【Q&A Question 190】2017.07.09
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This post was last edited by liuquan1100 on 2017-8-7 21:41. [Q&A Question 190] 2017.07.09: Explain what full reflux is The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Note: For questions of the type \"one question per day,\" if a person replies continuously for a month, that is, posts more than 30 times, their score will be assigned as 2 points, which is the lowest possible score. Click once to reply; if multiple replies are made, points will be awarded as appropriate, as deleting posts is also a waste of time. The practice of using all the overhead condensate as reflux is known as full reflux. Scoring criteria: 2 Wealth points for incorrect responses; *incomplete* answers earn 3–8 points. 10 Wealth points are given for correct answers accompanied by detailed explanations; responses that are correct but lack sufficient details earn 15–20 Wealth points. Please score according to these criteria. Note: If there are editing records after answering, only points will be awarded to those who participated. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Petrochemical Sector – “Creative Ideas for Energy Saving” Campaign (Second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html 2017 Coal Chemicals – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html
The reflux ratio is infinite; the top product, feed, and bottom product are zero
All the liquid that condenses at the top of the tower is returned back into the tower, which is known as full reflux
Total reflux generally refers to a specific operating condition in the distillation process. In the operation of a distillation tower, steam moves upward while the liquid flows downward; the two phases come into contact at the various trays or packing in the middle section of the tower, where mass and heat transfer occur. For continuous operation, the bottom of the tower needs to heat the liquid to turn it into steam, while the top of the tower must condense the steam back into a liquid. Under normal operating conditions, a portion of the condensate at the top of the tower is taken as distillate, while another portion is recycled back down from the top of the tower; the ratio between this recycled portion and the portion taken as distillate is known as the reflux ratio (R). [
If the steam that rises to the top of the tower is condensed in a total condenser and all of the condensate returns back into the tower, this mode of reflux is called total reflux
If the steam that rises to the top of the tower is condensed in a total condenser and all of the condensate is returned back into the tower, this type of reflux is known as total reflux
Explain what full reflux is The practice of using all the overhead condensate as reflux is known as full reflux.
In the operation of a distillation tower, steam moves upward while the liquid flows downward; the two phases come into contact at the various trays or packing in the middle section of the tower, where mass and heat transfer occur. For continuous operation, the bottom of the tower needs to heat the liquid to turn it into steam, while the top of the tower must condense the steam back into a liquid. Under normal operating conditions, a portion of the condensate at the top of the tower is taken as distillate, while another portion is recycled back down from the top of the tower; the ratio between this recycled portion and the portion taken as distillate is known as the reflux ratio (R). Under special circumstances, all the condensate at the top of the tower can be refluxed back into the tower, that is, the reflux ratio R is equal to infinity. Then this operating state is called full reflux.
In the operation of a distillation tower, steam moves upward while the liquid flows downward; the two phases come into contact at the various trays or packing in the middle section of the tower, where mass and heat transfer occur. For continuous operation, the bottom of the tower needs to heat the liquid to turn it into steam, while the top of the tower must condense the steam back into a liquid. Under normal operating conditions, a portion of the condensate at the top of the tower is taken as distillate, while another portion is recycled back down from the top of the tower; the ratio between this recycled portion and the portion taken as distillate is known as the reflux ratio (R). Under special circumstances, all the condensate at the top of the tower can be refluxed back into the tower, that is, the reflux ratio R is equal to infinity. Then this operating state is called full reflux.