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Abstract

The invention relates to a process for producing olefins from oxygenates with variable production of ethylene and propylene. According to the invention, the process is switched from a state 1 with lower ethylene production to a state 2 with higher ethylene production in that:

the fraction C2re of the ethylene product stream which is recycled to the OTO reactor is lowered from a first value C2re,1 to a second value C2re,2, resulting in a change dC2re=C2re,1−C2re,2,the fraction C4+re of the C4+ product stream containing C4+ olefins which is recycled to the OTO reactor is lowered from a first value C4+re,1 to a second value C4+re,2, resulting in a change dC4+re=C4+re,2−C4+re,1,where the changes dC2re and dC4+re in a mass flow ratio dC4+re/dC2re, where the mass flow ratio is between 70% and 130%.

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First Claim