KR950701247A - PROCESS FOR THE CATALYTIC REDUCTION OF NITROGEN OXIEDS - Google Patents

PROCESS FOR THE CATALYTIC REDUCTION OF NITROGEN OXIEDS

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Publication number
KR950701247A
KR950701247A KR1019940703976A KR19940703976A KR950701247A KR 950701247 A KR950701247 A KR 950701247A KR 1019940703976 A KR1019940703976 A KR 1019940703976A KR 19940703976 A KR19940703976 A KR 19940703976A KR 950701247 A KR950701247 A KR 950701247A
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South Korea
Prior art keywords
urea
effluent
ammonia
hydrolyzate
nitrogen oxides
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KR1019940703976A
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Korean (ko)
Inventor
디. 피터-호블린 제레미
린다 린 엠.
에이치. 선 윌리엄
이. 호프만 죤
Original Assignee
제임스 알 카르티글리아
날코 퓨얼 테크(Nalco Fuel Tech)
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Application filed by 제임스 알 카르티글리아, 날코 퓨얼 테크(Nalco Fuel Tech) filed Critical 제임스 알 카르티글리아
Publication of KR950701247A publication Critical patent/KR950701247A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8621Removing nitrogen compounds
    • B01D53/8625Nitrogen oxides

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)
  • Catalysts (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

본 발명은 연료유출물중의 질소산화물의 촉매적 환원방법에 관한 것이다. 진보적인 이 방법은 우레아 가수분해물이 형성되기에 효과적인 조건하에서 우레아를 처리하는 단계; 우레아 가수분해물을 암모니아가 형성되고 암모니아-함유 유출물이 생성되기에 효과적인 조건하에서 유출물(50)에 도입시키는 단계; 그리고 암모니아의 존재하에 질소산화물을 환원시키기에 효과적인 촉매를 포함하는 촉매작용 영역(30)을 통해서 암모니아-함유 유출물을 통과시킴으로써 유출물중의 질소 산화물을 촉매적으로 환원시키는 단계로 이루어진다.The present invention relates to a catalytic reduction method of nitrogen oxides in fuel effluents. This progressive process comprises treating urea under conditions effective to form urea hydrolyzate; Introducing the urea hydrolyzate into the effluent 50 under conditions effective to form ammonia and produce an ammonia-containing effluent; And catalytically reducing the nitrogen oxides in the effluent by passing the ammonia-containing effluent through a catalysis zone 30 comprising a catalyst effective for reducing the nitrogen oxides in the presence of ammonia.

Description

질소 산화물의 촉매적 환원 방법(PROCESS FOR THE CATALYTIC REDUCTION OF NITROGEN OXIEDS)PROCESS FOR THE CATALYTIC REDUCTION OF NITROGEN OXIEDS

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

본 도면은 본 발명의 방법을 이용하는 보일러의 개략도이다.This figure is a schematic diagram of a boiler using the method of the present invention.

Claims (20)

a) 우레아 가수분해물을 형성시키기에 효??거인 조건하에서 우레아를 처리하는단계; b)상기 우레아 가수분해물을, 암모니아가 형성되고 암모니아 함유 유출물이 생성되기에 효과적인 조건하에서 유출물에 도입시키는 단계; 그리고 c)암모니아-함유 유출물을 암모니앙의 존재하에, 질소산화물을 환원시키기에 효과적인 촉매를 포함한 촉매 작용 영역을 통해 통과시킴으로써 유출물중의 질소산화물을 촉매적으로 환원시키는 단계로 이루어지는, 연소유출물중의 질소 산화물을 촉매적으로 환원시키기 위한 방법.a) treating urea under conditions effective to form urea hydrolyzate; b) introducing the urea hydrolyzate into the effluent under conditions effective to form ammonia and produce an ammonia containing effluent; And c) catalytically reducing the nitrogen oxides in the effluent by passing the ammonia-containing effluent in the presence of ammonia, through a catalytic zone containing a catalyst effective to reduce the nitrogen oxides. A method for catalytically reducing nitrogen oxides in water. 제1항에 있어서, 상기 우레아 가수분해물은, 우레아수용액을, 상기 우레아가 최소한 부분적으로 가수분해되어 카르밤산 암모늄의 중탄산 암모늄/탄산 암모늄과의 착체를 포함하는 가수분해물이 형성되기에 충분한 시간동안 열 및 압력에 노출시킴으로써 형성되고, 카르밤산암모늄 대 중탄산암모늄/탄산 암모늄의 비는 약 10:1 내지 약 1:20인 것을 특징으로 하는 방법.2. The urea hydrolyzate of claim 1, wherein the urea hydrolyzate is heated for a time sufficient to cause the urea solution to form a hydrolyzate comprising at least partially hydrolysis of the urea to form a complex of ammonium bicarbonate / ammonium bicarbonate / ammonium carbamate. And formed by exposure to pressure, wherein the ratio of ammonium carbamate to ammonium bicarbonate / ammonium carbonate is from about 10: 1 to about 1:20. 제2항에 있어서, 상기 압력이 최소한 약 500psi 인 것을 특징으로 하는 방법.The method of claim 2, wherein the pressure is at least about 500 psi. 제3항에 있어서, 상기 우레아 수용액이 상기 우레아를 최소한 부분적으로 가수분해되도록 하기 위해 3 내지 14분 동안 최소한 300℉(149℃)로 가열되는 것을 특징으로 하는 방법.The method of claim 3, wherein the aqueous urea solution is heated to at least 300 ° F. (149 ° C.) for 3 to 14 minutes to cause the urea to be at least partially hydrolyzed. 제4항에 있어서, 상기 우레아 수용액이 제자리에서 가수분해되는 것을 특징으로 하는 방법.The method of claim 4 wherein the aqueous urea solution is hydrolyzed in place. 제5항에 있어서, 상기 우레아 수용액이 라인내(in-line) 가수분해되는 것을 특징으로 하는 방법.The method of claim 5 wherein the aqueous urea solution is hydrolyzed in-line. 제2항에 있어서, 우레아용액이 우레아의 가수분해를 위한 촉매의 접촉되는 것을 특징으로 하는 방법.The method of claim 2 wherein the urea solution is contacted with a catalyst for hydrolysis of urea. 제7항에 있어서, 상기 우레아 가수분해 촉매가 금속, 금속산화물, 금속염, 및 이것들이 혼합물로 이루어지는 군으로부터 선택되는 것을 특징으로 하는 방법.8. The method of claim 7, wherein said urea hydrolysis catalyst is selected from the group consisting of metals, metal oxides, metal salts, and mixtures thereof. 제1항에 있어서, 상기 우레아 가수분햄이 550℉와 950℉ 사이(288℃와 510℃)사이의 유출물 온도에서 유출물안에 도입되는 것을 특징으로 하는 방법.The method of claim 1 wherein the urea hydrolyzate is introduced into the effluent at an effluent temperature between 550 ° F. and 950 ° F. (288 ° C. and 510 ° C.). 제1항에 있어서, 상기 우레아 가수분해물이 약 1:10 내지 5:1의 암모니아 대 질소산화물의 몰비를 제공하기에 충분한 양으로 유출물에 도입되는 것을 특징으로 하는 방법.The method of claim 1 wherein the urea hydrolyzate is introduced to the effluent in an amount sufficient to provide a molar ratio of ammonia to nitrogen oxides of about 1:10 to 5: 1. 제1항에 있어서, 암모니아-함유 유출물이 상기 촉매 영역을 통과할때 유출물의 온도가 230℉ 내지 950℉(110℃ 내지 510℃)인 것을 특징으로 하는 방법.The process of claim 1 wherein the temperature of the effluent is from 230 ° F. to 950 ° F. (110 ° C. to 510 ° C.) as the ammonia-containing effluent passes through the catalyst zone. a)암모니아-함유 유출물을 생성하기 위해 도입시점에서 유출물이 존재하는 조건하에서 암모니아를 생성하는 화합물을 유출물에 도입시키는 단계; 그리고 b)암모니아-함유 유출물을 암모니아의 존재하에 질소산화물을 환원시키기에 효과적인 촉매를 포함한 촉매 작용 영역을 통해 통과시킴으로써 유출물중의 질소산화물을 촉매적으로 환원시키는 단계로 이루어지는, 연소유출물 중의 질소산화물을 촉매적으로 환원시키기 위한 방법.a) introducing into the effluent a compound that produces ammonia under conditions in which the effluent is present at the point of introduction to produce an ammonia-containing effluent; And b) catalytically reducing the nitrogen oxides in the effluent by passing the ammonia-containing effluent through a catalytic action zone including a catalyst effective to reduce the nitrogen oxides in the presence of ammonia. A method for catalytically reducing nitrogen oxides. 제12항에 있어서, 암모니아를 생성하는 화합물이 우레아 또는우레아 가수분해물을 포함하는 것을 특징으로 하는 방법.13. The method of claim 12, wherein the compound producing ammonia comprises urea or urea hydrolyzate. 제13항에 있어서, 상기 우레아 가수분해물은, 우레아수용액을, 상기 우레아가 최소한 부분적으로 가수분해되어 카르빔산 암모늄의 중탄산 암모늄/탄산 암모늄과의 착체를 포함하는 가수분해물이 형성되기에 충분한 시간동안 열 및 압력에 노출시킴으로써 형성되고, 카르빔산암모늄 대 중탄산암모늄/탄산 암모늄의 비는 약 10:1 내지 약 1:20인 것을 특징으로 하는 방법.14. The urea hydrolyzate of claim 13 wherein the urea hydrolyzate is heated for a time sufficient to cause the urea solution to form a hydrolyzate comprising at least partially hydrolysis of the urea to form a complex of ammonium carbate with ammonium bicarbonate / ammonium carbonate. And formed by exposure to pressure, wherein the ratio of ammonium carbate to ammonium bicarbonate / ammonium carbonate is from about 10: 1 to about 1:20. 제14항에 있어서, 상기 우레아 용액이 3 내지 15분 동안 최소한 300℉(149℃)의 온도로 가열되는 것을 특징으로 하는 방법.The method of claim 14, wherein the urea solution is heated to a temperature of at least 300 ° F. (149 ° C.) for 3 to 15 minutes. 제15항에 있어서, 우레아 용액이 최소한 약 500psi 의 압력하에 놓이는 것을 특징으로 하는 방법.The method of claim 15, wherein the urea solution is at a pressure of at least about 500 psi. 제14항에 있어서, 우레아 용액이 우레아의 가수분해를 위한 촉매와 접촉되는 것을 특징으로 하는 방법.The method of claim 14, wherein the urea solution is contacted with a catalyst for hydrolysis of urea. 제17항에 있어서, 상기 우레아 가수분해 촉매가 금속, 금속산화물, 금속염 및 이것들의 혼합물로 이루어지는 군으로부터 선택되는 것을 특징으로 하는 방법.18. The process according to claim 17, wherein the urea hydrolysis catalyst is selected from the group consisting of metals, metal oxides, metal salts and mixtures thereof. 제14항에 있어서, 상기 우레아 가수분해물이 550℉와 950℉(288℃와 510℃)사이의 유출물 온도에서 유출물안에 도입되는 것을 특징으로 하는 방법.The method of claim 14 wherein the urea hydrolyzate is introduced into the effluent at an effluent temperature between 550 ° F. and 950 ° F. (288 ° C. and 510 ° C.). 제13항에 있어서, 상기 우레아 가수분해물이 약 1:10 내지 5:1의 암모니아 대 질소산화물의 몰비를 제공하기에 충분한 양으로 유출물에 도입되는 것을 특징으로 하는 방법.The method of claim 13, wherein the urea hydrolyzate is introduced to the effluent in an amount sufficient to provide a molar ratio of ammonia to nitrogen oxides of about 1:10 to 5: 1. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940703976A 1992-05-06 1993-04-28 PROCESS FOR THE CATALYTIC REDUCTION OF NITROGEN OXIEDS KR950701247A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US87943992A 1992-05-06 1992-05-06
US7/879,439 1992-05-06
PCT/US1993/003976 WO1993022047A1 (en) 1992-05-06 1993-04-28 Process for the catalytic reduction of nitrogen oxides

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KR950701247A true KR950701247A (en) 1995-03-23

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EP (1) EP0639109A4 (en)
KR (1) KR950701247A (en)
AU (1) AU4220593A (en)
CA (1) CA2135195A1 (en)
TW (1) TW229225B (en)
WO (1) WO1993022047A1 (en)

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DE19606135C2 (en) * 1996-02-20 1999-01-14 Erc Emissions Reduzierungs Con Catalyst arrangement, in particular for a three-pass boiler
CN101778798A (en) * 2007-08-24 2010-07-14 鲍尔斯潘公司 Method and apparatus for producing ammonium carbonate from urea
WO2012104205A1 (en) * 2011-02-04 2012-08-09 Paul Scherrer Institut Ammonia generator converting liquid ammonia precursor solutions to gaseous ammonia for denox-applications using selective catalytic reduction of nitrogen oxides
TWI464121B (en) * 2012-10-05 2014-12-11 Hsueh Yuan Lee Ammonia-containing fluid processing method and device thereof

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US4087513A (en) * 1977-08-12 1978-05-02 Olin Corporation Method of hydrolyzing urea contained in waste water streams
US4168299A (en) * 1978-03-20 1979-09-18 Olin Corporation Catalytic method for hydrolyzing urea
JPH02191528A (en) * 1989-01-20 1990-07-27 Babcock Hitachi Kk Denitrification device with solid reducing agent utilized therefor
US5139754A (en) * 1989-09-12 1992-08-18 Fuel Tech, Inc. Catalytic/non-catalytic combination process for nitrogen oxides reduction
US5240688A (en) * 1990-08-01 1993-08-31 Fuel Tech Gmbh Process for the in-line hydrolysis of urea
DE4038054A1 (en) * 1990-11-29 1992-06-04 Man Technologie Gmbh METHOD AND DEVICE FOR SELECTIVE CATALYTIC NO (DOWN ARROW) X (DOWN ARROW) REDUCTION IN OXYGEN-BASED EXHAUST GASES

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CA2135195A1 (en) 1993-11-11
EP0639109A1 (en) 1995-02-22
TW229225B (en) 1994-09-01
WO1993022047A1 (en) 1993-11-11
AU4220593A (en) 1993-11-29
EP0639109A4 (en) 1995-03-22

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