Process for the preparation of lower olefins

Chemistry of hydrocarbon compounds – Plural serial diverse syntheses – To produce unsaturate

Reexamination Certificate

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C585S639000, C585S640000

Reexamination Certificate

active

06852897

ABSTRACT:
A process for the preparation of lower olefins which comprises the step (A) of separating in a high-pressure state a mixed fluid (I) containing dimethyl ether (DME) and methanol at a specified ratio into a gas component (II) and a liquid component (III), separating the gas component (II) into an off-gas and DME, and then making this DME join the liquid component (III) to obtain a liquid component (IV) containing DME and methanol at a specified ratio and the step (B) of subjecting the liquid component (IV) to depressurization and then introducing it into a reactor for the preparation of olefins to form a lower olefin fraction (V). Lower olefins are prepared from a mixed fluid (I) containing DME and methanol at a specified ratio.

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patent: (1998) 10-259148 (1998-09-01), None
patent: WO 9955651 (1999-11-01), None

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