Feed issues in the distillation process
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I would like to ask, in the production process, such as distillation, how is the feed condition generally taken into consideration? I encountered this problem while performing Aspen simulations; some example problems do not clearly specify the feed conditions, and I think it’s necessary to take into account actual production situations. So please share your experiences. This post was last edited by huanglei on 2009-2-14 15:07.]
Let me share something first. For example, when using Aspen for simulations, a warning message appears if the pressure of the feed is lower than that of the feed plate, which is understandable. But there is no problem if the pressure is higher than that of the feed plate. I have also seen relevant literature stating that the feed pressure should be close to or identical to the pressure of the feed plate. The problem lies here: for a binary system, if the feed pressure is equal to or very close to the pressure at the feed tray, and if the composition of the feed is known, then the feed pressure can generally be determined based on the top pressure of the tower (the top temperature can be determined by considering cooling with cold water, and the required degree of separation at the top allows for an approximate determination of the top pressure), as well as the pressure drop across the trays. Once this is known, the bubble point temperature of the feed can also be determined. Is this really how production works? Is the bubble point feed determined in this way? This post was last edited by huanglei on 2009-2-15 09:16.]
1. The explanation on floor 2 was excellent; the feed pressure should be slightly higher than the pressure at the feed plate, and this is typically controlled using valves. The feed plate features a special design (grooves, holes) to ensure even distribution of the feed. 2. The feed position can be determined through optimized calculations
So how should the feeding condition be considered?
The feed temperature is usually set at the ambient temperature; however, heat recovery is now taken into account, and process waste heat can be used for preheating, thereby saving energy consumption.
May I ask what state the raw material should be in at the final stage before it enters the distillation tower? What are your thoughts on the claims regarding the 1st and 2nd floors? This post was last edited by huanglei on 2009-2-15 10:21]
I recommend an article by Lu Enxi titled \"Optimization of Feed Conditions in the Distillation Process\", published in the 6th issue of 2008
Hmm, nice article. Thanks for recommending it