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Brine purification Chlor-Alkali-Elektrolyse

Dependence of sound velocity on NaCl concentration

The chlor-alkali electrolysis is one of the most important processes in the chemical industry. The most important basic materials, chlorine and caustic soda, are produced. Today, 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 brine production is leaching the rock salt deposits in mines. The brine obtained can be transported through pipelines to the destination.

Use of LiquiSonic® in chlor-alkali electrolysis

The brine extracted from the mines is transported to the destination using ships, trains, or special pipelines and dissolved there in large dissolving vessels with warm water.
The raw brine contains mechanical impurities and calcium or magnesium salts that clog the fine pores of the diaphragm or membrane during electrolysis.
For this reason, these impurities are precipitated in agitated 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 particularly important for the subsequent electrolysis. The LiquiSonic® measurement system ensures highly precise determination of the salt concentration at all times.

Advantages of monitoring brine purification with LiquiSonic®

The continuous concentration measurement directly in the process reduces elaborate laboratory measurements.

  • Time savings: approx. 1 hour per day
  • Amortationszeit: < 12 Monaten

Through the exact determination of the purity of the brine using LiquiSonic® measurement technology the following aspects can be optimized:

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

Installation 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

Download Chlor-Alkali Electrolysis

Brine purification

Application report

Brine purification