Multifeed Flash Stripper

Physical Sciences : Chemical

Available for licensing

Inventors

  • Gary Rochelle, Ph.D. , Chemical Engineering
  • Tarun Madan , Chemical Engineering

Background/unmet need

As concerns of global climate changes spark initiatives to reduce carbon dioxide emissions, economic removal of CO2 from gas streams is becoming increasingly important.

In a typical CO2 removal process, absorption is used to remove CO2 from a combustion gas, and stripping is subsequently used to regenerate the solvent and capture the CO2 contained in the solvent.

To effect the regeneration of the absorbent solution, the rich solvent drawn off from the bottom of the absorption column is introduced into the upper half of a stripping column, and the rich solvent is maintained at its boiling point under pressure in this column. The steam consumption of the stripper, however, is large and will be a major disadvantage. Stripper complexity and advanced stripper configurations have been studied in the past to minimize the energy requirement of amine scrubbing for carbon capture.

Increasing the reversibility of the process using advanced configurations improves the energy performance. This complexity can be increased by using recycles, better heat recovery, splits, multiple pressure stages, and other features.

Invention Description

Researchers at The University of Texas at Austin provided a novel multifeed flash stripper process and configuration for regenerating amine solvent for CO2 capture from combustion gases.

It uses a single-stage flash at the bottom of a stripping section. One or more bypasses of warm or hot rich solvent are fed to appropriate point in the packed or trays in the stripping section to use the vapor form the flash for additional stripping and recover waste stripping steam heat more reversibly.

Benefits/Advantages

  • Recovery of waste stripper steam heat
  • More regenerated amine solution
  • Cost-effective regeneration

Features

  • Recovery of aqueous amine solvent using less heat
  • Simpler equipment configuration

Market potential/applications

CO2 capture by power industries; CO2 removal from natural gas; petroleum and chemical industries

Development Stage

Proof of concept

IP Status

  • 1 foreign patent application filed
  • 2 foreign patents issued
  • 1 U.S. patent issued: 9,956,505