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Title: Gas-absorption process

Abstract

This invention is an improved gas-absorption process for the recovery of a desired component from a feed-gas mixture containing the same. In the preferred form of the invention, the process operations are conducted in a closed-loop system including a gas-liquid contacting column having upper, intermediate, and lower contacting zones. A liquid absorbent for the desired component is circulated through the loop, being passed downwardly through the column, regenerated, withdrawn from a reboiler, and then recycled to the column. A novel technique is employed to concentrate the desired component in a narrow section of the intermediate zone. This technique comprises maintaining the temperature of the liquid-phase input to the intermediate zone at a sufficiently lower value than that of the gas-phase input to the zone to effect condensation of a major part of the absorbent-vapor upflow to the section. This establishes a steep temperature gradient in the section. The stripping factors below this section are selected to ensure that virtually all of the gases in the downflowing absorbent from the section are desorbed. The stripping factors above the section are selected to ensure re-dissolution of the desired component but not the less-soluble diluent gases. As a result, a peak concentration ofmore » the desired component is established in the section, and gas rich in that component can be withdrawn therefrom. The new process provides important advantages. The chief advantage is that the process operations can be conducted in a single column in which the contacting zones operate at essentially the same pressure.« less

Inventors:
 [1];  [1]
  1. (Oak Ridge, TN)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
863235
Patent Number(s):
US 4129425
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
gas-absorption; process; improved; recovery; desired; component; feed-gas; mixture; containing; preferred; form; operations; conducted; closed-loop; including; gas-liquid; contacting; column; upper; intermediate; zones; liquid; absorbent; circulated; loop; passed; downwardly; regenerated; withdrawn; reboiler; recycled; novel; technique; employed; concentrate; narrow; section; zone; comprises; maintaining; temperature; liquid-phase; input; sufficiently; value; gas-phase; effect; condensation; major; absorbent-vapor; upflow; establishes; steep; gradient; stripping; factors; below; selected; ensure; virtually; gases; downflowing; desorbed; re-dissolution; less-soluble; diluent; result; peak; concentration; established; gas; rich; therefrom; provides; advantages; chief; advantage; single; operate; essentially; pressure; liquid absorbent; process provides; temperature gradient; mixture containing; gas mixture; preferred form; process operations; phase input; desired component; improved gas; contacting column; contacting zone; comprises maintaining; diluent gas; gas-liquid contacting; gas-absorption process; sorption process; absorption process; /95/

Citation Formats

Stephenson, Michael J., and Eby, Robert S.. Gas-absorption process. United States: N. p., 1978. Web.
Stephenson, Michael J., & Eby, Robert S.. Gas-absorption process. United States.
Stephenson, Michael J., and Eby, Robert S.. Sun . "Gas-absorption process". United States. https://www.osti.gov/servlets/purl/863235.
@article{osti_863235,
title = {Gas-absorption process},
author = {Stephenson, Michael J. and Eby, Robert S.},
abstractNote = {This invention is an improved gas-absorption process for the recovery of a desired component from a feed-gas mixture containing the same. In the preferred form of the invention, the process operations are conducted in a closed-loop system including a gas-liquid contacting column having upper, intermediate, and lower contacting zones. A liquid absorbent for the desired component is circulated through the loop, being passed downwardly through the column, regenerated, withdrawn from a reboiler, and then recycled to the column. A novel technique is employed to concentrate the desired component in a narrow section of the intermediate zone. This technique comprises maintaining the temperature of the liquid-phase input to the intermediate zone at a sufficiently lower value than that of the gas-phase input to the zone to effect condensation of a major part of the absorbent-vapor upflow to the section. This establishes a steep temperature gradient in the section. The stripping factors below this section are selected to ensure that virtually all of the gases in the downflowing absorbent from the section are desorbed. The stripping factors above the section are selected to ensure re-dissolution of the desired component but not the less-soluble diluent gases. As a result, a peak concentration of the desired component is established in the section, and gas rich in that component can be withdrawn therefrom. The new process provides important advantages. The chief advantage is that the process operations can be conducted in a single column in which the contacting zones operate at essentially the same pressure.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1978},
month = {Sun Jan 01 00:00:00 EST 1978}
}

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