Method for rapid determination of the contents of lignin, monosa

Details Method for rapid determination of the contents of lignin, monosa Method for rapid determination of the contents of lignin, monosa

1986-01-15

1988-01-12

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With testing, sampling or analyzing

162 61, 162 83, 436175, D21C 304, D21C 322

Patent

active

047189797

ABSTRACT:
A method for rapid determination of the contents of lignin, monosaccharides and organic acids in the process solutions of sulfite pulping. Accordingly, any non-ionized compounds that disturbs the measurement of these concentrations are separated from the lignin material by an ion-exclusion technique. The measurements of concentrations are carried out by means of the UV-method, refractive-index method, and/or by means of the polarimetric method. The method of the present invention is usable for the controlling of sulfite cooking or other pulping or by-product production processes as well as for the characterization of the spent liquor.

REFERENCES:
patent: 4086129 (1978-04-01), Conca et al.
Flashka et al, "Quantitative Analytical Chemistry, 2nd Ed."; Willard Grant Press; Boston, pp. 521-523; 1980.
Felicetta et al, "Spent Sulphite Liquor VII"; TAPPI, vol. 42, No. 6, Jun. 1959 pp. 496-502.
Shaw, "Determination of Sugars in Waste Sulphite Liquor", Can. Pulp & Paper, 10 (1957); 11, 49-50.
Patterson et al, "The Spectrophotometric Determination of Lignin in Sulphite Cooling" Pulp & Paper Canada, 11-1951, pp. 105-111.

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