Preparation Method Of Sodium Thiosulfate Pentahydrate
Oct 31, 2021
1. Sodium sulfite method: After dissolving soda ash, it reacts with sulfur dioxide (generated by burning sulfur) to generate sodium sulfite, then adding sulfur for boiling reaction, filtering, concentrating, and crystallization to obtain sodium thiosulfate.
2. Sodium sulfide method: the sodium sulfide evaporation residue, sodium carbonate and sodium sulfide in the barium sulfide wastewater react with sulfur dioxide in the sulfur waste gas, through sulfur absorption, evaporation, and crystallization, to obtain sodium thiosulfate.
3. Oxidation, sodium sulfite and recrystallization method: sodium thiosulfate is mixed with sodium sulfite, sodium sulfite and caustic soda liquid after sulfuration and oxidation; sodium bisulfite is sulfurized and crude sodium thiosulfate recrystallized , Concentrate and crystallize to obtain sodium thiosulfate.
4. Recrystallization method: dissolve crude sodium thiosulfate crystals (or use crude sodium thiosulfate solution), remove impurities, concentrate, and crystallize to obtain sodium thiosulfate.
5. Arsenic-alkali method to purify gas by-product method: use the bottoms (including) in the process of coke oven gas arsenic-alkali desulfurization, after suction filtration, concentration and crystallization, to obtain sodium thiosulfate.
