Method for treating an alcohol feedstock for the production of olefins

A process for treating an alcoholic feedstock containing at least one monoalcohol, comprising the following stages:

• a) a stage of preheating of said alcoholic feedstock to a temperature of between 70° C. and 200° C., to produce a preheated alcoholic feedstock;
• b) a stage of pretreatment of said preheated alcoholic feedstock on an acidic solid, operating at a temperature of between 70° C. and 200° C., to produce a pretreated alcoholic feedstock;
• c) a stage of partial vaporization of a vaporization feedstock to produce a gaseous stream and a liquid stream, said vaporization feedstock comprising said pretreated alcoholic feedstock obtained at the end of stage b), said partial vaporization stage comprising a partial vaporization section fed with said vaporization feedstock at an inlet pressure of between 0.1 and 1.4 MPa, to produce said gaseous stream and said liquid stream such that the gaseous stream represents at least 70% by weight of the weight of the vaporization feedstock;
• d) a stage of purification of the liquid stream resulting from stage c), to give a stream rich in water, a stream rich in monoalcohol and a stream rich in impurities.