Chlorine Bleach Wood Pulp

About 95 of all bleached kraft pulp is made using chlorine dioxide in ecf bleaching sequences.

Chlorine bleach wood pulp.

The use of chlorine dioxide minimizes the amount of organochlorine compounds produced. Recently paper makers have begun using chlorine dioxide to bleach paper. Traditionally the paper industry used chlorine gas to bleach pulp. Chlorine dioxide serves as a bleaching agent for wood pulp and it is used because chlorine dioxide minimizes the amount of organochlorine compound that are produced in the process.

Ecf bleaching is the worldwide bleaching standard despite tcf being 100 chlorine free. Elemental chlorine free ecf. As a core component of best available technique bat for production of pulp paper and board ecf bleaching will likely continue to dominate. Ecf is a pollution prevention technology recognized and accepted globally by such organizations as the united nations environment.

Pulp and paper industry currently uses chlorine dioxide bleaching also known as elemental chlorine free or ecf. Bleaching wood subtract color to add life. Elemental chlorine free ecf is a technique that uses chlorine dioxide for the bleaching of wood pulp. According to an industry group the use of chlorine dioxide in these processes has reduced the dioxin generation to under detectable levels.

Chlorine is commonly used as a bleach. Although preliminary surveys have detected dioxin in pulp mill wastes the scope of the problem is not yet known. Read on to find out what each one does and how to use them safely. It is used at moderately acidic ph 3 5 to 6.

Chlorine two part wood bleach oxalic acid and peroxide. For over four decades we have helped the industry navigate the changing landscape of bleaching technologies. Chlorine dioxide ecf technology currently is the most important bleaching method worldwide. In the production of paper residual lignin from wood pulp is chemically liberated by using chlorine bleaching forming chlorinated lignin derivates such as chlorolignols.

It has been found that bleaching can result in the formation of dioxin in the pulp when chlorine reacts with organic constituents of wood. The process of doing it is called bleaching of wood pulp which is a chemical process. For example the use of elemental chlorine in the bleaching of wood pulp produces organochlorines and persistent organic pollutants including dioxins. Biobleaching is an important alternative to reduce the use of chlorine.

It does not use elemental chlorine gas during the bleaching process and prevents the formation of dioxins and dioxin like compounds carcinogens. Two part bleach changes the actual color of wood and the other three remove stains. In this process the wood pulp s color is enlightened and whiten.