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Category Archives: Pulp Mill
Kappa number of pulp
The Kappa number of pulp is an indication of the lignin content or bleachability of pulp. We use it to estimate the required amount of bleach chemicals to achieve targeted brightness. If the kappa number value is higher then, the … Continue reading
Hydrogen peroxide bleaching
Hydrogen peroxide is a total chlorine free (TCF) bleaching agent. It is appropriate for chemical, mechanical and recycled pulp to achieve a wide range of brightness. It has both oxidizing and reducing properties which is pH depended. The chemical formula … Continue reading
Chlorine dioxide bleaching
Chlorine dioxide is an oxidizing agent for pulp bleaching. The chemical formula of this chlorine dioxide bleach is ClO2. It is a yellowish-green gas, bad odor and liquefied in 11⁰C which is red in color. It is an ECF (elemental … Continue reading
Hypochlorite bleaching
Hypochlorite bleach is an oxidizing agent. There are two types of hypochlorite bleaching agent that are used in pulp and paper industries such as calcium hypochlorite and sodium hypochlorite. Generally, this stage is placed after chlorination and alkali extraction stages. … Continue reading
Chlorination bleaching process
Chlorination bleaching is the second stage of the pulp bleaching process. It is the cheapest bleaching agent for eliminating lignin. Elemental chlorine (EC) reacts selectively with the non carbohydrate compounds. It is another significant delignification process. It ruptures the lignin … Continue reading
Oxygen delignification process
Oxygen Delignification is one of the most significant and well proven pulp bleaching process for ECF (elemental chlorine free) and TCF (total chlorine free) bleached pulp production. It is the first stage of the bleaching process; in this case oxygen … Continue reading
The chemical reactions in Kraft pulping process
Kraft pulping process is the most used pulping process in the world. In this process lignin goes into the reactions with the cooking liquor chemicals and split into fragment. These fragments dissolved with the solution and wood disintegrates into fiber. … Continue reading
Posted in Lignin, Pulp Mill, Pulping Process
Tagged chemical pulp, kraft lignin, kraft pulp process, kraft pulping, Kraft pulping process, pulping process
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Lignin structure, properties, function and uses
Lignin is an aromatic complex polymer of monolignols (aromatic alcohols) which is found in plant cell walls. Later than cellulose, lignin is the most abundant natural polymer in the planet. It is not composed of carbohydrate monomers whereas the rest … Continue reading
Pulp Bleaching Sequences
Globally, there are several bleaching sequences are shown in different pulp mills to achieve the bleaching action. Different chemicals are used in each stage usually with washing between two stages to removes products. The preference of bleaching sequences depends on … Continue reading
Posted in pulp bleaching, Pulp Mill
Tagged bleaching, bleaching of pulp, bleaching sequence, bleaching sequences, pulp bleaching
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What is bleaching of pulp
The objective of pulp bleaching is to produce white pulp. Unbleached pulps are not suitable for manufacturing of high grade of white paper. Since all the processing pulp brightness is very low, especially Kraft pulp. The sulfite pulping process produces … Continue reading
Posted in pulp bleaching, Pulp Mill
Tagged bleached pulp, bleaching of pulp, pulp bleaching
1 Comment
