Using raman spectroscopy to control carbonate / bicarbonate...

G - Physics – 01 – J

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G01J 3/44 (2006.01) G01N 21/65 (2006.01)

Patent

CA 2730029

An apparatus and method of controlling carbonate/bicarbonate concentrations and ratio in a chemical process having the steps of flowing a carbonate/bicarbonate solution through a measurement cell (202), exposing the solution to laser light of suitable wavelength and power (204); measuring the intensity of the scattered light using Raman spectroscopy (206); calculat-ing the concentration of carbonate and bicarbonate from the intensity of the scattered light (208); and sending the measurement results to a programmable logic controller (210) to be used to control the ratio of carbonate and bicar-bonate in the solution through adjusting process parameters. The method is useful in both carbon dioxide absorption processes and carbonate/bicarbonate regeneration processes.

La présente invention concerne un appareil et un procédé permettant d'établir les concentrations de carbonate/bicarbonate et leur rapport dans un processus chimique qui comprend les étapes suivantes: écoulement d'une solution de carbonate/bicarbonate dans une cellule de mesure (202), exposition de la solution à de la lumière laser d'une longueur d'onde et d'une puissance appropriées (204); mesure de l'intensité de la lumière diffusée par spectroscopie Raman (206); calcul de la concentration de carbonate et de bicarbonate à partir de l'intensité de la lumière diffusée (208); et envoi des résultats de la mesure à un automate programmable (210) devant servir à établir le rapport du carbonate et du bicarbonate dans la solution, par un ajustement des paramètres du processus. Ce procédé est utile aussi bien dans les processus d'absorption du dioxyde de carbone que dans les processus de régénération du carbonate/bicarbonate.

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