PURPOSE: To obtain high-purity isobutylene, by bringing an isobutylene feed containing butene-1 into contact with a group VIII metallic catalyst, such as Pd, in the liquid phase in the presence of a small quantity of hydrogen under specific temperature condition, isomerizing the butene-1 to butene-2 and removing the butene-2 by distillation.
CONSTITUTION: An isobutylene feed containing 0.2W2.0wt.% butene-1 is brought into contact with a group VIII metal-containing catalyst in the liquid phase in the presence of hydrogen in a quantity of 0.002W0.008mol. (preferably 0.003W0.007mol.) based on 1mol. feed at 10W100°C (preferably 30W70°C) to isomerize the butene-1 to butene-2, which is then removed by distillation to afford the aimed high-purity isobutylene with hardly any content of the butene-1 for producing butyl rubber. Pd is preferred as the group VIII metal and 0.01W1.0wt.% Pd is supported on a carrier (preferably alumina). Loss of the isobutylene by conversion thereof into isobutane can be suppressed within 0.3% by the above-mentioned method.
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HARA KOJI
TOCHIUCHI CHIAKI
| JPS595129A | 1984-01-12 | |||
| JPS48602A | ||||
| JP44026086A |