Process for dehydration of mono-alcohol(s) using a modified crystalline aluminosilicate

A process for dehydration of a mono-alcohol, or of a mixture of at least two mono-alcohols, having at least 2 carbon atoms and at most 7 carbon atoms into olefins having the same number of carbons, the process comprising the following steps:

• i.) providing a catalyst composition;
• ii.) providing a feed (A) comprising said mono-alcohol, or said mixture of at least two mono-alcohols, optionally water, and optionally an inert component;
• iii.) contacting said feed (A) with said catalyst at conditions effective to dehydrate at least a portion of said mono-alcohol and;
• iv.) recovering an effluent (B) and removing water, the inert component if any and unconverted alcohols if any from said effluent (B) to recover said olefins having the same number of carbons as said mono-alcohol;
• characterized in that said catalyst composition comprises a modified crystalline aluminosilicate having an acidity between 350 and 500 μmol/g measured by temperature programmed desorption of ammonia, wherein said process further comprises a process for preparing said catalyst composition comprising the following steps:
• a) providing a crystalline aluminosilicate having a Si/Al framework molar ratio greater than 10;
• b) optionally shaping and/or calcining said crystalline aluminosilicate;
• c) steaming said crystalline aluminosilicate, or said shaped and/or calcined crystalline aluminosilicate:
• at a temperature ranging from 100° C. to 380° C.;
• under a gas phase atmosphere, without liquid, containing from 5 wt % to 100 wt % of steam and the rest being one or more gases selected from N2, CO2, Ar, He, CH4, air, depleted air containing below 10 wt % of oxygen as based on the total weight of the depleted air, or any mixture thereof;
• at a pressure ranging from 2 to 200 bars;
• at a partial pressure of H2O from 2 bars to 200 bars;
• and
• said steaming being performed for a period at least 30 min and up to 144 h.