FR2376685A1 - Removing nitrogen oxide(s) from waste combustion gas - by adding ammonia and then hydrogen, in two stage process - Google Patents

Removing nitrogen oxide(s) from waste combustion gas - by adding ammonia and then hydrogen, in two stage process

Info

Publication number
FR2376685A1
FR2376685A1 FR7700281A FR7700281A FR2376685A1 FR 2376685 A1 FR2376685 A1 FR 2376685A1 FR 7700281 A FR7700281 A FR 7700281A FR 7700281 A FR7700281 A FR 7700281A FR 2376685 A1 FR2376685 A1 FR 2376685A1
Authority
FR
France
Prior art keywords
pref
nox
stage process
degrees
hydrogen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7700281A
Other languages
French (fr)
Other versions
FR2376685B1 (en
Inventor
Sakae Koike
Shoichi Matsunami
Yorinobu Goto
Yoshio Tanabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Kasei Corp
Original Assignee
Mitsubishi Kasei Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Kasei Corp filed Critical Mitsubishi Kasei Corp
Priority to FR7700281A priority Critical patent/FR2376685A1/en
Publication of FR2376685A1 publication Critical patent/FR2376685A1/en
Application granted granted Critical
Publication of FR2376685B1 publication Critical patent/FR2376685B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides

Abstract

Waste combustion gases contg. NOx are treated in a two-stage process. The gas is mixed at 700-1300 degrees C with O2 and NH3 in the absence of H2, or in the presence of less than 10 moles H2 per mole NH3. The mole ratio H2:NH3 is adjusted to more than 3:1 and the gas mixt. is exposed to a temp. of 490-700 degrees C. The H2 is pref. obtd. by cracking NH3; and in stage (a), the gas mixt. pref. contains 0.1-10 vol.% O2 and 0.6-10 moles NH3 per mole of NOx. In stage (b), the temp. is pref. 550-680 degrees C and the mole ratio H2:NH3 is pref. above 5:1. Used for removing NOx from waste gases obtd. e.g. from boilers burning various fuel oils or coal; or from exhaust gas from integral combustion engines. The NOx causes environmental pollution and smog.
FR7700281A 1977-01-06 1977-01-06 Removing nitrogen oxide(s) from waste combustion gas - by adding ammonia and then hydrogen, in two stage process Granted FR2376685A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7700281A FR2376685A1 (en) 1977-01-06 1977-01-06 Removing nitrogen oxide(s) from waste combustion gas - by adding ammonia and then hydrogen, in two stage process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7700281A FR2376685A1 (en) 1977-01-06 1977-01-06 Removing nitrogen oxide(s) from waste combustion gas - by adding ammonia and then hydrogen, in two stage process

Publications (2)

Publication Number Publication Date
FR2376685A1 true FR2376685A1 (en) 1978-08-04
FR2376685B1 FR2376685B1 (en) 1982-05-07

Family

ID=9185196

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7700281A Granted FR2376685A1 (en) 1977-01-06 1977-01-06 Removing nitrogen oxide(s) from waste combustion gas - by adding ammonia and then hydrogen, in two stage process

Country Status (1)

Country Link
FR (1) FR2376685A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2510423A1 (en) * 1981-07-31 1983-02-04 Ppg Industries Inc PROCESS FOR MELTING GLASS WITH TWO-STEP CONTROL OF NOX FORMATION
EP0286268A2 (en) * 1987-04-08 1988-10-12 Energy And Environmental Research Corporation Method for preventing formation of ammonium bisulfate, sulfuric acid, and related products in combustion effluents

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2221173A1 (en) * 1973-03-16 1974-10-11 Exxon Research Engineering Co

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2221173A1 (en) * 1973-03-16 1974-10-11 Exxon Research Engineering Co

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2510423A1 (en) * 1981-07-31 1983-02-04 Ppg Industries Inc PROCESS FOR MELTING GLASS WITH TWO-STEP CONTROL OF NOX FORMATION
EP0286268A2 (en) * 1987-04-08 1988-10-12 Energy And Environmental Research Corporation Method for preventing formation of ammonium bisulfate, sulfuric acid, and related products in combustion effluents
EP0286268A3 (en) * 1987-04-08 1990-12-05 Energy & Environ Res Corp Methods for preventing formation of ammonium bisulfate, sulfuric acid, and related products in combustion effluents

Also Published As

Publication number Publication date
FR2376685B1 (en) 1982-05-07

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