Waste polyester gas purification

A waste gas, polyester technology, applied in chemical instruments and methods, combustion methods, separation methods, etc., can solve the problems of people's health hazards, affecting the quality of the atmospheric environment in the factory area, and high equipment costs, reducing equipment investment and operating costs, Good economic and environmental benefits, high heat recovery efficiency

Inactive Publication Date: 2006-08-16
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These harmful substances are discharged into the air, seriously affecting the quality of the air environment in the factory area, and causing great harm to people's health.
[0003] The exhaust gas of most polyester plants in my country still adopts the direct discharge method. The polyester production line imported from abroad by some polyester production The adverse effects of the combustion efficiency of the coal furnace have not been able to achieve long-term incineration treatment, and they are still directly discharged into the atmosphere.
[0004] Some polyester production plants in China have established low-temperature water (10-20°C) washing treatment devices for vacuum polycondensation waste gas ...

Method used

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  • Waste polyester gas purification

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The honeycomb monolithic block catalyst loaded with precious metals is used. After passing through the gas-liquid separator, the exhaust gas is diluted with air to acetaldehyde content of 3766.4mg / m3 3 , 2-methyl-1,3-dioxolane 3854.7mg / m 3 , the reactor inlet temperature is 245°C, and the bed gas phase space velocity is 20000h -1 Under the conditions of the reaction tail gas, acetaldehyde and 2-methyl-1,3-dioxolane have been completely converted, and the concentration of non-methane total hydrocarbons in the tail gas is 0 mg / m 3 .

Embodiment 2

[0021] The honeycomb monolithic block catalyst loaded with precious metals is used. After the exhaust gas passes through the gas-liquid separator, it is diluted with air and part of the reaction tail gas to the acetaldehyde content of the mixed gas 4833.3mg / m3 3 , 2-methyl-1,3-dioxolane 5203.8mg / m 3 , the reactor inlet temperature is 245°C, and the gas phase space velocity of the bed is 25000h -1 Under the conditions, the acetaldehyde in the reaction tail gas has been completely converted, and the 2-methyl-1,3-dioxolane is 12.87mg / m 3 , the total non-methane hydrocarbon concentration is 16.02mg / m 3 .

Embodiment 3

[0023] The honeycomb monolithic block catalyst loaded with precious metals is used. After the exhaust gas passes through the gas-liquid separator, it is diluted with air and part of the reaction tail gas to contain acetaldehyde 5741.86mg / m in the mixed gas. 3 , 2-methyl-1,3-dioxolane 5547.95mg / m 3 , the reactor inlet temperature is 230°C, and the bed gas phase space velocity is 27000h -1 Under the conditions of the reaction tail gas, acetaldehyde and 2-methyl-1,3-dioxolane have been completely converted, and the concentration of non-methane total hydrocarbons is 0 mg / m 3 .

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Abstract

A process for treating the waste polyester gas generated by preparing poly-ethanediol terephthalate (PET) includes such steps as gas-liquid separation for removing the most of water, diluting it by mixing it with air, preheating, catalytic reaction under the action of catalyst which is the cellular blocks carrying noble metal, and returning the resultant tail gas back to diluting step and using it as the diluting gas.

Description

technical field [0001] The invention relates to a purification method of polyester waste gas, in particular to a purification method of polyester waste gas which utilizes a catalytic combustion method and recovers reaction heat with high efficiency, stable operation and good purification effect. Background technique [0002] A large amount of polyester waste gas is produced in the production process of polyethylene terephthalate (PET), and the waste gas comes from the stripping and vacuum polycondensation section of esterification wastewater. It mainly contains acetaldehyde, 2-methyl-1,3-dioxolane and a small amount of methane, butyraldehyde, dioxane, ethylene glycol and other organic pollutants, the concentration of which is 15000-25000mg / m 3 , far greater than the acetaldehyde 125mg / m stipulated in the National Environmental Protection Agency's "Comprehensive Emission Standards for Air Pollutants" (GB16297-1996) 3 and non-methane total hydrocarbons 120mg / m 3 emission lim...

Claims

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Application Information

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IPC IPC(8): B01D53/72B01D53/86F23G7/06
Inventor 崔凤霞李军周仁贤闫雨张丽梅杨力芳赵克品李卫伟
Owner CHINA PETROLEUM & CHEM CORP
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