Chlorine Bleach Wood Pulp

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

Chlorine bleach wood pulp. In the production of paper residual lignin from wood pulp is chemically liberated by using chlorine bleaching forming chlorinated lignin derivates such as chlorolignols. Pulp and paper industry currently uses chlorine dioxide bleaching also known as elemental chlorine free or ecf. Elemental chlorine free ecf is a technique that uses chlorine dioxide for the bleaching of wood pulp. For example the use of elemental chlorine in the bleaching of wood pulp produces organochlorines and persistent organic pollutants including dioxins.

It has been found that bleaching can result in the formation of dioxin in the pulp when chlorine reacts with organic constituents of wood. Bleaching wood subtract color to add life. According to an industry group the use of chlorine dioxide in these processes has reduced the dioxin generation to under detectable levels. Read on to find out what each one does and how to use them safely.

These are toxic carcinogenic and recalcitrant to degradation. Elemental chlorine free ecf. Chlorine is commonly used as a bleach. Two part bleach changes the actual color of wood and the other three remove stains.

There are four types of bleach that woodworkers commonly use. 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. Chlorine two part wood bleach oxalic acid and peroxide.

In this process the wood pulp s color is enlightened and whiten. It is used at moderately acidic ph 3 5 to 6. For over four decades we have helped the industry navigate the changing landscape of bleaching technologies. Recently paper makers have begun using chlorine dioxide to bleach paper.

Traditionally the paper industry used chlorine gas to bleach pulp. Although preliminary surveys have detected dioxin in pulp mill wastes the scope of the problem is not yet known. As a core component of best available technique bat for production of pulp paper and board ecf bleaching will likely continue to dominate. 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. The process of doing it is called bleaching of wood pulp which is a chemical process. 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.