Method of determining degree of reduction in a sulfate liquor using IR and UV spectroscopy
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United States of America Patent
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Dec 10, 1996
Grant Date -
N/A
app pub date -
Sep 29, 1994
filing date -
Jan 9, 1992
priority date (Note) -
Expired
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Abstract
The invention relates to a method of determining the concentration of sulfide and optionally also of polysulfide in liquors and solutions of smelt deriving from the sulfate process. According to the method, the concentrations are determined by measuring the light absorption of the liquor or the solution in the ultra-violet range. According to one preferred embodiment, the method is applied to determine the degree of reduction in sulfate liquor and smelt derived from burning liquor, wherein the concentrations of sulfate, thiosulfate and optionally sulfite and/or carbonate are determined by measuring the light absorption of the liquor or the solution in the infrared range, whereafter the degree of reduction is calculated from the measuring data obtained.
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