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US 4,804,521 AGranted
Process for removing sulfur from sulfur-containing gases
AssigneeBoard of Regents, The University of Texas System
InventorsGary T. Rochelle, Wojciech Jozewicz
Life of this patent
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Abstract
The present disclosure relates to improved processes for treating hot sulfur-containing flue gas to remove sulfur therefrom. Processes in accorda The government may own certain rights in the present invention pursuant to EPA Cooperative Agreement CR 81-1531.
Claims24
A process for reducing the level of sulfur, the sulfur being generally in the form of sulfur dioxide in a sulfur dioxide-containing gas, comprising the steps of:
- (a) preparing an aqueous slurry comprising a calcium alkali together with a calcium-reactive silica or alumina which are present in amounts sufficient to allow for the formation of a sulfur dioxide-absorbing component which includes a calcium silicate or calcium aluminate;
- (b) heating the slurry to a temperature between about 40.degree. and about 200.degree. C. to facilitate in the formation of the sulfur dioxide-absorbing component;
- (c) atomizing the slurry into a stream of the sulfur dioxide-containing gas;
- (d) drying the resulting atomized droplets so as to form a gas/solid suspension having a gaseous component and a solid component which includes the sulfur dioxide-absorbing component;
- (e) retaining the gaseous and solid components in contact in a manner sufficient to allow for the absorption of sulfur dioxide by the absorbing component;
- and
- (f) separating the absorbing component in the form of spent solids from the gas.
4 more elements
A process for reducing the level of sulfur, the sulfur being generally in the form of sulfur dioxide in a sulfur dioxide-containing gas, comprising the steps of:
- (a) preparing an aqueous slurry comprising a mass ratio of a calcuim-reactive silica or alumina to calcium alkali ranging from about 1:1 to about 16:1, respectively, with about 1 to about 3 moles of caloium alkali for every mole of sulfur to be removed from the gas;
- (b) heating the slurry to between about 40.degree. and 200.degree. C. for between about 0.5 and 48 hours;
- (c) atomizing the slurry into a stream of the sulfur dioxide-containing gas;
- (d) drying the resulting droplets so as to form a gas/solid suspension having a gaseous component and a solid component which includes a sulfur dioxide-adsorbing component;
- (e) retaining the gas/solid suspension in a stream to allow for th absorption of sulfur dioxide by the absorbing component;
- and
- (f) removing the sulfur dioxide from the gas by separating the solid component from the gaseous component.
4 more elements
Dependencies are inferred from the claim text.