Process and composition for H sub 2 S removal

Patent · Tue Oct 03 04:00:00 EDT 1989

OSTI ID:7261007

Olson, D C; Miller, J J; Miller, W R; Blytas, G C; Diaz, Z

This patent describes a process for the removal of H{sub 2}S from and H{sub 2}S-containing gaseous stream. It comprises contacting the H{sub 2}S-containing gaseous stream with aqueous reactant solution in a contacting zone, at a temperature below the melting point of sulfur. The reactant solution containing ammonium ferric nitrilotriacetate chelate and ammonium ferrous nitrilotriacetate chelate. The ratio of the ammonium ferric nitrilotriacetate chelate to ammonium ferrous nitrilotriacetate chelate in the reactant solution being from about 0.2 to about 6, at least about 0.1 percent, molar basis, with respect to the ammonium ferric and ammonium ferrous nitrilotriacetate chelates, of aqueous ammonia, an amount of thiosulfate ion sufficient to inhibit ligand degradation, a total iron content of from about 0.5 percent to about 7 percent by weight, the weight of the solution and iron, and a total concentration of sodium and potassium ions present in the reactant solution less than that sufficient to precipitate sodium and potassium ferrous nitrilotriacetate cheltate under conditions to convert H{sub 2}S.

• Assignee: Shell Oil Co., Houston, TX
• Patent Number(s): US 4871520
• OSTI ID: 7261007
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020800* -- Petroleum-- Waste Management
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION CONTROL
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DESULFURIZATION
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INDUSTRIAL PLANTS
PETROLEUM REFINERIES
POLLUTION CONTROL
REMOVAL
SULFIDES
SULFUR COMPOUNDS
WASTES