Medium and temperature of frozen saline
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What solution is generally used for frozen brine in industry? What temperature can be reached? Thank you
A mixture of ethylene glycol and water! Different freezing temperatures, different concentration ratios
An aqueous solution of ethylene glycol: Industrial alcohol can reach lower temperatures than ethylene glycol solutions; manufacturers claim that it can reach -120°C, while I have used it at a minimum of -70°C – going any lower risks solidification
I wonder where the original poster uses it? The calcium chloride solution we use meets the requirements even at -35°C. The aqueous solution of ethylene glycol mentioned above will also work; it can generally reach -68°C
Calcium chloride is generally used; a 30% concentration can be applied； When using ethylene glycol, a 45% concentration can achieve -120°C; I have used it down to at least -70°C℃
Frozen brine mainly uses NaCl; for lower temperatures, CaCl2 and MgCl2 can be used as well. However, chloride ions can corrode pipes, which is why ethylene glycol and similar substances are also often used. Of course, such substances aren’t considered brine anymore
Aqueous solution of ethylene glycol ； A long time ago, aqueous methanol solutions were used. To find out what temperature the chilled water needs to reach, generally -20 degrees is sufficient
Lithium bromide, calcium chloride, ethylene glycol at different concentrations, dichloromethane (with moisture and acidity levels within acceptable limits)
Saline solutions, ethylene glycol, and the like are merely substitutes for cooling fluids; their viscosity increases at low temperatures, which means that the power required for pumps and motors must be taken into account. Moreover, chloride ions are quite reactive, and they can undergo electrochemical reactions with pipeline materials such as carbon steel and stainless steel, potentially leading to pitting and perforations. Once such problems occur, major repairs are necessary. Additionally, in what application is this frozen saline used? It might be worth considering updating the medium used in the process