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US 12,312,289 B2Granted
Dividing wall column in alkylation process for reactor recycle and product separation
AssigneeKellogg Brown & Root LLC
InventorsBhari Bhujan Singh, Ian Charles Elgey
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Abstract
A dividing wall column is used in an alkylation process flow scheme to fractionate an alkylate reactor effluent to produce an iso-butane-rich stream as a recycle feed for the alkylation reactor while also separating iso-butane, normal butane and alkylate as separate product streams depending on the reactor effluent composition. In an optional embodiment, the scheme may contain propane.
Claims14
An alkylation process comprising:
- feeding an olefin stream and a make-up iso-butane to an alkylation reaction/regeneration section to produce an alkylate reactor effluent;
- feeding the alkylate reactor effluent and an additional make-up iso-butane to a dividing wall column (DWC) to separate the alkylate reactor effluent into a plurality of DWC effluent streams comprising:
- an iso-butane recycle stream,
- a n-butane product stream, and
- an alkylate product stream;
- and
- recycling at least a portion of the iso-butane recycle stream to the alkylation reaction/regeneration section.
4 more elements
An alkylation process comprising:
- feeding an alkylate reactor effluent containing propane to a pre-fractionator section of a dividing wall column (DWC);
- routing a DWC overhead product containing propane to a depropanizer column;
- drawing an iso-butane recycle stream from a first side draw of a main-fractionator section of the DWC;
- recycling the iso-butane recycle stream to an alkylation reaction/regeneration section;
- drawing an n-butane product stream from a second side draw of the main-fractionator section of the DWC or of a bottoms section of the DWC, wherein the second side draw is selected from the group consisting of vapor, liquid, or a combination thereof;
- and
- drawing an alkylate product stream as a bottoms product of the DWC.
4 more elements
Dependencies are inferred from the claim text.