The partial conversion of certain lignin model compounds (vanillin, guaiacol, and veratrole) to peroxides by the action of aqueous ClO2 was established. The possible mechanism of such reactions as well as the significance of peroxide intermediates in the bleaching and delignification processes of ...
The molecule then absorbs light in the ultraviolet region, and no color is produced. Chlorine bleaches react with more chromophores than oxygen bleaches. The mechanism of bleaching of hydrogen peroxide is not well understood. It is generally believed that the perhydroxyl an 展开 关键词:...
The chemistry of bleaching agents is predominantly that of oxidizing agents: chlorine (Cl2) and some of its compounds or peroxygen species such as hydrogen peroxide (H2O2), ozone (O3), and sodium perborate (NaBO3 ∙ nH2O; n = 1–4). The decolorizing reaction generally involves the remova...
A Pretreatment with Nitrous Acid for Oxygen Bleaching of Kraft Pulp and Its Bleaching Mechanism (NODP) bleaching of beech pulp with nitrous acid pretreatment (N), oxygen (O), chlorine dioxide (D), and hydrogen peroxide (P) gives pulps with ... H Ohi,M Tajiri,Y Iwanaga,... - 《Japan...
Chapter3 Bleaching Chapter3Bleaching Prof.Dr.Yankelu 3.1Intruction •Scouringgenerallyremovesallimpuritiesexceptthenaturalcolouringmatterswhichhavetobebrokendownbybleaching,eitherwithanoxidizingorareducingagent.Almostinvariablytheoxidizingagentsgiveamorepermanent.Whenthecolourisacteduponbyareducingagent,thereisalwaysthe...
Comparative studies were carried out on the kinetics and mechanism of pulp biobleaching with laccase-mediator system (LMS) with two different mediators, 1-... Balakshin,Chen,CL,... - J MOL CATAL B-ENZYM 被引量: 69发表: 2001年 review and assessment of the ecological risks associated with ...
Proposed Mechanism of the Enzymatic Bleaching of Kraft Pulp with Xylanases The modification of fibre surface by an enzymatic pretreatment was studied by analyzing the hydrolysis products released from the pulps and the molar mass ... A Kantelinen,B Hortling,J Sundquist,... - 《Holzforschung》 ...
6.Preparation of AOBS and the Study of Application and Mechanism in Chlorine-Free Bleaching Pulp;AOBS的研制及其在纸浆无氯漂白中的应用及机理研究 7.Soda-CT-1 Additive Pulping and TCF Bleaching of Bagasse with Black Liquor Pretreatment;蔗渣黑液预煮烧碱-CT-1助剂法制浆与全无氯漂白的研究 ...
The chlorine bleaching technology, which was identified as main formation mechanism of PCDD/Fs, is still widely used by the vast majority of non-wood PMs in Southeast Asia, India and China (Oanh, 1996, Thacker et al., 2007, Rolf et al., 2009). We conducted a detailed survey on the ...
Total Chlorine Free BleachingThis paper summarizes the review of developments in the area of ozone-based elemental chlorine free (ECF) and total chlorine free (TCF) bleaching of wood and non-wood pulps. Focused areas of review are reaction mechanism of ozone with carbohydrates and lignin, effect...