Changes

<ref>http://www.iup.edu/archives/coal/mining-history/history-of-coke/</ref>

<ref>http://www.iup.edu/archives/coal/mining-history/history-of-coke/</ref>

<ref>http://patheoldminer.rootsweb.ancestry.com/coke2.html</ref>

<ref>http://patheoldminer.rootsweb.ancestry.com/coke2.html</ref>

Modern coking plants recover the gas which, after purification, can be used as a fuel.  

Modern coking plants recover the volatile components which can be separated into ''coal tar'' and ''coal gas''.

==Petroleum coke==

==Petroleum coke==