Method for removal of carbon dioxide from a process gas
First Claim
1. A method of removing carbon dioxide from a process gas, the method comprising:
- a) allowing an ammoniated solution to enter an absorption arrangement, said absorption arrangement comprising at least a first absorber operating at a temperature between about 10°
C. to 20°
C. (50°
F. to 68°
F.);
b) contacting the ammoniated solution with the process gas in said first absorber, the ammoniated solution capturing at least a part of the carbon dioxide of the process gas;
c) allowing the ammoniated solution to exit the first absorber;
d) cooling the ammoniated solution exiting the first absorber to a temperature between about 0°
C. to 10°
C. (32°
F. to 50°
F.), wherein at least a part of the captured carbon dioxide is precipitated as solid salt;
e) allowing the cooled ammoniated solution to enter a separator, in which separator at least a part of the precipitated solids are removed from the cooled ammoniated solution, after which the cooled ammoniated solution is allowed to exit the separator;
f) heating the cooled ammoniated solution; and
g) allowing the heated ammoniated solution to re-enter the absorption arrangement; and
wherein some liquid solution is also removed together with the solids in the separator, forming a leaving suspension or slurry, which suspension or slurry has a solids content of between about 10% and 20% by weight of the suspension or slurry.
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Accused Products
Abstract
The invention relates to a method of removing carbon dioxide from a process gas, the method comprising: a) allowing an ammoniated solution to enter an absorption arrangement, said absorption arrangement comprising at least a first absorber; b) contacting the ammoniated solution with the process gas in said first absorber, the ammoniated solution capturing at least a part of the carbon dioxide of the process gas; c) allowing the ammoniated solution to exit the absorption arrangement; d) cooling the ammoniated solution, wherein at least a part of the captured carbon dioxide is precipitated as solid salt; e) allowing the cooled ammoniated solution to enter a separator, in which separator at least a part of the precipitated solids are removed from the ammoniated solution, after which the ammoniated solution is allowed to exit the separator; f) heating the ammoniated solution; and g) allowing the heated ammoniated solution to re-enter the absorption arrangement. The invention also relates to a carbon dioxide removal system.
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Citations
11 Claims
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1. A method of removing carbon dioxide from a process gas, the method comprising:
-
a) allowing an ammoniated solution to enter an absorption arrangement, said absorption arrangement comprising at least a first absorber operating at a temperature between about 10°
C. to 20°
C. (50°
F. to 68°
F.);b) contacting the ammoniated solution with the process gas in said first absorber, the ammoniated solution capturing at least a part of the carbon dioxide of the process gas; c) allowing the ammoniated solution to exit the first absorber; d) cooling the ammoniated solution exiting the first absorber to a temperature between about 0°
C. to 10°
C. (32°
F. to 50°
F.), wherein at least a part of the captured carbon dioxide is precipitated as solid salt;e) allowing the cooled ammoniated solution to enter a separator, in which separator at least a part of the precipitated solids are removed from the cooled ammoniated solution, after which the cooled ammoniated solution is allowed to exit the separator; f) heating the cooled ammoniated solution; and g) allowing the heated ammoniated solution to re-enter the absorption arrangement; and wherein some liquid solution is also removed together with the solids in the separator, forming a leaving suspension or slurry, which suspension or slurry has a solids content of between about 10% and 20% by weight of the suspension or slurry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification