Method and system to reclaim functional sites on a sorbent contaminated by heat stable salts
First Claim
Patent Images
1. A method, comprising:
- receiving a gas stream, the gas stream comprising a target gas component and at least one acid gas, the at least one acid gas being different from the target gas component;
contacting the gas stream with a sorbent to remove at least a portion of the target gas component to form a purified gas stream and a loaded sorbent comprising the removed target gas component, the sorbent also removing and the loaded sorbent also comprising a portion of the at least one acid gas;
removing at least most of the removed target gas component from the loaded sorbent to form a lean sorbent comprising at least most of the removed portion of the at least one acid gas and/or a salt thereof; and
contacting the lean sorbent with a regeneration solution to remove at least most of the removed portion of the at least one acid gas and/or a salt thereof and form for recycle to the gas stream contacting step the sorbent,wherein the target gas component is a carbon oxide, wherein the at least one acid gas is one or more of a sulfur oxide, a nitrogen oxide and hydrogen sulfide, wherein the sorbent is an amine-base sorbent, and wherein the regeneration solution has a pH of at least pH 10.
6 Assignments
0 Petitions
Accused Products
Abstract
The objective of this invention is to develop a method to reclaim functional sites on a CO2 sorbent that have reacted with an acid gas (other than CO2) to form heat stable salts (HSS). HSS are a significant concern for dry sorbent based CO2 capture because over time the buildup of HSS will reduce the overall functionality of the CO2 sorbent. A chemical treatment can remove the non-CO2 acid gas and reclaim functional sites that can then be used for further CO2 adsorption.
394 Citations
18 Claims
-
1. A method, comprising:
-
receiving a gas stream, the gas stream comprising a target gas component and at least one acid gas, the at least one acid gas being different from the target gas component; contacting the gas stream with a sorbent to remove at least a portion of the target gas component to form a purified gas stream and a loaded sorbent comprising the removed target gas component, the sorbent also removing and the loaded sorbent also comprising a portion of the at least one acid gas; removing at least most of the removed target gas component from the loaded sorbent to form a lean sorbent comprising at least most of the removed portion of the at least one acid gas and/or a salt thereof; and contacting the lean sorbent with a regeneration solution to remove at least most of the removed portion of the at least one acid gas and/or a salt thereof and form for recycle to the gas stream contacting step the sorbent, wherein the target gas component is a carbon oxide, wherein the at least one acid gas is one or more of a sulfur oxide, a nitrogen oxide and hydrogen sulfide, wherein the sorbent is an amine-base sorbent, and wherein the regeneration solution has a pH of at least pH 10. - View Dependent Claims (2)
-
-
3. A method comprising:
-
receiving a gas stream, the gas stream comprising a target gas component and at least one acid gas, the at least one acid gas being different from the target gas component; contacting the gas stream with a sorbent to remove at least a portion of the target gas component to form a purified gas stream and a loaded sorbent comprising the removed target gas component, the sorbent also removing and the loaded sorbet also comprising a portion of the at least one acid gas; removing at least most of the removed target gas component from the loaded sorbent to form a lean sorbent comprising at least most of the removed portion of the at least one acid gas and/or a salt thereof; and contacting the lean sorbent with a regeneration solution to remove at least most of the removed portion of the at least one acid gas and/or a salt thereof and form for recycle to the gas stream contacting step the sorbent, wherein bonds between adjacent sorbent components and between the sorbent components and an adjacent sorbent substrate are stronger than bonds between the sorbent component and the target gas component and between the sorbent component and the at least one acid gas and/or salt thereof. - View Dependent Claims (4, 5)
-
-
6. A method, comprising:
-
receiving a gas stream, the gas stream comprising a target gas component and at least one acid gas, the at least one acid gas being different from the target gas component; contacting the gas stream with a sorbent to remove at least a portion of the target gas component to form a purified gas stream and a loaded sorbent comprising the removed target gas component, the sorbent also removing and the loaded sorbent also comprising a portion of the at least one acid gas; removing at least most of the removed target gas component from the loaded sorbent to form a lean sorbent comprising at least most of the removed portion of the at least one acid gas and/or a salt thereof; contacting the lean sorbent with a regeneration solution to remove at least most of the removed portion of the at least one acid gas and/or a salt thereof and form for recycle to the gas stream contacting step the sorbent; and after contact of the lean sorbent with the regeneration solution, contacting the sorbent with a wash solution to remove any deposit on the sorbent after contact with the regeneration solution.
