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Abstract

A continuous process for preparing an isoolefin having 4 to 6 carbon atoms is performed by cleaving a compound of the formula I R.sub.1--O--R.sub.2 (I) wherein R.sub.1=a tertiary alkyl radical having 4 to 6 carbon atoms, and R.sub.2=H or an alkyl radical, in a gas phase over a solid catalyst, in the temperature range of 200 to 400.degree. C., at a pressure of 0.1 to 1.2 MPa, in a reactor which is equipped with a heating jacket and is heated with a liquid heat carrier, wherein the cleavage is carried out in such a way that a temperature drop in the catalyst zone at any point in relation to the entrance temperature is less than 50.degree. C., wherein (i) a reaction mixture in the reactor and (ii) the heat carrier in the jacket flow through the reactor in cocurrent, and wherein a temperature difference of the heat carrier between a feed point to the reactor and an outlet from the reactor is adjusted to less than 40.degree. C.

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