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Method for removing waste gas containing HCN by platinum catalyst

A platinum catalyst and catalyst technology, applied in the field of HCN removal, can solve the problems of high energy consumption, inability to remove NH3 and tar, etc., and achieve the effects of energy saving, easy operation, and reduced heat supply

Inactive Publication Date: 2003-03-26
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method also has the inability to remove NH 3 and tar problems
The combustion method is to combine HCN with O at high temperature (>900°C) 2 The reaction is carried out to oxidize HCN to generate H 2 O.CO 2 , N 2 And harmless, but due to the need for higher temperature, part of the nitrogen is transformed into N 2 At the same time, another pollutant, NO x , and to achieve and maintain high temperature also requires high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach ： Embodiment 1：Pt(0.07mm) to 450℃，30000h-1HCN(10ppm)、NH3(50ppm)、(1vol％)，，5％。 test ：HCN1.44ppm( test approach ：TJ36-79，-)；NH33ppm( test approach ：TJ36-79，)；0.01％( test approach ：)。 test to NOx(Elektron-NOx test test )。 Embodiment 2：Pt(0.09mm) to 550℃，5000h-1HCN(10％)、NH3(10％)、(1vol％)，，50％。 test ：HCN1.89ppm；NH398ppm；0.01％。 test to NOx。 Embodiment 1。 Embodiment 3：Pt(0.08mm) to 350℃，10000h-1HCN(1％)、NH3(3％)、(5vol％)，，30％。 test ：HCN1.96ppm；NH379ppm；0.3％。 test to NOx。 Embodiment 1。 Embodiment 4：Pt(5mm) to 550℃，15000h-1HCN(50ppm)、NH3(500ppm)、(1vol％)，，10％。 test ：HCN1.93ppm；NH353ppm；0.03％。 test to NOx。 Embodiment 1。 Embodiment 5：Pt(0.5mm) to 250℃，8000h-1HCN(10ppm)、NH3(100ppm)、(1vol％)，，5％。 test ：HCN1.42ppm；NH321ppm；0.2％。 test to NOx。 Embodiment 1。 Embodiment 6：Pt(1mm) to 550℃，10000h-1HCN(500ppm)、NH3(1vol％)、(10vol％)，，50％。 test ：HCN1.98ppm；NH365ppm；0.4％。 test to NOx。 Embodiment 1。 Embodiment 7：Pt(1mm) to 450℃，20000h-1HCN(10ppm)、NH3(20％)、(1vol％)，，40％。 test ：HCN1.21ppm；NH381ppm；0.2％。 test to NOx。 Embodiment 1。 Embodiment 8：Pt(5mm) to 350℃，5000h-1HCN(0.1vol％)、NH3(5vol％)、(5vol％)，，40％。 test ：HCN1.88ppm；NH377ppm；0.6％。 test to NOx。 Embodiment 1。 comparative example 1：0.5MNa2CO3100ml15000h-1100ppmHCN and 10vol％NH3， and CN-，HCN23ppm，NH3513ppm，。 comparative example 2：1g1200m2/g10000h-1200ppmHCN、1％ and 5vol％NH3，HCN62ppm，NH373ppm，0.85％。 comparative example 3

[0016] The specific embodiment: embodiment 1: the reaction furnace that will be equipped with net shape Pt catalyst (platinum wire diameter 0.07mm) is warmed up to 450 ℃, and the space velocity of feeding is 30000h -1 Contains HCN (10ppm), NH 3 (50ppm), tar (1vol%) waste gas, and air is introduced at the same time, and its volume accounts for 5% of the total volume. Detect the outlet concentration of gas at the reactor outlet: HCN is 1.44ppm (detection method: TJ36-79, i.e. isonicotinic acid-pyrazolone colorimetric method); 3 3ppm (detection method: TJ36-79, that is, Nessler's reagent spectrophotometry); tar 0.01% (detection method: gas chromatography). NO detected x (Elektron-NO produced by Draeger, Germany x tester detection). Embodiment 2: the reaction furnace that is equipped with mesh Pt catalyst (platinum wire diameter 0.09mm) is heated up to 550 ℃, and the space velocity of feeding is 5000h -1 containing HCN (10%), NH 3 (10%), tar (1vol%) waste gas, while passing ...

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Abstract

The method for cleaning waste gas containing HCN by using platinum as catalyst and adopting catalytic oxidation includes the following steps: placing the platinum catalyst into reaction furnace, then heating the reaction furnace to make its temperature be up to 250-550 deg.C, and feeding the N2 containing HCN, NH3 and tar, etc. into the reaction furnace, at the same time introducing air (its volume is 5%-50% of total volume of gas) to make catalytic oxidation to remove highly toxic and harmful gases. Said invention is simple in preparation, easy to operate, its temp. is lower, the gas containing nitrogen can not be converted into another contaminant NOx. Besides, it also can reduce energy consumption, in the course of cleaning waste gas the higher heat value of tar portion can be utilized, so that it can save energy consumption.

Description

[0001] Field: [0002] The invention belongs to a method for removing HCN, in particular to a method for removing waste gas containing HCN by using platinum as a catalyst through a catalytic oxidation method. Background technique: [0003] In the production process of polyacrylonitrile-based carbon fiber, it is inevitable to produce highly toxic gas HCN, harmful gas NH 3 If the exhaust gas such as tar and tar is discharged directly without treatment, it will inevitably cause serious environmental pollution, and even endanger the survival of animals and plants, especially the high toxicity of HCN, which makes people poisoned after being exposed to 20ppmHCN in the air for several hours. The lethal dose for humans is 1mg / kg body weight. Therefore, it is of great significance to study the removal of HCN for the development of carbon fiber industry and the protection of ecological environment. [0004] At present, there are three main methods for removing HCN: solution absorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/46B01D53/54B01D53/72B01D53/86B01J23/42C01C3/00
Inventor 凌立成李开喜张奉民贺福
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI