Caustic soda plays an important role in paper industry. Because of its alkaline properties, it is used in the process of cooking and bleaching paper. The raw material of paper making is wood or grass plants, which contain not only cellulose, but also quite a lot of non-cellulose (lignin, gum, etc.). The non-cellulose components can be dissolved and separated by adding dilute sodium hydroxide solution, and then the pulp with cellulose as the main component can be produced.
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