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1. Brine Preparation & Purification System
Converts raw salt into purified NaCl solution for electrolysis.
Equipment: Salt dissolving tanks, clarification units, chemical dosing, filtration, ion exchange.
Removes Impurities: Ca²⁺, Mg²⁺, SO₄²⁻, heavy metals.
Protects ion exchange membrane & maintains efficiency.
2. Membrane Electrolysis System (Core)
Produces: Sodium hydroxide (NaOH), Chlorine gas (Cl₂), Hydrogen gas (H₂)
Components: Cells, ion exchange membranes, anode/cathode chambers, DC power, circulation.
Benefits: High current efficiency, low salt consumption & emissions, stable quality.
3. Caustic Soda Concentration Unit
Evaporates dilute NaOH (30–32%) to final concentration: 45–50% NaOH
Equipment: Multi-effect evaporators, heat exchangers, circulation pumps, vacuum systems.
4. Chlorine Treatment
Cools, dries, compresses and stores anode chlorine gas.
Uses: PVC, HCl production, water treatment.
5. Hydrogen Treatment
Collects, cools, separates and monitors cathode hydrogen gas.
Uses: Industrial fuel, HCl feedstock, process gas.
Complete caustic soda production plants can be designed according to project requirements.
Common capacities include:
| Plant Capacity | Application |
|---|---|
| 10,000 TPA | Small chemical production facility |
| 50,000 TPA | Regional chemical plant |
| 100,000 TPA | Medium-scale chlor-alkali project |
| 200,000+ TPA | Large industrial chemical complex |
(TPA = Tons Per Annum)
FAQ：
1. What is included in a Complete Caustic Soda Production Plant?
It includes all major process units required for sodium hydroxide production, including:
Salt dissolving and brine preparation system
Brine purification unit
Membrane electrolysis system
Chlorine treatment system
Hydrogen treatment system
Caustic soda concentration unit
Product storage system
Electrical and automation control system
Utility systems
The plant is designed as an integrated production facility that converts salt and water into caustic soda, chlorine, and hydrogen.
2. What is the production process of a caustic soda plant?
A caustic soda plant mainly uses the chlor-alkali membrane electrolysis process.
The production steps include:
Salt is dissolved in water to produce brine.
Brine is purified to remove calcium, magnesium, and other impurities.
Purified brine enters the membrane electrolyzer.
Direct current electricity splits sodium chloride into sodium hydroxide, chlorine, and hydrogen.
The NaOH solution is concentrated to the required commercial concentration.
The overall chemical reaction is:
2NaCl + 2H₂O → 2NaOH + Cl₂ + H₂
3. Why is membrane technology used in modern caustic soda plants?
Ion exchange membrane technology is widely used because it separates the anode and cathode chambers while allowing sodium ions to pass through.
Main advantages include:
High caustic soda purity
Lower salt consumption
Reduced energy consumption compared with older technologies
No mercury contamination
Stable continuous operation
Most newly built industrial chlor-alkali plants use membrane cell technology.
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