PROCESS FOR THE REMOVAL OF CARBON DIOXIDE FROM GAS STREAMS
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Accused Products
Abstract
A process for the removal and recovery of carbon dioxide from a gaseous stream, in particular the removal and recovery of carbon dioxide, and optionally hydrogen sulphide, from a natural and/or synthesis gas stream. Furthermore, the present invention provides for the release of the removed and recovered carbon dioxide, and optionally hydrogen sulphide, at an elevated pressure, thereby reducing the high carbon dioxide compression costs associated with further chemical processing e.g. for under-ground carbon sequestration and/or for subsurface enhanced hydrocarbon recovery and/or for the manufacture of urea.
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Citations
30 Claims
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1-16. -16. (canceled)
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17. A method of removing and recovering carbon dioxide from a gaseous stream characterized by the following consecutive steps:
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(i) providing the gaseous feed stream at a temperature of between 20 to −
100°
C. and at a pressure of between 10 to 150 bar; and(ii) contacting said gaseous stream with a methanol stream that is at a temperature of between 20 to −
100°
C. to produce at least two streams, one being a purified gaseous stream, having less than 5 mol % carbon dioxide, and one being a methanol stream rich in carbon dioxide; and(iii) treating said methanol steam rich in carbon dioxide at a pressure of from 5 to 100 bar and at a temperature in the range 100 to 220°
C. in a solvent regeneration unit, to separate and recover respectively a carbon dioxide stream and a liquid methanol stream, at high pressure; and(iv) recovering the purified gaseous stream comprising less than 5 mol % of carbon dioxide from step (ii) at high pressure. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification