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Application Of Oxygen In Paper And Pulp Industry

Computers and electronics are used worldwide as a means of communication in the modern world.But it still hasn't made a dent in the production of pulp and paper in the world, and the demand for pulp and paper continues to rise.The industry has high capital costs, and also drains natural resources (trees).Manufacturers in the industry, therefore are always under pressure to maximize cost and processing efficiency, while reducing the burden on the environment wherever possible.Oxygen, is indispensable in the processing of paper and pulp, which has led to the escalating growth of oxygen gas plant manufacture in india, as well as the sale of oxygen generators and oxygen plant for industrial purposes.Application of oxygen in various industries oxygen, apart from being necessary for our survival, has various uses in different industries.For example, it is used in delignification in the paper and pulp industry, which will be discussed in the article later, but also in bleaching and ozone production.Oxygen also helps in increasing the capacity of the chemical recovery boiler or lime kiln.It is also useful in the forestry sector, for wastewater disinfection and treatment, as well as odour removal.Oxygen delignification oxygen delignification is a necessary part of pulp and paper production, and is partly the first stage of bleaching, in both ecf (elemental chlorine free) and tcf (total chlorine free) bleaching.It provides much benefit in production cost.Oxygen delignification is called so because it is the process of removing part of the residual lignin left in pulp after cooking (the first process of pulp manufacture), and is done using oxygen and alkali.There are many advantages of oxygen delignification, which include: it provides additional delignification after cooking at higher selectivity than continued cooking, which was used previously for delignification.Results in reduced emissions from the bleach plant results in reduced consumption of bleaching chemicals higher brightness ceiling in a given bleaching sequence lower shives (incompletely cooked wood fibres) content reduced extractives content maintained pulp strength facilitates system closure well proven technology, suitable for future process changes.In the oxygen delignification stage, the pulp is treated with oxygen in a pressurised vessel at elevated temperatures in an alkaline environment.The delignification may vary in the range of 40-70% depending on the wood raw material and whether one or two reactors in series are used.Unbleached pulp has a lignin content of 3-5%, which after oxygen delignification, can be decreased to about 1.5%.

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