What are the consequences if the temperature of the brine after full halogen-based soda production does not reach the required level?

Does the required temperature of the brine come from two aspects: 1. Accelerating the reaction time of the refining agent； 2. Increasing the viscosity of the saline solution and reducing its density facilitates filtration ； But what are the exact limit temperatures for these two aspects?

It’s definitely not feasible if the temperature of the brine cannot be increased; this leads to a decrease in the adsorption capacity of the secondary brine resin tower. If the temperature entering the electrolyzer is too low, it results in a large temperature difference between the anode and cathode, which directly affects efficiency and the lifespan of the membrane. To solve this, replace the temperature control panel with one that uses steam, and heat it to around 60 degrees, and that will do.

The temperature of the secondary brine can be achieved, as it enters the resin tower after mixing with the primary brine and the concentrated fresh brine, allowing the temperature to reach 60 degrees; it’s just that the primary brine does not meet the temperature requirements.

It’s a matter of optimizing the brine; when the temperature is low, it’s necessary to increase the reaction time between carbonate ions and calcium ions. Otherwise, there won’t be enough time to remove all the calcium ions, which can later affect the resin tower and electrolyzer. Under normal conditions, the reaction time should be at least 40 minutes; this time frame assumes that the temperature of the brine is around 60 degrees. If the temperature drops to 40 degrees, the required time will not be achieved. It is recommended to increase the heating of the brine.

1. According to the information I found today, it states that \"if there is an excess of 0.5 g/l of sodium carbonate and the temperature is above 45°C, then the reaction will be complete within half an hour.\" Does this mean that by controlling the amount of excess sodium carbonate, I only need to maintain a temperature of 45°C? 2. Also, is ceramic membrane filtration sensitive to temperature? ；

1. What’s stated in the materials is correct, but those are just theoretical parameters; there is a difference between them and the parameters used in practice. One cannot apply theories mechanically to solve real-world problems – design always requires some margin for error, and you should be well aware of this. I don’t recommend taking risks; ensuring production stability is of utmost importance. 2. You’ve come to the right person if you have questions about ceramic membranes, haha. The filtration temperature has no impact; however, this is merely a process of physical retention – particles that don’t form cannot be retained. If the reactions before and after filtration are incomplete, the filtering efficiency will be poor. Complete reactions are still crucial. What’s better than membrane types like Kay membranes is that these membranes don’t float on top of the tank, allowing both flocculated magnesium hydroxide and particulate calcium carbonate to be retained simultaneously, resulting in a filtration precision that is much higher than that of organic membranes.

At my previous workplace, the temperature of the brine did not meet the required standards; it could only reach 40°C. The issue had to be addressed by increasing the amount of sodium carbonate and extending the reaction time. After that, the calcium levels in the brine were within acceptable limits. I have personal experience with how temperature affects membrane filtration – when the temperature is low, the efficiency of filtration decreases. For example, after the system was shut down, the temperature of the brine dropped, and after it ran for a while, the pressure in the Jiusi membrane filter increased by 2 meters of water column. Once the temperature of the brine returned to normal, the pressure also returned to its normal level. To ensure optimal performance, the temperature of the brine used in the Jiusi membrane filtration process should be kept between 50–60 degrees Celsius

It seems then that the minimum temperature also needs to be kept at 50 degrees.

In hot weather, temperature has not much impact on performance. But now that it’s winter, there’s a risk that poor control could affect the quality of the brine, which in turn would impact electrolysis efficiency and the lifespan of the ion exchange membrane. If steam is used for heating now, the temperature of the concentrated brine still has to be reduced later, which is not worth it and increases costs I don’t want to use heat, but I’m worried I won’t achieve a delicate result; it’s so confusing!