Process for removing sulfur dioxide from flue gas
First Claim
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1. 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
space="preserve" listing-type="equation">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 R1, R2 and R3 are selected from the group consisting of hydrogen and alkyl such that the sum of the total number of carbon atoms in R1, R2 and R3 is an average of from about 8 to 20, and(4) subjecting said scrubber sludge to secondary dewatering.
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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.
33 Citations
21 Claims
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1. A flue gas desulfurization process comprising in sequence:
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(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
space="preserve" listing-type="equation">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 R1, R2 and R3 are selected from the group consisting of hydrogen and alkyl such that the sum of the total number of carbon atoms in R1, R2 and R3 is an average of from about 8 to 20, and (4) subjecting said scrubber sludge to secondary dewatering. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A flue gas desulfurization process comprising in sequence:
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(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 R1, R2 and R3 are selected from the group consisting of hydrogen and alkyl such that the sum of the total number of carbon atoms in R1, R2 and R3 is from about 8 to 20 and X is from about 1 to 10, and(4) subjecting said scrubber sludge to secondary dewatering. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A flue gas desulfurization process comprising in sequence:
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(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.
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Specification