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

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 ...

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

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