Sulphur trioxide absorption apparatus and process

Patent · Tue Mar 31 04:00:00 EST 1987

OSTI ID:6596802

Cameron, G M

This patent describes a contact process for producing a concentrated sulphuric acid from dry sulphur dioxide and oxygen containing mixtures which employs the absorption of sulphur trioxide from a hot, dry gas stream containing sulphur trioxide into at least one sulphuric acid stream. The improvement described here comprises: (a) feeding the gas stream to a lower packed absorption zone contained within an absorption tower; (b) feeding a first sulphuric acid stream to the lower absorption zone to effect absorption of a major portion of the sulphur trioxide from the gas stream into the first sulphuric acid stream to produce a first enriched sulphuric acid stream and a depleted sulphur trioxide gas stream; (c) feeding the depleted sulphur trioxide gas stream to an upper packed absorption zone above the lower absorption zone within the tower; and (d) feeding a second sulphuric acid stream to the upper absorption zone to effect absorption of substantially all of the sulphur trioxide remaining in the depleted sulphur trioxide gas stream to produce a second enriched sulphuric acid stream and a substantially sulphur trioxide-free gas stream.

• Assignee: C-I-L, Inc., North York
• Patent Number(s): US 4654205
• OSTI ID: 6596802
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
AIR POLLUTION CONTROL
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
COOLING
DESULFURIZATION
DISPERSIONS
ELEMENTS
FLUE GAS
FLUID FLOW
GAS FLOW
GASEOUS WASTES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MIXTURES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PACKED BED
POLLUTION CONTROL
SEPARATION EQUIPMENT
SORPTION
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SULFUR TRIOXIDE
SULFURIC ACID
TEMPERATURE DEPENDENCE
WASTES