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100,000 TPA means the plant is designed to produce 100,000 metric tons of caustic soda per year.
Actual annual output depends on: Operating hours, Electrolyzer efficiency, Power availability, Maintenance schedule, and Product concentration requirements.
Working Principle
Based on the ion exchange membrane chlor-alkali electrolysis process. Purified brine enters the electrolyzer, where direct current electricity drives the separation while the membrane prevents cross-reaction to ensure high purity.
Main Process Units
1. Brine Preparation and Purification System
Dissolves raw salt into saturated brine and removes impurities to protect membrane cells and enhance stability.
Equipment: Salt dissolving/brine storage tanks, chemical precipitation units, clarifiers, sand filters, ion exchange systems.
Impurities Controlled: Calcium (Ca²⁺), Magnesium (Mg²⁺), Iron (Fe³⁺), Sulfate (SO₄²⁻).
2. Membrane Electrolysis Unit (Core Section)
Converts electrical energy into chemical energy to separate NaCl into NaOH solution, chlorine, and hydrogen gas.
Components: Anode/cathode chambers, ion exchange membranes, electrode assemblies, brine/caustic circulation loops.
Directly affects: NaOH production capacity, power consumption, product concentration, and operating cost.
3. Caustic Soda Concentration System
Concentrates the initial 30–32% NaOH output from the electrolyzer up to commercial grade via evaporation.
Equipment: Falling film evaporators, heat exchangers, steam circulation, vacuum equipment, product pumps.
4. Chlorine Processing System
Cools, dries (via sulfuric acid), compresses, and handles simultaneous co-product chlorine gas.
Applications: PVC, hydrochloric acid, sodium hypochlorite, water disinfection chemicals.
5. Hydrogen Processing System
Safely collects, cools, separates, and controls pressure for gas generated on the cathode side.
Applications: Hydrochloric acid production, industrial fuel, chemical synthesis processes.
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 the production capacity of a 100,000 TPA Caustic Soda Plant?
It is designed to produce 100,000 metric tons of sodium hydroxide annually through the chlor-alkali membrane electrolysis process.
2.What products are produced in a 100,000 TPA chlor-alkali plant?
The plant produces:
Sodium hydroxide (NaOH)
Chlorine gas (Cl₂)
Hydrogen gas (H₂)
These products are generated simultaneously during electrolysis.
3.What technology is used in a 100,000 TPA caustic soda plant?
Modern 100,000 TPA plants generally use ion exchange membrane electrolysis technology due to its ability to produce high-purity NaOH with controlled energy consumption.
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