CN1903415A - Catalytic oxidation process for treating tail gas from absorption tower of acrylonitrile installation - Google Patents

Catalytic oxidation process for treating tail gas from absorption tower of acrylonitrile installation Download PDF

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Publication number
CN1903415A
CN1903415A CNA2005100281805A CN200510028180A CN1903415A CN 1903415 A CN1903415 A CN 1903415A CN A2005100281805 A CNA2005100281805 A CN A2005100281805A CN 200510028180 A CN200510028180 A CN 200510028180A CN 1903415 A CN1903415 A CN 1903415A
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China
Prior art keywords
tail gas
absorption tower
catalytic oxidation
treating
reactor
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CN100417433C (en
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赵小平
吴利军
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DONGHUA ENVIRONMENT ENGINEERING Co Ltd SHANGHAI
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DONGHUA ENVIRONMENT ENGINEERING Co Ltd SHANGHAI
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals

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  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

A process for treating the acrylonitrile contained waste gas exhausted by the acrylonitrile apparatus includes such steps as mixing said waste gas with air, heating, catalytic oxidizing reaction to decompose the harmful volatile organic substance to CO2 and H2O, recovering heat and exhausting.

Description

The catalytic oxidation process for treating of tail gas from absorption tower of acrylonitrile installation
Technical field
The present invention relates to a kind of in industrial production acrylonitrile process the catalytic oxidation process for treating of tail gas from absorption tower.
Background technology
Adopting the acrylonitrile installation of ammoxidation of propylene technology, is primary raw material with propylene, ammonia, air, and under the effect of catalyst, reaction generates acrylonitrile and other byproduct, through over-quenching, recovery, technical process such as refining, obtains the acrylonitrile product afterwards.In the acrylonitrile process process, discharge one gas, be referred to as tail gas from absorption tower (AOG) from the absorption tower cat head.The main component of this tail gas is nitrogen, water vapour and carbon dioxide, contains contaminated environment harmful components such as a certain amount of carbon monoxide, acrylonitrile, propylene and propane simultaneously.Because organic concentration is low in the tail gas from absorption tower of acrylonitrile installation, toxicity is high, adopts general tail gas treatment process can not satisfy environmental requirement,
Tail gas from absorption tower of acrylonitrile installation generally adopts the directly discharging of the high point of chimney at present, and environment is caused severe contamination.
Also have part propylene nitrile device to adopt the heating power burning method to carry out the acrylonitrile vent gas treatment in addition, but the shortcoming of heating power burning method is to need to consume a large amount of fuel, operating cost is higher, and the burning capacity is bigger, has micro-NO in the burning process xProduce.
Summary of the invention
Above-mentioned deficiency at direct discharging and employing heating power burning method, technical problem to be solved by this invention is to propose that a kind of technology is simple, SR is little, need not booster fan, need not add auxiliary fuel, and operating cost is low, the catalytic oxidation process for treating of the tail gas from absorption tower of acrylonitrile installation of non-secondary pollution, thorough tail gas treatment.
In order to solve the problems of the technologies described above, the catalytic oxidation process for treating of a kind of tail gas from absorption tower of acrylonitrile installation that the present invention proposes, after its innovative point is tail gas from absorption tower and air Hybrid Heating, with noble metal platinum, palladium honeycomb metallic catalyst or ceramic honeycomb catalyst as catalyst, at pressure 0～15kPa, temperature is to carry out catalytic oxidation in 100～720 ℃ the catalytic reactor, and harmful volatile organic matter is converted into carbon dioxide and water.
The inlet temperature of the above-mentioned catalytic reactor of the present invention preferentially is controlled at 100～350 ℃, is preferably in 300 ℃; Outlet temperature preferentially is controlled at 350～750 ℃, is preferably in below 720 ℃.In addition, the adding of the above-mentioned air of the present invention must be satisfied oxygen surplus 0.1～3.0% in the reaction discharging gas.
