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Method and device for treating waste gas and waste liquid in ethylene glycol production

A technology of ethylene glycol and waste gas, which is applied in the direction of chemical instruments and methods, separation methods, and separation of dispersed particles, can solve the problems of waste gas and waste liquid pollution of the environment, and achieve the effect of solving environmental pollution problems

Active Publication Date: 2013-05-15
PUJING CHEM IND SHA
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Problems solved by technology

[0021] The purpose of the invention of this application is to overcome the problem of environmental pollution caused by waste gas and waste liquid produced in the production of ethylene glycol, and to provide a method and device for treating the waste gas and waste liquid produced in the production of ethylene glycol

Method used

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  • Method and device for treating waste gas and waste liquid in ethylene glycol production

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Embodiment Construction

[0046] A kind of method of the present invention is used to process waste gas and waste liquid that produces in ethylene glycol production, and it comprises the following steps:

[0047](a) The exhaust gas produced in the production of ethylene glycol is heated to 200°C through the heat exchanger 1, and the heat exchanger 1 uses the reacted gas discharged from the reactor 3 in step b to heat the gas entering the heat exchanger The exhaust gas in 1; after being heated by heat exchanger 1, the exhaust gas is heated to 230°C-240°C by heater 2, preferably 235°C;

[0048] (b) Send the heated exhaust gas into the reactor (3), which is equipped with a platinum / alumina catalyst. Under the action of the catalyst, the methyl nitrite in the exhaust gas reacts to form methanol, and the exhaust gas Nitric oxide, hydrogen and carbon monoxide interact to form nitrogen, water, carbon dioxide and ammonia, and the reaction formula is as follows:

[0049] CH 3 ONO+H 2 =CH 3 OH+NO

[0050] N...

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Abstract

The invention relates to a method and a device for treating waste gas and waste liquid in ethylene glycol production. The method comprises the following steps of: heating waste gas generated in ethylene glycol production; feeding the heated waste gas into a reactor, reacting methyl nitrite in the waste gas to generate methanol in the presence of a catalyst, and interacting nitric oxide, hydrogen and carbon monoxide in the waste gas to generate nitrogen, water, carbon dioxide and ammonia; feeding the generated waste liquid into an absorption tower in ethylene glycol production, allowing the waste liquid to enter from the upper part of the absorption tower, allowing the reacted gas to enter from the lower part of the absorption tower, fully absorbing the gas through the waste liquid, neutralizing the waste liquid which absorbs the gas through an alkali liquor, and discharging the gas from the absorption tower for gasification, and adding the gasified gas into coal slurry for treatment; and discharging the residual gas into the atmosphere from the top of the absorption tower. The device comprises a heat exchanger, a heater, a reactor, a cooler, an absorption tower and a waste liquid cooler. The environmental pollution problems in the waste gas and waste liquid generated in the industrial ethylene glycol production in the conventional synthesis gas production are solved.

Description

technical field [0001] The invention relates to a method and device for treating waste gas and waste liquid produced in ethylene glycol production, in particular to a method and device for treating waste liquid and waste gas produced in existing ethylene glycol production devices. Background technique [0002] The existing industrial production process of syngas to produce ethylene glycol includes: esterification process, carbonylation process, hydrogenation process and refining process, and its reaction equation is as follows: [0003] 1. Esterification process: [0004] Main reaction: [0005] 2NO+2CH 3 OH (methanol) +1 / 2O 2 —→2CH 3 ONO (methyl nitrite) + H 2 o [0006] Side reaction: NO 2 +H 2 O—→HNO 3 [0007] 2. Carbonylation process: [0008] Main reaction: [0009] 2CO+2CH 3 ONO (methyl nitrite)—→(COOCH 3 ) 2 (Dimethyl oxalate) +2NO [0010] 3. Hydrogenation process: [0011] Main reaction: [0012] (COOCH 3 ) 2 (Dimethyl oxalate) + 4H 2 —→(CH 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56B01D53/18
Inventor 李久玉
Owner PUJING CHEM IND SHA
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