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US 4,291,004 AGranted
Process for removing sulfur dioxide from flue gas
AssigneeBetz Laboratories, Inc.
InventorsCraig R. McCaffrey, Gary O. Barraclough
Life of this patent
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Abstract
A process for removing sulfur dioxide from flue gas is disclosed which utilizes, as a scrubber sludge dewatering aid, polyethylene oxide or derivative thereof.
Claims21
A flue gas desulfurization process comprising in sequence:
- (1) contacting sulfur dioxide-containing flue gas with scrubbing liquor to remove sulfur dioxide therefrom and produce scrubber sludge,
- (2) subjecting said scrubber sludge to primary dewatering,
- (3) adding to said scrubber sludge an effective amount as a dewatering aid of polyethylene oxide compound having the formula
- R--CH.sub.2 CH.sub.2 --O--.sub.X H,
- where X is about 2-40 and R is OH, sorbitan monooleate--O--, soya amine, ##STR3## where R.sub.1, R.sub.2 and R.sub.3 are selected from the group consisting of hydrogen and alkyl such that the sum of the total number of carbon atoms in R.sub.1, R.sub.2 and R.sub.3 is an average of from about 8 to 20, and
- (4) subjecting said scrubber sludge to secondary dewatering.
3 more elements
A flue gas desulfurization process comprising in sequence:
- (1) contacting sulfur dioxide-containing flue gas with scrubbing liquor to remove sulfur dioxide therefrom and produce scrubber sludge,
- (2) subjecting said scrubber sludge to primary dewatering,
- (3) adding to said scrubber sludge an effective amount as a dewatering aid of polyethylene oxide compound having the formula:
- ##STR4## where R.sub.1, R.sub.2 and R.sub.3 are selected from the group consisting of hydrogen and alkyl such that the sum of the total number of carbon atoms in R.sub.1, R.sub.2 and R.sub.3 is from about 8 to 20 and X is from about 1 to 10, and
- (4) subjecting said scrubber sludge to secondary dewatering.
2 more elements
A flue gas desulfurization process comprising in sequence:
- (1) contacting sulfur dioxide-containing flue gas with scrubbing liquor to remove sulfur dioxide therefrom and produce scrubber sludge,
- (2) subjecting said scrubber sludge to primary dewatering, PG,28
- (3) adding to said scrubber sludge an effective amount as a dewatering aid, polyethylene glycol in liquid hydrocarbon solvent, in an amount of from about 0.5 pounds to about 15 pounds/ton of said scrubber sludge, and
- (4) subjecting said scrubber sludge to secondary dewatering.
1 more element
Dependencies are inferred from the claim text.