Regenerable Non-Aqueous Basic Immobilized Amine Slurries for Removal of Carbon Dioxide (CO2) from a Gaseous Mixture

Regenerable Non-Aqueous Basic Immobilized Amine Slurries for Removal of Carbon Dioxide (CO₂) from a Gaseous Mixture

Mon, 09/03/2018 - 12:00

USPN 10,765,997

Opportunity

The innovation represents a BIAS particle sorbent suspended in a non-aqueous fluid carrier (slurry) that is capable of CO₂ sorption, is easy to incorporate into established power plants, and can minimize energy and infrastructure requirements.

Challenge

Carbon sequestration can reduce the emissions of CO₂ from large point sources and holds potential to provide deep reductions in greenhouse gas emissions. Amine-based solid sorbents are effective and economical agents for CO₂ capture from gaseous mixtures. However, because of the high concentration of CO₂ in many feed streams, a large quantity of the gas often reacts with the sorbent exothermically to produce excessive heat, which must be removed from the sorbent to prevent temperature instability within the reactor and to eliminate potential degradation of the sorbent. Reducing the damage to sorbents with this technology and method can increase efficiency and reduce replacement costs faced by industries.

Overview

NETL researchers have developed a technology and methods featuring a slurry comprised of BIAS sorbents suspended in a silicone oil. The method calls for the slurry to contact a gaseous mixture. The

resulting CO₂ laden sorbent slurry removes the absorbed CO₂ from the laden sorbent slurry. The contact can occur via a scrubber operation, closed chamber, packed bed reactor, slurry bubble reactor, or stirred reactor.

Advantages

The conventional scrubbing system that is the comparative baseline for all other capture technologies is monoethanolamine (MEA) scrubbing. This wet scrubbing process removes CO₂ in an absorber then regenerates the spent scrubbing liquor in a vessel by indirectly heating the solution with plant steam. The process has several disadvantages including low CO₂ working capacity, corrosiveness to the equipment, susceptibility of MEA to poisoning, and most notably, a high energy requirement for CO₂ release from an aqueous solution. These disadvantages result in a costly CO₂ remediation technology. The NETL innovation increases process efficiencies and reduces overall costs.

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