{HEAD ~ A process} for obtaining {TAIL ~ a tertiary olefin}, e.g. isobutylene in a very pure state by decomposing the corresponding ether, e.g. methyl tert 
for obtaining
{ HEAD ~ A process } for obtaining { TAIL ~ a tertiary olefin } , e.g. isobutylene in a very pure state by decomposing the corresponding ether , e.g. methyl tert
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH