Solvent reclaiming by sulfate precipitation for CO2 capture
| dc.contributor.advisor | Rochelle, Gary T. | en |
| dc.contributor.committeeMember | Sanchez, Issac C. | en |
| dc.creator | Rafique, Humera Abdul | en |
| dc.date.accessioned | 2012-06-04T16:26:57Z | en |
| dc.date.accessioned | 2017-05-11T22:24:59Z | |
| dc.date.available | 2012-06-04T16:26:57Z | en |
| dc.date.available | 2017-05-11T22:24:59Z | |
| dc.date.issued | 2011-12 | en |
| dc.date.submitted | December 2011 | en |
| dc.date.updated | 2012-06-04T16:27:07Z | en |
| dc.description | text | en |
| dc.description.abstract | Sulfate accumulates in the post-combustion CO₂ capture system and must be removed to re-use amine efficiently. Removal of sulfate from the amine-based postcombustion CO₂ capture system through a solvent reclaiming process may reduce CO₂ capture costs. This work determines the solubility of K₂SO₄ and Na₂SO₄ in 2 to 8 m PZ loaded with CO₂ and develops a thermodynamic and process model for the reclaiming process. At 40°C the solubility of Na2SO₄ in 8 m PZ with a CO₂ loading of 0.3 is 0.3 m Na2SO₄ and that of K₂SO₄ is 0.1 m K₂SO₄. Sulfate solubility in PZ solutions is represented by the empirical models: K₂SO₄: ln(Ksp) = 10.53I[superscript 0.3] - 0.98[PZ][subscript T] -3440/T - 2.42 ; Na₂SO₄: ln(Ksp) = 2.137I[superscript0.3] - .6505[PZ][subscript T] -826/T + 265 where [PZ][subscript T] = 2*(molality of PZ). A K₂SO₄ and Na₂SO₄ solubility thermodynamic model was developed in the eNRTL framework in the Fawkes model for PZ/CO₂/H₂O in Aspen Plus[trademark]. The energy cost of the Na process when removing the equivalent of 100 ppm SO₂ from the flue gas, ranging from $0.1-0.5/ton CO₂, was practically the same as the K process(ranging from $0.1-0.8/ton CO₂). The K₂SO₄ recovered in the process can be used as fertilizer. However, the KOH will still cost $0.6/tonne CO₂. If it is not possible to sell the K₂SO₄ as fertilizer because of the impurities that may be present on the K₂SO₄crystals, the chemical cost of the process would increase to $2/tonne CO₂. The chemical cost for the Na case is $0.7/tonne of CO₂. | en |
| dc.description.department | Chemical Engineering | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.slug | 2152/ETD-UT-2011-12-4402 | en |
| dc.identifier.uri | http://hdl.handle.net/2152/ETD-UT-2011-12-4402 | en |
| dc.language.iso | eng | en |
| dc.subject | CO2 capture | en |
| dc.subject | Solvent reclaiming | en |
| dc.subject | Piperazine | en |
| dc.title | Solvent reclaiming by sulfate precipitation for CO2 capture | en |
| dc.type.genre | thesis | en |