Process for the preparation of lower olefins

Details Process for the preparation of lower olefins Process for the preparation of lower olefins

2005-02-08

2005-02-08

Dang, Thuan Dinh (Department: 1764)

Chemistry of hydrocarbon compounds

Plural serial diverse syntheses

To produce unsaturate

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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