Method of removing SO/sub 2/ and/or other acid components from waste gases

Patent · Tue Aug 02 04:00:00 EDT 1977

OSTI ID:6482966

Bechthold, H; Bottger, P

Waste gas is contacted with a solution of a salt from a pollutant of the gas. This solution is obtained from an-other stage of the process used for cleansing or purifying the gas. The resulting mixture of gas and solution is subjected to vaporization so as to obtain a dry gaseous substance constituted by the waste gas and the evaporated solvent for the salt. The gaseous substance thus formed contains crystals of the salt as well as the pollutant present in the original waste gas. The salt crystals and other solid particles are removed from the gaseous substance in the form of a dry solids mixture. The gaseous substance is subsequently mixed with an absorption fluid such as an ammonia solution in order to wash out and redissolve any salt crystals which may remain in the gaseous substance and in order to remove the pollutant present in the original waste gas from the gaseous substance. The pollutant and the redissolved salt crystals form a salt solution together with the absorption fluid and it is this salt solution which is brought into contact with the waste gas. The gaseous substance is exhausted to the atmosphere after being mixed with the absorption fluid.

• Assignee: Walther and Cie AG
• Patent Number(s): US 4039304
• OSTI ID: 6482966
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
424000* -- Engineering-- Pollution Control Equipment-- (1980-1989)
AIR POLLUTION CONTROL
AMMONIA
CHALCOGENIDES
CHEMICAL REACTIONS
CLEANING
DESIGN
DESULFURIZATION
EQUIPMENT
GASEOUS WASTES
HYDRIDES
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OPERATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
REMOVAL
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTES