In the chlor-alkali process, there is severe turbidity in the effluent; the laboratory is unable to detect calcium and magnesium – how can this be explained?

In the chlor-alkali process, a severe Gore (Grisel) reaction may refer to the situation where the hydrogen chloride gas generated during the electrolysis of sodium chloride contains a large amount of water vapor. This results in an excessive amount of moisture within the hydrogen chloride absorption tower (typically a Gore (Grisel) tower), thereby affecting the purity of the hydrogen gas. If the laboratory is unable to conduct tests for calcium and magnesium, it may be because, under the reaction conditions, the concentration of impurities such as calcium and magnesium is low, making it difficult to detect them accurately with conventional methods, or perhaps the laboratory lacks the appropriate precision instruments and testing techniques. Solving this problem may require improving the chlor-alkali process to reduce water vapor content, or upgrading testing techniques and equipment to accurately measure trace elements such as calcium and magnesium. .

The clouding of saltwater is not necessarily caused by carbonate or magnesium hydroxide precipitates resulting from calcium and magnesium ions. Due to the recent drop in temperatures, it is possible that the decrease in the temperature of the saltwater has led to supersaturation, resulting in a slight amount of salt precipitating out. Carefully check the process conditions and environmental conditions. Please pay attention to whether there are any issues with the insulation or trace heating of pipes and vessels

It’s possible that the filtering hasn’t been done completely; check whether the pressure difference at the site is too high. Usually, a timed backwashing cycle of 1800 seconds is set, rather than backwashing based on pressure difference. Also, has it been too long since the membrane was replaced?