Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing
Patent
1988-04-15
1990-07-31
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With testing, sampling or analyzing
162 61, D21C 302, D21C 712
Patent
active
049448412
ABSTRACT:
A procedure for monitoring alkaline delignification, in particular kraft cooking, of wood or other cellulosic material with the aid of the mutually relative concentrations of the monomeric lignin hydration products which are formed in connection therewith and are dissolved in the spent liquor. According to the procedure, a sufficient number of representative spent liquor samples is taken during the cooking process which are analyzed by gas chromatography. On the basis of the concentration proportions of certain compounds which have been analyzed, that time period is determined in each instance which is required to reach the desired degree of delignification.
REFERENCES:
patent: 4853084 (1989-08-01), Alen et al.
Kleinert et al., "Short Wavelength Ultraviolet Absorption of Alkali-Lignin . . . " Tappi, vol. 41 (7), p. 372, 7-1958.
Kleinert et al., "Short Wavelength Absorption of Various Lignins and Related Substances"; Pulp and Paper Canada, p. 154, 4-1957.
Arunovic et al. "Determination of Low Molecular Weight Organic Acids in Pulping Liquors" Tappi, vol. (54), 10, p. 1963; 10-1971.
Raimo Alen
Sjostrom Eero
Alvo Steve
Kajaani Elektroniikka Oy
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