Assertion: butadiene | /r/HasProperty | recycled to the extraction unit
Facets:
Source sentences:
text: The stream of raffinate 3 leaving the recovery section of 1-butene is sent to a dehydrogenation section, producing a stream rich in butadiene, which is recycled to the extraction unit, and a stream of non-reacted butanes and butanes which is recycled to the dehydrogenation reactor, except for a modest purge of C 5+ compounds.