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Title: Process for analyzing CO.sub.2 in seawater

Patent ·
OSTI ID:871027
 [1];  [2];  [3]
  1. Eugene, OR
  2. Roseburg, OR
  3. Yoncalla, OR
+ Show Author Affiliations

The process of this invention comprises providing a membrane for separating CO.sub.2 into a first CO.sub.2 sample phase and a second CO.sub.2 analyte phase. CO.sub.2 is then transported through the membrane thereby separating the CO.sub.2 with the membrane into a first CO.sub.2 sample phase and a second CO.sub.2 analyte liquid phase including an ionized, conductive, dissociated CO.sub.2 species. Next, the concentration of the ionized, conductive, dissociated CO.sub.2 species in the second CO.sub.2 analyte liquid phase is chemically amplified using a water-soluble chemical reagent which reversibly reacts with undissociated CO.sub.2 to produce conductivity changes therein corresponding to fluctuations in the partial pressure of CO.sub.2 in the first CO.sub.2 sample phase. Finally, the chemically amplified, ionized, conductive, dissociated CO.sub.2 species is introduced to a conductivity measuring instrument. Conductivity changes in the chemically amplified, ionized, conductive, dissociated CO.sub.2 species are detected using the conductivity measuring instrument.

Research Organization:
Umpqua Research Company (Myrtle Creek, OR)
DOE Contract Number:
FG03-93ER81641
Assignee:
Umpqua Research Company (Myrtle Creek, OR)
Patent Number(s):
US 5643799
OSTI ID:
871027
Country of Publication:
United States
Language:
English

References (14)

Kinetics of carbon dioxide absorption in aqueous solutions of diisopropanolamine journal April 1992
The solubility of H 2 S and CO 2 in aqueous monoethanolamine solutions journal December 1974
Absorption of carbon dioxide into asqueous solutions of triethanolamine journal August 1990
Solubility of hydrogen sulfide and carbon dioxide in aqueous methyldiethanolamine solutions journal October 1982
The solubility of carbon dioxide and hydrogen sulfide in a 35 wt% aqueous solution of methyldiethanolamine journal April 1993
Kinetics of CO2 with primary and secondary amines in aqueous solutions—II. Influence of temperature on zwitterion formation and deprotonation rates journal June 1992
A mathematical model for equilibrium solubility of hydrogen sulfide and carbon dioxide in aqueous alkanolamine solutions journal January 1981
Kinetics of CO2 with primary and secondary amines in aqueous solutions—I. Zwitterion deprotonation kinetics for DEA and DIPA in aqueous blends of alkanolamines journal June 1992
Approximate simulation of CO2 and H2s absorption into aqueous alkanolamines journal August 1993
Solubility and diffusivity data for the absorption of carbonyl sulfide, carbon dioxide, and nitrous oxide in amine solutions journal January 1992
Kinetics of Carbon Dioxide with tertiary Amines in aqueous solution journal November 1990
Correlation and Prediction of the Solubility of Carbon Dioxide in a Mixed Alkanolamine Solution journal August 1994
Vapor-Liquid Equilibrium of Carbon Dioxide in Aqueous Mixtures of Monoethanolamine and Methyldiethanolamine journal August 1994
Solubility of carbon dioxide and hydrogen sulfide in aqueous alkanolamines journal July 1993

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Related Subjects

process
analyzing
seawater
comprises
providing
membrane
separating
sample
phase
analyte
transported
liquid
including
ionized
conductive
dissociated
species
concentration
chemically
amplified
water-soluble
chemical
reagent
reversibly
reacts
undissociated
produce
conductivity
changes
therein
corresponding
fluctuations
partial
pressure
finally
introduced
measuring
instrument
detected
sample phase
comprises providing
measuring instrument
liquid phase
partial pressure
phase including
reversibly react
chemical reagent
changes therein
analyte phase
/436/73/422/