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US 12,606,504 B2Granted
Methods for making ethylene and methods for making propylene
AssigneeSaudi Arabian Oil Company
InventorsHaitao Huang, Mohammad A. Alabdullah, Mosab T. Kheyami, Yufeng He
Life of this patent
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Abstract
Described herein are methods for converting butene. In some embodiments, butene is converted to an ethylene-containing products. In additional embodiments, butene is converted to an propylene-containing products. In additional embodiments, butene is selectively converted to an ethylene-containing product and a propylene-containing product. These methods generally include metathesis and cracking reactions, as described.
Claims20
A method for converting butene to an ethylene-containing product, the method comprising:
- passing a butene-containing feed stream to a metathesis reactor, wherein at least a portion of the butene-containing feed stream is metathesized in the metathesis reactor to form a metathesis effluent stream;
- passing the metathesis effluent stream and a cracked effluent stream to a separation unit and forming a separated ethylene-containing stream, a separated propylene-containing stream, a separated butene-containing stream, and a separated C5+ olefin-containing stream, wherein the separated ethylene-containing stream exits the separation unit as the ethylene-containing product;
- passing the separated C5+ olefin-containing stream to a cracking reactor, wherein at least a portion of the separated C5+ olefin-containing stream is cracked in the cracking reactor to form the cracked effluent stream, wherein the C5+ olefin-containing stream consists of C5+ hydrocarbons, and the C5+ olefin-containing stream is the only stream passed to the cracking reactor;
- and
- recycling at least a portion of the separated propylene-containing stream and at least a portion of the separated butene-containing stream to the metathesis reactor.
2 more elements
A method for converting butene to a propylene-containing product, the method comprising:
- passing a butene-containing feed stream to a metathesis reactor, wherein at least a portion of the butene-containing feed stream is metathesized in the metathesis reactor to form a metathesis effluent stream;
- passing the metathesis effluent stream and a cracked effluent stream to a separation unit and forming a separated ethylene-containing stream, a separated propylene-containing stream, a separated butene-containing stream, and a separated C5+ olefin-containing stream, wherein the separated propylene-containing stream exits the separation unit as the propylene product;
- passing the separated C5+ olefin-containing stream to a cracking reactor, wherein at least a portion of the separated C5+ olefin-containing stream is cracked in the cracking reactor to form the cracked effluent stream, wherein the C5+ olefin-containing stream consists of C5+ hydrocarbons, and the C5+ olefin-containing stream is the only stream passed to the cracking reactor;
- and
- recycling at least a portion of the separated ethylene-containing stream and at least a portion of the separated butene-containing stream to the metathesis reactor.
2 more elements
A method for selectively converting butene to an ethylene-containing product and a propylene-containing product, the method comprising:
- operating a chemical conversion system to form the ethylene-containing product by a method comprising:
- isomerizing the butene-containing feed stream to change the ratio of 1-butene to 2-butene in the butene-containing feed stream;
- passing a butene-containing feed stream to a metathesis reactor, wherein at least a portion of the butene-containing feed stream is metathesized in the metathesis reactor to form a metathesis effluent stream;
- passing the metathesis effluent stream and a cracked effluent stream to a separation unit and forming a separated ethylene-containing stream, a separated propylene-containing stream, a separated butene-containing stream, and a separated C5+ olefin-containing stream, wherein the separated ethylene-containing stream exits the separation unit as the ethylene-containing product;
- passing the separated C5+ olefin-containing stream to a cracking reactor, wherein at least a portion of the separated C5+ olefin-containing stream is cracked in the cracking reactor to form the cracked effluent stream;
- and
- recycling at least a portion of the separated propylene-containing stream and at least a portion of the separated butene-containing stream to the metathesis reactor;
- stopping the operation of the chemical conversion system to form the ethylene-containing product;
- operating the chemical conversion system to form the propylene-containing product by a method comprising:
- isomerizing the butene-containing feed stream to change the ratio of 1-butene to 2-butene in the butene-containing feed stream;
- passing a butene-containing feed stream to a metathesis reactor, wherein at least a portion of the butene-containing feed stream is metathesized in the metathesis reactor to form a metathesis effluent stream;
- passing the metathesis effluent stream and a cracked effluent stream to a separation unit and forming a separated ethylene-containing stream, a separated propylene-containing stream, a separated butene-containing stream, and a separated C5+ olefin-containing stream, wherein the separated propylene-containing stream exits the separation unit as the propylene product;
- passing the separated C5+ olefin-containing stream to a cracking reactor, wherein at least a portion of the separated C5+ olefin-containing stream is cracked in the cracking reactor to form the cracked effluent stream, wherein the C5+ olefin-containing stream consists of C5+ hydrocarbons, and the C5+ olefin-containing stream is the only stream passed to the cracking reactor;
- and
- recycling at least a portion of the separated ethylene-containing stream and at least a portion of the separated butene-containing stream to the metathesis reactor.
12 more elements
Dependencies are inferred from the claim text.