How to prevent freezing of ion exchange columns used in cold regions
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The average winter temperature here is minus 20 degrees. Our approach is to ensure insulation and proper drainage. When the ion exchange column is shut down for a short period, a small flow of water is allowed to pass through it; whereas when it is shut down for an extended period, the water is drained first, and then air is used to blow dry the resin inside the column (without removing the resin). However, many resin particles get damaged when the column is used again. Please discuss any better methods to prevent freezing
An effective method is to use saltwater for preservation against freezing; for example, 15% saltwater (sodium chloride) has a freezing point of around -20 degrees. Accurate concentration and freezing point data can be found on Baidu or in other sources.