46
the recycle drum is then pumped, cooled split into two streams, the recycle C
4
cut and the
stage 2 feed, that goes to the second reactor.
The stage 2 feed is mixed with a second hydrogen make-up and enters the second reactor
bottom and flows upwards through the catalytic bed. The remaining butadiene is
hydrogenates selectively and the effluent is sent to the C
4
stabilizer.
Stabilization section
The stage 2 effluent is preheated in a heat exchanger with the stabilizer bottom and feed the
stabilizer. In the stabilizer, light compounds of the products due to the H
2
make-up quality are
removed. The column overhead is partially condensed and collected in the reflux drum where
vapor is purged and water drained. The liquid returns back to the column as reflux.
The column bottom stream constitutes the final product. This stream is cooled down and
routed to product storage.
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