| 摘要 |
In the process of absorbing isobutylene in strong acids, e.g sulphuric, phosphoric, and toluene sulphonic acids, more molecular proportions of isobutylene are absorbed per molecule of acid than correspond to the basicity of the acid. The acid liquors obtained may be worked up into polymers of isobutylene, mainly di- and tri-isobutylene, by heating, preferably under pressure, with or without previous dilution; or tertiary butyl alcohol may be obtained by distillation. If the distillation is effected in such a manner as to obtain a quick removal of the vapours, e.g. by distillation with steam or under reduced pressure, or both, it is unnecessary first to neutralize the acid liquor, but it is preferred to have during the distillation an acid concentration of less than 40 per cent when sulphuric acid is employed. The best yield of the alcohol from the isobutylene absorbed is obtained with not more than 3 molecules of isobutylene per molecule of sulphuric acid. In examples (1) isobutylene is absorbed in sulphuric acid. (2) Isobutylene is absorbed in isopropyl sulphuric acid, and the mass is then neutralized with ammonia, and steam distilled. The alcohols are salted out and dried. (3) The alcohols are distilled off under reduced pressure. (4) The process is similar to that of Example 2. (5) The acid liquor is diluted slightly and heated in a closed tube to produce di-and tri-isobutylene. (6) The acid liquor is heated without dilution, whereby the proportion of tri-isobutylene is increased slightly.
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