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Brine purification chlor-alkali electrolysis

Dependence of the speed of sound on NaCl concentration

Chlor-alkali electrolysis is one of the most important processes in the chemical industry. The main raw materials, chlorine and caustic soda, are produced. Nowadays, two processes are distinguished: the diaphragm and membrane process.
The starting product for chlor-alkali electrolysis is sodium chloride (NaCl, brine). The cheapest method for producing brine is leaching rock salt deposits in mines. The brine obtained in this way can be transported through pipelines to the destination.

Use of LiquiSonic® in chlor-alkali electrolysis

The brine obtained in the mines is transported to the destination by ship, rail, or special pipelines and is dissolved there in large dissolving vessels with warm water.
The raw brine contains mechanical impurities and calcium or magnesium salts, which clog the fine pores of the diaphragm or membrane during electrolysis.
For this reason, these impurities are precipitated in agitator tanks (dissolving vessels) by adding caustic soda (NaOH).
After precipitation, the impurities are separated using a pressure filter. The purity of the salt concentration is of particular importance for the subsequent electrolysis. LiquiSonic® Measuring system ensures a highly precise determination of the salt concentration at any time.

Advantages of monitoring brine purification with LiquiSonic®

Continuous concentration measurement directly in the process reduces complex laboratory measurements.

  • Time savings: approx. 1 hour per day
  • Payback period under 12 months

By accurately determining the purity of the brine using LiquiSonic® Measuring technology the following aspects can be optimized:

  • Membrane lifespan
  • Saving electrical energy (electrolysis)
  • Increase in overall process yield
  • Reduction of water or steam consumption (when dissolving the salt)

Integration in the electrolysis process

The LiquiSonic® 30 Sensors are installed in the main lines DN80 after the dissolving vessel or pressure filter.

Concentration range of NaCl: 0 to 30 m%
Temperature range: 0 to 100 °C

Determination of the salt concentration with the Liquisonic® measuring system and subsequent electrolysis

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Brine purification

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Brine purification