Pulp and Paper: Chemistry and Chemical Technology, Volume 1 |
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Page 456
... color and heat . Lignin is the main offender as far as color is concerned . Cellulose and the hemicelluloses are inherently white . The principal bleaching and purifying agents used are chlorine , chlorine dioxide , and hypochlorite ...
... color and heat . Lignin is the main offender as far as color is concerned . Cellulose and the hemicelluloses are inherently white . The principal bleaching and purifying agents used are chlorine , chlorine dioxide , and hypochlorite ...
Page 467
... color rever- sion . Overbleaching results in a degradation of the cellulose , thereby making it more susceptible to color change . Giertz28b lists decomposed carbohydrates , rather than lignin or resins , as the chief cause of ...
... color rever- sion . Overbleaching results in a degradation of the cellulose , thereby making it more susceptible to color change . Giertz28b lists decomposed carbohydrates , rather than lignin or resins , as the chief cause of ...
Page 483
... color removal in these pulps . Freshly made sulfate pulp has a light brown , grayish color , but upon contact with air , it becomes oxidized to a dark brown color which is difficult to decolorize . The coloring agents act as an indica ...
... color removal in these pulps . Freshly made sulfate pulp has a light brown , grayish color , but upon contact with air , it becomes oxidized to a dark brown color which is difficult to decolorize . The coloring agents act as an indica ...
Contents
Types of Cellulose | 1 |
Copper Number | 14 |
Internal Sizing | 16 |
Copyright | |
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agent alkali alkaline pulping amount aspen bark bisulfite black liquor bleachability bleaching brightness bursting strength calcium carbohydrates caustic cells Chem chips chlorine dioxide color commercial concentration consumption contains cooking liquor deinking delignification density digester dilute dissolved effect evaporation extraction free sulfur dioxide freeness furnace gases grades green liquor grinder grinding groundwood hardwoods heat hemicelluloses higher hypochlorite increase kraft lignin lignin content lignosulfonic lime liquor ratio method mills molecule obtained oxide Paper Ind Paper Trade papermaking pentosans permanganate number peroxide pine pressure produced Pulp Paper Mag pulping processes reaction recovery reduced refining removed resin screening semichemical pulps soda process sodium carbonate sodium chlorite sodium hydroxide sodium sulfite softwoods soluble solution species spruce stage steam stone straw sulfate process sulfite cooking sulfite pulp sulfonation sulfur dioxide sulfuric acid tall oil Tappi temperature tion titration tower tracheids unbleached viscosity washing waste weight wood pulps yield