Chlorine Bleach Wood Pulp

It has been found that bleaching can result in the formation of dioxin in the pulp when chlorine reacts with organic constituents of wood.

Chlorine bleach wood pulp.

Chlorine is commonly used as a bleach. About 95 of all bleached kraft pulp is made using chlorine dioxide in ecf bleaching sequences. Chlorine dioxide ecf technology currently is the most important bleaching method worldwide. Recently paper makers have begun using chlorine dioxide to bleach paper.

Read on to find out what each one does and how to use them safely. Biobleaching is an important alternative to reduce the use of chlorine. Two part bleach changes the actual color of wood and the other three remove stains. The process of doing it is called bleaching of wood pulp which is a chemical process.

Pulp and paper industry currently uses chlorine dioxide bleaching also known as elemental chlorine free or ecf. Bleaching wood subtract color to add life. In the production of paper residual lignin from wood pulp is chemically liberated by using chlorine bleaching forming chlorinated lignin derivates such as chlorolignols. 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. Chlorine two part wood bleach oxalic acid and peroxide. Elemental chlorine free ecf. Although preliminary surveys have detected dioxin in pulp mill wastes the scope of the problem is not yet known.

There are four types of bleach that woodworkers commonly use. It does not use elemental chlorine gas during the bleaching process and prevents the formation of dioxins and dioxin like compounds carcinogens. According to an industry group the use of chlorine dioxide in these processes has reduced the dioxin generation to under detectable levels. Traditionally the paper industry used chlorine gas to bleach pulp.

It is used at moderately acidic ph 3 5 to 6. Bleaching is done to whiten the paper which makes text on it easier to read the chlorine produces several by products including dioxins and furans. The use of chlorine dioxide minimizes the amount of organochlorine compounds produced. In this process the wood pulp s color is enlightened and whiten.

For over four decades we have helped the industry navigate the changing landscape of bleaching technologies. Elemental chlorine free ecf is a technique that uses chlorine dioxide for the bleaching of wood pulp. These are toxic carcinogenic and recalcitrant to degradation.