Method for the recovery of low purity carbon dioxide
OwnerAlbert N. Heichbergerinventor
Life of this patent
Estimating the term…
Abstract
A process for the economical recovery of carbon dioxide from a gas stream containing less than 85% carbon dioxide, by cooling the contaminating gas to remove water vapor, compressing the cooled gas to an elevated temperature and pressure, and drying the gas to a dewpoint of not more than about -85.degree. F.; condensing and removing the carbon dioxide from the dried compressed gas; and heating the remaining noncondensed gas mixture and expanding it to produce and recover kinetic energy and a cooled gas mixture.
Claims17
A process for the recovery of carbon dioxide from a gaseous mixture containing water, noncondensible gas, and less than about 85% carbon dioxide, the process which comprises:
- a. cooling the gaseous mixture to remove nearly all of the water;
- b. compressing the cooled gaseous mixture to an elevated temperature and pressure and drying the compressed gaseous mixture to a dewpoint of not higher than about -85.degree. F.;
- c. cooling the compressed dried gas to liquefy said carbon dioxide therein and to separate the liquid carbon dioxide from the noncondensed gas;
- and
- d. heating said noncondensed gas and expanding said noncondensed gas to produce kinetic energy and cooled noncondensed gas, and utilizing said kinetic energy elsewhere.
A process for the recovery of carbon dioxide from a glue gas containing less than 50% carbon dioxide content, which comprises:
- a. cooling said flue gas and removing substantially all of the water therefrom;
- b. compressing the resulting dewatered gas in stages with cooling between compression stages, said compressing being accomplished by a compressor driven by a turbine engine from which hot exhaust gases emanate;
- c. cooling said compressed gas by introducing it into a mass of liquid carbon dioxide to cause condensation of the carbon dioxide in said compressed gas and to allow the remainder of said compressed gas to pass through said liquid carbon dioxide and be collected as noncondensed gas at a temperature of about -60.degree. F.;
- d. passing said noncondensed gas in heat exchange relationship with said compressed gas of step c. to accomplish said cooling;
- e. passing said noncondensed gas resulting from step d. in heat exchange relationship with said flue gas to accomplish at least a portion of said cooling in step a.;
- f. passing said noncondensed gas resulting from step e. in heat exchange relationship with said hot exhaust gases of step b.;
- and
- g. expanding said noncondensed gas resulting from step f. through a turbo-expander to produce kinetic energy for use in driving an electric generator.
A process for the recovery of carbon dioxide from a flue gas containing less than 50% carbon dioxide content which comprises:
- a. cooling said flue gas and removing substantially all of the water therefrom;
- b. compressing the resulting dewatered gas in stages with cooling between compression stages;
- c. cooling the resulting compressed dewatered flue gas and introducing it into a mass of liquid carbon dioxide to cause condensation of the carbon dioxide in said compressed gas and to allow the remainder of said compressed gas to pass through said liquid carbon dioxide and be collected as noncondensed gas at a temperature of about -69.degree. F.;
- d. passing said noncondensed gas in heat exchange relationship with said compressed gas of step c. to accomplish said cooling;
- e. passing said noncondensed gas resulting from step d. in heat exchange relationship with said flue gas to accomplish at least a portion of said cooling in step a.;
- f. passing said noncondensed gas resulting from step e. through a turbo-expander to produce a cooled expanded noncondensed gas;
- g. passing said cooled expanded noncondensed gas in heat exchange relationship with said compressed gas from step b., and returning the resulting noncondensed gas to the source of said flue gas introduced into step a.
Dependencies are inferred from the claim text.