Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing
Patent
1988-01-26
1989-12-26
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With testing, sampling or analyzing
162 61, 162 83, 210662, 436175, D21C 304, D21C 306, D21C 322, D21C 712
Patent
active
048895938
ABSTRACT:
A method of rapid determination of the concentrations of the total sulphur dioxide and the lignosulphonate present in sulphite pulping process liquors. 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 sulphite pulping process by determining the total sulphite dioxide concentration in the pulping liquor.
REFERENCES:
Haglund et al. "Spectrophotometric Determination of the Dissolution of Lignin During Sulfite Cooking", Tappi, May 1964, vol. 47, No. 5 pp. 286-291.
Felicetta et al., "Spent Sulphite Liquor VII", Tappi, vol. 42, No. 6 Jun. 1959.
Tikka Panu
Virkola Nils E.
Alvo Steve
Oy Advanced Forest Automation Ab
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