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US 12,570,589 B2Granted
Membrane process for butadiene extraction solvent purification
AssigneeExxonMobil Technology and Engineering Company
InventorsAndrew J. Rohleder, Bhupender S. Minhas, David B. Spry, Michelle E. Dose, Neel Rangnekar
Life of this patent
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Abstract
The present disclosure is directed to 1,3-butadiene extraction and steam cracking recovery systems, more particularly, to systems and methods for removing tar from the solvent loop of such systems using a membrane.
Claims17
A method for removing tar from the solvent stream of an extraction unit, comprising:
- feeding a solvent stream containing tar into a solvent recycle loop comprising a membrane unit;
- preferentially permeating solvent in the solvent stream via the membrane unit to separate a retentate stream comprising solvent and a greater wt % of tar than a wt % of tar in the solvent stream from a permeate stream comprising tar and a greater wt % of solvent than a wt % of solvent in the solvent stream;
- feeding the permeate stream into the solvent recycle loop for recirculation within the solvent recycle loop, and
- processing the retentate stream in a tar kettle, the processing comprising depositing tar into the tar kettle for removal from the extraction unit, the processing producing a tar kettle-treated stream.
1 more element
A method for removing tar from the solvent stream of an extraction unit, comprising:
- feeding a solvent stream containing tar and dimethylformamide into a solvent recycle loop comprising a membrane unit;
- preferentially permeating dimethylformamide in the solvent stream via the membrane unit to separate a retentate stream comprising a greater wt % of tar than a wt % of tar in the solvent stream from a permeate stream comprising a greater wt % of dimethylformamide than a wt % of dimethylformamide in the solvent stream;
- and
- feeding the permeate stream into the solvent recycle loop for recirculation within the solvent recycle loop.
1 more element
Dependencies are inferred from the claim text.