Method for regeneration, absorption and removal of NO, alkyl nitrite, CO and N2O in tail gas from oxalate synthesis process adopting CO carbonyl coupling

A technology of alkyl nitrite and process tail gas, which is applied in chemical instruments and methods, combustion methods, separation methods, etc., can solve problems such as polluting the environment, catalyst deactivation, and unsatisfactory effects, and achieve good social benefits and prevent pollution Atmospheric, good economic benefits

Active Publication Date: 2016-11-23
HIGHCHEM TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using the catalyst to treat N 2 The effect of O is not ideal, and methyl nitrite will quickly deactivate the catalyst
[0006] CN 101357336 A discloses a high-temperature catalytic decomposition of N 2 O method, at high temperature the N 2 O breaks down to N 2 and O 2 , solved for N 2 The problem of polluting the environment
However, this method cannot handle NO
[0007] In the prior art methods, only a certain component in the process tail gas can be treated in a targeted manner, and there is no method that can simultaneously remove all toxic and harmful components in the process tail gas

Method used

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  • Method for regeneration, absorption and removal of NO, alkyl nitrite, CO and N2O in tail gas from oxalate synthesis process adopting CO carbonyl coupling
  • Method for regeneration, absorption and removal of NO, alkyl nitrite, CO and N2O in tail gas from oxalate synthesis process adopting CO carbonyl coupling
  • Method for regeneration, absorption and removal of NO, alkyl nitrite, CO and N2O in tail gas from oxalate synthesis process adopting CO carbonyl coupling

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] according to figure 1 , will be 1378m 3 / h contains NO 3.5% by volume, CH 3 ONO 10.0vol%, CO 13.0vol%, N 2 O 0.8% by volume and balance N 2 CO carbonyl coupling synthesis of oxalate process tail gas with 512m 3 / h air is sent from the bottom of the tower into the packed tower as the regeneration absorption tower of alkyl nitrite (the temperature in the tower is -12 ℃, and the pressure at the top of the tower is 0.1MPaG), and the 4400m 3 / h Methanol with a temperature of -10°C is sent from the top of the tower to the packed tower, and the gas mixture of the process tail gas and air and methanol are countercurrently contacted in the tower, thereby obtaining CH at the bottom of the tower 3 Methanol solution of ONO. CH 3 ONO in methanol is withdrawn from the bottom of the column and recycled to the CO carbonyl coupling synthesis of oxalate. Add 150m online to the gas mixture taken from the top of the packed column 3 / h CH 4 , and then burned in a high-temperature c...

Embodiment 2

[0066] according to figure 1 , the 1500m 3 / h contains NO 9.0% by volume, CH 3 CH 2 ONO 12.0vol%, CO 15.0vol%, N 2 O 1.1% by volume and balance N 2 CO carbonyl coupling synthesis of oxalate process tail gas with 615m 3 / h air is sent from the bottom of the tower into the packed tower as the regeneration absorption tower of alkyl nitrite (the temperature in the tower is -2 ℃, and the pressure at the top of the tower is 0.1MPaG), and the 5000m 3 / h Ethanol with a temperature of -2°C is sent from the top of the tower into the packed tower, and the gas mixture of process tail gas and air and ethanol are countercurrently contacted in the tower, thereby obtaining CH at the bottom of the tower 3 CH2 Ethanol solution of ONO. CH 3 CH 2 The ethanol solution of ONO is withdrawn from the bottom of the column and recycled to CO carbonyl coupling synthesis of oxalate. Add 175m online to the gas mixture taken from the top of the packed column 3 / h CH 4 and 10m 3 / h H 2 , and the...

Embodiment 3-6

[0068] The reaction conditions and experimental results are shown in Table 1 below.

[0069] Table 1

[0070]

[0071]

[0072] a) The remainder is N 2 ; b) the remainder is N 2 , CO 2 and H 2 O.

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Abstract

The invention relates to a method for regeneration, absorption and removal of NO, alkyl nitrite, CO and N2O in tail gas from an oxalate synthesis process adopting CO carbonyl coupling. The method is characterized in that before emptying, tail gas from the oxalate synthesis process adopting CO carbonyl coupling is subjected to the following process steps: a) regeneration and absorption in an alkyl nitrite regeneration and absorption tower; b) high-temperature combustion in a high-temperature combustion furnace; c) catalytic reduction in a catalytic reduction reactor; d) combustion in a combustion device. The invention also relates to a system comprising the alkyl nitrite regeneration and absorption tower, the high-temperature combustion furnace, the catalytic reduction reactor and the combustion device. The method is simple and reliable, can recover NO and alkyl nitrite in the tail gas from the oxalate synthesis process adopting CO carbonyl coupling and reduces the operation cost, thereby having quite good economic benefit. Besides, CO and N2O in the tail gas can be removed, atmospheric pollution is prevented, and accordingly, good social benefit is realized.

Description

technical field [0001] The invention relates to regeneration, absorption and removal of NO, alkyl nitrite, CO and N in tail gas of CO carbonyl coupling synthesis of oxalate 2 O method for regenerating, absorbing and removing NO, alkyl nitrite, CO and N from tail gas of CO carbonyl coupling synthesis oxalate process 2 O's system. Background technique [0002] With the increasing number of industrialized production units for preparing ethylene glycol from coal, the tail gas produced by the process route of preparing ethylene glycol from coal has also received more and more attention. The production of ethylene glycol from coal involves first synthesizing oxalate from coal and then hydrogenating the oxalate to produce ethylene glycol, where the first process step produces a process tail gas containing nitrogen oxides whose composition is roughly as follows: NO 2-15 vol %, alkyl nitrite (RONO) 5-15 volume%, CO 10-20 volume%, N 2 O 0.1-3.0% by volume and balance N 2 . These ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56F23G7/06B01D53/14
CPCY02A50/20
Inventor 肖招金单文波李世虎周伟毛宇杰余海清魏岩
Owner HIGHCHEM TECH CO LTD
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