| http://www.w3.org/ns/prov#value | - Other contaminants or by-products include hydrogen and hydrocarbons such as acetylene, methyl acetylene, propadiene, butadiene and butyne. [0158] Other recovery systems that include purification systems, for example for the purification of olefin (s), are described in Kirk-Othmer Encyclopedia of Chemical Technology, 4th Edition, Volume 9, John Wiley & Sons, 1996, pages 249-271 and 894-899, which i
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