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

A low-concentration acetic acid, metal ion technology, applied in natural water treatment, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as inability to effectively treat wastewater, consumption, and inability to meet demand for potassium acetate products, and achieve purification. The effect of resource processing and cost reduction

Inactive Publication Date: 2019-07-23
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 uses common evaporative crystallization to consume huge energy, and the method of directly concentrating and evaporatively crystallizing potassium acetate after neutralization cannot effectively treat waste water containing metal ions, and the obtained potassium acetate product cannot meet the demand of the market

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Acetic acid wastewater composition: 9.5% mass fraction of acetic acid, 4.4% mass fraction of iron sulfate, 0.05% mass fraction of chromium sulfate, 0.42% mass fraction of nickel sulfate, 0.2% mass fraction of ethanol, 0.15% mass fraction of tert-butanol, mass fraction of ethyl acetate 0.1%, the mass fraction of tert-butyl acetate is 0.05%, the mass fraction of sulfuric acid is 3.1%, and the rest is moisture.

[0030] Add 2000kg of the above-mentioned acetic acid wastewater into the reactor, slowly add 222.9kg of calcium carbonate under stirring, stir at room temperature for 1 hour for calcification treatment, then add 40.4kg of calcium oxide into the reactor, and continue stirring for 1 hour to form Suspensions of substance, calcium sulfate and calcium acetate.

[0031] The above-mentioned suspension is filtered to obtain a filter cake (wet weight 262.5kg). The filter cake is subjected to thermal analysis at 400° C. for 3 hours. After thermal analysis, a solid mixture o...

Embodiment 2

[0035] The composition of acetic acid wastewater: 8.5% mass fraction of acetic acid, 3.9% mass fraction of iron sulfate, 0.08% mass fraction of chromium sulfate, 0.37% mass fraction of nickel sulfate, 0.07% mass fraction of magnesium sulfate, 0.2% mass fraction of ethanol, and mass fraction of n-butanol 0.07%, the mass fraction of ethyl acetate is 0.1%, the mass fraction of n-butyl acetate is 0.05%, the mass fraction of sulfuric acid is 4.5%, and the rest is moisture.

[0036] Add 10000kg of the above-mentioned acetic acid wastewater into the reactor, slowly add 1081.3kg of calcium carbonate under stirring, stir at room temperature for 2 hours, then add 178.4kg of calcium oxide into the reactor, and continue stirring for 1.5 hours to form Suspension of calcium and calcium acetate.

[0037] The above-mentioned suspension is filtered to obtain a filter cake (wet weight 1485.5kg), and the filter cake is subjected to thermal analysis at 400°C for 3 hours to obtain a solid mixture ...

Embodiment 3

[0041] The composition of acetic acid wastewater: acetic acid mass fraction 5.5%, iron sulfate mass fraction 2.7%, chromium sulfate mass fraction 0.01%, nickel sulfate mass fraction 0.57%, manganese sulfate mass fraction 0.04%, ethanol mass fraction 0.1%, tert-butanol mass fraction 0.18%, the mass fraction of ethyl acetate is 0.1%, the mass fraction of tert-butyl acetate is 0.09%, the mass fraction of sulfuric acid is 3.6%, and the rest is moisture.

[0042] Add 8000kg of the above-mentioned acetic acid wastewater into the reactor, slowly add 642.5kg of calcium carbonate under stirring, then stir at room temperature for 1.5 hours, then add 105.4kg of calcium oxide into the reactor, and continue stirring for 1 hour to form , calcium sulfate and calcium acetate suspension.

[0043] Obtain filter cake (wet weight 875.2kg) after above-mentioned mixed solution is filtered, filter cake is carried out thermal analysis at 400 ℃ for 3 hours, the solid mixture of the metal oxide and cal...

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Abstract

The invention discloses a treatment method for low-concentration acetic acid wastewater containing metal ions and organic impurities. The treatment method comprises the following steps: calcifying thewastewater, turning acetic acid in the wastewater into calcium acetate, turning sulfate radicals into calcium sulfate precipitation, and meanwhile, turning metal ions in the wastewater into hydroxideprecipitation; filtering the wastewater, thereby acquiring a filter cake containing calcium sulfate and hydroxide and a calcium acetate aqueous solution; performing MVR treatment on the calcium acetate aqueous solution, thereby acquiring a super-saturated calcium acetate solution; filtering the super-saturated calcium acetate solution, thereby acquiring a calcium acetate-containing filter cake and a filtrate; crystalizing and drying the filtrate, thereby acquiring calcium acetate; mixing calcium acetate with the calcium acetate-containing filter cake, thereby acquiring a calcium acetate solid; thermally cracking the calcium acetate solid, thereby generating acetone and calcium carbonate; thermally desorbing the filter cake containing calcium sulfate and hydroxide; further purifying an organic vapor-containing gas generated from thermal desorption, the water vapor containing organic matters generated from MVR treatment and the water vapor generated by crystalizing and drying. Accordingto the method provided by the invention, resource utilization and purification of acetic acid wastewater can be realized.

Description

technical field [0001] The invention belongs to the field of industrial acetic acid wastewater treatment, and relates to a method for purifying and recycling low-concentration acetic acid wastewater containing 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 the acetic acid wastewater contains sulfuric acid, there is a certain corrosion to the storage container, resulting in a small amount of metal sulfate dissolved in the acetic acid wastewater. This type of wastewater is hazardous waste, which increases the difficulty of purification treatment of acetic acid wastewater. [0003] In the industry, direct incineration or n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01F11/46C07C45/54C07C49/08C02F103/36
CPCC02F9/00C01F11/46C07C45/54C02F1/04C02F1/02C02F2103/36C07C49/08
Inventor 乔旭刘清叶家骅陈献崔咪芬费兆阳汤吉海张竹修
Owner NANJING UNIV OF TECH