【Daily Question】10.28 True or False: Increasing the reflux ratio can improve the reflux effect (Reply with +2 wealth)
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This post was last edited by Guan Gongyu on 2015-10-29 at 19:01. True or False: Increasing the reflux ratio can improve the reflux effect. So, the larger the reflux ratio, the better? Wrong. +2 wealth for a reply, +5 wealth for a correct answer, +10 wealth for an in-depth discussion. 1. [Petrochemical Section] Show off your “SimSun” activity registration page: http://bbs.hcbbs.com/thread-1469130-1-1.html 2. [Petrochemical Section] Your own random posts: http://bbs.hcbbs.com/thread-1484021-1-1.html 3. [Petrochemical Section] Thread for sharing ideas freely: http://bbs.hcbbs.com/thread-1482814-1-1.html 4. [Petrochemical Section] I’m here among my peers – Survey on the basic information of Petrochemical Section members: http://bbs.hcbbs.com/thread-1485340-1-1.htm
Increasing the reflux ratio can improve the reflux effect. So the larger the reflux ratio, the better... Error
It must be wrong; the reflux ratio is too high, which is not good either. It should be within a certain range
Wrong; although increasing the reflux ratio can yield certain benefits, it’s not the case that a higher value is always better – an excessive reflux ratio increases the load on the tower!
Increasing the reflux ratio can improve the reflux effect. So, the larger the reflux ratio, the better (X)
The answer to this question is incorrect. The ratio of the reflux flow at the top of the tower to the amount of product at the top is called the reflux ratio. Generally, the higher the reflux ratio, the better the distillation efficiency; however, there must be a certain limit to this value. An excessively high reflux ratio will inevitably lead to an overload of the liquid phase at the top of the tower, which can cause foaming at the tower top or leakage from the trays in severe cases. As a result, the yield of the product obtained from the top of the tower decreases, while the side products become lighter in composition.
True or False: Increasing the reflux ratio can improve the reflux effect. So, the higher the reflux ratio, the better (False). Increasing the reflux ratio can improve the reflux effect, but it must be done in moderation; exceeding the heating steam or tower top cooling capacity will affect operations. Additionally, the energy costs increase, so it’s not true that a higher ratio is always better.
The mistake is that during the production process, the number of trays or the theoretical number of trays in the distillation column remains constant. Increasing the reflux ratio raises the concentration of the light components at the top of the column, improving their quality; however, it also increases the evaporation rate in the reboiler at the bottom of the column as well as the workload of the coolers at the top (air coolers, condensers), thereby increasing energy consumption； Increasing the load on the column raises the content of light components in the heavy fractions at the bottom of the column. Therefore, the reflux ratio is not the higher the better; it needs to be adjusted reasonably based on actual conditions.
True or False: Increasing the reflux ratio can improve the reflux effect. Therefore, the larger the reflux ratio, the better (×). Generally, a higher reflux ratio leads to better distillation results, but there must be a certain limit; an excessively high reflux ratio will inevitably cause an overload of the liquid phase at the top of the tower. In severe cases, this can result in foam entrainment at the tower top or leakage from the trays, leading to a decrease in the yield of the product obtained at the top of the tower. The side products become lighter in composition, and the energy consumption per unit of product also increases.
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No. A larger reflux ratio is not desirable, as it can carry away too much heat from the tower, disrupting the heat balance within it. An excessive amount of reflux can also increase the load on the heating furnace. Effects that are not favorable for separation.