Process for separating propane and propylene using a distillation column and a membrane separation column
AssigneeIfp Energies Nouvelles
InventorsNathalie Cougard, Arnaud Baudot, Vincent Coupard
Life of this patent
Estimating the term…
Abstract
Process for separating propane and propylene using a distillation column and at least one membrane separation unit constituted by one or more modules operating in series, said membrane separation unit being placed either upstream, or downstream, or upstream and downstream of the distillation column.
Claims7
A process comprising separating propane and propylene in a distillation column and at least one separation unit constituted by several membrane modules operating in series, said separation unit or units being placed either upstream, or downstream, or upstream and downstream of the distillation column, said membrane module or modules comprises polymer membranes having a propylene permeability greater than 0.1 barrer and propylene/propane selectivity greater than 5, said membrane module or modules operating under the following pervaporation conditions provided at the inlet to each membrane module:
- feedstock pressure comprised between 20 and 47 bar and feedstock temperature between 20° C. and 92° C., said separation unit or units operating with a difference in pressure such that a permeate is at a minimum pressure of 10 bar and
- wherein the permeate is reinjected either upstream, or downstream, or upstream and downstream of the distillation column in vapour phase.
A process comprising separating propane and propylene in a distillation column and at least one separation unit constituted by several membrane modules operating in series, said separation unit or units being placed either upstream, or downstream, or upstream and downstream of the distillation column, said membrane module or modules provided with polymer membranes with propylene permeability greater than 0.1 barrer and propylene/propane selectivity greater than 5, said module or modules operating under the following supercritical conditions, provided at the inlet to each membrane module:
- feedstock pressure comprised between 47 and 100 bar and feedstock temperature between 92° C. and 200° C., said separation unit or units operating with a difference in pressure such that the permeate is at a minimum pressure of 10 bar and
- wherein the permeate is reinjected either upstream, or downstream, or upstream and downstream of the distillation column in vapour phase.
Dependencies are inferred from the claim text.