Gas-absorption process
- Oak Ridge, TN
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for the desired component is circulated through the loop, being passed downwardly through the column, regenerated, withdrawn from a reboiler, and then recycled to the column.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a peak concentration of the desired component is established in the section, and gas rich in that component can be withdrawn therefrom.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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4129425
- OSTI ID:
- 863235
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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withdrawn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
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