As the preferred technical solution of the present invention, tail gas from absorption tower of the present invention preferably enters catalytic reactor with after air or oxygen mixes after heater exhaust gas is heated to the catalyst initiation temperature.Heater exhaust gas is preferably welded plate type heat exchanger or heat exchange of heat pipe or finned tube exchanger.
As another optimal technical scheme of the present invention, after tail gas from absorption tower and air or oxygen carry out catalytic oxidation, preferably enter and enter atmosphere after heater exhaust gas reclaims heat.
As catalytic oxidation mechanism of the present invention, following chemical reaction has mainly taken place in the catalytic reactor:
With respect to prior art, technology of the present invention is simple, and volatile organic matter harmful in the tail gas from absorption tower of acrylonitrile installation is converted into carbon dioxide and water, non-secondary pollution, thorough tail gas treatment, testing result satisfy the environment protection control requirements of national Specification fully; In addition, the present invention has very broad opereating specification, in the time of can guaranteeing that content of organics changes in the acrylonitrile tail gas, and system's energy stable operation; Have, the present invention adopts large-sized catalyst again, and mechanical strength height, long service life, resistance reduce, need not booster fan; At last, the present invention adopts high-efficiency heat pipe heat exchanger, welded plate type heat exchanger and finned tube exchanger to reclaim reaction heat to add hot feed tail gas, need not additional fuel in the normal course of operation.
Description of drawings
Fig. 1 is the process chart of the catalytic oxidation process for treating of tail gas from absorption tower of acrylonitrile installation of the present invention.
Fig. 2 is the structural representation of the used catalytic reactor of technology of the present invention for Fig. 2.
Wherein:
1 is electric heater or steam heater; 2 is catalytic reactor; 3 is heater exhaust gas; 4 is reactor inlet side door valve; 5 is heater exhaust gas side door valve.
11,12 is manhole; 13 is the gas access; 14 is gas vent; 15 is catalyst fixed bed layer.
The specific embodiment
Below in conjunction with drawings and Examples technology of the present invention is further elaborated.
As illustrated in fig. 1 and 2, the catalytic oxidation process for treating of a kind of tail gas from absorption tower of acrylonitrile installation that first embodiment of the invention provides, tail gas from absorption tower adopt certain company's acrylonitrile plant tail gas from absorption tower of acrylonitrile installation, and working condition is as shown in table 1.
Go into operation be heated to the catalyst initiation temperature through electric heater or steam heater 1 after stage fuel gas and air mix after, enter catalytic reactor 2 and carry out catalytic oxidation.Gradually tail gas from absorption tower is switched and enter catalytic reactor 2, fuel switched catalytic reactor 2, ceramic honeycomb catalyst is fixed on the catalyst fixed bed layer 15, keep catalytic reactor 2 internal pressures to be about 7.5kPa, temperature is about 400 ℃, above-mentioned tail gas from absorption tower and air or oxygen carry out catalytic oxidation in catalytic reactor 2, harmful volatile organic matter is converted into carbon dioxide and water, and discharge a large amount of heat, after entering heater exhaust gas 3 recovery heats, gas vent 14 enters the atmosphere.After testing, the volatile organic content that sulfur dioxide, nitrogen oxide and NMHC etc. are harmful in the cleaning of off-gas is as shown in table 2.
Certain company's acrylonitrile plant tail gas from absorption tower of acrylonitrile installation of table 1 is formed
Component Flow (kg/h) Quality (%)
C 3H 8 169 0.205
C 3H 6 186 0.225
C 3H 3N 3 0.004
CO 874 1.059
CO 2 3246 3.932
H 2O 2976 3.605
O 2 821 0.995
N 2 74270 89.975
The waste gas total amount 82545 100.00
EGT ℃ 45
Exhaust gas pressure KPa (G) 10.0
Certain economizes environmental monitoring central station Monitoring Data and control index table 2..
Annotate: concentration of emission is repeatedly the mean value of sampling
The pollutant title Concentration of emission Concentration of emission evaluation criterion (mg/m 3)
Sulfur dioxide 76.7 550
Nitrogen oxide 238.7 240
NMHC 102 120
