Chlor-Alkali Plant
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Keywords:
ENGINEERING CASE
Chlor-alkali Chemical Industry
Caustic Soda Plant
Product details
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The core of a chlor-alkali plant (using the mainstream ion-exchange membrane process as an example) is to produce chlorine, alkali, and hydrogen through electrolysis using refined salt water. The process can be summarized into four key steps, each focusing on key actions:
1. Raw material pretreatment: Converting crude salt into "clean salt water"
Crude salt (industrial salt) is dissolved in fresh water to form crude brine, which is first filtered to remove sediment;
Chemical reagents (such as sodium carbonate and sodium hydroxide) are added to remove impurities such as calcium, magnesium, and sulfate from the brine to prevent clogging of the electrolytic membrane;
Finally, the "refined brine" is filtered and preheated to an appropriate temperature for use.
2. Core Electrolysis: Electricity is applied to separate the brine.
The refined brine is fed into an ion-exchange membrane electrolysis cell, where direct current is applied.
Anode: Chloride ions are converted to chlorine gas (discharged), and the remaining "brine" is recycled for reuse.
Cathode: Water molecules are converted to hydrogen gas (discharged), while a "crude caustic soda solution" containing sodium hydroxide is generated (discharged).
The ion-exchange membrane's function is to allow only sodium ions to migrate from the anode to the cathode, preventing the reaction of chlorine and caustic soda and the explosion of hydrogen and chlorine gas mixtures.
3. Product Purification: Converting the "crude product" into a qualified product.
Chlorine: Water and mist are first removed, then dried with concentrated sulfuric acid for direct use or liquefied storage.
Hydrogen: Residual caustic soda is washed away and, after drying, can be used as fuel, used to produce hydrochloric acid, or purified to a high purity for external supply.
Caustic soda: The crude caustic soda solution is concentrated (to remove excess water and residual salt) to produce a 48%-50% liquid caustic soda solution, which can then be further processed into solid flakes with a purity exceeding 99%. 4. Recycling and Environmental Protection: Reducing Losses and Pollution
The "brine water" remaining after electrolysis is dechlorinated and returned to the "raw material pretreatment" stage for re-salting.
Wastewater generated during production (such as wash water) is partially recycled after neutralization and treatment, with the remainder meeting discharge standards.
Impurity precipitates (such as salt sludge) are dehydrated and sent to specialized disposal facilities.
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