Physical solubility of hydrogen sulfide and carbon dioxide in alkanolamine solutions

Miscellaneous · Fri Jan 01 00:00:00 EST 1988

OSTI ID:6678943

Abu-Arabi, M K

The study was undertaken to develop a method that would make direct measurements of acid gases, hydrogen sulfide and carbon dioxide, physical solubilities in aqueous alkanolamine solutions possible. Hydrogen sulfide and carbon dioxide physical solubilities in 20, 35, and 50% by weight diethanolamine aqueous solutions were measured. The solubility measurements were made at acid gas partial pressure up to 1000 psia and temperatures of 80, 150, 240 F. The solubility of nitrous oxide in water and in protonated diethanolamine solution was also determined at 80 F. A method that allows for direct measurements of acid gases physical solubilities has been developed. The method eliminates amines reactivity with acid gases by protonating the amines prior to their contact with acid gases. CO{sub 2} physical solubility in aqueous DEA solutions occurs mainly in the water portion of the solution. Therefore, the physical solubility of CO{sub 2} in an aqueous amine solution must be corrected based on the fraction of water in the solution. However, H{sub 2}S physical solubility in aqueous DEA solutions is the same as H{sub 2}S solubility in water. At any acid gas partial pressure, the physical solubility of H{sub 2}S is higher than that of CO{sub 2} for the same solution concentration and for the same temperature. This is also true for their solubilities is pure water. The ratio of CO{sub 2} to H{sub 2}S physical solubility to N{sub 2}O solubility in aqueous DEA solutions is not the same as their ratio in pure water.

• Research Organization: Oklahoma State Univ., Stillwater, OK (USA)
• OSTI ID: 6678943
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
AMINES
SOLVENT PROPERTIES
CARBON DIOXIDE
SOLUBILITY
HYDROGEN SULFIDES
NITROUS OXIDE
PRESSURE DEPENDENCE
TEMPERATURE DEPENDENCE
WATER
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
HYDROGEN COMPOUNDS
NITROGEN COMPOUNDS
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ORGANIC COMPOUNDS
OXIDES
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