Methods for forming light olefins by cracking
AssigneeDow Global Technologies LLC
InventorsMatthew T. Pretz, Yu Liu
Life of this patent
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Abstract
According to one or more embodiments presently disclosed, light olefins may be formed by a method that may comprise introducing a feed stream into a reactor, reacting the feed stream with a cracking catalyst in the reactor to form a product stream, and processing the cracking catalyst. The reactor may comprise an upstream reactor section and a downstream reactor section. The upstream reactor section may be positioned below the downstream reactor section. The upstream reactor section may have an average cross-sectional area that is at least 150% of the average cross-sectional area of the downstream reactor section.
Claims16
A method for forming light olefins, the method comprising:
- introducing a feed stream into a reactor, the reactor comprising an upstream reactor section and a downstream reactor section, the upstream reactor section positioned below the downstream reactor section, and the upstream reactor section having an average cross-sectional area that is at least 150% of the average cross-sectional area of the downstream reactor section, wherein the upstream reactor section operates as a fast fluidized, turbulent, or bubbling bed upflow reactor;
- reacting the feed stream with a cracking catalyst in the reactor to from a product stream, wherein the feed stream comprises one or more of naphtha or butane, and the product stream comprises one or more of ethylene, propylene, or butene;
- and
- processing the cracking catalyst, the processing of the cracking catalyst comprising:
- passing the catalyst from the reactor to a combustor;
- burning a supplemental fuel source in the combustor to heat the catalyst;
- and
- passing the heated catalyst from the combustor to the reactor.
A method for forming light olefins, the method comprising:
- introducing a feed stream into a reactor, the reactor comprising an upstream reactor section and a downstream reactor section, the upstream reactor section positioned below the downstream reactor section, and the upstream reactor section having an average cross-sectional area that is at least 150% of the average cross-sectional area of the downstream reactor section, wherein the upstream reactor section operates as a fast fluidized, turbulent, or bubbling bed upflow reactor and the downstream reactor section operates as a dilute phase riser reactor;
- reacting the feed stream with a cracking catalyst in the reactor to from a product stream wherein the feed stream comprises one or more of naphtha or butane, and the product stream comprises one or more of ethylene, propylene, or butene;
- and
- processing the cracking catalyst, the processing of the cracking catalyst comprising:
- passing the catalyst from the reactor to a combustor;
- burning a supplemental fuel source in the combustor to heat the catalyst;
- and
- passing the heated catalyst from the combustor to the reactor.
A method for forming light olefins, the method comprising:
- introducing a feed stream into a reactor, the reactor comprising an upstream reactor section and a downstream reactor section, the upstream reactor section positioned below the downstream reactor section, and the upstream reactor section having an average cross-sectional area that is at least 150% of the average cross-sectional area of the downstream reactor section, wherein the upstream reactor section operates as a fast fluidized, turbulent, or bubbling bed upflow reactor, and wherein the feed stream comprises one or more of naphtha or butane;
- reacting the feed stream with a cracking catalyst in the reactor to form a product stream, wherein the product stream comprises one or more of ethylene, propylene, or butene;
- and
- processing the cracking catalyst, the processing of the cracking catalyst comprising:
- passing the catalyst from the reactor to a combustor;
- burning a supplemental fuel source in the combustor to heat the catalyst;
- and
- passing the heated catalyst from the combustor to the reactor.
Dependencies are inferred from the claim text.