Air Separation Technology Section [Daily Question] 1/17/2012 (Tuesday)
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This post was last edited by hxm2087 on 2012-1-16 at 20:45. Today’s 【Daily Question】 regarding the air separation oxygen production process: 1. What is the temperature trend from the bottom to the top of the lower column in an air separation distillation tower? A. Gradually increasing B. Gradually decreasing C. Increasing first, then decreasing D. Decreasing first, then increasing 2. In the distillation section of an air separation tower, what is the relationship between the argon concentration in the argon-enriched zone and that in the stripping zone? A. Higher B. Lower C. Equal D. Not necessarily 3. When it is necessary to activate the molecular sieve, the flow rate of air to be processed should be reduced to ( ) of the normal level. A. 70~80% B. 80~90% C. 85~90% D. 90~95% Notes: 1. The purpose of this activity is to review the knowledge we have already learned, thereby improving and strengthening everyone’s fundamental theoretical knowledge. It helps to reinforce what one already knows and restore memory for what has been forgotten； 2. Please be sure to hide your replies! Hide method address. A reply that is not hidden is considered an invalid reply ； 3. Effective participation earns 2 wealth points; getting two answers correct grants 4 wealth points, while correct answers yield 6 wealth points. Those who provide a brief analysis may receive an additional 1–5 wealth points at the moderator’s discretion. Points will be deducted for irrelevant comments, and each reply can only be rated once. Any invalid ratings should be revoked by the respective moderators ； 4. Do not edit after replying; editing after replying will only earn you 2 wealth points as a reward ； 5. Be sure to set the reply to be visible when responding; otherwise it will be deleted ； 6. Members who have any objections to the questions can contact me via private message to discuss them ； 7. The answer will be announced in the next issue ； 8. Answers to the previous issue: 1. After liquid appears in the main cooler; 2. Transition point; 3. Internal energy and temperature. 9. Link to the previous issue. 10. Some explanations and suggestions regarding scoring
Reply 1# hxm2087 C D C
1.a 2.a 3.a Reply 1# hxm2087
1. The temperature variation pattern from the bottom to the top of the lower column of an air separation distillation tower is (B: gradually decreasing). A. Gradually increasing B. Gradually decreasing C. First increasing then decreasing D. First decreasing then increasing. 2. In the distillation section of an air separation tower, the argon concentration in the argon-enriched zone is (D: not necessarily) higher than that in the argon-enriched zone of the stripping section; this might be a trap for those who are not careful. A. Higher B. Lower C. Equal D. Not necessarily. 3. When it is necessary to activate the molecular sieve, the flow rate of air to be processed is reduced to (A: 70~80%) of the normal level. There have been cases where the air separation process was not carried out within these ranges. A. 70~80% B. 80~90% C. 85~90% D. 90~95%
aaa reply 1# hxm2087
Reply 1# hxm2087 b b a
1. The temperature variation pattern from the bottom to the top of the lower column of an air separation distillation tower is (B): A. Gradually increasing; B. Gradually decreasing; C. Increasing first and then decreasing; D. Decreasing first and then increasing. 2. In the distillation section of an air separation tower, the argon concentration in the argon-enriched zone is (B) compared to that in the argon-enriched zone of the stripping section: A. Higher; B. Lower; C. Equal; D. Not necessarily. 3. When it is necessary to activate the molecular sieve, the flow rate of air to be processed is reduced to (B) of the normal level: A. 70~80%; B. 80~90%; C. 85~90%; D. 90~95%
Reply 1# hxm2087 C A D
Personal understanding: 1) In Tower B, the temperature definitely increases as one goes lower, and the components become heavier; otherwise, counter-current flow cannot be achieved. 2) Compared to nitrogen, argon is more similar to oxygen; therefore, argon tends to accumulate more in the retention section. 3) I don’t know