Olefin double bond isomerization
AssigneePhillips Petroleum Company
InventorsJohn W. Myers, Dean P. Montgomery
Life of this patent
Estimating the term…
Abstract
Aliphatic monoolefins which can be normal or branched are isomerized at temperatures in the approximate range 500.degree.-1200.degree. F. in presence of a high surface area activated alumina containing a relatively low amount of sodium oxide (Na.sub.2 O) to form 1-olefin. Generally, from about 0.13 to about 0.39 milliequivalents of Na.sub.2 O per gram of the activated alumina containing the Na.sub.2 O, supplied by such sodium compounds as are disclosed, the activated alumina having a large surface area, i.e., about 300-400 m.sup.2 per gram, is used as a catalyst for the isomerization of, say, isomeric n-butenes. Generally, the olefin treated will have from 4 to about 20 carbon atoms per molecule.
Claims5
A process for shifting an internal double bond of a monoolefin having 4-20 carbon atoms to yield terminal olefin which comprises heating said monoolefin under isomerization conditions at an isomerization temperature in the approximate range 260.degree.-650.degree. C. (500.degree.-1200.degree. F.) sufficient to cause shifting of the double bond while avoiding substantial cracking or skeletal isomerization in presence of a catalyst or contact mass essentially comprising an activated alumina having a surface area in the approximate range of from about 300 to about 400 square meters per gram and containing sodium oxide in the approximate range 0.13-0.39 milliequivalents of Na.sub.2 O per gram of catalyst, and silica in the approximate range 0.5-6.3 weight percent of the catalyst, the sodium oxide having been supplied in the catalyst composition using a compound of sodium which on calcination yields the oxide.
Dependencies are inferred from the claim text.