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US 12,522,769 B2Granted
Process to prepare feed by using dividing wall column and/or conventional column for catalytic cracking unit targeting olefin production
AssigneeKellogg Brown & Root LLC
InventorsBhari Bhujan Singh, Ian Charles Elgey
Life of this patent
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Abstract
A dividing wall column or a pair of conventional columns can be used to separate an unstabilized naphtha stream to produce an aromatics-free light naphtha stream as a feed for a catalytic cracking unit for olefins production.
Claims6
A catalytic cracking system configured for olefins production where the system comprises:
- a reactor/regenerator adapted to receive a feed comprising at least one component selected from the group consisting of gas oils, deasphalted oil (DAO), atmospheric residue, and an aromatics-free C5/C6-rich light naphtha feed, the reactor/regenerator comprising a high-value product stream comprising light and heavy paraffinic hydrocarbons, naphthenic, aromatics and olefinic hydrocarbons;
- a main fractionator configured to receive and fractionate the high-value product stream, and to produce product streams comprising:
- a fractionator vapor product stream comprising fuel gas, C3/C4, and light naphtha;
- a wild naphtha product stream comprising C3/C4 and naphtha;
- and
- a fractionator liquid products stream comprising at least one component selected from the group consisting of heavy naphtha, light cycle oil (LCO), and slurry;
- and
- a vapor recovery unit (VRU) comprising a wet gas compressor, a primary absorber, a stripper, a sponge absorber, and a dividing wall column (DWC), wherein the VRU is configured to receive the fractionator vapor product stream and wild naphtha product streams and to separate them to give an aromatics-free C5/C6-rich product stream, where the aromatics-free C5/C6-rich product stream is directed as an aromatics-free C5/C6-rich light naphtha feed recycle to the reactor/regenerator,
- wherein the DWC is configured to receive bottoms liquid directly from the stripper and comprises:
- a pre-fractionator section;
- a main fractionator section;
- a side draw that is the aromatics-free C5/C6-rich product stream;
- a bottoms product stream that is split between a heavy naphtha product and a feed to the primary absorber;
- and
- a top product stream comprising C3/C4.
12 more elements
A catalytic cracking system configured for olefins production where the system comprises:
- a reactor/regenerator adapted to receive a feed comprising at least one component selected from the group consisting of gas oils, deasphalted oil (DAO), atmospheric residue, and an aromatics-free C5/C6-rich light naphtha feed, the reactor/regenerator comprising a high-value product stream comprising light and heavy paraffinic hydrocarbons, naphthenic, aromatics and olefinic hydrocarbons;
- a main fractionator configured to receive and fractionate the high-value product stream, the main fractionator configured to produce product streams comprising:
- a fractionator vapor product stream comprising fuel gas, C3/C4, and light naphtha;
- a wild naphtha product stream comprising C3/C4 and naphtha;
- and
- a fractionator liquid products stream comprising at least one component selected from the group consisting of heavy naphtha, light cycle oil (LCO), and slurry;
- and
- a vapor recovery unit (VRU) comprising a wet gas compressor, a primary absorber, a stripper, a sponge absorber, and a dividing wall column (DWC), wherein the VRU is configured to receive the fractionator vapor product stream and wild naphtha product streams and separate them to give an aromatics-free C5/C6-rich product stream, where the aromatics-free C5/C6-rich product stream is directed as an aromatics-free C5/C6-rich light naphtha feed recycle to the reactor/regenerator,
- wherein the DWC is configured to receive bottoms liquid directly from the stripper and comprises:
- a pre-fractionator section;
- a main fractionator section;
- a side draw that is the aromatics-free C5/C6-rich product stream;
- a bottoms product stream comprising a cat cracked naphata gasoline blendstock, the bottoms product stream being split between a heavy naphtha product and a feed to the primary absorber;
- and
- a top product stream comprising C3/C4.
12 more elements
A catalytic cracking system configured for olefins production where the system comprises:
- a reactor/regenerator adapted to receive a feed comprising at least one component selected from the group consisting of gas oils, deasphalted oil (DAO), atmospheric residue, and an aromatics-free C5/C6-rich light naphtha feed, the reactor/regenerator comprising a high-value product stream comprising light and heavy paraffinic hydrocarbons, naphthenic, aromatics and olefinic hydrocarbons;
- a main fractionator configured to receive and fractionate the high-value product stream, the main fractionator configured to produce product streams comprising:
- a fractionator vapor product stream comprising fuel gas, C3/C4, and light naphtha;
- a wild naphtha product stream comprising C3/C4 and naphtha;
- and
- a fractionator liquid products stream comprising at least one component selected from the group consisting of heavy naphtha, light cycle oil (LCO), and slurry;
- and
- a vapor recovery unit (VRU) comprising a wet gas compressor, a primary absorber, a stripper, a sponge absorber, and a dividing wall column (DWC), wherein the VRU is configured to receive the fractionator vapor product stream and wild naphtha product streams and separate them to give an aromatics-free C5/C6-rich product stream, where the aromatics-free C5/C6-rich product stream is directed as an aromatics-free C5/C6-rich light naphtha feed recycle to the reactor/regenerator,
- wherein the DWC is configured to receive bottoms liquid directly from the stripper and comprises:
- a pre-fractionator section;
- a main fractionator section;
- a side draw that is the aromatics-free C5/C6-rich product stream;
- a bottoms product stream that is split between a heavy naphtha product and feed to the primary absorber;
- and
- a top product stream comprising C3/C4 directed to a depropanizer.
12 more elements
Dependencies are inferred from the claim text.