Sodium hydroxide Mainly used for the following purposes:
Refinement of petroleum -The oil products that have been cleaning by sulphuric acid also contain some acid sodium. So it has to use sodium hydroxide solution to wash it, and water scrubbing, then can be refined products.
Making paper-The raw material of paper is wood or of grass type of plant. Except fiber, the plants also contain a number of Non-cellulose such as cellulose gum and lignin. And the dilute sodium hydroxide solution have the function of dissolving fiber elements and separating, and then get the paper pulp that major componer of fiber.
Textile-The man-made fibers such as manmade cotton, wool, manmade rayon fabric are mostly sticky tape. They are using fiber such as paper pulp, sodium hydrogen, carbon bisulfide as raw material that made of sticky tape which is spraying, and make it to jell.
Printing and Dyeing- Cotton that dealed with Sodium hydroxide solution have been removed the wax, grease, faceula that covering on cotton, increased the light color in dyeing silk and more evenly.
The manufacture of soap-The main componet of soap is rfatty acid sodium salt, usually made of grease and as sodium hydroxide materials through saponification.