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A treatment device and method for dimethyl oxalate waste gas

A dimethyl oxalate and treatment method technology, applied in the field of treatment technology for dimethyl oxalate waste gas and comprehensive treatment device for dimethyl oxalate waste gas, can solve the problems of difficult effective treatment, acidic solution generation, high freezing point, etc., and achieve Efficient removal and resource utilization, high removal rate, and increased safety level

Active Publication Date: 2021-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the problem that dimethyl oxalate is difficult to effectively treat due to its high freezing point, easy hydrolysis, and acidic solution after hydrolysis, and realizes efficient treatment and resource utilization of such waste gas

Method used

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  • A treatment device and method for dimethyl oxalate waste gas
  • A treatment device and method for dimethyl oxalate waste gas
  • A treatment device and method for dimethyl oxalate waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Treatment of high-concentration dimethyl oxalate exhaust gas, the exhaust gas composition: nitrogen 86% (volume fraction), dimethyl oxalate 105000mg / m 3 , Methanol 100000mg / m 3 , ethanol 61000mg / m 3 , ethylene glycol 41500mg / m 3 , other hydrocarbons 8000mg / m 3 . Other hydrocarbons mainly include alkanes, olefins and a small amount of aromatics and halogenated hydrocarbons. The total gas flow rate is 100~300m 3 / h, the temperature is lower than 120°C, the washing unit adopts a spray tower, the superficial speed of the tower is 2.0m / s, the overall size is Φ3600×8500mm, the quantity is 2, the amount of softened water is 105t / h, and the material of the washing unit is 304 stainless steel; the membrane Component parameters, material POMS, filling volume 40㎡, methanol / nitrogen separation coefficient 38.5, methanol oxygen separation coefficient 20.4, permeation flux 1.25-1.48m 3 / ㎡h; adsorption tank parameters, carbon-based activated carbon adsorbent, adsorbent iodine ad...

Embodiment 2

[0045] Treat the exhaust gas discharged from the breathing valve of the dimethyl oxalate storage tank, the exhaust gas composition: air 98% (volume fraction), dimethyl oxalate 5700mg / m 3 , Methanol 12mg / m 3 , ethanol 15mg / m 3 , ethylene glycol 3mg / m 3 , other hydrocarbons 200mg / m 3 . Other hydrocarbons mainly include alkanes and alkenes. The total flow of gas flow is 200m 3 / h, temperature 70°C (±5°C), washing unit adopts packed tower, superficial velocity 2.0m / s, external dimension, Φ2200×5000mm, quantity 2, demineralized water consumption 40t / h, washing unit material stainless steel; Membrane module parameters, material PDMS, filling volume 20㎡, methanol / nitrogen separation coefficient 33.5, methanol oxygen separation coefficient 18.6, permeation flux 1.85-2.10m 3 / ㎡h; adsorption tank parameters, molecular sieve adsorbent, iodine adsorption value of the adsorbent 600-900mg / g, filling capacity 3.6t, adsorption tank size Φ3200×6000mm, quantity 2 sets.

[0046] The main ...

Embodiment 3

[0053] Treatment of dimethyl oxalate special platform exhaust gas, the exhaust gas composition: air 97% (volume fraction), dimethyl oxalate 10600mg / m 3 , Methanol 7800mg / m 3 , ethanol 5600mg / m 3 , Ethylene glycol 1000mg / m 3 , other hydrocarbons 500mg / m 3 . The total gas flow rate is 400m 3 / h, temperature 70°C (±5°C). Device parameters: The packing unit is used for hydrolysis and absorption process, the superficial velocity is 1.5m / s, the overall size is Φ2800×6000mm, the quantity is 2, the softened water consumption is 80t / h, the material of the washing unit is glass fiber reinforced plastic; the parameters of the membrane module, the material is PDMS, The filling volume is 20㎡, the separation coefficient of methanol / nitrogen is 33.5, the separation coefficient of methanol and oxygen is 18.6, and the permeation flux is 1.85-2.10m 3 / ㎡h; parameters of adsorption tank, organic adsorbent (resin), ratio of adsorbed organic matter to its own weight, 1:20, filling capacity 3....

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Abstract

The invention relates to a treatment device and method for dimethyl oxalate waste gas, belonging to the field of waste gas treatment. Dimethyl oxalate waste gas first enters the water washing unit for water washing and hydrolysis process. The outlet of the water washing unit is connected to the demisting device. After demisting, the waste gas enters the membrane separation unit, and the permeation side of the membrane separation is connected to the vacuum pump to make the methanol and residual A small amount of dimethyl oxalate preferentially permeates the membrane to form a higher concentration of permeate-side gas. The permeate-side gas is discharged from the vacuum pump and enters the condenser to condense to obtain relatively pure methanol for reuse. The low-concentration gas on the retentate side of the membrane module enters the adsorption unit for advanced treatment. When the adsorbent is saturated for a certain period of time, vacuum desorption is used to regenerate the adsorbent. The regenerated high-concentration methanol and dimethyl oxalate gas enter the condenser and condense into liquid for reuse. The desorption regeneration of the adsorbent can greatly extend the life of the device. Life expectancy, and to maintain the indicators of tail gas, the gas after adsorption can meet the standard discharge.

Description

technical field [0001] The invention relates to a comprehensive treatment device and method for dimethyl oxalate waste gas, which belongs to the field of waste gas treatment and is mainly used in the fields of coal chemical industry and pharmacy to treat dimethyl oxalate waste gas produced by tank farms and process devices. Specifically, it is a treatment technology for dimethyl oxalate waste gas formed by optimizing and improving water washing, membrane separation, condensation and pressure swing adsorption recovery technologies, and coupling them. Background technique [0002] With the improvement of the country's economic level and the transformation of people's ideas, the environmental protection indicators of chemical companies have been continuously improved. Dimethyl oxalate has the characteristics of high freezing point, easy hydrolysis, and acid solution after hydrolysis. The temperature and oxygen content of the exhaust gas are high. The acidic solution after hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/00B01D53/02B01D53/14B01D53/18B01D53/22
CPCB01D53/002B01D53/02B01D53/1487B01D53/18B01D53/229B01D2053/221B01D2257/70B01D2257/704
Inventor 魏昕栾金义杨丽杨永强李宇
Owner CHINA PETROLEUM & CHEM CORP
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