It is {HEAD ~ an object} of the present invention to provide a high conversion of {TAIL ~ isobutylene} contained in a mixture of isomeric butenes simultaneously with a reduced yield of by products sec.butylphenols 
It is { HEAD ~ an object } of the present invention to provide a high conversion of { TAIL ~ isobutylene } contained in a mixture of isomeric butenes simultaneously with a reduced yield of by products sec.butylphenols
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