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1. WO2020006226 - PROCESS FOR SEPARATION OF PROPYLENE FROM A LIQUEFIED PETROLEUM GAS STREAM

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

CLAIMS:

1. A process, comprising:

passing a feed stream to a dividing wall column to produce an overhead stream; a first side draw stream; a second side draw stream on the opposite side of the

dividing wall from the feed stream; and a product stream;

flashing the overhead stream to produce an off gas stream and an overhead liquid stream;

passing the overhead liquid stream back to the dividing wall column; passing the first side draw stream to a treatment unit to produce a treated stream;

passing a first portion of the second side draw stream back to the dividing wall

column and passing a second portion of the second side draw stream as a propane product;

passing the treated stream to a membrane unit; and

passing a retentate stream from the membrane unit back to the dividing wall column and passing a permeate stream from the membrane unit to produce a polymer grade propylene stream.

2. The process of claim 1, wherein the feed stream may be a treated liquid petroleum gas stream from a caustic mercaptan oxidation process.

3. The process of claim 1, wherein the dividing wall column comprises 40 to 80 trays.

4. The process of claim 1, wherein the membrane unit comprises a plurality of membranes wherein said membranes are facilitated transport membranes comprising a nanoporous support membrane, a hydrophilic polymer inside the nanopores on a skin layer surface of the nanoporous support membrane, a thin, nonporous, hydrophilic polymer layer coated on the surface of the nanoporous support membrane, and metal salts incorporated in the hydrophilic polymer layer coated on the surface of the nanoporous support membrane and the hydrophilic polymer inside the nanopores.

5. The process of claim 1, wherein the membrane unit operates at 30-80°C, under 552-2068 kPa (80-300 psig) feed pressure, with a humidity level at 40-100%.

6. The process of claim 1, wherein the treatment unit is configured to remove contaminants comprising sulfur, caustic water, phosphine, arsine, methyl acetylene, and propadiene.

7. The process of claim 1 further comprising at least one of:

sensing at least one parameter of the process and generating a signal or data from the sensing;

generating and transmitting a signal; or

generating and transmitting data.