Process for removal of sulfur dioxide from gaseous mixtures

Patent · Tue Jul 08 04:00:00 EDT 1980

OSTI ID:5038444

Tung, S

A process for removing sulfur dixoide from a gaseous mixture comprises: contacting the gaseous mixture in a scrubbing zone with a removal rectant consisting essentially of an aqueous solution of a first salt of an alkali metal to form an aqueous solution of alkali metal hydrosulfite salt, said first salt being derived from a weak acid having a pKa value which is at least 3.5; contacting, in a transfer reaction zone, the aqueous solution of said alkali metal hydrosulfite salt with a transfer reactant consisting of an organic phase which does not form a stable emulsion with water, and includes at least one aliphatic amine salt containing from about 8 to about 45 carbon atoms, and having a solubility in water of less than about 5 gms of the amine salt per 100 gms of water at 25/sup 0/ and having a transfer capability, g, which is greater than 0.15, said amine salt being derived from the reaction of an amine with a weak acid having a pKa value which is at least 3.5, to yield an organic liquid phase containing, by a transfer reaction, at least one sulfur-containing amine salt, and an aqueous solution phase containing a second alkali metal salt differing from said first alkali metal salt and rectable with free amine derived from said sulfurcontaining amine salt to yield said first alkali metal salt; heating the organic liquid phase to decompose the sulfurcontaining amine salt to yield sulfur dioxide and a free amine; then contacting at least a portion of said free amine with at least a portion of said second akali metal salt to reconstitute said amine salt and concurrently reconstitute said first alkali metal salt.

• Assignee: IFI; ERA-06-000126; EDB-80-121090
• Patent Number(s): US 4211761
• OSTI ID: 5038444
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
ALKALI METAL COMPOUNDS
AMINES
CHALCOGENIDES
CHEMICAL REACTIONS
DESULFURIZATION
DIRECT REACTIONS
FLUIDS
GASES
ION EXCHANGE
NUCLEAR REACTIONS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RECYCLING
REMOVAL
SCRUBBING
SOLUBILITY
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TRANSFER REACTIONS