EurekaMag.com logo
+ Site Statistics
References:
47,893,527
Abstracts:
28,296,643
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Dissociation of phenolic groups in kraft lignin at elevated temperatures


, : Dissociation of phenolic groups in kraft lignin at elevated temperatures. Holzforschung 54(5): 519-527

The dissociation of the phenolic groups in a polydisperse, low molecular weight kraft lignin (Indulin AT) was studied in alkaline aqueous solutions in the temperature interval 21-70 degrees C, using a UV-spectrophotometric method. It was found that at a constant concentration of hydroxide ions, the degree of dissociation was decreasing when the temperature was elevated.


Accession: 003408723

DOI: 10.1515/hf.2000.088

Submit PDF Full Text: Here


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Related references

Kaewtatip, K.; Menut, P.; Auvergne, R.; Tanrattanakul, V.; Morel, M-Helene.; Guilbert, S., 2010: Interactions of Kraft lignin and wheat gluten during biomaterial processing: evidence for the role of phenolic groups. The chemical interactions between Kraft lignin and wheat gluten under processing conditions were investigated by determining the extent of the protein network formation. To clarify the role of different chemical functions found in lignin, the effe...

Crestini, C.; D'Annibale, A.; Sermanni, G.G.; Saladino, R., 2000: The reactivity of phenolic and non-phenolic residual kraft lignin model compounds with Mn(II)-peroxidase from Lentinula edodes. Three phenolic model compounds representing bonding patterns of residual kraft lignin were incubated with manganese peroxidase from Lentinula edodes. Extensive degradation of all the phenolic models, mainly occurring via side-chain benzylic oxidat...

PENISTON.Q.P.; McCARTHY.J.L., 1948: Lignin; liberation of phenolic hydroxyl groups by alkaline cleavage of lignin sulfonic acids. Journal of the American Chemical Society 70(4): 1329-1332

Ni, Y.K.bes, G.; Van-Heiningen, A., 1995: Development of phenolic lignin during ClO2 bleaching of kraft pulp. The development of the phenolic lignin content in kraft pulp during ClO2 bleaching was quantitatively determined by the periodate oxidation method. The effect of hypochlorous acid, an intermediate formed during chlorine dioxide bleaching, was elim...

Villar, J.; Caperos, A.G.rcia-Ochoa, F., 2001: Oxidation of hardwood kraft-lignin to phenolic derivatives with oxygen as oxidant. A hardwood kraft lignin was oxidized in alkaline medium to obtain phenolic compounds (syringaldehyde, vanillin and its acids). To avoid lignin condensation, the lignin was precipitated from a black liquor with a calcium salt dissolved in a water s...

Villar, J.; Caperos, A.G.rcia-Ochoa, F., 1997: Oxidation of hardwood kraft-lignin to phenolic derivatives.nitrogenase and copper oxide as oxidants. A hardwood kraft lignin (obtained by precipitating an industrial black liquor with a solution of calcium salt in alcohol) was oxidized in alkaline medium to obtain phenolic compounds (syringaldehyde, vanillin, syringic acid and vanillic acid). Nit...

Faustino, Hélio.; Gil, N.; Baptista, Cília.; Duarte, A.Paula., 2011: Antioxidant activity of lignin phenolic compounds extracted from kraft and sulphite black liquors. The antioxidant activity of the phenolic compounds present in industrial black liquors obtained from the two cooking processes (kraft and sulphite) used in Portugal to produce Eucalyptus globulus pulp was evaluated. The black liquors treated at se...

Suparno, O.; Covington, A.D.; Phillips, P.S.; Evans, C.S., 2005: An innovative new application for waste phenolic compounds: use of Kraft lignin and naphthols in leather tanning. Degradation of Kraft lignin by using hemin and hydrogen peroxide was investigated to produce phenolic compounds. The degradation products were identified using spectroscopic methods and gas chromatography-mass spectrometry (GC-MS). 2-Methoxyphenol...

Crestini, C.; Saladino, R., 2000: Reactivity of phenolic and nonphenolic residual kraft lignin model compounds with Mn -peroxidase from Lentinula edodes. Abstracts of Papers American Chemical Society 219(1-2): CELL 164

Westin, M.; Simonson, R.; Ostman, B., 2001: Kraft lignin wood fiberboards - the effect of kraft lignin addition to wood chips or board pulp prior to fiberboard production. Kraft lignin is a by-product of kraft pulping with great potential as an additive for wood composites. Kraft lignin was added to wood chips prior to defibration and alternatively to fibres to improve the properties of fibreboards. Lignin-wood fibr...