Method for recycling CO to produce nitrogen oxides in oxalate tail gas

A technology for producing nitrogen oxides and oxalate esters, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of unrecycled use, etc., and achieve the effects of protecting the environment, reducing emissions, and saving costs

Active Publication Date: 2015-08-05
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In view of this, the purpose of this invention is to provide a kind of method that recycles CO to make nitrogen oxides in the oxalate tail gas, mainly solves the existing technology only nitrogen oxides is removed, and does not add the problem of recycling, can improve The utilization rate of nitrogen oxides reduces the emission of pollutants

Method used

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  • Method for recycling CO to produce nitrogen oxides in oxalate tail gas

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The tail gas discharged from the top of the regeneration reactor contains 12% by volume of ethyl nitrite, 4% by volume of nitrogen monoxide, 19% by volume of carbon monoxide, and 65% by volume of nitrogen. Spray ethanol, the weight ratio of ethanol to ethyl nitrite is 3: 1, the operating temperature is 20°C, the operating pressure is 5.0 Mpa, and the liquid in the alkyl alcohol washing tower tank is discharged into the regeneration reactor of CO oxalate ester production , the gas at the top of the alkyl alcohol scrubber reacts with oxygen to oxidize NO in nitrogen oxides to NO 2 , and then enter the water scrubber to contact with water, the liquid in the water scrubber tank returns to the nitric acid concentration tower; part of the gas at the top of the water scrubber is mixed with the gas at the top of the alkyl alcohol scrubber, and then mixed with oxygen Contact, control of NO and O in the mixed gas 2 The volume ratio of the nitrogen oxides is 1:4, and the other pa...

Embodiment 2

[0038] The tail gas discharged from the top of the regeneration reactor contains 6% methyl nitrite, 8% nitrogen monoxide, 25% carbon monoxide, and 61% nitrogen by volume percentage. The upper part of the tower is sprayed with methanol, the weight ratio of methanol to methyl nitrite is 10:1, the operating temperature is 20°C, and the operating pressure is 0.1 MPa. The liquid in the tower tank of the alkyl alcohol washing tower is discharged into the regeneration of oxalate Reactor, the gas at the top of the alkyl alcohol scrubber reacts with oxygen to oxidize NO in nitrogen oxides to NO 2 , and then enter the water scrubber to contact with water, the liquid in the water scrubber tank returns to the nitric acid concentration tower; part of the gas at the top of the water scrubber is mixed with the gas at the top of the alkyl alcohol scrubber, and then mixed with oxygen Contact, control of NO and O in the mixed gas 2 The volume ratio of the nitrogen oxides is 2:1, and the other ...

Embodiment 3

[0040] The tail gas discharged from the top of the regeneration reactor contains 11% by volume of n-butyl nitrite, 10% by volume of nitrogen monoxide, 24% by volume of carbon monoxide, and 55% by volume of nitrogen. It enters from the bottom of the alkyl alcohol scrubber, and the alkyl alcohol scrubber The upper part is sprayed with n-butanol, the weight ratio of n-butanol to n-butyl nitrite is 8:1, the operating temperature is 50°C, and the operating pressure is 3.0 MPa. Ester regeneration reactor, the gas at the top of the alkyl alcohol scrubber reacts with oxygen to oxidize NO in nitrogen oxides to NO 2 , and then enter the water scrubber to contact with water, the liquid in the water scrubber tank returns to the nitric acid concentration tower; part of the gas at the top of the water scrubber is mixed with the gas at the top of the alkyl alcohol scrubber, and then mixed with oxygen Contact, control of NO and O in the mixed gas 2 The volume ratio of the nitrogen oxides is ...

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Abstract

The invention discloses a method for recycling nitrogen oxide in a tail gas by means of production of oxalate with CO. The method comprises the following steps that nitrous acid ester in the tail gas is absorbed by alkyl alcohol, absorption liquid is recycled in a regeneration reactor, meanwhile, the tail gas absorbed by the alkyl alcohol is firstly contacted with O2 to convert NO in the tail gas into NO2, the NO2 is converted into nitric acid and NO in a water washing tower, the generated nitric acid can be concentrated in a nitric acid concentration tower to be recycled, the NO is returned to react with oxygen and is conveyed into the water washing tower to be circularly absorbed, the nitrogen oxide in the exhausted tail gas can be decreased to be less than 100 ppm after continuous oxidization and water washing absorption, and most nitrogen oxide is recycled at the same time, so that the nitrogen oxide and the nitrous acid ester in the tail gas are effectively recycled, the utilization rate of the nitrogen oxide is improved, the pollutant emission is greatly decreased, the environment is protected and the cost is saved.

Description

technical field [0001] The invention relates to a method for recycling nitrogen oxides in tail gas, in particular to a method for recycling CO to produce nitrogen oxides in tail gas of oxalate. Background technique [0002] As a degradable and environmentally friendly engineering plastic monomer, oxalate has attracted more and more international attention, and it is also an important organic chemical raw material, widely used in the production of various dyes, medicines, important solvents, extractants and other fields. The CO gas-phase coupling synthesis process of oxalate was first proposed by Ube Industries of Japan and Monte Edison of Italy (USP 4229591, 1980; USP 4461909, 1984). Taking the synthesis of diethyl oxalate as an example, CO and ethyl nitrite undergo a coupling reaction to generate diethyl oxalate and NO, and then the generated NO is separated and reacted with ethanol and oxygen to produce ethyl nitrite and return to the coupling The reaction is recycled, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/56
Inventor 李扬胡玉容夏伟范鑫袁小金许红云王科
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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