UST909017I4 - Sulfur dioxide removal prom stack gases - Google Patents

Sulfur dioxide removal prom stack gases Download PDF

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Publication number
UST909017I4
UST909017I4 US909017DH UST909017I4 US T909017 I4 UST909017 I4 US T909017I4 US 909017D H US909017D H US 909017DH US T909017 I4 UST909017 I4 US T909017I4
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United States
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ammonium
ammonium sulfate
absorber
release
solution
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/48—Sulfur dioxide; Sulfurous acid
    • C01B17/50—Preparation of sulfur dioxide
    • C01B17/60—Isolation of sulfur dioxide from gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound

Definitions

  • Sulfur oxides can be removed from waste gases by ab sorption in ammoniacal solution forming ammonium bisulfite, ammonium sulfite, and, unavoidably, ammonium sulfate.
  • the absorber effiucnt solution may be treated with ammonium bisulfatc to form ammonium sulfate and to release a concentrated stream of S0 suitable for conversion to H 80 or elemental sulfur.
  • Ammonium sulfate may be crystallized from the solution and thermally decomposed to ammonia for recycle to the absorber and ammonium bisulfate for recycle to the S0 release step.
  • the economics of the process are improved by operating the absorber with an ammoniacal solution having a high content of ammonium sulfate; subsequent treatment of the scrubber efiluent with ammonium bisulfate and, after S0 release, with ammonia causes precipitation of ammonium sulfate without evaporation of the large amounts of water required in earlier concepts of this process.

Abstract

SULFUR OXIDES CAN BE REMOVED FROM WASTE GASES BY ABSORPTION IN AMMONIACAL SOLUTION FORMING AMMONIUM BISULFITE, AMMONIUM SULFITE, AND, UNAVOIDABLY, AMMONIUM SULFATE. THE ABSORBER EFFLUENT SOLUTION MAY BE TREATED WITH AMMONIUM BISULFATE TO FORM AMMONIUM SULFATE AND TO RELEASE A CONCENTRATION STREAM OF SO2 SUITABLE FOR CONVERSION TO H2SO4 OR ELEMENTAL SULFUR. AMMONIUM SULFATE MAY BE CRYSTALLIZED FROM THE SOLUTION AND THERMALLY DECOMPOSED TO AMMONIA FOR RECYCLE TO THE ABSORBER AND AMMONIUM BISULFATE FOR RECYCLE TO THE SO2 RELEASE STEP. THE ECONOMICS OF THE PROCESS ARE IMPROVED BY OPERATING THE ABSORBER WITH AN AMMONIACAL SOLUTION HAVING A HIGH CONTENT OF AMMONIUM SULFATE, SUBSEQUENT TREATMENT OF THE SCRUBBER EFFLUENT WITH AMMONIUM BISULFATE AND, AFTER SO2 RELEASE, WITH AMMONIA CAUSES PRECIPITATION OF AMMONIUM SULFATE WITHOUT EVAPORATION OF THE LARGE AMOUNTS OF WATER REQUIRED IN EARLIER CONCEPTS OF THIS PROCESS

Description

UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 GB. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.
Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Oflice makes no assertion as to the novelty of the disclosed subject matter.
PUBLISHED APRIL 17, 1973 T909,017 SULFUR DIOXIDE REMOVAL FROM STACK GASES John E. Jordan, 1306 30th St., Sheffield, Ala. 35660,
and George M. Newcombe, 200 Seven Oaks Road,
Apt. 8G, Durham, N.C. 27704 Filed Apr. 13, 1972, Ser. No. 243,636 Int. Cl. C01b 17/00 US. Cl. 423-442 3 Sheets Drawing. 18 Pages Specification Sulfur oxides can be removed from waste gases by ab sorption in ammoniacal solution forming ammonium bisulfite, ammonium sulfite, and, unavoidably, ammonium sulfate. The absorber effiucnt solution may be treated with ammonium bisulfatc to form ammonium sulfate and to release a concentrated stream of S0 suitable for conversion to H 80 or elemental sulfur. Ammonium sulfate may be crystallized from the solution and thermally decomposed to ammonia for recycle to the absorber and ammonium bisulfate for recycle to the S0 release step. The economics of the process are improved by operating the absorber with an ammoniacal solution having a high content of ammonium sulfate; subsequent treatment of the scrubber efiluent with ammonium bisulfate and, after S0 release, with ammonia causes precipitation of ammonium sulfate without evaporation of the large amounts of water required in earlier concepts of this process.
P 17, J. E. JORDON ET AL SULFUR DIOXIDE RFMOVAI; FROM STACK GASES Filed April 13, 1972 m 2 6m mo Emfiw 2 MW mwmmpmom 2 6w 2 K 3 w o SI & $92525 22 $3
US909017D 1972-04-13 1972-04-13 Sulfur dioxide removal prom stack gases Pending UST909017I4 (en)

Applications Claiming Priority (1)

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US24363672A 1972-04-13 1972-04-13

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UST909017I4 true UST909017I4 (en) 1973-04-17

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US909017D Pending UST909017I4 (en) 1972-04-13 1972-04-13 Sulfur dioxide removal prom stack gases

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322392A (en) 1979-03-30 1982-03-30 Research-Cottrell, Inc. SO2 Scrubbing system for flue gas desulfurization
US4690807A (en) 1985-08-15 1987-09-01 General Electric Environmental Services, Inc. Process for the simultaneous absorption of sulfur oxides and production of ammonium sulfate
US5362458A (en) * 1993-03-22 1994-11-08 General Electric Environmental Services, Incorporated Process for the simultaneous absorption of sulfur oxides and production of ammonium sulfate
US5658540A (en) * 1991-02-06 1997-08-19 Valentino; Joseph V. High-tech computerized containment and treatment apparatus and process for combustion off-gas

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322392A (en) 1979-03-30 1982-03-30 Research-Cottrell, Inc. SO2 Scrubbing system for flue gas desulfurization
US4690807A (en) 1985-08-15 1987-09-01 General Electric Environmental Services, Inc. Process for the simultaneous absorption of sulfur oxides and production of ammonium sulfate
US5658540A (en) * 1991-02-06 1997-08-19 Valentino; Joseph V. High-tech computerized containment and treatment apparatus and process for combustion off-gas
US5362458A (en) * 1993-03-22 1994-11-08 General Electric Environmental Services, Incorporated Process for the simultaneous absorption of sulfur oxides and production of ammonium sulfate

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