Thermogravimetry/mass spectrometry of various lignosulfonates as well as of a kraft and acetosolv lignin

E. Jakab, F. Till, T. Székely, O. Faix

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Thermal decomposition of kraft lignin, acctosolv lignin and various lignosulfonates has bcen studied comparatively to a spruce MWL using thermogravimetry/mass Spectrometry (TG/MS) in the temperature ränge from 30°C to 950°C in inert gas atmosphere applying 20°C/min hcating rate. The mass of the samples was measured as a function of the temperature and the intensity profiles of 14 molecular and fragment ions of the degradation products (H2, CH3 +, H2O, CO2, CO, CHO+, HCHO, CH3O+, CH3CO+, H2S, CH3S+, SO2, CH3COOH, guaiacol) were simultaneously recorded. Under these circumstances the thermal decomposition of lignins is a relatively slow charring process accompanied by the evolution of high amounts of voiatile products with low molecular masses. The amounts of degradation products and their distribution were highly specific for the samples. This can be explained by the differences in the functional groups andash contents. The presence of organically bonded cations in the lignosulfonates, especially that of sodium, has a major effcct on the decomposition mechanism facilitating the dehydration and de-carboxylation reactions. Thus, salts of lignosulfontates give rise preferentially to H2O, CO2, CO and to chars with high yield. On the other hand, the evolution of organic gases with low molecular masses is suppressed. TG/MSis well suited to the description of the thermal behaviour of technical lignins.

Original languageEnglish
Pages (from-to)355-360
Number of pages6
JournalHolzforschung
Volume45
Issue number5
DOIs
Publication statusPublished - 1991

Fingerprint

Lignin
Mass spectrometry
Thermogravimetric analysis
Molecular mass
Carbon Monoxide
Pyrolysis
Carboxylation
Guaiacol
Noble Gases
Degradation
Dehydration
Functional groups
Cations
Inert gases
Salts
Gases
Sodium
Ions
Decomposition
Temperature

Keywords

  • Acetosolv lignin
  • ASAM lignin
  • Charring
  • Gasification
  • Kraft lignin
  • Lignosulfonates
  • Spruce MWL
  • TG/MS
  • Thermal analysis
  • Thermogravimetry/ mass Spectrometry

ASJC Scopus subject areas

  • Biomaterials

Cite this

Thermogravimetry/mass spectrometry of various lignosulfonates as well as of a kraft and acetosolv lignin. / Jakab, E.; Till, F.; Székely, T.; Faix, O.

In: Holzforschung, Vol. 45, No. 5, 1991, p. 355-360.

Research output: Contribution to journalArticle

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AB - Thermal decomposition of kraft lignin, acctosolv lignin and various lignosulfonates has bcen studied comparatively to a spruce MWL using thermogravimetry/mass Spectrometry (TG/MS) in the temperature ränge from 30°C to 950°C in inert gas atmosphere applying 20°C/min hcating rate. The mass of the samples was measured as a function of the temperature and the intensity profiles of 14 molecular and fragment ions of the degradation products (H2, CH3 +, H2O, CO2, CO, CHO+, HCHO, CH3O+, CH3CO+, H2S, CH3S+, SO2, CH3COOH, guaiacol) were simultaneously recorded. Under these circumstances the thermal decomposition of lignins is a relatively slow charring process accompanied by the evolution of high amounts of voiatile products with low molecular masses. The amounts of degradation products and their distribution were highly specific for the samples. This can be explained by the differences in the functional groups andash contents. The presence of organically bonded cations in the lignosulfonates, especially that of sodium, has a major effcct on the decomposition mechanism facilitating the dehydration and de-carboxylation reactions. Thus, salts of lignosulfontates give rise preferentially to H2O, CO2, CO and to chars with high yield. On the other hand, the evolution of organic gases with low molecular masses is suppressed. TG/MSis well suited to the description of the thermal behaviour of technical lignins.

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