Recycling and purifying treatment method of sodium ethoxypropionate-containing wastewater

A technology of sodium ethoxypropionate and purification treatment, which is applied in the directions of oxidized water/sewage treatment, water/sewage treatment, natural water treatment, etc., can solve the problems of unstable membrane performance, difficulty in meeting discharge standards, cumbersome processes, etc. To achieve the effect of resource reuse and purification treatment

Active Publication Date: 2017-08-04
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrodialysis does have many applications in the treatment of wastewater containing organic salts, but this type of method can only deal with low-salt concentration wastewater, and requires multi-step pretreatment of wastewater, and the low-concentration brine after treatment is difficult to meet the discharge standards. It still needs to be combined with other wastewater treatment processes (such as biochemical methods, oxidation methods, etc.) to meet the discharge standards, and the process is cumbersome
Moreover, the instability of the membrane performance, the short life of the membrane, and the need for frequent cleaning to restore the membrane flux are all problems in the industrial application of electrodialysis.

Method used

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  • Recycling and purifying treatment method of sodium ethoxypropionate-containing wastewater
  • Recycling and purifying treatment method of sodium ethoxypropionate-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The concentration of EEP in the wastewater containing sodium ethoxy propionate produced during the EEP production process is 5 wt%, the concentration of ethanol is 20 wt%, the concentration of 3-ethoxy sodium propionate is 10 wt%, and the rest is water. The above-mentioned waste water containing ethoxypropionate sodium salt is used as a resource and purified, and the steps are as follows:

[0038] Acidification and salting out: Take 1000g of the above process wastewater as a raw material and place it in an acidification and salting out kettle. After adjusting the pH of the wastewater to 3 with 35.7g of concentrated sulfuric acid (concentration 98wt%), add 400g of anhydrous sodium sulfate to stir and salt out. After stirring for 15 minutes, stand still and separate the phases to obtain 1100.7g of the first salt-containing phase and 328.9g of oil phase. In the oil phase, there is 50g of EEP, 194.6g of ethanol, and 84.3g of ethoxypropionic acid.

[0039] Salt-out esterific...

Embodiment 2

[0043] The concentration of EEP in the wastewater containing sodium ethoxypropionate produced during the production of EEP is 2wt%, the concentration of ethanol is 22wt%, the concentration of 3-ethoxysodium propionate is 13wt%, and the rest is water. The above-mentioned waste water containing ethoxypropionate sodium salt is used as a resource and purified, and the steps are as follows:

[0044] Acidification and salting-out: take 1000g of the above-mentioned wastewater process wastewater as a raw material and place it in an acidification and salting-out kettle, after adjusting the pH to 2 with 46.4g of concentrated sulfuric acid (concentration 98wt%), add 450g of anhydrous sodium sulfate to stir and salt-out, at 40°C After stirring for 15 minutes, stand still and separate the phases to obtain 955.9 g of the first salt-containing phase and 342.7 g of oil phase. In the oil phase, there are 20 g of EEP, 213.1 g of ethanol, and 109.6 g of ethoxypropionic acid.

[0045] Salting out...

Embodiment 3

[0049] In the wastewater containing sodium ethoxypropionate produced during the production of EEP, the concentration of EEP is 3wt%, the concentration of ethanol is 23wt%, the concentration of 3-ethoxysodium propionate is 11wt%, and the rest is water. The above-mentioned waste water containing ethoxypropionate sodium salt is used as a resource and purified, and the steps are as follows:

[0050] Acidification and salting out: Take 1000g of the above-mentioned process wastewater as a raw material and place it in an acidification and salting out kettle, adjust the pH to 3 with 39.3g of concentrated sulfuric acid (98wt%), add 280g of anhydrous sodium sulfate to stir and salt out, and stir at 50°C for 15min After standing still, the phases were separated to obtain 965.8g of the first salt-containing phase and 343.1g of the oil phase. In the oil phase, there was 30g of EEP, 220.4g of ethanol, and 92.7g of ethoxypropionic acid.

[0051] Salting out, esterification, and phase separat...

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Abstract

The invention discloses a recycling and purifying treatment method of sodium ethoxypropionate-containing wastewater. The method comprises: carrying out acidification salting-out on sodium ethoxypropionate wastewater, and carrying out phase separation to obtain an oil phase and a first salt-containing water phase; esterifying the oil phase to produce an esterification reaction solution containing EEP and water, carrying out phase separation to obtain a second salt-containing water phase and crude EPP, mixing the second salt-containing water phase with the sodium ethoxypropionate-containing wastewater, and carrying out acidification salting-out; and evaporating the first salt-containing water phase to make water steam containing organic matters enter a fixed bed reactor and undergo an adiabatic catalytic oxidation reaction, condensing obtained oxidized mixed gas, discharging obtained condensate, and directly discharging obtained non-condensable gas to air. The invention realizes the recycling of the sodium ethoxypropionate in the EEP production wastewater and realizes the purifying treatment of the wastewater.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of chemical waste and the technical field of wastewater treatment, and in particular relates to a resource utilization and purification treatment method for wastewater containing 3-ethoxypropionic acid sodium salt. Background technique [0002] 3-Ethoxy ethyl propionate (EEP) is an important chemical intermediate with broad market prospects. At present, the main process is to synthesize acrylate and ethanol as raw materials under the condition of alkali metal alkoxide as a catalyst, and the reaction equation is as follows: [0003] [0004] After the reaction, the catalyst needs to be neutralized and destroyed, and ethoxypropionate wastewater will be produced in the process. [0005] At present, most of the treatment methods for organic acid salts use the acidification method, that is, acidification of organic acid salts with strong acid to convert them into organic acids and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C07C67/31C07C69/708C02F103/36C02F101/34
CPCC02F1/04C02F1/66C02F1/725C02F1/74C02F9/00C02F2101/34C02F2103/36C07C67/31C07C69/708
Inventor 乔旭陈献孙彬费兆阳刘清崔咪芬汤吉海张竹修
Owner NANJING UNIV OF TECH
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