Technology introduction：

Use sulfur as raw material, burning with air in the sulfur incinerator, and get sulfur dioxide (SO₂) containing of flue gas, through chemical process to purification and get pure SO₂ gas. The pure sulfur dioxide gas is dividing into two fluids, one SO₂ fluid is absorbed by cold methanol to get SO₂-CH₃OH solution, another SO₂ fluid is feeds into sodium carbonate solution to get sodium metabisulfite solution. Batching sodium formate solution, and then put sodium metabisulfite solution and sodium formate solution into synthesis reactor as a certain ratio, and add ethylene oxide at the same time, and then continue adding SO₂-CH₃OH solution until the reaction end point, get sodium hydrosulfite solution. Through centrifugal separation and drying, get sodium sulfite product.

Quality Index: Quality Stand: GB1886.46-2015

Core technology advantages:

• Safe and reliable sulfur dioxide production process.

• Perfect heat recycles design. Recovery of the waste heat of sulfur incineration to get steam, the steam is used in the production. The design great reduced the cost of steam supply.

• The sodium hydrosulfite plant adopts well-developed process, so the products quality is very good and stabile.

• The drying equipment was improved (patent equipment), with high safety. The plant adopts well-developed synthesis reaction, preparation, and neutralization reaction equipment (special equipment), it's operation stable, and improve raw material yield.

• Recovery of sodium formate from distillation residue, and re-used for sodium hydrosulfite production, improved raw material yield and reduced pollution emissions.

• Recycling condensed water of distillation residue concentration, reducing the amount of wastewater discharge, SO₂ concentration in waste gas is less than 100mg/Nm³.

• Years of proven experience in establish sodium hydrosulfite plant, we ensure establish of the plant will fast and successful, and we ensure the plant once successful start-up.

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