WebIt is used as such in some industrial dyeing processes to eliminate excess dye, residual oxide, and unintended pigments and for bleaching wood pulp. Reaction of sodium dithionite with formaldehyde produces … WebThe use of calcium and sodium hypochlorites to bleach paper stock dates from the beginning of the 19th century. In the early days of sulfite pulp manufacture, a single …
Papermaking - Processes for preparing pulp Britannica
WebMay 7, 2009 · Mixed enzyme preparation having both xylanase and laccase activity was evaluated for its bleach enhancing ability of mixed wood pulp. The enzyme was … WebNov 25, 2024 · On an industrial scale, it’s used to bleach wood pulp and to prepare other types of bleaching agents, like perborates and percarbonates. Sodium percarbonate: This is an adduct of two chemicals, namely hydrogen peroxide and sodium carbonate. When dissolved in water, sodium percarbonate produces a solution that can simultaneously be … official bungie website
Amazon.com: Wood Bleach
WebWe are well-positioned as one of the world’s leading producers of northern bleached softwood and hardwood kraft pulp (NBSK and NBHK) to meet the growing demand for natural, fibre-based goods with our sustainably produced products. All of our mills utilize a process to ensure we have elemental chlorine-free (ECF) pulp, resulting from the use of … Bleaching of wood pulp is the chemical processing of wood pulp to lighten its color and whiten the pulp. The primary product of wood pulp is paper, for which whiteness (similar to, but distinct from brightness) is an important characteristic. These processes and chemistry are also applicable to the … See more Brightness is the amount of incident light reflected from paper under specified conditions, usually reported as the percentage of light reflected, so a higher number means a brighter or whiter paper. In the US, the See more Mechanical pulp retains most of the lignin present in the wood used to make the pulp and thus contain almost as much lignin as they do cellulose and hemicellulose. It would be … See more Chemical pulps, such as those from the kraft process or sulfite pulping, contain much less lignin than mechanical pulps, (<5% compared to approximately 40%). The goal in … See more • Johan Richter – inventor of the continuous process for bleaching wood pulp • Paper chemicals See more Hydrogen peroxide and sodium dithionite are used to increase the brightness of deinked pulp. The bleaching methods are similar for mechanical pulp, in which the goal is to make the fibers brighter. See more The bleaching of chemical pulps has the potential to cause significant environmental damage, primarily through the release of … See more WebOct 1, 2003 · Practically, pulp bleaching is a process that makes the final product whiter or brighter. Technically, bleaching a pulp decreases the visible light absorbance or … myelination and myelinization