Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1990-07-16
1992-02-04
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423244, C01B 1705
Patent
active
050858432
ABSTRACT:
A desulphurization process, in which acid components of waste gas are removed by spray drying absorption, using an aqueous suspension of slaked lime or limestone as absorbent with recycling of part of the reaction product to the absorbent, is controlled on the basis of determination of the chloride content of the aqueous suspension including recycled reaction product. The chloride content of the absorbent is used as the basis for (a) controlling the amount of chloride in the aqueous suspension to such a value that a specific chloride content of the spray dried product is between 1 and 7% by weight, and, within this range is related to the difference between the temperature of the desulphurized waste gas and the adiabatic saturation temperature thereof, and/or (b) for controlling the quantity of water evaporated by the spray drying, which is also related to the set forth chloride content, to change the difference between the temperature of the desulphurized waste gas and the adiabatic saturation temperature thereof, to provide a minimum temperature difference so as to maximize the acid base reaction yet maintain an actual temperature difference high enough to avoid sticky products.
REFERENCES:
patent: 3969482 (1976-07-01), Teller
patent: 4208383 (1980-06-01), Kisters et al.
patent: 4279873 (1981-07-01), Felsvang et al.
patent: 4600428 (1986-07-01), Yoon
patent: 4604269 (1986-08-01), Yoon
Perry's Chemical Engineering Handbook, 1984, 22-50, 22-51.
Felsvang Karsten S.
Rasmussen Bjarne
Rasmussen Stig
A/S Niro Atomizer
Straub Gary P.
Vanoy Timothy C.
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