Reforming benzene extraction
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Why is the benzene product taken out via a side stream in the benzene extraction and evaporation tower for benzene reformation? Since the tower top is designed with full reflux, why isn’t benzene obtained directly from the tower top?
Refer to post 10 of this thread: http://bbs.hcbbs.com/thread-626732-1-1.html
Side-line extraction can help reduce the benzene content. When the non-aromatic content in the benzene feed is high, it can also lead to a reduction in non-aromatics in the overhead benzene stream (although this effect is limited)
It’s a matter of the manufacturing process; we need to figure that out first before we can make a decision
The process is unclear, so it’s impossible to determine.
Due to the extremely high purity requirements for benzene, the components coming out of the top of the tower inevitably contain some non-aromatic compounds; these are removed through full reflux of the benzene extracted from the top, thereby achieving further purification. When the non-aromatic content in the top stream reaches a certain concentration, it can be sent back to the extraction feed tank via the raffinate outlet system. By controlling the temperature and temperature difference in the side line, the purity of benzene can be very high
Top-bled benzene may contain water and non-aromatic compounds; by controlling the temperature difference at the side-stream outlet, benzene with a very high purity of over 99.95% can be obtained