Configurations and methods for acid gas absorption and solvent regeneration
First Claim
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1. A plant comprising:
- A solvent regenerator having a upper section and a lower section;
wherein the upper section has a first rich solvent inlet that is configured to provide a rich solvent reflux, and a second rich solvent inlet that is configured to provide a heated rich solvent regenerator feed;
wherein the lower section is configured to produce a lean solvent from both the rich solvent reflux and the heated rich solvent regenerator feed;
a heater operationally coupled to the regenerator and configured to heat a portion of a rich solvent to thereby provide the heated rich solvent regenerator feed;
a second regenerator that is configured to receive a portion of the lean solvent from the lower section of the solvent regenerator and to produce a steam-containing overhead product and an ultra-lean solvent from the lean solvent;
wherein the second regenerator is coupled to the solvent regenerator such as to deliver the steam-containing overhead product to solvent regenerator to thereby provide at least a portion of the stripping steam required in the solvent regenerator; and
an absorber having an upper section and a lower section, wherein absorber is configured to receive the ultra-lean solvent from the second regenerator and the lean solvent from the solvent regenerator in the respective upper and lower sections.
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Abstract
Contemplated configurations and methods include a solvent regenerator (58) that has an upper (93) and a lower stripping section (94). Cooled rich solve is used as reflux while heated rich solvent (11) is used as a source of stripping agent in the upper section (91). A reboiler (62) in the lower section provides further stripping agent, hi especially preferred configurations, a portion of lean solved from the regenerator (58) is further stripped in a separate or integrated regenerator (62) to form an ultra-lean solvent. Both lean and ultra-lean solvents are preferably used in a two-stage absorber (52) to thereby from the rich solvent and an offgas that is very low in acid gas.
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Citations
12 Claims
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1. A plant comprising:
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A solvent regenerator having a upper section and a lower section; wherein the upper section has a first rich solvent inlet that is configured to provide a rich solvent reflux, and a second rich solvent inlet that is configured to provide a heated rich solvent regenerator feed; wherein the lower section is configured to produce a lean solvent from both the rich solvent reflux and the heated rich solvent regenerator feed; a heater operationally coupled to the regenerator and configured to heat a portion of a rich solvent to thereby provide the heated rich solvent regenerator feed; a second regenerator that is configured to receive a portion of the lean solvent from the lower section of the solvent regenerator and to produce a steam-containing overhead product and an ultra-lean solvent from the lean solvent; wherein the second regenerator is coupled to the solvent regenerator such as to deliver the steam-containing overhead product to solvent regenerator to thereby provide at least a portion of the stripping steam required in the solvent regenerator; and an absorber having an upper section and a lower section, wherein absorber is configured to receive the ultra-lean solvent from the second regenerator and the lean solvent from the solvent regenerator in the respective upper and lower sections. - View Dependent Claims (2, 3, 4)
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5. A method of regenerating a solvent, comprising:
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feeding a first portion of a rich solvent as reflux to a first section of a regenerator, and feeding a heated second portion of the rich solvent to the first section of the regenerator; wherein the second portion has a temperature sufficient to provide at least a portion of stripping medium to the first section; forming in a second section of the regenerator a lean solvent from the first and second portions to thereby regenerate the solvent; feeding a first portion of a bottom product of the regenerator to a second regenerator to thereby form an ultra-lean solvent and a second steam-containing regenerator overhead product; feeding a second portion of the bottom product of the regenerator to a lower section of an absorber as a lean solvent, and feeding the ultra-lean solvent to an upper section of the absorber; and providing the second steam-containing regenerator overhead product to the solvent regenerator to thereby supply at least a portion of the stripping steam required in the solvent regenerator. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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Specification