Chlorine Bleach Wood Pulp

Biobleaching is an important alternative to reduce the use of chlorine.

Chlorine bleach wood pulp.

Chlorine two part wood bleach oxalic acid and peroxide. Ecf is a pollution prevention technology recognized and accepted globally by such organizations as the united nations environment. The use of chlorine dioxide minimizes the amount of organochlorine compounds produced. It is used at moderately acidic ph 3 5 to 6.

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. Elemental chlorine free ecf is a technique that uses chlorine dioxide for the bleaching of wood pulp. Traditionally the paper industry used chlorine gas to bleach pulp. About 95 of all bleached kraft pulp is made using chlorine dioxide in ecf bleaching sequences.

It does not use elemental chlorine gas during the bleaching process and prevents the formation of dioxins and dioxin like compounds carcinogens. Ecf bleaching is the worldwide bleaching standard despite tcf being 100 chlorine free. 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. In this process the wood pulp s color is enlightened and whiten.

Elemental chlorine free ecf. According to an industry group the use of chlorine dioxide in these processes has reduced the dioxin generation to under detectable levels. Recently paper makers have begun using chlorine dioxide to bleach paper. It has been found that bleaching can result in the formation of dioxin in the pulp when chlorine reacts with organic constituents of wood.

For example the use of elemental chlorine in the bleaching of wood pulp produces organochlorines and persistent organic pollutants including dioxins. For over four decades we have helped the industry navigate the changing landscape of bleaching technologies. Although preliminary surveys have detected dioxin in pulp mill wastes the scope of the problem is not yet known. Bleaching wood subtract color to add life.

Pulp and paper industry currently uses chlorine dioxide bleaching also known as elemental chlorine free or ecf. Read on to find out what each one does and how to use them safely. 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.

These are toxic carcinogenic and recalcitrant to degradation. Chlorine is commonly used as a bleach. The process of doing it is called bleaching of wood pulp which is a chemical process.