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Method and system for purifying exhaust gas containing hydrogen chloride gas and organic chlorine compound gas

A hydrogen chloride gas and waste gas purification technology, applied in gas treatment, chemical instruments and methods, separation methods, etc., can solve problems such as poor economy, hidden safety hazards, perforation leakage, etc., achieve good economic benefits, improve service life, and avoid dew point corrosion. Effect

Inactive Publication Date: 2019-07-23
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process of this invention is relatively cumbersome, the operating cost is relatively high, and the economy is poor.
And because there will be a certain amount of HCl and water vapor in the chlorine-containing waste gas, HCl and water vapor will condense on the reactor wall and the pipe wall below 150 ° C, resulting in thinning of the metal material, perforation leakage, etc. Security risks

Method used

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  • Method and system for purifying exhaust gas containing hydrogen chloride gas and organic chlorine compound gas
  • Method and system for purifying exhaust gas containing hydrogen chloride gas and organic chlorine compound gas
  • Method and system for purifying exhaust gas containing hydrogen chloride gas and organic chlorine compound gas

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment adopts figure 1 In the process shown, the reaction adopts a fixed-bed reactor. In the waste gas containing hydrogen chloride gas and organic chlorine compound gas in this embodiment, the organic chlorine compound is chlorobenzene, and the concentration of chlorobenzene is 5024.9mg / Nm 3 , HCl content is 150 mg / Nm 3 .

[0042] The catalyst used in the fixed-bed reactor of this example is a supported transition metal oxide catalyst, and the catalyst carrier is TiO 2 , the active component of the catalyst is Cr 2 o 3 and V 2 o 5 , V 2 o 5 The loading is 7%, Cr 2 o 3 The loading capacity of the catalyst is 3%, the impregnation method is adopted during the preparation of the catalyst, and the particle size of the catalyst is 2-4mm.

[0043] (1) After the above-mentioned chlorine-containing waste gas is mixed with air, the mixed gas is blown by a fan at 1300m 3 / h access figure 1 The chlorine-containing exhaust gas purification device, wherein the a...

Embodiment 2

[0049] This embodiment adopts figure 1 In the process shown, the reaction adopts a fixed-bed reactor. In the waste gas containing hydrogen chloride gas and organic chlorine compound gas in this embodiment, the organic chlorine compound is dichloromethane, and the concentration of dichloromethane is 13270.3mg / Nm 3 , HCl content is 200mg / Nm 3 .

[0050] The catalyst used in the fixed-bed reactor of this embodiment is a supported transition metal oxide catalyst, and the catalyst carrier is Al 2 o 3 , the active component of the catalyst is Cr 2 o 3 , Cr 2 o 3 The loading capacity of the catalyst is 8%, the impregnation method is adopted during the preparation of the catalyst, and the particle size of the catalyst is 2-4mm.

[0051] (1) After the above-mentioned chlorine-containing waste gas is mixed with air, the mixed gas is blown by a fan at 1100m 3 / h access figure 1 The chlorine-containing waste gas purification device, wherein the air flow is 100m 3 / h.

[0052] ...

Embodiment 3

[0057] This embodiment adopts figure 1 In the process shown, the reaction adopts a fixed-bed reactor. In the waste gas containing hydrogen chloride gas and organic chlorine compound gas in this embodiment, the organic chlorine compound is 1,2 dichloroethane, and the concentration of 1,2 dichloroethane 11487.6 mg / Nm 3 , HCl content is 500mg / Nm 3 .

[0058] The catalyst used in the fixed-bed reactor of this embodiment is a supported transition metal oxide catalyst, and the catalyst carrier is Al 2 o 3 , the active component of the catalyst is Cr 2 o 3 and CeO 2 , Cr 2 o 3 The loading is 8%, CeO 2 The loading capacity of the catalyst is 12%, the impregnation method is adopted during the preparation of the catalyst, and the particle size of the catalyst is 2-4mm.

[0059] (1) After the above-mentioned chlorine-containing waste gas is mixed with air, the mixed gas is blown by a fan at 1200m 3 / h access figure 1 The chlorine-containing waste gas purification device, wher...

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Abstract

The invention discloses a method for purifying an exhaust gas containing a hydrogen chloride gas and an organic chlorine compound gas. The method comprises the following steps: introducing a mixed gasof exhaust gas and air into a graphite preheater for preheating; exchanging heat and rising temperature by introducing a high-temperature gas from a shell side of a heat exchanger A and a fixed bed reactor; introducing the mixed gas into the fixed bed reactor for catalytic oxidation reaction; introducing high-temperature gas after reaction into a tube pass of the heat exchanger A, exchanging heatand cooling; introducing the cooled gas into a spraying washer for absorbing an acidic gas, and then introducing into a gas-liquid separator and directly discharging the gas. According to the invention, the method for catalytic oxidation by using the fixed bed reactor is adopted for efficiently low-cost treating the exhaust gas containing the hydrogen chloride gas and the organic chlorine compound gas; the graphite preheater is adopted for preheating the mixed gas, so that the dew point corrosion of HCl gas to the pipeline and the heat exchanger can be reduced; the high-temperature exhaust gas after catalytic oxidation exchanges heat with the to-be-treated exhaust gas through the heat exchanger, so that reaction heat can be fully utilized; the method has higher economic benefits.

Description

technical field [0001] The invention relates to the field of waste gas treatment, in particular to a method and system for purifying waste gas containing hydrogen chloride gas and organic chlorine compound gas. Background technique [0002] In recent years, environmental pollution has become a hot topic of concern and discussion in the international and domestic communities. Among various factors that lead to environmental pollution, volatile organic compounds (VOCs) have become an important source of air pollution and have attracted more and more attention. [0003] Among them, chlorine-containing volatile organic compounds (CVOCs) are widely used in industry, agriculture, pesticides, medicine, organic synthesis and other fields. However, CVOCs will enter the environment through volatilization, leakage, and emissions during the application process, which will cause damage to the ozone layer, photochemical smog, and global warming. Moreover, CVOCs are difficult to biodegrad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/86B01D53/78B01D53/68B01D53/70
CPCB01D53/75B01D53/8659B01D53/8662B01D53/78B01D2251/304B01D2257/2064B01D2257/2045B01D2255/20784B01D2255/20723B01D2255/20707B01D2255/2065B01D2255/2092
Inventor 陈献乔旭蒲霄崔咪芬汤吉海费兆阳刘清张竹修
Owner NANJING UNIV OF TECH
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