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Method and device for increasing chroma of finished ethylene glycol product

A technology of ethylene glycol and crude ethylene glycol, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as inability to remove oxalic acid

Inactive Publication Date: 2013-12-11
ANHUI HUAIHUA
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Problems solved by technology

[0007] In the gas scrubber of the carbonylation process, the methanol used as the absorbing liquid has a water content in accordance with the national standard for methanol, and the H2O in the high-grade product is also 0.1%. A small amount of water in the methanol absorption liquid in the tower will hydrolyze with DMO to form oxalic acid, making the kettle liquid weakly acidic, and the methanol separation tower cannot remove oxalic acid, which eventually leads to the weak acidity of hydrogenation product crude ethylene glycol

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  • Method and device for increasing chroma of finished ethylene glycol product
  • Method and device for increasing chroma of finished ethylene glycol product

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Embodiment Construction

[0018] For further illustrating the present invention, specifically illustrate in conjunction with following examples:

[0019] Such as figure 2 Shown, a kind of synthesis gas system ethylene glycol industrial device is in the synthesis gas system ethylene glycol industrial device, a lye storage tank 15 is added at the top of the crude ethylene glycol tank wherein, for the prepared The lye is added into the crude ethylene glycol tank; the lye is prepared from 90% methanol and 10% alkali.

[0020] The lye is used to neutralize the oxalic acid in the crude ethylene glycol, and can be selected according to the experience of the technicians. The alkali that can be used includes but is not limited to sodium hydroxide, potassium hydroxide, sodium bicarbonate, etc. After adding this to the crude ethylene glycol tank, it was stirred. After such treatment, it will be found that the color of the crude ethylene glycol changes from the original yellowish color to a clear and transparen...

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Abstract

The invention relates to a method for increasing the chroma of a finished ethylene glycol product, which is implemented through adding prepared alkaline liquor from a spare flange port at the top of a crude ethylene glycol tank in an industrial device for producing ethylene glycol by using synthesis gas, wherein the alkaline liquor is prepared from 90% of methanol and 10% of alkali; and after the alkaline liquor is added into the crude ethylene glycol tank, stirring the obtained product. After the method and device disclosed by the invention are applied to a process of producing ethylene glycol by using synthesis gas, a situation that the chroma of an ethylene glycol product reaches a required quality index can be ensured.

Description

technical field [0001] The invention relates to a method for improving the chroma of ethylene glycol products, in particular to a method and a device for improving the chroma of ethylene glycol products in an industrial device for producing ethylene glycol from synthetic gas. Background technique [0002] The synthesis gas-to-ethylene glycol process route includes four processes: esterification, carbonylation, hydrogenation and refining. The current state of the art technology figure 1 Shown: [0003] Methyl nitrite CH from the esterification process 3 ONO (referred to as MN) and CO from outside the world enter the carbonylation reactor, at a certain temperature, a certain pressure and Pt / Al 2 o 3 Under the action of the catalyst, the following carbonylation reaction occurs: 2CH 3 ONO+2CO→(COOCH 3 ) 2 +2NO, the resulting dimethyl oxalate (COOCH 3 ) 2 (DMO for short) enters the gas-liquid separator for separation after being condensed, and a small amount of DMO that ...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/88
Inventor 段巍李红杨自军余水情万亚丽王珊
Owner ANHUI HUAIHUA
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