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Treatment method of low-concentration acetic acid wastewater containing inorganic metal ions and organic impurities

A low-concentration acetic acid and organic impurity technology, used in natural water treatment, chemical instruments and methods, heating water/sewage treatment, etc. The effect of reducing costs, reducing industrial costs, and simplifying the process

Inactive Publication Date: 2019-07-26
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method consumes huge energy by using ordinary evaporation crystallization
Concentration and evaporative crystallization directly after neutralization cannot effectively treat wastewater containing metal ions, and the obtained potassium acetate product cannot meet the market demand
[0008] In addition, the biochemical method mentioned in the patent CN207143053U and the adsorption method of the patent CN1354139A also have problems such as the unstable treatment system of the biochemical method, large equipment footprint, and large fluctuations in effluent quality.

Method used

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  • Treatment method of low-concentration acetic acid wastewater containing inorganic metal ions and organic impurities

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The composition of acetic acid wastewater: acetic acid mass fraction 5.5%, iron sulfate mass fraction 3.2%, zinc sulfate mass fraction 0.02%, magnesium sulfate mass fraction 0.02%, manganese sulfate mass fraction 0.04%, methanol mass fraction 0.2%, tert-butanol mass fraction 0.05%, the mass fraction of propanol is 0.05%, the mass fraction of methyl acetate is 0.1%, the mass fraction of propyl acetate is 0.03%, the mass fraction of tert-butyl acetate is 0.02%, the mass fraction of sulfuric acid is 2.7%, and the rest is moisture.

[0032] Add 2000kg of the above-mentioned acetic acid wastewater into the reactor, slowly add 147.9kg of calcium carbonate under stirring, stir at room temperature for 1 hour, the pH value of the wastewater rises to 6.5, then add 48kg of calcium oxide into the reactor, and continue stirring for 1 hour , forming a suspension containing hydroxide, calcium sulfate and calcium acetate.

[0033] Obtain filter cake (wet weight 232.4kg) after above-men...

Embodiment 2

[0036] The composition of acetic acid wastewater: 8.5% mass fraction of acetic acid, 3.9% mass fraction of iron sulfate, 0.02% mass fraction of zinc sulfate, 0.02% mass fraction of magnesium sulfate, 0.04% mass fraction of manganese sulfate, 0.2% mass fraction of methanol, 0.05% mass fraction of ethanol , 0.05% mass fraction of propanol, 0.1% mass fraction of ethyl acetate, 0.03% mass fraction of propyl acetate, 0.02% mass fraction of methyl acetate, 4.5% mass fraction of sulfuric acid, and the rest is moisture.

[0037] Add 10000kg of the above-mentioned acetic acid waste water in the reaction kettle, slowly add 1083.7kg of calcium carbonate under stirring state, stir at room temperature for 2 hours, the pH value of the waste water rises to 6.8, then add 174.9kg of calcium oxide in the reaction kettle, and continue to stir for 1.5 Hours, a suspension containing hydroxide, calcium sulfate and calcium acetate is formed.

[0038] After the above-mentioned suspension is filtered,...

Embodiment 3

[0041] The composition of acetic acid waste water: acetic acid mass fraction 7.5%, iron sulfate mass fraction 3.9%, zinc sulfate mass fraction 0.02%, magnesium sulfate mass fraction 0.02%, copper sulfate mass fraction 0.02%, manganese sulfate mass fraction 0.04%, methanol mass fraction 0.2 %, mass fraction of tert-butyl alcohol is 0.05%, mass fraction of propanol is 0.05%, mass fraction of methyl acetate is 0.1%, mass fraction of propyl acetate is 0.03%, mass fraction of tert-butyl acetate is 0.02%, mass fraction of sulfuric acid is 3.6%, and the rest for moisture.

[0042] Add 8000kg of the above-mentioned acetic acid wastewater in the reactor, slowly add 784.8kg of calcium carbonate under stirring, stir at room temperature for 1.5 hours, the pH value of the wastewater rises to 6.4, then add 103.9kg of calcium oxide in the reactor, and continue to stir for 1 Hours, a suspension containing hydroxide, calcium sulfate and calcium acetate is formed.

[0043] After filtering the ...

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Abstract

The invention discloses a treatment method of low-concentration acetic acid wastewater containing inorganic metal ions and organic impurities. The treatment method includes: subjecting the acetic acidwastewater to calcification treatment to convert acetic acid in the wastewater into calcium acetate, sulfate ions into calcium sulfate precipitate and metal ions into hydroxide precipitate; performing filtration to obtain a filter cake containing calcium sulfate and hydroxide as well as calcium acetate aqueous solution; subjecting the calcium acetate aqueous solution to MVR treatment to obtain acalcium acetate suspension, filtering the calcium acetate suspension to obtain the filtrate and the filter cake containing the calcium acetate, performing crystallization drying on the filtrate to obtain the calcium acetate, combining the calcium acetate with the filter cake containing the calcium acetate to obtain a calcium acetate solid, performing hydrolysis on the calcium acetate solid to obtain ethylic acid and calcium sulfate, and performing thermal analysis on calcium sulfate and / or the filter cake containing calcium sulfate and hydroxide; performing deep purification on the gas containing organic steam, produced by thermal analysis, the steam containing organic matter, produced by MVR treatment and the steam produced by crystallization and drying are all introduced into an oxygen cracking unit; the purification and resource treatment of the acetic acid wastewater is realized.

Description

technical field [0001] The invention belongs to the field of industrial acetic acid wastewater treatment and relates to a treatment method for low-concentration acetic acid wastewater containing inorganic metal ions and organic impurities. Background technique [0002] In the production process of acetate, due to the use of acetic acid and alcohol for the reaction of sulfuric acid catalyzed esterification, low-concentration acetic acid wastewater will inevitably be produced, and the COD value of the wastewater is as high as tens of thousands to hundreds of thousands of mgO 2 / L. At the same time, because acetic acid wastewater contains sulfuric acid, it is corrosive to the storage container, resulting in a small amount of metal sulfate dissolved in acetic acid wastewater. Such wastewater is hazardous waste, which increases the difficulty of purification of acetic acid wastewater. [0003] In the industry, direct incineration or neutralization is generally used to treat stro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01F11/46C07C51/42C07C53/08C02F103/36
CPCC02F9/00C01F11/46C07C51/42C02F1/04C02F1/02C02F2103/36C07C53/08
Inventor 乔旭刘清李欢欢崔咪芬陈献费兆阳汤吉海张竹修
Owner NANJING UNIV OF TECH
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