Evaporation of lithium bromide aqueous solution
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The workshop is equipped with lithium bromide absorption chillers; can hot water at 80 degrees be used to evaporate the water in the lithium bromide solution? The boiling point of lithium bromide is above 1000 degrees, while the boiling point of water is 100 degrees. When an aqueous solution of lithium bromide is heated with hot water at 80 degrees, water evaporates from this solution. I’m not quite sure how this works; those who know could please explain it. Thank you
Sure. 80-degree hot medium water is sufficient to evaporate water, as the boiling point of water decreases in lithium bromide aqueous solutions, so 100 degrees is not necessary. Lithium bromide itself does not evaporate at this temperature, as its boiling point is much higher than that of water. .
The operation of lithium bromide units relies on a certain level of vacuum. At 1 atmosphere of pressure, the boiling point of water is 100 degrees, but at an absolute pressure of 3 kPa, the boiling point drops to 25 degrees. Therefore, at 80 degrees, with the appropriate level of vacuum, water can exist in a gaseous state