What is the effect of increased or decreased reflux flow on RVP of gasoline in a gasoline stabilization column? what is the effect on RVP in case column is operating on total reflux and what is the effect in case of no reflux flow?
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30/06/2012
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Lionel SHEIKBOUDHOU, Sara, lionel.sheikboudhou@gmail.com
I agree.
Reflux comes from the reboiler, so increase of reflux means increase of condenser duty wich means increase of reboiler duty. As the steam valves opens to increase the reboiler duty, pressure builds up downtream the valve which increases the steam temperature.
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21/05/2010
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keith bowers, B and B Consulting, kebowers47@gmail.com
Mr Ragsdale is correct. To further explain, reflux rate is a good indicator of 'how much work is being done to separate the components.' Less Reflux means less 'work', so the products are less 'pure' and you can expect more of the desired bottoms material to be found in the top product. Top material is kept out of the bottoms product (reducing the RVP) mostly by increasing the bottoms temperature.
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09/04/2010
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Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
The RVP of the bottoms product, naphtha, will be set by the bottoms temperature at a given pressure. The amount of reflux determines the yield of bottoms at a given RVP. The same is true if the overhead is "gassing off", i.e., no liquid product overhead. No reflux drastically reduces the bottoms yield at a given RVP bottoms product.
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