Category Archives: pulp bleaching

Hydrogen peroxide bleaching

Posted on July 4, 2016 by admin

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 →

Posted in pulp bleaching, Pulp Mill | Tagged , , , | 4 Comments

Chlorine dioxide bleaching

Posted on February 28, 2016 by admin

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 →

Posted in pulp bleaching, Pulp Mill | Tagged , , , , , | 6 Comments

Hypochlorite bleaching

Posted on January 31, 2016 by admin

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 →

Posted in pulp bleaching, Pulp Mill | Tagged , , , , , | 5 Comments

Alkaline extraction stage for pulp bleaching

Posted on December 11, 2015 by admin

Alkaline extraction stage is essential after chlorination bleaching stage is to remove chlorinated and oxidizing lignin products from the pulp. It is also help to reactivate the remaining lignin for the next oxidation stage. All the chlorinated lignins are not … Continue reading →

Posted in pulp bleaching | Tagged , , | 7 Comments

Chlorination bleaching process

Posted on September 21, 2015 by admin

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 →

Posted in pulp bleaching, Pulp Mill | Tagged , , , | 2 Comments

Oxygen delignification process

Posted on July 28, 2015 by admin

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 →

Posted in Lignin, pulp bleaching, Pulp Mill | Tagged , , , , , , | 17 Comments

Pulp Bleaching Sequences

Posted on April 29, 2015 by admin

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 , , , , | 1 Comment

What is bleaching of pulp

Posted on March 26, 2015 by admin

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 , , | 1 Comment