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Treatment method of sodium isobutyrate wastewater

A sodium isobutyrate and treatment method technology, applied in water/sewage treatment, neutralized water/sewage treatment, multi-stage water/sewage treatment, etc., can solve problems such as unspecified wastewater, difficult to treat, and unspecified wastewater

Active Publication Date: 2020-09-22
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The production of non-water-soluble green film-forming aid alcohol ester twelve (chemical name: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate) uses isobutyraldehyde as raw material, in the reaction Afterwards, a large amount of sodium isobutyrate wastewater will be produced, and there is a small amount of isobutyraldehyde and alcohol ester twelve in the wastewater, which is difficult to treat by conventional biochemical methods
[0003] Chinese patent CN105016415A uses dilute hydrochloric acid or dilute sulfuric acid to convert lithium organic acid into carboxylic acid, and then extracts the organic acid with cyclohexane. Since this patent uses cyclohexane as the extraction agent, it needs to be recovered and then recycled. , and did not give how to treat the acidified wastewater
Chinese patent CN105646212A adopts haloalkane esterification method to treat isobutyrate wastewater. In the presence of acid-binding agent, haloalkane reacts with isobutyrate to form isobutyrate. This method requires pressurized reaction under acidic conditions. The material requirements are high, and it does not explain how to treat the wastewater after esterification

Method used

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  • Treatment method of sodium isobutyrate wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The mass fraction of sodium isobutyrate in the sodium isobutyrate wastewater to be treated is 30%, the organic matter other than sodium isobutyrate is 3%, and the rest is water.

[0032] like figure 1 , add 150kg vitriol oil (mass fraction is 98%) in 1000kg sodium isobutyrate waste water, make the pH value of waste water reach 2, carry out phase-separation operation after acidification, obtain oil phase 270kg and water phase, isobutyric acid in oil phase 228kg, 15kg of organic matter except isobutyric acid, and 27kg of water; the mass fraction of total organic matter (containing isobutyric acid and organic matter except isobutyric acid) in the aqueous phase is about 3.4%, and the mass fraction of sodium sulfate is 22%.

[0033] The adsorption system is composed of 5 stages of adsorption columns connected in series, with 150kg of activated carbon (average particle size of 25 mesh) as the adsorbent, and each stage of adsorption column is filled with 30kg of activated carb...

Embodiment 2

[0036] The mass fraction of sodium isobutyrate in the sodium isobutyrate wastewater to be treated is 23%, the organic matter other than sodium isobutyrate is 1.2%, and the rest is water.

[0037] Add 116kg concentrated sulfuric acid (mass fraction is 98%) in 1000kg sodium isobutyrate waste water and carry out acidification, make the pH value of waste water reach 3, carry out phase separation operation after acidification, phase separation obtains oil phase 202.6kg and water phase, oil phase 176.3kg of isobutyric acid in medium, 6kg of organic matter except isobutyric acid, 20.3kg of water; The mass fraction is 16.4%.

[0038] Three stages of adsorption columns are connected in series to form an adsorption system, and 80.2kg of ZSM-5 mesoporous molecular sieve (average particle size is 50 mesh) is used as the adsorbent, and the ZSM-5 mesoporous molecular sieve is evenly distributed and loaded in each stage of adsorption column. At 30°C, the water phase has a liquid space veloc...

Embodiment 3

[0041] The mass fraction of sodium isobutyrate in the sodium isobutyrate wastewater to be treated is 10%, the organic matter other than sodium isobutyrate is 1%, and the rest is water.

[0042] Add 50kg vitriol oil (mass fraction is 98%) in 1000kg sodium isobutyrate waste water and carry out acidification, make the pH value of waste water reach 3, carry out phase separation operation after acidification, phase separation obtains oil phase 90kg and water phase, in oil phase 76kg of isobutyric acid, 5kg of organic matter except isobutyric acid, 9kg of water; the mass fraction of total organic matter (containing isobutyric acid, organic matter except isobutyric acid) in the aqueous phase is about 0.42%, and the mass fraction of sodium sulfate is 6.7%.

[0043] Three stages of adsorption columns are connected in series to form an adsorption system, and 50kg D001 macroporous resin (average particle size is 5 mesh) is used as the adsorbent, and the macroporous resin is evenly distri...

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Abstract

The invention discloses a method for treating sodium isobutyrate wastewater, which comprises the following steps: acidifying sodium isobutyrate wastewater by using concentrated sulfuric acid, layeringafter acdification, and carrying out phase splitting to obtain an oil phase and a sodium sulfate-containing water phase; introducing the sodium sulfate-containing water phase into an adsorption system in which multiple stages of adsorption columns are connected in series, and adsorbing by using an adsorbent to reduce the COD in the water phase to be less than or equal to 40 mg / L; desorbing and regenerating the adsorbent by using a sodium hydroxide solution so that isobutyric acid adsorbed by the adsorbent and sodium hydroxide form a sodium isobutyrate aqueous solution; acidifying the sodium isobutyrate aqueous solution by using concentrated sulfuric acid; carrying out phase splitting to obtain a water phase and an oil phase containing isobutyric acid; and returning the water phase to themultistage adsorption columns, sequentially carrying out adsorption, desorption regeneration, acidification and phase separation treatment, carrying out circulation treatment until a sodium sulfate crystal is separated out of the water phase, carrying out solid-liquid separation, and carrying out solid-phase method oxygen cracking treatment on the sodium sulfate crystals under the action of a catalyst to obtain a sodium sulfate product with TOC content of less than 10 mg / kg. The total recovery rate of isobutyric acid reaches 99% or above.

Description

technical field [0001] The invention belongs to the field of treatment of alcohol ester twelve production wastewater in chemical wastewater treatment, and in particular relates to a comprehensive treatment method for sodium isobutyrate wastewater. Background technique [0002] The production of non-water-soluble green film-forming aid alcohol ester twelve (chemical name: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate) uses isobutyraldehyde as raw material, in the reaction Afterwards, a large amount of sodium isobutyrate wastewater will be produced, and there will be a small amount of isobutyraldehyde and alcohol ester twelve in the wastewater, which is difficult to handle by conventional biochemical methods. [0003] Chinese patent CN105016415A uses dilute hydrochloric acid or dilute sulfuric acid to convert organic acid lithium into carboxylic acid, and then extracts the organic acid with cyclohexane. Since this patent uses cyclohexane as the extraction agent, it needs to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01D5/16C02F101/30
CPCC02F9/00C01D5/16C01P2006/80C02F1/281C02F1/283C02F1/285C02F1/66C02F1/40C02F2101/30C02F2303/16
Inventor 乔旭陈献崔咪芬费兆阳刘清汤吉海张竹修
Owner NANJING UNIV OF TECH