The second embodiment of the present invention, the inlet temperature of catalytic reactor are about 100 ℃, adopt the honeycomb platinum metal catalyst, and catalytic reactor 2 internal pressures are about 5kPa, the catalytic reactor outlet temperature is about 350 ℃; All the other are with embodiment 1.After testing, the volatile organic content that sulfur dioxide, nitrogen oxide and NMHC etc. are harmful in the cleaning of off-gas is as shown in table 2.
The third embodiment of the present invention, the inlet temperature of catalytic reactor are about 200 ℃, adopt the ceramic honey comb noble metal catalyst, and catalytic reactor 2 internal pressures are about 4kPa, the catalytic reactor outlet temperature is about 500 ℃; All the other are with embodiment 1.After testing, the volatile organic content that sulfur dioxide, nitrogen oxide and NMHC etc. are harmful in the cleaning of off-gas is as shown in table 2.
The fourth embodiment of the present invention, the inlet temperature of catalytic reactor are about 300 ℃, adopt the honeycomb platinum metal catalyst, and catalytic reactor 2 internal pressures are about 5.5kPa, the catalytic reactor outlet temperature is about 550 ℃; All the other are with embodiment 1.After testing, the volatile organic content that sulfur dioxide, nitrogen oxide and NMHC etc. are harmful in the cleaning of off-gas is as shown in table 2.
The fifth embodiment of the present invention, the inlet temperature of catalytic reactor are about 150 ℃, adopt the honeycomb palladium metal catalyst, and catalytic reactor 2 internal pressures are about 8kPa, the catalytic reactor outlet temperature is about 500 ℃; All the other are with embodiment 1.After testing, the volatile organic content that sulfur dioxide, nitrogen oxide and NMHC etc. are harmful in the cleaning of off-gas is as shown in table 2.
The sixth embodiment of the present invention, the inlet temperature of catalytic reactor are about 200 ℃, adopt the honeycomb platinum metal catalyst, and catalytic reactor 2 internal pressures are about 6kPa, the catalytic reactor outlet temperature is about 500 ℃; All the other are with embodiment 1.After testing, the volatile organic content that sulfur dioxide, nitrogen oxide and NMHC etc. are harmful in the cleaning of off-gas is as shown in table 2.
The seventh embodiment of the present invention, the inlet temperature of catalytic reactor are about 350 ℃, adopt the honeycomb palladium metal catalyst, and catalytic reactor 2 internal pressures are about 5kPa, the catalytic reactor outlet temperature is about 650 ℃; All the other are with embodiment 1.After testing, the volatile organic content that sulfur dioxide, nitrogen oxide and NMHC etc. are harmful in the cleaning of off-gas is as shown in table 2.
The eighth embodiment of the present invention, the inlet temperature of catalytic reactor are about 150 ℃, adopt the honeycomb platinum metal catalyst, and catalytic reactor 2 internal pressures are about 7kPa, the catalytic reactor outlet temperature is about 450 ℃; All the other are with embodiment 1.After testing, the volatile organic content that sulfur dioxide, nitrogen oxide and NMHC etc. are harmful in the cleaning of off-gas is as shown in table 2.
The ninth embodiment of the present invention, the inlet temperature of catalytic reactor are about 300 ℃, adopt the honeycomb palladium metal catalyst, and catalytic reactor 2 internal pressures are about 6kPa, the catalytic reactor outlet temperature is about 600 ℃; All the other are with embodiment 1.After testing, the volatile organic content that sulfur dioxide, nitrogen oxide and NMHC etc. are harmful in the cleaning of off-gas is as shown in table 2.
The tenth embodiment of the present invention, the inlet temperature of catalytic reactor are about 350 ℃, adopt ceramic honeycomb catalyst, and catalytic reactor 2 internal pressures are about 5kPa, the catalytic reactor outlet temperature is about 650 ℃; All the other are with embodiment 1.After testing, the volatile organic content that sulfur dioxide, nitrogen oxide and NMHC etc. are harmful in the cleaning of off-gas is as shown in table 2.
Certain company's acrylonitrile plant acrylonitrile emission-control equipment built up and to come into operation on April 5th, 2005, on April 9th～10,2005, be subjected to the trust of China Environmental Monitoring General Station, certain economizes the requirement of environmental monitoring central station according to China Environmental Monitoring General Station, Ji acrylonitrile plant AOGC device has been carried out the spot sampling monitoring checked and accepted, testing result satisfies the environment protection control requirements of national Specification fully.

