G - Physics – 01 – N
Patent
G - Physics
01
N
150/19
G01N 30/96 (2006.01) D21C 7/12 (2006.01) G01N 21/33 (2006.01) G01N 30/02 (2006.01) G01N 33/00 (2006.01)
Patent
CA 1253061
Abstract of the Disclosure The invention relates to a method of rapid determination of the concentrations of the total sulphur dioxide and the lignosulphonate present in sulphite pulping process liquors. According to the invention the lignosulphonates are separated from compounds which form the total sulphur dioxide by means of an ion exclusion column, whereby the filling material of the column consists of a cation exchange resin. The concentration measurements of the sulphur dioxide and the lignosulphonate are carried out from the liquor flow coming out from the separation column by means of UV- method at the wave length of 280 nm. The invention also relates to a method of controlling the pulping process by determining the total sulphite dioxide concentration in the pulping liquor.
469623
Tikka Panu
Virkola Nils E.
Johnson Douglas S. Q.c.
Oy Advanced Forest Automation Ab
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