Regarding the selection of temperature for the cooling medium in the reactor?
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The freezing point of the product after the reaction is 50 degrees, and the reaction temperature ranges from 45 to 60 degrees. A stirred tank equipped with a jacket is used for batch reactions, with circulating water flowing through the jacket to provide cooling. Since the reaction is exothermic, it is essential to keep the temperature within this range; therefore, what should be the appropriate temperature for the circulating water? The material has high viscosity, and the specific value is unknown? Temporarily consider heating the hose at 45 or 50 degrees, and use this as a basis to calculate the heat exchange area of the jacket
Based on the description of the problem, the freezing point of the product obtained after the reaction is 50 degrees, and the reaction temperature range is from 45 to 60 degrees. Since it is an exothermic reaction, the jacket must be cooled with circulating water to keep the reaction temperature within the specified range. To determine the appropriate value for the circulating water temperature, the following factors need to be considered: 1. Reaction temperature range: The circulating water temperature should fall within the reaction temperature range, that is, between 45 and 60 degrees. 2. Temperature stability of circulating water: To strictly control the reaction temperature within specified limits, it is also important to ensure the temperature stability of the circulating water, with fluctuations kept as small as possible within the set temperature range. 3. Material viscosity: High material viscosity has a certain impact on the heat exchange efficiency. Relevant empirical values can be referred to or experiments can be conducted to determine the appropriate circulating water temperature. It is reasonable to consider setting the circulating water temperature at 45 or 50 degrees for now, but the final decision will need to be adjusted and optimized based on specific circumstances. Furthermore, based on the set circulating water temperature, the heat exchange area can be calculated to meet the requirements of exothermic reactions. .
The control temperature for the reaction is very close to the freezing point; it is not recommended to use a jacket for heat removal. It is necessary to determine the exact value of the heat generated by the reaction. Since the temperature difference is small, the heat transfer coefficient of the external jacket is not high, so the area of the jacket may be insufficient. It is recommended to use an internal coil for heat exchange; of course, the material selection for the internal coil as well as the welding processes must be properly designed to prevent internal leaks. The viscosity still needs to be measured; otherwise, the heat transfer cannot be calculated accurately.