Process for producing lower olefins under negative pressure

Details Process for producing lower olefins under negative pressure Process for producing lower olefins under negative pressure

2011-01-25

2011-01-25

Nguyen, Tam M (Department: 1797)

Chemistry of hydrocarbon compounds

Unsaturated compound synthesis

By c content reduction, e.g., cracking, etc.

C585S653000, C208S113000, C208S120010

Reexamination Certificate

active

07875756

ABSTRACT:
A process for producing lower olefins is disclosed. The technical problem is to overcome the defects presented in the prior art including high reaction pressure, high reaction temperature, low yield and selectivity of lower olefins as the target products, poor stability and short life of catalyst, and limited suitable feedstocks. The disclosed process, which is carried out under the conditions of catalytic cracking olefins and adopts as a feedstock an olefins-enriched mixture containing one or more C4 or higher olefins and optionally an organic oxygenate compound, comprises the steps of: a) letting the feedstock contact with a crystalline aluminosilicate catalyst having a SiO2/Al2O3molar ratio of at least 10, to thereby produce a reaction effluent containing lower olefins; and b) separating lower olefins from the reaction effluent; wherein, the reaction pressure is from −0.1 MPa to <0 MPa.

REFERENCES:
patent: 5981819 (1999-11-01), Moeller et al.
patent: 6222087 (2001-04-01), Johnson et al.
patent: 7692057 (2010-04-01), Xie et al.
patent: 2003/0181777 (2003-09-01), Powers et al.
patent: 102 33 069 (2003-09-01), None
patent: 61-289049 (1986-12-01), None
patent: WO-2004/072002 (2004-08-01), None

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