-
-
7. A system, comprising:
-
a gas component separator configured to (a) receive a gas stream, the gas stream comprising a target gas component and at least one acid gas, the at least one acid gas being different from the target gas component, and (b) contact the gas stream with a sorbent to remove at least a portion of the target gas component and a portion of the at least one acid gas to form a purified gas stream and a loaded sorbent comprising the removed target gas and the removed acid gas; a sorbent regenerator configured to remove at least most of the removed target gas component from the loaded sorbent to form a lean sorbent comprising at least most of the removed acid gas and/or a salt thereof; and a regeneration vessel configured to contact the lean sorbent with a regeneration solution to remove at least most of the removed acid gas and/or a salt thereof and form for recycle to the gas component separator the sorbent, wherein the target gas component is a carbon oxide, wherein the at least one acid gas is one or more of a sulfur oxide, a nitrogen oxide and hydrogen sulfide, wherein the sorbent is an a mine-base sorbent, and wherein the regeneration solution has a pH of at least about pH 10. - View Dependent Claims (8, 9, 10)
-
-
11. A system, comprising:
-
a gas component separator configured to (a) receive a gas stream, the gas stream comprising a target gas component and at least one acid gas, the at least one acid gas being different from the target gas component, and (b) contact the gas stream with a sorbent to remove at least a portion of the target gas component and a portion of the at least one acid gas to form a purified gas stream and a loaded sorbent comprising the removed target gas and the removed acid gas; a sorbent regenerator configured to remove at least most of the removed target gas component from the loaded sorbent to form a lean sorbent comprising at least most of the removed one acid gas and/or a salt thereof; a regeneration vessel configured to contact the lean sorbent with a regeneration solution to remove at least most of the removed acid gas and/or a salt thereof and form, for recycle to the gas component separator, the sorbent; and a controller comprising microprocessor readable and executable instructions stored on a non-transient and tangible computer readable medium that, when executed, determine a concentration of the target gas component and/or at least one acid gas in the received gas stream and/or purified gas stream and, when a determined relationship involving the determined concentration of the target gas component and/or at least one acid gas in the received gas stream and/or purified gas stream is deemed to exist, initiate regeneration of the loaded sorbent.
-
-
12. In a system to remove a target gas component from a gas stream, the gas stream comprising the target gas component and at least one acid gas and the at least one acid gas being different from the target gas component, by contacting the gas stream with a sorbent to remove at least a portion of the target gas component to form a purified gas stream and a target gas component loaded sorbent, the sorbent also removing a portion of the at least one acid gas, a tangible and non-transient computer readable medium comprising microprocessor readable and executable instructions that, when executed, perform operations comprising:
determine a concentration of a target gas component and/or at least one acid gas in at least one of the gas stream and the purified gas stream and, when a determined relationship involving the determined concentration of the target gas component and/or at least one acid gas in the at least one of the gas stream and the purified gas stream is deemed to exist, cause the following sub-operations to be performed; removing at least most of the removed at least a portion of the target gas component from the loaded sorbent to form a lean sorbent, the lean sorbent comprising at least most of the removed portion of the at least one acid gas and/or a salt thereof; and contacting the lean sorbent with a regeneration solution to remove at least most of the removed portion of the at least one acid gas and/or a salt thereof and form a fully treated sorbent for recycle. - View Dependent Claims (13, 14, 15, 16, 17, 18)
Specification