Purification of coke oven gas with production of sulfuric acid and ammonium sulfate. [11 claims]

Patent · Tue Nov 23 04:00:00 EST 1976

OSTI ID:7329408

Cooper, F D

A continuous process is provided which has the primary purpose of removing NH/sub 3/, H/sub 2/S, HCN, and (CN)/sub 2/ from the subject gas mixtures and the secondary purpose of producing (NH/sub 4/)/sub 2/SO/sub 4/ and iron oxide for industrial uses. The gas mixture which contains tar and other condensible vapors, NH/sub 3/, H/sub 2/S, HCN, and (CN)/sub 2/ together with small volumes of gas from the ammonia still of the system, and gas from a system H/sub 2/SO/sub 4/ plant, is contacted in a single three-stage reaction chamber in the presence, if need be, of a tar solvent, additional NH/sub 3/, and the reagent Fe(OH)/sub 2/, which itself is a product of a concurrent reaction between NH/sub 3/ and FeSO/sub 4/. The unpurified gas mixture's condensible vapors are largely prevented from condensing by maintaining a steady, elevated temperature, while the mixture is essentially freed of HCN, (CN)/sub 2/, NH/sub 3/, and H/sub 2/S in the reactor before the gas mixture passes through a primary gas cooler. The gas then passes through a benzene, toluene, and xylene absorber before being pressurized and distributed. The spent reaction chamber reagent is separated to produce tar and solvent; (NH/sub 4/)/sub 2/SO/sub 4/, solution, and iron precipitates. Sulfur dioxide released by the iron oxide production process is used to produce H/sub 2/SO/sub 4/, which in turn is either reacted with scrap iron, or used in a metal pickling operation to produce FeSO/sub 4/ for use in preparation of thereaction chamber reagent. 11 claims, 1 figure.

• Assignee: TIC; EDB-77-059025; ERA-02-028259
• Patent Number(s): US 3993730
• OSTI ID: 7329408
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
010500 -- Coal
Lignite
& Peat-- Products & By-Products
AMMONIA
AMMONIUM COMPOUNDS
AMMONIUM SULFATES
CHALCOGENIDES
CHEMICAL REACTIONS
COAL GAS
COAL TAR
CYANOGEN
DESULFURIZATION
FLUIDS
GASES
HYDRIDES
HYDROCYANIC ACID
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INORGANIC ACIDS
IRON COMPOUNDS
IRON OXIDES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PRODUCTION
PURIFICATION
REMOVAL
SULFATES
SULFIDES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SULFURIC ACID
TAR
TRANSITION ELEMENT COMPOUNDS