Ethylene glycol production wastewater treatment method

A technology for producing wastewater and treatment methods, applied in water/sewage treatment, natural water treatment, heating water/sewage treatment, etc., to achieve the effects of reducing pressure, cost and investment, and reducing the amount of oxidant and reaction time

Inactive Publication Date: 2017-11-03
CHINA PETROLEUM & CHEM CORP +1
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, there is no relevant specific report on the treatment method of the high-concentration production wastewater produced by the oxalate method to produce ethylene glycol.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ethylene glycol production wastewater treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A company’s oxalate method ethylene glycol production wastewater has a pH value of 2.0, a COD of 14000 mg / L, and a TOC of 4000 mg / L. 1,4-dioxane content 5000mg / L. The total nitrogen content is 2000mg / L.

[0051] Under the conditions that the temperature of the stripper tower kettle is controlled at 108°C, the pressure at the top of the stripper tower is controlled at normal pressure, the number of theoretical plates of the stripper tower is 15, and the outflow of the tower top of the stripper tower is 12% of the water entering the tower, The content of dioxane in the effluent water of the stripping tower drops to less than 120mg / L.

[0052] Next, high-temperature catalytic oxidation treatment is carried out on the wastewater. The temperature of the catalytic oxidation reaction system is controlled at 90°C, the pressure is normal pressure, the pH is adjusted to 3.0 with alkali, the total iron content is 100 mg / L, and the amount of 27.5% hydrogen peroxide is calculated a...

Embodiment 2

[0057] A company's coal-based ethylene glycol production wastewater has a pH value of 9.0, a COD of 20,000 mg / L, and a TOC of 6,000 mg / L. The content of 1,4-dioxane is 7000mg / L, and the content of total nitrogen is 3000mg / L.

[0058] Under the conditions that the temperature of the stripper tower kettle is controlled at 102°C, the pressure at the top of the stripper tower is controlled at normal pressure, the number of theoretical plates of the stripper tower is 10, and the outflow of the tower top of the stripper tower is 10% of the water entering the tower, The content of dioxane in the effluent water of the stripping tower drops to less than 200mg / L.

[0059] 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 be 4.5 with sulfuric acid, the consumption of total iron content is 50mg / L, 27.5% hydrogen peroxide by every L waste water (steam Add 10ml ...

Embodiment 3

[0064] A company's coal-based ethylene glycol production wastewater has a pH value of 9.0, a COD of 10,000 mg / L, and a TOC of 3,000 mg / L. The content of 1,4-dioxane is 2000mg / L, and the content of total nitrogen is 1500mg / L.

[0065] Under the conditions that the temperature of the stripper tower is controlled at 120°C, the pressure at the top of the stripper is controlled at normal pressure, the number of theoretical plates of the stripper is 20, and the outflow of the top of the stripper is 20% of the water entering the tower, The content of dioxane in the effluent water of the stripping tower drops to less than 80mg / L.

[0066] This waste water is carried out catalytic oxidation treatment, and the temperature control of catalytic oxidation reaction system is 99 ℃, and pressure is normal pressure, and pH is adjusted to 2.0 with sulfuric acid, and total iron content is 200mg / L, the consumption of 27.5% hydrogen peroxide by every L waste water (steam Add 5ml of water from the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to an ethylene glycol production wastewater treatment method, which comprises that 1, ethylene glycol production wastewater from an oxalate method is subjected to indirect heat exchange heating sequentially with the effluent from the kettle of a steam stripping tower and the steam from the top of the steam stripping tower, and the heated material enters the steam stripping tower and is subjected to steam stripping treatment; 2, the pH value of the effluent of the steam stripping tower is adjusted to 2.0-4.5, and the obtained effluent is subjected to high temperature catalytic oxidation treatment; 3, the treated effluent enters a precipitation reactor, the pH value of the precipitation reactor is adjusted to 6-9, and the precipitation reaction of dissolved iron and the decomposition of residual hydrogen peroxide in the water are performed; and 4, the precipitate mixture obtained in the step 3 is subjected to gravitational sedimentation separation or centrifugal separation, wherein the separated iron precipitate can completely return to the step 2 so as to be recycled. According to the present invention, with the treatment method, the 1,4-dioxane content in the wastewater can be reduced to below 1 mg / L, the COD can be reduced below 80 mg / L, and the TOC can be reduced to below 40 mg / L.

Description

technical field [0001] The invention relates to a treatment method for organic chemical wastewater, in particular to a treatment method for refractory organic chemical wastewater. In particular, it refers to a method for treating waste water produced by oxalate ester method to produce 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. 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, which is short ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/36C02F101/34
CPCC02F1/04C02F1/38C02F1/52C02F1/722C02F1/725C02F9/00C02F2101/34C02F2103/36
Inventor 程学文李海龙高凤霞栾金义侯秀华莫馗王珺卢姝
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap