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Aqueous carbon dioxide monitor
| Details |
Inventors: Connolly, Dennis J.;
Assignee: The Babcock & Wilcox Company (New Orleans, LA)
Primary Examiner: Warden; Robert J.
Assistant Examiner: Alexander; Lyle A.
Attorney, Agent or Firm: Matas; Vytas R., Edwards; Robert J., Kalka; Daniel S.
An apparatus and method for the measurement of low levels of carbon dioxide in a sample employing membrane separation and ion-exchange technology. The difference in acid strength of carbonic acid and other acids is exploited by first treating the sample with a weak base in a membrane separator and then with a strong base in the membrane separator. In this manner, the carbonic acid is distinguished from the stronger acids. By converting carbonic acid to sodium carbonate, the conductivity level is enhanced facilitating more precise measurements. |
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DETAILED DESCRIPTION The present invention solves the aforementioned problems by providing a method and apparatus for measuring low levels of carbon dioxide dissolved in water.
The present invention utilizes membrane separation and trans-membrane ion exchange techniques to exploit the difference in acid strength between carbonic acid (aqueous carbon dioxide) and other acids typically found in cation exchange effluent.
Accordingly, the present invention provides a method and apparatus for measuring low levels of carbon dioxide dissolved in water.
In a first embodiment, the sample is passed through cation exchange resin.
This effluent is treated with first a weak base (for example, sodium sulfate) for producing a first solution of which the conductivity is measured.
The first solution contains the sodium salts of strong acids with carbonic acid being substantially unreacted.
This first reaction occurs in a membrane separator which keeps the reactants separate while allowing cations to exchange.
A valve means then allows a strong base (for example, sodium hydroxide) to pass through the membrane separator to convert the carbonic acid in the first solution to sodium carbonate.
The conductivity of this second solution is measured.
The carbon dioxide concentration is determined from the change in conductivity.
In the preferred embodiment, a sample representing the cation exchange column effluent is passed through a first membrane separator where it is treated with a weak base.
The solution exiting the first membrane separator consists of the sodium salts of the strong acids but the remaining carbonic acid is unaffected.
Prior to entering the first membrane separator, the conductivity of the sample may be measured.
The solution exiting the first membrane separator has its conductivity measured.
Next, the sample enters a second membrane separator where it is treated with a strong base to convert the carbonic acid to sodium carbonate.
The conductivity is then measured as the second solution exits the second membrane separator
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