Process for removing acid components from gas streams

Patent · Tue Mar 31 04:00:00 EST 1992

OSTI ID:5014822

Brna, T G; Sedman, C B; Chang, J C.S.; Jorgensen, C; Rochelle, G T

This patent describes a process for reducing the level of acid components, including one or more of SO{sub 2}, SO{sub 3}, HCL, HBr or HF, in a gas stream. It comprises: preparing a semi-dry, free-flowing powdery substance comprising a calcium silicate and having a water content of between about 5% and 50% by weight, the powdery substance being prepared by a process that includes preparing a mixture comprising a material containing calcium together with a material containing calcium-reactive silica, the calcium and silica being present in the mixture in amounts sufficient to allow for the formation of the calcium silicate, and heating the mixture to a temperature above ambient to facilitate in the formation of the calcium silicate; contacting the gas stream with the powdery substance at a temperature between about 5{degrees} and about 30{degrees}C above the saturation temperature of the gas in a manner sufficient to allow for absorption of one or more of the acid components by the calcium silicate; and separating the calcium silicate in the form of spent solids from the gas.

• Assignee: Board of Regents, Univ. of Texas System, Austin, TX (United States)
• Patent Number(s): US 5100643; A
• Application Number: PPN: US 7-163090
• OSTI ID: 5014822
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
400201 -- Chemical & Physicochemical Properties
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
BROMINE COMPOUNDS
CALCIUM COMPOUNDS
CATALYSTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHLORINE COMPOUNDS
CONTROL
FLUE GAS
FLUORINE COMPOUNDS
GASEOUS WASTES
HALOGEN COMPOUNDS
HYDROBROMIC ACID
HYDROCHLORIC ACID
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MANAGEMENT
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PROCESSING
PURIFICATION
REACTION KINETICS
SCRUBBING
SEPARATION PROCESSES
SILICATES
SILICON COMPOUNDS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES