Method for the determination of lignin content of a sample by fl

Details Method for the determination of lignin content of a sample by fl Method for the determination of lignin content of a sample by fl

1988-06-06

1991-03-26

Warden, Robert J.

Chemistry: analytical and immunological testing

Oxygen containing

Carbonyl, ether, aldehyde or ketone containing

422 78, 422 89, 422 94, 73 231, 7386482, G01N 3346

Patent

active

050028944

ABSTRACT:
The lignin content of wood, paper pulp or other material containing lignin (such as filter paper soaked in black liquor) is more readily determined by flash pyrolysis of the sample at approximately 550.degree. C. in a reducing atmosphere of hydrogen or in an inert atmosphere of helium followed by a rapid analysis of the product gas by a mass spectrometer. The heated pyrolysis unit as fabricated comprises a small platinum cup welded to an electrically-heated stainless steel ribbon with control means for programmed short duration (1.5 sec, approximately) heating and means for continuous flow of hydrogen or helium. The pyrolysis products enter an electron-ionization mode mass spectrometer for spectral evaluation. Lignin content is obtained from certain ratios of integrated ion currents of many mass spectral lines, the ratios being linearly related to the Kappa number of Klason lignin.

REFERENCES:
patent: 3955924 (1976-05-01), Northmore et al.
patent: 4159894 (1979-07-01), Hu
Gardner et al., "The Pyrolytic Behavior of Selected Lignin Preparations", J. Wood Chem. Technol., L5Y1), 1985, pp. 85-110, (Abstract only).
Windig et al., "Biochemical Analysis of Wooded Wood Products by Pyrolysis-Mass Spectrometry and Multivariated Analysis", J. Appl. Pyrolysis, (6) (3), 1984, (Abstract only).
Obst, "Analytical Pyrolysis of Hardwood and Softwood Lignins and its use in Lignin-Type Determination of Hardwood Vessel Elements", J. of Wood Chemistry and Technology, 1983, (3) (4):377-397, (Abstract only).

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