Determination of the endpoint for preparing sodium hypochlorite by absorbing chlorine with liquid caustic
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Chlorinated exhaust gases contain hydrogen chloride and chlorine; they are first absorbed with water to form hydrochloric acid, and then absorbed with liquid alkali in two stages to form sodium hypochlorite. So, for determining the end point of absorption, is it by taking samples at regular intervals and sending them to the laboratory for testing, or are there other methods available in the workshop to determine the end point?
Online detection of the effective chlorine content of the free base in hyposodium can effectively determine the end point of the reaction; feel free to contact us if needed. 18615997765
Hydrogen chloride is hydrogen chloride, and chlorine is chlorine; the former cannot be absorbed by a base to produce sodium hypochlorite, right?
First, hydrogen chloride is absorbed by water; chlorine does not dissolve in water. It is chlorine that is introduced into the alkaline solution, not hydrogen chloride
Here, we analyze the alkali concentration in the main tower once per shift, and the concentration in the secondary tower once a day; when the alkali concentration is below 1%, we analyze the available chlorine content