A Process for Producing Olefins Using Aromatic Saturation

A process for producing an olefin stream from a steam-cracked hydrocarbon stream, comprising:

• steam cracking a hydrocarbon stream to form a steam-cracked hydrocarbon stream and a heavy pyrolysis oil stream, wherein the steam-cracked hydrocarbon stream comprises at least one of butadiene, ethylene, propylene, and/or combinations thereof;
• separating the steam-cracked hydrocarbon stream to form a raw pyrolysis gasoline stream and an olefin rich stream;
• hydrotreating the raw pyrolysis gasoline stream to form a second hydrotreated pyrolysis gasoline stream and a light pyrolysis oil stream;
• saturating the light pyrolysis oil stream and at least one additional naphtha/hydrocarbon stream to form a first naphthene stream;
• flowing the first naphthene stream to the steam cracking to form olefins.

A process for producing an olefin stream from a steam-cracked hydrocarbon stream, comprising:

• steam cracking a hydrocarbon stream to form a steam-cracked hydrocarbon stream and a heavy pyrolysis oil stream, wherein the steam-cracked hydrocarbon stream comprises at least one of butadiene, ethylene, propylene, and/or any combination thereof;
• separating the steam-cracked hydrocarbon stream to form an olefin rich stream and a raw pyrolysis gasoline stream;
• hydrotreating the raw pyrolysis gasoline stream to form a second hydrotreated pyrolysis gasoline stream and a light pyrolysis oil stream;
• extracting a first aromatic stream and a raffinate stream from the second hydrotreated pyrolysis gasoline stream;
• flowing the raffinate stream to the steam cracking;
• splitting the first aromatic stream to form a C6 aromatics stream, a C7 aromatics stream and a C8+ aromatics stream;
• saturating a stream comprising:
• a second aromatic stream comprising at least a portion of the C6 aromatics stream, the C7 aromatics stream, the C8+ aromatics stream, or a combination thereof;
• at least a portion of the light pyrolysis oil stream;
• and
• at least a portion of at least one additional naphtha/hydrocarbon stream to form a first naphthene stream;
• flowing the first naphthene stream to the steam cracking to form olefins.

A process for producing an olefin stream from a steam-cracked hydrocarbon stream, comprising:

• steam cracking a hydrocarbon stream to form a steam-cracked hydrocarbon stream and a heavy pyrolysis oil stream, wherein the steam-cracked hydrocarbon stream comprises at least one of butadiene, ethylene, propylene, and/or any combination thereof;
• separating the steam-cracked hydrocarbon stream to form an olefin rich stream and a raw pyrolysis gasoline stream;
• hydrotreating the raw pyrolysis gasoline stream to form a second hydrotreated pyrolysis gasoline stream and a light pyrolysis oil stream;
• extracting a first aromatic stream and a raffinate stream from the second hydrotreated pyrolysis gasoline stream;
• flowing the raffinate stream to the steam cracking;
• splitting the first aromatic stream to form a C6 stream, a C7 stream, a C8 xylene stream, a C8 ethyl benzene rich stream, and a C9+ aromatics stream;
• saturating a stream comprising:
• a second aromatic stream comprising at least a portion of the C6 stream, a portion of the C7 stream, a portion of the C8 xylene stream, a portion of the C8 ethyl benzene rich stream, the C9+ aromatics stream, or a combination thereof;
• at least a portion of at least one additional naphtha/hydrocarbon stream to form a first naphthene stream;
• flowing the first naphthene stream to the steam cracking to form olefins.