Isobutylene → 2,4,4-Trimethyl-1-pentene

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The apparatus as shown in FIG. 2 was employed in this Example. Reactor I employed had a 120 ml reaction zone and two separation zones, one at the upper portion of the reaction zone and the other at the lower portion of the reaction zone and the reaction zone was divided into 7 compartments and each compartment was stirred with a flat stirring paddle. The same so-called spent B-B fraction as in Example 3 was fed at a rate of 50 ml per hour to the lowest compartment of reactor I through line 1 and at the same time a recycling liquid containing water and 12-tungstophosphoric acid having an atomic ratio of P to W of 1 to 12 in a weight ratio of 1 to 2 coming from distillation column II through line 2 was fed at a rate of 442 g per hour to the highest compartment of reactor I. In reactor I the so-called spent B-B fraction and the mixture of the recycling liquid and the additional water was countercurrently contacted with each other at 70° C. and 10 atms. The remaining hydrocarbon mixture was collected from the upper separation zone of reactor I through line 5 while an aqueous solution containing tert-butanol formed and the 12-tungstophosphoric acid was transferred from the lower separation zone of reactor I through line 4 to distillation column II. Then, the tert-butanol formed was collected by distillation from the top of distillation column II through line 6 and an aqueous solution containing the 12 -tungstophosphoric acid was recycled from the bottom of distillation column II through line 2 to the highest compartment of reactor I together with additional water through line 3 in an amount corresponding to the amount reduced in the reaction and escaped from the reaction system. The conversion of isobutylene was 95.4% and the amount of isobutylene polymers such as diisobutylene formed was at most 1,000 ppm based on the weight of tert-butanol produced and the selectivity of isobutylene to tert-butanol was quantitative.

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