Claims (10)

1, a kind of catalytic oxidation process for treating of tail gas from absorption tower of acrylonitrile installation, it is characterized in that tail gas from absorption tower mixes with air, fuel gas after electric heater or steam heater heating, with noble metal platinum, palladium honeycomb metal or ceramic honey comb as catalyst, at pressure 0～15kPa, temperature is to carry out catalytic oxidation in 100～720 ℃ the catalytic reactor, harmful volatile organic matter is converted into carbon dioxide and water, enters at last and enter atmosphere after tail gas heat exchanger reclaims heat.
2, the catalytic oxidation process for treating of tail gas from absorption tower of acrylonitrile installation according to claim 1 is characterized in that the catalytic reactor inlet temperature is 100～350 ℃, and outlet temperature is 350～750 ℃.
3, the catalytic oxidation process for treating of tail gas from absorption tower of acrylonitrile installation according to claim 2 is characterized in that the catalytic reactor inlet temperature is 300 ℃, and outlet temperature is below 720 ℃.
4, the catalytic oxidation process for treating of tail gas from absorption tower of acrylonitrile installation according to claim 1 is characterized in that: the adding of air, must satisfy oxygen surplus 0.1～3.0% in the reaction discharging gas.
5, the catalytic oxidation process for treating of tail gas from absorption tower of acrylonitrile installation according to claim 1 is characterized in that: tail gas from absorption tower enters catalytic reactor with after air or oxygen mixes after heater exhaust gas is heated to the catalyst initiation temperature.
6, the catalytic oxidation process for treating of tail gas from absorption tower of acrylonitrile installation according to claim 1 is characterized in that described heater exhaust gas is welded plate type heat exchanger or heat exchange of heat pipe or finned tube exchanger.
7, the catalytic oxidation process for treating of tail gas from absorption tower of acrylonitrile installation according to claim 1 is characterized in that this catalytic oxidation process for treating adopts steam heater, electric heater, oil burner, gas burner to carry out system's intensification and goes into operation.
8, the catalytic oxidation process for treating of tail gas from absorption tower of acrylonitrile installation according to claim 1 is characterized in that this catalytic oxidation process for treating has adopted electric heater or steam heater, catalyst oxidation reactor and tail gas exchanging air.
9, the catalytic oxidation process for treating of tail gas from absorption tower of acrylonitrile installation according to claim 1, it is characterized in that described catalyst oxidation reactor can adopt the fixed bed catalytic oxidation reactor, this fixed bed catalytic oxidation reactor is made up of two manholes, gas access, gas vent and catalyst fixed bed layer, catalyst fixed bed layer is positioned at reactor central authorities, the gas access is positioned at the reactor left side, gas vent is positioned at the reactor right side, and two manholes are positioned at reactor top.
10, the catalytic oxidation process for treating of tail gas from absorption tower of acrylonitrile installation according to claim 9, it is characterized in that having the bypass valve of a conditioned reaction device inlet temperature, the bypass valve of a control reactor inlet temperature is arranged in the catalyst oxidation reactor exit in described catalyst oxidation reactor porch.
CNB2005100281805A 2005-07-27 2005-07-27 Catalytic oxidation process for treating tail gas from absorption tower of acrylonitrile installation Ceased CN100417433C (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101362051A (en) * 2008-09-27 2009-02-11 上海东化环境工程有限公司 Acrylonitrile device tail-gas treatment technique
CN102872692A (en) * 2012-09-19 2013-01-16 上海凯鸿环保工程有限公司 Operation control system for acrylonitrile absorption tower tail gas treatment
CN103212288A (en) * 2013-04-01 2013-07-24 北京化工大学 Method for removing acrylonitrile waste gas
CN104941419A (en) * 2014-03-31 2015-09-30 英尼奥斯欧洲股份公司 Modified ammonia removal system of reactor effluent
WO2017121022A1 (en) * 2016-01-12 2017-07-20 北京化工大学 Integrated purification method and system for industrial waste gas containing cyanides, hydrocarbons and nox

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101362051A (en) * 2008-09-27 2009-02-11 上海东化环境工程有限公司 Acrylonitrile device tail-gas treatment technique
CN102872692A (en) * 2012-09-19 2013-01-16 上海凯鸿环保工程有限公司 Operation control system for acrylonitrile absorption tower tail gas treatment
CN103212288A (en) * 2013-04-01 2013-07-24 北京化工大学 Method for removing acrylonitrile waste gas
CN103212288B (en) * 2013-04-01 2015-08-05 北京化工大学 A kind of method for removing acrylonitrile waste gas
CN104941419A (en) * 2014-03-31 2015-09-30 英尼奥斯欧洲股份公司 Modified ammonia removal system of reactor effluent
WO2017121022A1 (en) * 2016-01-12 2017-07-20 北京化工大学 Integrated purification method and system for industrial waste gas containing cyanides, hydrocarbons and nox
US10315160B2 (en) 2016-01-12 2019-06-11 Beijing University Of Chemical Technology Integrated purification method and system for the industrial exhaust gas containing cyanides, hydrocarbons and NOx

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