Process of using layered double hydroxides as low temperature re

Details Process of using layered double hydroxides as low temperature re Process of using layered double hydroxides as low temperature re

1992-11-16

1994-10-25

Straub, Gary P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

42324406, 42324407, 42324408, C01B 1700

Patent

active

053587014

ABSTRACT:
A process for removing noxious sulfur oxides, nitrous oxides, and chlorine from gas streams, particularly from flue gases of coal-burning power plants, using layered double hydroxide (LDH) sorbents are described. The sorbents are particularly useful for SO.sub.2 absorption at temperatures in the range 100 to less than 400.degree. C. The SO.sub.2 gas absorbs into the hydrotalcite structure as SO.sub.3.sup.2- anions by replacing most of the gallery CO.sub.3.sup.2- anions. The adsorbed SO.sub.2 is driven-off by calcination at elevated temperatures (500.degree. C.) and the LDH sorbents are regenerated by hydrolyzing the calcined product optionally in the presence of CO.sub.2 or CO.sub.3.sup.2-.

REFERENCES:
patent: 3699037 (1972-10-01), Annooser et al.
patent: 3796792 (1974-03-01), Miyata et al.
patent: 3835031 (1974-09-01), Bertolacini et al.
patent: 3879523 (1975-04-01), Miyata et al.
patent: 3879525 (1975-04-01), Miyata et al.
patent: 4153534 (1979-05-01), Vasalos
patent: 4454244 (1984-06-01), Woltermann
patent: 4472363 (1984-09-01), Poller et al.
patent: 4774212 (1988-09-01), Drezdon
patent: 4867882 (1989-09-01), O'Neill et al.
patent: 5055199 (1991-10-01), O'Neill et al.
patent: 5079203 (1992-01-01), Pinnavaia et al.
patent: 5114691 (1992-05-01), Pinnavaia et al.
patent: 5114898 (1992-05-01), Pinnavaia et al.
patent: 5116587 (1992-05-01), Pinnavaia et al.
patent: 5142077 (1992-08-01), Martin et al.
S. L. Suib et al., "Layered Double Hydroxides (LDHs)", Solid State Ionics 26 (1988) 77-86.
Komppa, V., "Dry Adsorption Processes for Removal of SO.sub.x and NO.sub.x in Flue Gases--a review", Paperii ja Puu, 5, 401 to 405 (1986), May.
C. Jorgensen, et al., Environmental Progress, vol. 6, pp. 26-32 (1987), Feb., "Evaluation of Sorbents and Additive for SO.sub.2 Removal".
Pinnavaia and Kwon, J. Am. Chem. Soc., 110, 3653 (1988), 25 May, "Pillaring of Layered Double Hydroxides (LOH's) by Polyoxomethalate Anions".
W. T. Reichle, Chemtech, 58 to 63 (1986).
Reichle, J. Catal., 101, 352 to 359 (1986).

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