Sensor technique for black liquor oxidation control

G - Physics – 01 – N

Patent

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G01N 21/05 (2006.01) G01N 21/33 (2006.01) G01N 21/55 (2006.01) G01N 33/34 (2006.01)

Patent

CA 2714988

A method for determining simultaneously from an oxidized black liquor sample an amount of sulfide, an amount of total dissolved solids, and an amount of effective alkali present in the sample, wherein the sulfide amount, the total dissolved solids amount, and the effective alkali amount are determined by subjecting the sample to attenuated total reflection (ATR) ultraviolet/visible (UWV) spectroscopy over a wavelength of from about 190 to about 500 nm. Black liquor is converted to oxidized black liquor in a first and second black liquor oxidation stages. Data from oxidized black liquor samples are used in a black liquor oxidation (BLOX) system for monitoring and controlling sulfur emissions from a kraft process.

L'invention concerne un procédé pour déterminer simultanément dans un échantillon de liqueur noire oxydée la quantité de sulfure, la quantité totale de matières solides dissoutes et la quantité d'alcalis efficaces présents dans l'échantillon en soumettant l'échantillon à une spectroscopie ultraviolet/visible (UV/Vis) par réflexion totale atténuée (ATR) sur un intervalle de longueurs d'ondes d'environ 190 à environ 500 nm. La liqueur noire est convertie en liqueur noire oxydée dans une première et une seconde étapes d'oxydation de liqueur noire. Les données obtenues sur ces échantillons de liqueur noire oxydée sont utilisées dans un système d'oxydation de liqueur noire (BLOX) pour suivre et contrôler les émissions de soufre issues d'un procédé kraft.

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