| 摘要 |
An improved cooling system is provided for hot, aqueous caustic solutions, such as received from evaporators employed for the concentration of electrolytically produced dilute caustic solutions. The improved cooling system consists of at least one closed loop circuit in which the hot caustic solution circulates under pressure and in the absence of air. The circuit includes suitable heat exchanger means, for example, a shell and tube device or other known heat transfer apparatus. The novel system not only allows the maintenance of controlled cooling rates, reduces scale formation on heat exchanger surfaces, improves caustic yield and quality due to lessening of carbonate formation but also improves the energy balance of the evaporation process.
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