|
authors |
Silvestre, AJD; Pereira, CCL; Neto, CP; Evtuguin, DV; Cavaleiro, JAS |
|
journal |
JOURNAL OF PULP AND PAPER SCIENCE |
|
author keywords |
eucalyptus globulus; black liquors; kraft pulping; extraction; organic compounds; sequential processing; diethyl ether; ethyl acetate |
|
keywords |
MASS-SPECTROMETRY; TRIMETHYLSILYL DERIVATIVES; GLC-MS; CARBOXYLIC-ACIDS; GAS-CHROMATOGRAPHY; LIGNIN MONOMERS; BIRCH WOOD; IDENTIFICATION; POLYSACCHARIDES; DELIGNIFICATION |
|
abstract |
An improved extraction procedure is proposed for estimating the low-molecular-weight organic compounds in kraft black liquors. Black liquor from E. globulus pulping was sequentially extracted with diethyl ether at pH 12, 7 and 2, followed by ethyl acetate at pH 2. Two samples of industrial black liquors collected two months apart and showing similar basic parameters were analyzed. The total extraction yields were in the range 31-33 g/L and the weight percentages of compounds detected on the GC-MS analysis in the range 32-41%. About 90 different compounds, arising essentially from lignin and carbohydrate degradation were identified. The GPC analysis of the remaining non-volatile fraction (noneluted in the GC column) showed that it is composed mainly of lignin dimers and trimers. The advantage of such a sequential extraction scheme are discussed. |
|
publisher |
PULP & PAPER TECHNICAL ASSOCIATION CANADA |
|
issn |
0826-6220 |
|
year published |
2000 |
|
volume |
26 |
|
issue |
12 |
|
beginning page |
421 |
|
ending page |
427 |
|
web of science category |
Materials Science, Paper & Wood |
|
subject category |
Materials Science |
|
unique article identifier |
WOS:000166231700001
|
