Hybrid Process Using a Membrane to Enrich Flue Gas CO₂ with a Solvent-Based Post-Combustion CO₂ Capture System

Authors

Kunlei Liu, University of KentuckyFollow
Reynolds A. Frimpong, University of KentuckyFollow
Kun Liu, University of KentuckyFollow

US Patent Number

9409120

Publication Date

8-9-2016

Abstract

A process for recovery of CO₂ from a post-combustion gas includes pre-concentrating a CO₂ component of the post-combustion flue gas by passing the post-combustion gas through a CO₂-selective membrane module to provide a CO₂-enriched permeate stream and a CO₂-lean reject stream. Next, in a CO₂ absorber, both the CO₂-enriched permeate stream and CO₂ lean reject stream, fed to separate feed locations on the CO₂ absorber, are contacted with a scrubbing solvent to absorb CO₂ and provide a carbon-rich scrubbing solvent. Finally, absorbed CO₂ is stripped from the carbon-rich scrubbing solvent by a two-stage CO₂ stripping system. The CO₂-selective membrane may be a high flux, low pressure drop, low CO₂ selectivity membrane. The two stage stripping system includes a primary CO₂ stripping column for stripping CO₂ from the carbon-rich scrubbing solvent exiting the CO₂ absorber, and a secondary CO₂ stripping column for stripping CO₂ from a carbon-lean scrubbing solvent exiting the primary CO₂ stripping column. Apparatus for CO₂ removal from post-combustion gases in a pulverized coal power plant incorporating the described processes are described.

Assignees

The University of Kentucky Research Foundation, Lexington, KY (US)

Application Number

14/591,392

Filing Date

01/07/2015

Recommended Citation

Liu, Kunlei; Frimpong, Reynolds A.; and Liu, Kun, "Hybrid Process Using a Membrane to Enrich Flue Gas CO₂ with a Solvent-Based Post-Combustion CO₂ Capture System" (2016). Center for Applied Energy Research Faculty Patents. 39.
https://uknowledge.uky.edu/caer_patents/39