We have an overflow tank here, and the liquid level is always low
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The aqueous phase is sodium hydroxide, and the organic phase is isopropylbenzene; in an overflow tank, as soon as the sun comes up each day, the level of the aqueous phase drops by noon, and it rises again at 6 p.m. Having considered the issue of solubility, it seems unlikely; the sun is strong at noon, the density of the alkaline solution decreases, and its volume should increase. Rather than decreasing, you know. .
At noon, the sun is strong and the temperature is high, which increases solubility and reduces volume. After 6 p.m., the temperature drops, solubility decreases, volume increases, and the liquid level rises.
It may be related to changes in process conditions caused by the rise in the temperature of the circulating water during the day
It might be a problem with the level gauge’s measurement