desalination of brackish water to produce potable (drinking) water
Purification of oxygen

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