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Device and method fortreating dimethyl oxalate exhaust gas

A technology of dimethyl oxalate and treatment equipment, which is applied in the direction of gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of difficult effective treatment, acid solution production, high freezing point, etc., and achieve efficient removal and resource utilization, removal The effect of high efficiency, efficient treatment and resource utilization

Active Publication Date: 2019-10-18
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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  • Device and method fortreating dimethyl oxalate exhaust gas
  • Device and method fortreating dimethyl oxalate exhaust gas
  • Device and method fortreating dimethyl oxalate exhaust gas

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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 device and a method for treating dimethyl oxalate exhaust gas, and belongs to the field of exhaust gas treatment. The dimethyl oxalate exhaust gas enters a water washing unit for water washing and hydrolysis process, the outlet of the water washing unit is connected with a demisting device, the demisted exhaust gas enters a membrane separation unit, the permeating side of the membrane separation unit is connected with a vacuum pump so that methanol and a residual small amount of the dimethyl oxalatein the exhaust gas preferentially permeates through a membrane to formgaswith higher concentration on the permeating side, and the gas on the permeating side is discharged from the vacuum pump and then condensed into a condenser to obtain a relatively pure methanol forreuse;and the gas withlow concentration on the retentate side of a membrane assembly enters into an adsorption unit for advanced treatment. After a certain period of adsorption andan adsorbent is saturated, the adsorbent is regenerated by a method of vacuum desorption,the regenerated high-concentration methanol and dimethyl oxalate gas enter into the condenser to be condensed into liquid for reuse, through adsorbent desorption regeneration, the service life of the device can be greatly prolonged,theindex of the exhaust gas is kept, and the gas after absorption can be discharged to reach the standard.

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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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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