Process for converting one or more methyl halides to acyclic C3-C6 olefins

Process for converting one or more methyl halides to acyclic C3-C6 olefins said process comprising the following steps:

• a) providing a feedstream comprising one or more methyl halides;
• b) providing a catalyst composition;
• and
• c) contacting said feedstream with the said catalyst composition under reaction conditions;
• the process is characterized in that said reaction conditions include a reaction temperature below 400° C., and in that said catalyst composition comprises one or more molecular sieves with a Si/Al atomic ratio ranging from 2 to 18 and wherein said one or more molecular sieves comprise a plurality of pores, wherein said pores have a shape of an 8-membered ring or less, wherein the selectivity to C3-C6 olefins is of at least 50%, wherein one or more molecular sieves have an average pore size diameter of at most 4.2 Å, as determined by BET experiments, and wherein the molecular sieve is doped with one or more phosphorus-containing materials and one or more alkaline earth metal-containing materials.