Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing
Patent
1987-03-09
1989-08-01
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
048530840
ABSTRACT:
A method for controlling the alkaline delignification processes, especially the sulphate process of wood or other materials containing cellulose by the interdepending concentrations of the hydroxymonocarboxylic acids which are formed in the process and dissolved into the waste liquor. According to the method a sufficient number of representative waste liquor samples are taken during the process and the acids present in the samples are analyzed by gas chromatography. Thus, the required time interval for achieving the desired cooking stage can be determined by using the interdepending ratios of the concentrations of certain acids.
REFERENCES:
Kleinert et al., "Short Wavelength Ultraviolet Absorption of Alkali-Lignin; a Means of Control in Kraft Cooking . . . "; TAPPI, vol. 41(7), p. 372; 7-1958.
Kleinert et al., "Short Wavelength Ultraviolet Absorption of Various Lignins and Related Substances", Pulp and Paper Magazine of Canada, p. 154, Apr. 1957.
Aronovic et al., "Determination of Low Molecular Weight Organic Acids in Pulping Liquors", TAPPI, vol. 54(10), p. 1693, Oct. 1971.
Alen Raimo
Sjostrand Eero
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