1. Paper making: The raw materials for paper making are wood or grass plants, which contain not only cellulose, but also a considerable amount of non-cellulose (lignin, gum, etc.). Flake alkali is used for delignification. Only after the lignin in wood is removed can fiber be obtained. The non-cellulose components can be dissolved and separated by adding dilute caustic soda solution, so that the pulp with cellulose as the main component can be prepared.
2. Refined petroleum: after being washed with sulfuric acid, the petroleum products also contain some acidic substances, which must be washed with caustic soda solution and then washed with water to obtain refined products.
3. Textile: cotton and linen fabrics are treated with concentrated sodium hydroxide (caustic soda) solution to improve fiber properties. Man-made fibers, such as rayon, rayon, and rayon, are mostly viscose fibers. They are made from cellulose (such as pulp), flake alkali, and carbon disulfide (CS2) as raw materials, which are made into viscose solution, spun, and condensed.
4. Printing and dyeing: After cotton fabric is treated with flake alkali solution, it can remove wax, grease, starch and other substances covering the cotton fabric, at the same time, it can increase the mercerizing color of the fabric and make the dyeing more uniform.
