In a gas scrubber, the scrubbing liquid absorbs certain gaseous, liquid or solid components from the gas stream. The circulating scrubbing liquid must be kept in the range of the maximum absorption. In order to ensure an effective absorption of the phosgene in the gas scrubber, the concentration of NaOH, NaCl and of Na2CO3 must be monitored.
If the NaOH content is under limit, it must be redosed. If the content of the salt is too high, salt is removed from the circulation, since it would otherwise crystallize in the system.
The LiquiSonic® 40 analyzer allows the concentration measurement in 3-components-liquids. Due to the parallel detection of two physical quantities such as sonic velocity and conductivity, two concentration values can be determined simultaneously: the scrubbing liquid and the salts NaCl and Na2CO3. This allows a better response to concentration fluctuations in the srubbing liquid.