Method for extracting and separating dimethylformamide in wastewater by adopting eutectic solvent

A technology of dimethylformamide and low eutectic solvent is applied in the field of chemical waste solvent treatment and recovery, which can solve the problems of large pollution, high toxicity and easy volatility of extractants, and achieves simple and easy process operation, low toxicity, and reduced The effect of pollution

Pending Publication Date: 2022-05-27
QUZHOU RES INST OF ZHEJIANG UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of large pollution, high volatility and high toxicity of existing extractants, the purpose of the present invention is to propose a method for extracting and separating dimethylformamide in waste water using deep eutectic solvents

Method used

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  • Method for extracting and separating dimethylformamide in wastewater by adopting eutectic solvent
  • Method for extracting and separating dimethylformamide in wastewater by adopting eutectic solvent

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The flow chart of the present invention is as follows figure 1 shown.

[0028] Prepare 10 g of a deep eutectic solvent containing 70% by mass of caprylic acid and 30% by mass of lauric acid, and prepare 10 g of simulated wastewater containing 30% by mass of dimethylformamide, mix the two phases and perform shaking extraction at 30 °C 2h, after the extraction, the layers were separated by standing. Take the organic phase and the aqueous phase to detect the concentration of dimethylformamide, the results show that the distribution coefficient of dimethylformamide is 0.571, and the selectivity coefficient is 11.6.

[0029] The organic phase after extraction was placed in a rotary evaporator, distilled at 120° C. and a vacuum of 97 kPa for 2 h, and fractions were collected under this condition. The DMF content in the fraction separated by vacuum distillation is 87wt%, and the rest is composed of 13wt% caprylic acid and a trace amount of lauric acid. The fractions collect...

Embodiment 2

[0031] Prepare 10 g of a deep eutectic solvent containing 90% by mass of caprylic acid and 10% by mass of lauric acid, and prepare 10 g of simulated wastewater containing 20% ​​by mass of dimethylformamide. Mix the two phases and perform shaking extraction at 30 °C. 2h, after the extraction, the layers were separated by standing. The organic phase and the aqueous phase were taken to detect the concentration of dimethylformamide. The results showed that the distribution coefficient of dimethylformamide was 0.627 and the selectivity coefficient was 9.8.

[0032] The organic phase after extraction was placed in a rotary evaporator, distilled at 120° C. and a vacuum of 97 kPa for 2 h, and fractions were collected under this condition. The DMF content in the fraction separated by vacuum distillation is 85wt%, and the rest is composed of 15wt% caprylic acid and a trace amount of lauric acid. The fractions collected by the first vacuum distillation were placed in a rotary evaporator...

Embodiment 3

[0034] Prepare 10 g of a deep eutectic solvent containing 70% by mass of caprylic acid and 30% by mass of lauric acid, select 10 g of simulated wastewater containing 20% ​​by mass of dimethylformamide, mix the two phases and perform shaking extraction at 15 °C 2h, after the extraction, the layers were separated by standing. The organic phase and the aqueous phase were taken to detect the concentration of dimethylformamide. The results showed that the distribution coefficient of dimethylformamide was 0.521, and the selectivity coefficient was 10.5.

[0035] The organic phase after extraction was placed in a rotary evaporator, distilled at 120° C. and a vacuum of 97 kPa for 2 h, and fractions were collected under this condition. The DMF content in the fraction separated by vacuum distillation is 85wt%, and the rest is composed of 15wt% caprylic acid and a trace amount of lauric acid. The fractions collected by the first vacuum distillation were placed in a rotary evaporator, an...

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Abstract

The invention discloses a method for extracting and separating dimethylformamide in wastewater by adopting a deep eutectic solvent. The method comprises the following steps: (1) mixing octanoic acid and lauric acid, heating, and cooling to room temperature to obtain a uniform and transparent clear liquid, namely a eutectic solvent, which is used as an organic phase; the method comprises the following steps: by taking waste water containing dimethylformamide as a water phase, oscillating the organic phase and the water phase according to a certain mass ratio at a certain temperature, and standing to separate the water phase and the organic phase after balance is achieved, so that dimethylformamide is enriched in the organic phase; (2) putting an organic phase after extraction into a rotary evaporator, distilling, and collecting fractions; and putting the fraction collected by the first reduced pressure distillation into a rotary evaporator, distilling again, and collecting the fraction collected by the second reduced pressure distillation. The method is simple and easy to implement, and the provided extraction agent is easy to recover, small in environmental pollution, low in energy consumption and suitable for industrial application.

Description

technical field [0001] The invention belongs to the field of chemical waste solvent treatment and recovery, and in particular relates to a method for separating and recovering dimethylformamide with a selected low eutectic solvent as an extractant and extraction-rectification as a core. Background technique [0002] Dimethylformamide is a commonly used organic solvent with a molecular structure of HCON (CH 3 ) 2 , the boiling point is 153 ° C, its solubility is good, and it can be miscible with a variety of organic solvents. It has a wide range of applications in leather, pharmaceutical, organic synthesis, petrochemical and other industries. In the synthetic leather industry, dimethylformamide is mainly used as a solvent, and a large amount of waste water containing dimethylformamide will be produced in the production, and the mass concentration of these waste water is between 1 and 30%. If these wastewaters are directly discharged, they will pollute the environment and ca...

Claims

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Application Information

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IPC IPC(8): C07C233/03C07C231/24C02F1/26C02F101/38C02F101/34C02F103/36
CPCC07C231/24C02F1/26C02F2101/38C02F2101/34C02F2103/36C07C233/03Y02W10/37
Inventor 李伟聪何潮洪沈剑吴可君
Owner QUZHOU RES INST OF ZHEJIANG UNIV
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