Process for removing sulfur and NO/sub x/ components from a gas stream

Patent · Tue Oct 31 04:00:00 EST 1978

OSTI ID:6491416

Hass, R H

A feed gas containing one or more components selected from the class consisting of H/sub 2/S, SO/sub 2/, SO/sub 3/, COS, CS/sub 2/, light mercaptans, and sulfur vapor is desulfurized by (a) hydrogenating and hydrolyzing essentially all non-H/sub 2/S sulfur components to H/sub 2/S, (b) oxidizing most of the H/sub 2/S in the resulting product gas to sulfur, and removing the latter by condensation, (c) oxidizing the residual H/sub 2/S to SO/sub 2/, (d) absorbing essentially all the SO/sub 2/ in an aqueous ammonia solution, (e) passing a portion of the SO/sub 2/-containing ammonia solution to step (a), and (f) discharging from step (d) a purified product gas essentially free of sulfur components. A feed gas, such as a stack gas, which contains only SO/sub 2/ and SO/sub 3/ components to be removed therefrom, may be treated if alternative embodiments of the invention involving the passage of all or a major proportion of the feed gas directly to absorption step (d). In all embodiments of the invention a substantial proportion of NO/sub x/ components, if present in the feed gas, is also removed.

• Assignee: Union Oil Co. of California
• Patent Number(s): US 4123507
• OSTI ID: 6491416
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
AIR POLLUTION CONTROL
CHALCOGENIDES
CHEMICAL REACTIONS
CLAUS PROCESS
DENITRIFICATION
DESIGN
DESULFURIZATION
EQUIPMENT
FLUE GAS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
INDUSTRIAL PLANTS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
SULFUR COMPOUNDS
SULFUR OXIDES
THERMAL POWER PLANTS
WASTES