Ethylene glycol production wastewater treatment method

A technology for producing waste water and treatment methods, applied in water/sewage treatment, neutralized water/sewage treatment, multi-stage water/sewage treatment, etc., to achieve the effects of reducing pressure and improving biochemical properties

Inactive Publication Date: 2017-11-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, there is no relevant specific report on the treatment method of the wastewater produced by the oxalate ester method to produce ethylene glycol.

Method used

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  • Ethylene glycol production wastewater treatment method

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Experimental program
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Effect test

Embodiment 1

[0037] A company’s oxalate method ethylene glycol production wastewater has a pH value of 1.0, a COD of 20,000 mg / L, and a TOC of 5,000 mg / L. 1,4-dioxane content 7000mg / L. Wastewater B / C was 0.014.

[0038] Carry out catalytic oxidation treatment to this waste water, the temperature control of catalytic oxidation reaction system is 90 ℃, pressure is normal pressure, pH is adjusted to 2.8 with alkali (sodium hydroxide solution or sodium carbonate solution or sodium bicarbonate solution), and total iron content is The dosage of 200mg / L, 27.5% hydrogen peroxide is 80ml per L of waste water (water from the stripping tower), and the reaction time is controlled to 60min.

[0039] Next, react for 20 minutes under the condition that the temperature of the wastewater is 90° C. and the pH of the wastewater is adjusted to 7.0 with 30% NaOH solution.

[0040] Next, gravity sedimentation separation was carried out under the condition that the temperature of the wastewater was 80° C., and...

Embodiment 2

[0043] A company’s oxalate method ethylene glycol production wastewater has a pH value of 1.0, a COD of 20,000 mg / L, and a TOC of 5,000 mg / L. 1,4-dioxane content 7000mg / L. Wastewater B / C was 0.014.

[0044] Carry out catalytic oxidation treatment to this waste water, the temperature control of catalytic oxidation reaction system is 80 ℃, pressure is normal pressure, pH is adjusted to 4.5 with alkali (sodium hydroxide solution or sodium carbonate solution or sodium bicarbonate solution), and total iron content is The amount of 50mg / L, 27.5% hydrogen peroxide is added according to 60ml per L of waste water (water from the stripping tower), and the reaction time is controlled to 10min.

[0045] Next, react for 5 minutes under the condition that the temperature of the wastewater is 80° C. and the pH of the wastewater is adjusted to 6.0 with NaOH solution.

[0046] Next, gravity sedimentation separation is carried out under the condition that the temperature of the wastewater is ...

Embodiment 3

[0049] A company’s oxalate method ethylene glycol production wastewater has a pH value of 1.0, a COD of 20,000 mg / L, and a TOC of 5,000 mg / L. 1,4-dioxane content 7000mg / L. Wastewater B / C was 0.014.

[0050] Carry out catalytic oxidation treatment to this waste water, the temperature control of catalytic oxidation reaction system is 99 ℃, pressure is normal pressure, pH is adjusted to 2.0 with alkali (sodium hydroxide solution or sodium carbonate solution or sodium bicarbonate solution), and total iron content is The amount of 400mg / L, 27.5% hydrogen peroxide is added according to 100ml per L of waste water (water from the stripping tower), and the reaction time is controlled to 90min.

[0051] Next, react for 30 minutes under the condition that the temperature of the wastewater is 99° C. and the pH of the wastewater is adjusted to 9.0 with NaOH solution.

[0052] Next, gravity sedimentation separation is carried out under the condition that the temperature of the wastewater ...

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PUM

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Abstract

The invention relates to a method for treating ethylene glycol production wastewater from an oxalate method. The method comprises that 1, the pH value of ethylene glycol production wastewater is adjusted to 2.0-4.5; 2, the obtained ethylene glycol production wastewater is subjected to high temperature catalytic oxidation treatment; 3, the pH value of the treated effluent is adjusted to 6-9, and the precipitation reaction of dissolved iron and the decomposition reaction of residual H2O2 in the water are performed; and 4, the product obtained in the step 3 is subjected to gravitational sedimentation separation or centrifugal separation, wherein the separated iron precipitate can be recycled, and the separated water can be further treated. According to the present invention, with the treatment method, the COD content, the TOC content and the 1,4-dioxane content in the wastewater can be effectively reduced, and the biodegradability of the wastewater can be significantly improved.

Description

technical field [0001] The invention relates to a method for treating organic chemical wastewater, in particular to a method for treating organic chemical wastewater that is difficult to biodegrade, in particular to a method for treating wastewater produced by oxalate method for producing ethylene glycol. Background technique [0002] Ethylene glycol is an important chemical raw material and strategic material. It is the most consumed polyol in the world. It can be used to make polyester (which can be further produced into polyester, beverage bottles, and films), explosives, glyoxal, and can be used as Antifreeze, plasticizers, hydraulic fluids and solvents, etc. [0003] Traditional ethylene glycol production completely relies on the petroleum ethylene route, which is costly. Coal-based ethylene glycol technology uses coal instead of petroleum ethylene to produce ethylene glycol. This kind of technical route is in line with the resource characteristics of our country, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/34
CPCC02F1/52C02F1/66C02F1/722C02F1/725C02F9/00C02F2101/34
Inventor 李海龙高凤霞栾金义程学文侯秀华莫馗万国晖张宾
Owner CHINA PETROLEUM & CHEM CORP
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