★Specialized Examination for Chemical Engineering ★ — One question per day (2015-12-16) — Points are awarded for participation
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Points system for the daily question: Participation – 1~3 points; Correct answer – 5 points; In-depth analysis – 5~10 points. The answer is provided the next day. Due to limited capabilities, I am unable to provide more in-depth explanations for each question; therefore, on the second day, in addition to offering reference options, I will also remove the restriction on reading replies. I hope that all candidates can learn from one another and improve together! Daily Question (2015-12-16): 1. Forced external circulation crystallizers are usually not used for ( ). A. Indirect cooling crystallization B. Evaporation crystallization C. Vacuum cooling crystallization D. Direct contact cooling crystallization 2. At normal pressure, the dew point of moist air is 21°C. To reduce the humidity H of air at 50°C, what should be the temperature of the water used as a cooling medium in the gas cooling tower? A. Above 21°C B. Equal to 21°C C. Below 21°C D. 50°C Answer: Question 1: D, Question 2: C
1. D ABC is a batch crystallizer with interwall heat exchange; D relies on the direct mixing of the cooling medium with the crystallization mother liquor to achieve cooling. 2. C
D. Direct contact cooling crystallization C. Below 21℃
1. Forced external circulation crystallizers are usually not used for (D). A. Indirect cooling crystallization B. Evaporation crystallization C. Vacuum cooling crystallization D. Direct contact cooling crystallization 2. At normal pressure, the dew point of wet air is 21°C; in order to reduce the humidity of air at 50°C, the temperature of the water used as a cooling medium in the gas cooling tower should be (C). A. Above 21°C B. Equal to 21°C C. Below 21°C D. 50℃
1, D——–——–——––––––– 2, C.
1. D can use a direct-contact cooling crystallizer. 2. B
1. Forced external circulation crystallizers are usually not used for (C. vacuum cooling crystallization). 2. At atmospheric pressure, the dew point of moist air is 21°C. In order to reduce the humidity H of air at 50°C, the temperature of the water used as a cooling medium in the gas cooling tower should be (C. below 21°C).