What are the different methods of denying?

Delignification is a group of industrial processes where lignin, a natural cellular binding agent in wood during the wooden pulp production. Removing the lignin from wooden pulp designed for paper production is necessary to ensure the brightness and clarity of the paper product. Generally, there are several processes of denying, and the Kraft and Delignification process are the most common and often used in tandem. The Kraft process is a high temperature and pressure system of digestion that chemically decomposes lignin in wooden pulp. Oxygen -based lignin processes use oxygen activation to remove lignin and are often used as complementary steps in the Brownstock Phase in the Kraft process. It serves as a facilitator of a cell binder and hydration in plants, as well as a reempers separation during wood processing is a useful commercial product. However, Lignin is a problem when wood fibers are used to produce pulp for paper production. These include undesirable coloring whoRé requires the raw wood to be exposed to the process of delignification before distribution. Two primary processes used to remove lignin from wooden pulp are the kraft process and deny oxygen.

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Kraft process involves running of finely discarded wood through a high -temperature, high -pressure chemical hood system. Wood chips are inserted into the sulphide of sodium and sodium hydroxide in a heated pressure digestor vessel. This solution, also known as white liqueur, along with high pressure and temperature in the digestor, chemically dissolves the lignin into a solution of white liquid. This solution rich in lignin or brownstock is then to turn off Pumped and subjected to a multi -stage rehabilitation process that removes lignin and gains most of the original white liqueur for reuse. Kraft delignification is highly efficient and removes approximately 95% of the lignin in wooden pulp.

Delignification of oxygen jE oxidation process, which relies on oxygen activation to remove lignin from the washed wooden pulp. The oxygen process itself is not as effective as kraft distribution and removes only about 55% of the lignin. However, this is often used as a complementary tandem process for the traditional Kraft method. In these cases, the oxygenating process is combined during the Kraft Brownstock phase.