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A method for treating waste water containing acrylic acid and recycling it

An acrylic and resource-based technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Low cost and the effect of resource utilization

Active Publication Date: 2017-07-14
POTEN ENVIRONMENT GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention discloses a method for treating waste water containing acrylic acid and recycling it, which is used to solve the problems of high energy consumption and high operating costs in the treatment of waste water containing acrylic acid in the prior art. The scheme is as follows:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Take 1000ml of wastewater containing acrylic acid, the content of acrylic acid in the wastewater is 33354mg / L, the content of formaldehyde is 15000mg / L, and the content of acetic acid is 35600mg / L; COD Cr Value 108320mg / L;

[0049] First use sulfuric acid to adjust the pH value of the wastewater to 1, then heat the wastewater to boiling for atmospheric distillation, and condense to collect fractions; when the volume of the distillation residue reaches 5% of the volume of the original wastewater containing acrylic acid, stop the distillation; Add 36g of urea, heat to 30°C and react for 6h, white solid appears at the bottom, indicating the formation of urea-formaldehyde resin, after filtering to obtain the first filtrate, measure its formaldehyde content to 1507mg / L, then add sodium bisulfite 1.4 to the first filtrate g, react at 20° C. for 30 minutes to remove the remaining formaldehyde, and filter to obtain the second filtrate; use an extraction agent consisting of 20 v...

Embodiment 2

[0053] Take 1000ml of wastewater containing acrylic acid, the content of acrylic acid in the wastewater is 33354mg / L, the content of formaldehyde is 15000mg / L, and the content of acetic acid is 35600mg / L; COD Cr Value 108320mg / L;

[0054] First use sulfuric acid to adjust the pH value of the waste water to 3, then heat the waste water to boiling for distillation, and condense to collect fractions; when the volume of the distillation residue reaches 10% of the volume of the original waste water containing acrylic acid, stop the distillation; add 50g Urea, heated to 40°C and reacted for 4 hours, a white solid appeared at the bottom, indicating the formation of urea-formaldehyde resin. After filtering to obtain the first filtrate, add 0.9 g of sodium bisulfite to the first filtrate, and react at 30°C for 20 minutes to remove Remaining formaldehyde, filter to obtain the second filtrate; Use the extraction agent that is made up of 30 volume % ethyl acetate and 70 volume % toluene t...

Embodiment 3

[0058] Take 1000ml of wastewater containing acrylic acid, the content of acrylic acid in the wastewater is 33354mg / L, the content of formaldehyde is 15000mg / L, and the content of acetic acid is 35600mg / L; COD Cr Value 108320mg / L;

[0059] First use sulfuric acid to adjust the pH value of the waste water to 5, then heat the waste water to boiling for distillation, and condense to collect fractions; when the volume of the distillation residue reaches 12% of the volume of the original waste water containing acrylic acid, stop the distillation; add 90g Urea, heated to 50°C and reacted for 2 hours, a white solid appeared at the bottom, indicating the formation of urea-formaldehyde resin. After filtering to obtain the first filtrate, add 1.5 g of sodium bisulfite to the first filtrate, and react at 50°C for 15 minutes to remove The remaining formaldehyde is filtered to obtain the second filtrate; the acetic acid in the second filtrate is extracted and recovered by using an extractan...

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PUM

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Abstract

The embodiment of the present invention discloses a method for treating acrylic acid-containing wastewater and recycling it. The method includes: adjusting the pH value of acrylic acid-containing wastewater to 1-5, distilling it, and collecting fractions. When the volume of the distillation residue is When the volume of the waste water containing acrylic acid reaches 5-20%, the distillation is stopped; urea is added to the fraction, and the reaction is carried out at 20-50° C. for 1-24 hours. After the reaction is completed, the first filtration treatment is carried out to obtain the first One filtrate; adding sodium bisulfite to the first filtrate, reacting at 20-50°C for 5-30 minutes, after the reaction is completed, perform a second filtration treatment to obtain the second filtrate, and extract the second filtrate with an extractant The acetic acid in the extract phase and the raffinate are obtained; the acetic acid in the extract phase is recovered; the distillation residue is dried, glued and solidified with a water-soluble phenolic resin, and activated by alkali to prepare a heavy metal adsorption resin.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for treating waste water containing acrylic acid and recycling it. Background technique [0002] Acrylic acid is an important organic chemical raw material, and corresponding acrylic acid-containing wastewater is produced in its production process. Pollutants in wastewater containing acrylic acid are mainly formaldehyde, acetic acid, acrylic acid, etc. [0003] At present, the treatment of wastewater containing acrylic acid mainly adopts direct incineration method and wet catalytic oxidation method. In the direct incineration method, after the wastewater containing acrylic acid is neutralized with sodium hydroxide, it is heated into the distillation tower and concentrated by steam heating, and part of the process water is recovered, and the distillation residue is sent to the incinerator for incineration. The cooled water after incineration can reach Tier 1 emission sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F9/14B01J20/26C02F101/34
Inventor 乔瑞平刘峰李海涛张伦梁蒋玮
Owner POTEN ENVIRONMENT GRP