2024-03-29T12:38:19Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/344852018-09-12T07:37:03Zcom_10261_15com_10261_6col_10261_268
Analysis of pitch deposits produced in Kraft pulp mills using a totally chlorine free bleaching sequence.
Río Andrade, José Carlos del
Romero, Javier
Gutiérrez Suárez, Ana
Eucalyptus globulus
Wood
Pyrolysis
Kraft pulp
Pitch
Derivatization
Pyrolysis
Sterols
Sterol esters
Tetramethylammonium hydroxide
11 páginas, 4 tablas, 5 figuras. E-mail address: delrio@irnase.csic.es (J.C. del Río)
Two organic deposits accumulated in a Kraft pulp mill during pulping of Eucalyptus globulus wood and throughout a TCF
(totally chlorine free) bleaching sequence were characterized. One deposit was collected after cooking and an oxygen
delignification stage while the other was collected after bleaching with hydrogen peroxide. The deposits were Soxhlet
extracted with acetone, and the extracts redissolved in chloroform and subsequently analyzed by gas chromatography (GC)
and GC–mass spectrometry (MS) using short and medium length high temperature capillary columns, respectively. On the other hand, the insoluble residues left after the acetone extraction were analyzed by Curie-point flash pyrolysis–GC–MS and by pyrolysis–methylation–GC–MS. The compounds identified in the deposits arise from the E. globulus wood lipophilic extractives that survive the pulping and bleaching processes. Triglycerides were completely hydrolyzed during the Kraft cooking and the fatty acids dissolved. Steroids (alcohols, hydrocarbons, ketones and esters) and waxes were the main
components in the deposit collected after the oxygen delignification stage. After the bleaching with hydrogen peroxide, content of the waxes were reduced and fatty acids appeared. High amounts of fatty acids salts were also identified in the deposit collected after the oxygen stage, and in minor amounts in the deposit collected after hydrogen peroxide bleaching. In contrast, this deposit was mainly made up of high amounts of lignin-derived phenolic moieties.
2011-04-11T11:10:00Z
2011-04-11T11:10:00Z
2000
artículo
Journal of Chromatography A 874: 235-245 (2000)
0021-9673
http://hdl.handle.net/10261/34485
10.1016/S0021-9673(00)00111-4
eng
http://dx.doi.org/10.1016/S0021-9673(00)00111-4
openAccess
Elsevier