Method and system to control and maintain product quality for an olefin membrane separation
AssigneeUop LLC
InventorsChunqing Liu, Trung Pham, Charles P Luebke, Carl Liskey
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Abstract
A process and system to control the final product quality in a system for separating olefins and paraffins in a membrane system. A small finishing membrane stage is added to an existing membrane system that takes a slip stream from the product, purifies it to a very high concentration of propylene and blends it back into the product stream.
Claims15
A process for producing a propylene stream comprising sending a stream comprising about 72-85 mol % propylene to a main membrane unit to produce a first permeate stream comprising about 95-99.5 mol % propylene and a first retentate stream comprising about 40-65 mol % propylene, sending a portion of said first permeate stream to a finishing membrane unit to produce a second permeate stream comprising about 99.5 to 99.99 mol % propylene and a second retentate stream comprising about 90-96 mol % propylene;
- and combining said second permeate stream with a portion of said first permeate stream to produce a product stream comprising about 99.5-99.9 mol % propylene.
Dependencies are inferred from the claim text.