US 2007/0185359 A1 · Gasoline production by olefin polymerization

Abstract

A process unit for the zeolite-catalyzed conversion of light refinery olefins from an FCC unit such as ethylene, propylene, and butylene to gasoline boiling range motor fuels comprises at least two sequential, serially connected reactors connected in parallel to a fractionation section with at one or two fractionators for separating the reactor effluents into product fraction with an optional recycle stream or streams. The configurations according to this scheme allow the adjustment of reactor temperature and/or pressure and/or space velocity to be based on the reactivities of the olefin compounds present in the LPG streams so that the gasoline produced in each reactor will be separated immediately, to reduce over-polymerization of the gasoline in the low severity reactor and to ensure that gasoline formed in the low severity reactor will not be sent to the higher severity reactor e.g. with a higher reactor temperature, where excessive polymerization to undesirable higher molecular with products may take place.

Claims20

Dependent claims

A process unit for the conversion of FCC refinery gas feed stream containing light C3-C4 olefins into a gasoline boiling range product which comprises:

at least two reactors each containing a fixed bed of a solid, porous, molecular sieve olefin polymerization catalyst, each reactor having a feed inlet and an effluent outlet, the reactors being serially connected for sequential flow of the olefin feed from one reactor to the next,
a fractionation section connected to the effluent outlets of each reactor to receive the effluent from each reactor.

A process for the conversion of an FCC light gas stream containing light C3-C4 olefins into a gasoline boiling range product which comprises:

feeding the light gas stream containing the light olefins into the feed inlet of a first reactor containing a fixed bed of a solid, porous molecular sieve olefin polymerization catalyst to polymerize the olefins in the feed under a first set of reaction conditions to form an effluent comprising polymerized product in the gasoline boiling range formed from the light olefins,
passing the first stage reactor effluent to a feed inlet of a fractionation section and fractionating the first stage effluent stream to form a heavy fraction comprising gasoline boiling range product and a light fraction comprising unreacted olefins, passing light fraction from the fractionation section to the feed inlet of a second stage reactor containing a fixed bed of a solid, porous molecular sieve olefin polymerization catalyst to polymerize the olefins in the feed under a second set of reaction conditions which are more severe than those of the first set to form a second stage reactor effluent comprising polymerized product in the gasoline boiling range formed from the unreacted light olefins, passing the second stage reactor effluent to a feed inlet of the fractionation section;
fractionating the second stage reactor effluent in the fractionation section to form a heavy fraction comprising gasoline boiling range product and a light fraction comprising unreacted olefins.

Dependencies are inferred from the claim text.

Gasoline production by olefin polymerization

Life of this patent

Gasoline production by olefin polymerization

Life of this patent

Abstract

Claims20