Bleachability improvement of eucalypt mechanical pulps using …
网页Various pulp brightness levels and changes of residue chemicals in the spent bleaching liquors were investigated. Compared to water medium, the net brightness gain notably increased when using the E/W medium at the same chemical dosages.
Pulp Bleaching - an overview | ScienceDirect Topics
网页Pulp bleaching is the process of treating wood pulps with chemical agents to increase their brightness by removing lignin and altering chromophores, resulting in stronger fiber bonding for paper production. AI generated definition based on: Biermann's Handbook of Pulp and Paper (Third Edition), 2018
Treatment of bleaching liquors by ozonation and ... - ResearchGate
网页2002年1月1日 · Kraft pulp mills have struggled with how to quantify black liquor carryover into the bleach plant. Current on-line kappa testing measures only lignin bound to the fiber from a washed pulp...
Analysis of Bleach Liquors - SpringerLink
网页Since the early 1970s, great efforts have been made in developing suitable analytical methods for the chemical characterization of the organic material in bleach liquors from kraft and sulfite pulp mills.
BLANKOPHOR® PCL - Tanatex Chemicals
网页BLANKOPHOR® PCL gives a high whiteness maximum if applied in reductive bleaching liquors. BLANKOPHOR® PCL meets the high standards of lightfastness, wet lightfastness and colorfastness to chlorinated water required by manufacturers of …
Size-exclusion chromatographic study of ECF and TCF softwood …
网页Ultrafiltration of bleaching liquors showed that high molecular weight fraction also included some low molecular weight compounds and vice versa. High polydispersity and high lignin content correlated with the amount of HMW material in ECF and TCF bleaching stages.
网页Bleach liquors are known to change in composition during storage, and ion chromatography should be able to characterize the decomposition by simultaneous determination of chlorine-containing anions. To test this ability, a labora-tory-prepared chlorine dioxide liquor was diluted 1:2500 with distilled water,
Hydrogen peroxide: stabilization of bleaching liquors
网页This work explores the behaviour of a standard biological treatment system when exposed to two of the most common residuals from novel bleaching processes: hydrogen peroxide and the chelant DTPA. The …
网页to be useful for characterizing bleach liquors and effluents from chlorine bleaching, elemental chlorine-free (ECF) bleaching, and TCF bleaching. The intention has been not only to provide the reader with a series of analytical procedures and references, but also to give a brief description of the back ground of the recommended methods.
Nature and properties of some chlorinated, lipophilic, organic ...
网页Nature and properties of some chlorinated, lipophilic, organic compounds in spent liquors from pulp bleaching. 1. Liquors from conventional bleaching of softwood kraft pulp