How is NaCl removed during the production of sodium hypochlorite solutions?
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Sodium hypochlorite solutions are primarily prepared by passing chlorine gas into NaOH solution; however, in this reaction process, for every 1 mol of NaClO produced, 1 mol of NaCl is also formed. So how is NaCl removed during actual production? What is the removal rate?
In the actual production process, NaCl is not removed, let alone there being a removal rate.
It can’t be removed, right? Try to control the temperature during the absorption process, as this will significantly reduce the rate of salt formation.
This is unavoidable; our company has experienced multiple instances of salt buildup in the pipelines, resulting in poor ventilation. What temperature level would be ideal for control?
It depends on each company’s regulations; our rule is that it cannot exceed 40 degrees, with the value generally kept between 20 and 30 degrees
There are many reasons for salt accumulation in the system; it could be due to an excessively high concentration of alkali, self-decomposition of sodium hypochlorite caused by prolonged storage, too high reaction temperature, too fast chlorine introduction rate, or excessive local chlorine application that leads to a high reaction temperature, among other possibilities. Under normal circumstances, the system should be cleaned after a few cycles.
The removal process was not carried out; the salt accumulation is due to the high concentration of NaOH you used, as well as the failure to clean the tower in a timely manner. If the reaction temperature is high, the effective chlorine content in hypochlorite will be very low, and this effective chlorine is lost even faster during summer!