METHOD FOR DEHYDRATING A MIXTURE CONTAINING ETHANOL AND ISOPROPANOL

摘要

The present invention relates to a process for the preparation of a mixture of ethylene and propylene from a mixture containing ethanol and isopropanol and having a water content of 30 to 75% by weight relative to the total weight of the mixture, comprising the following steps: a) mixing the mixture in a dehydrating device, -Alumina (A) with a BET specific surface area of 200 to 280 m 2 /g, an average mesopore diameter of 5 to 15 nm, a sodium content of less than 50 ppm by weight and a sulfur content of less than 40 ppm by weight, measured according to standard ASTM D 3663-03; And -BET specific surface area of 130 to 180 m 2 /g, average mesopore diameter of 14 to 20 nm, sodium content of 300 to 600 ppm by weight and sulfur content of 800 to 1300 ppm by weight, alumina (B ) Contacting with a dehydration catalyst selected from, Wherein the contacting is carried out at a temperature of 350 to 500° C., at a total pressure of 0.2 to 2 MPa, and at a weight time space velocity (whsv) 1 to 10 h ^{-1 defined as the ratio of the mass flow rates of ethanol and isopropanol to the mass of the catalyst.} The step of becoming; b) discharging the effluent containing ethylene and propylene from the dewatering device.