Some ways to manufacture sodium lignosulfonate

1) The calcium lignin sulfonate ion exchange;
2) In the pulping process, sodium carbonate or sodium hydroxide, calcium oxide, or a substituted calcium hydroxide. This method is relatively rare, because sodium carbonate or sodium hydroxide, is usually higher than the price of calcium oxide or calcium hydroxide.
With pulp mill waste as a raw material, there are three general methods of preparation.
Sulfite or bisulfate 1. bisulfite pulping of calcium contained in the pulp waste directly binding to lignin hydroxyl molecules generated lignin. Waste was added to 10% of the milk of lime, at (95 ± 2) ℃ heated 30 min. The calcified solution was allowed to settle, the precipitate was filtered off, washed with water and sulfuric acid. Filtered to remove the calcium sulfate. Then added to the filtrate Na2CO3, turn into calcium lignin sulfonate sodium. The reaction temperature is preferably 90 deg.] C, the reaction after 2 h, allowed to stand and filtered to remove calcium sulfate impurities. The filtrate was concentrated, cooling and crystallization products.
2. lye resulting pulp and paper waste as raw material. First of concentrated sulfuric acid was added to the waste of about 50%, followed by stirring 4 ~ 6 h. Then lime milk, by sedimentation, filtration, beating, acid, add sodium carbonate conversion, enrichment, drying products
3. The resulting grass pulping waste as raw material. 2 the same way.

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