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Separation of N,N-dimethylacetamide-acetic acid mixed system

A technology of dimethylacetamide and acetic acid, which is applied in the separation/purification of carboxylic acid compounds, separation/purification of carboxylic acid amides, organic chemistry, etc., can solve the problem of waste of acetic acid resources, and achieve high operating flexibility and simple process Effect

Active Publication Date: 2021-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can recycle and obtain N,N-dimethylacetamide, it will cause waste of acetic acid resources

Method used

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  • Separation of N,N-dimethylacetamide-acetic acid mixed system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] There is a mixture of N,N-dimethylacetamide and acetic acid, the mass ratio is 50:50, chloroform is used as the hydrophobic phase, and water is used as the hydrophilic phase. Two-phase multi-stage countercurrent extraction is carried out. The total number of extraction stages is 12. , where the mixture enters from the 6th stage position counting from the hydrophobic phase feed port. The mass flow rate of the treated mixture is 0.2 times the mass flow rate of the total extractant (including the hydrophobic phase and the hydrophilic phase), wherein the mass ratio of the hydrophobic phase to the hydrophilic phase is 1. The extraction was carried out at 25° C. to obtain an extract phase and a raffinate phase, respectively. The raffinate phase enters the raffinate phase rectification tower, the operating pressure is 0.5atm, the reflux ratio is 0.5, the temperature of the tower bottom is controlled at 96°C, and finally the acetic acid product is obtained in the tower bottom. ...

Embodiment 2

[0038] There is a batch of mixture of N,N-dimethylacetamide and acetic acid, the mass ratio is 30:70, with eugenol as the hydrophobic phase and water as the hydrophilic phase, a two-phase multi-stage countercurrent extraction is carried out, and the total number of extraction stages is 12 stage, where the mixture enters from the 4th stage position counted from the hydrophobic phase feed port. The mass flow rate of the treated mixture is 0.2 times the mass flow rate of the total extractant (including the hydrophobic phase and the hydrophilic phase), wherein the mass ratio of the hydrophobic phase to the hydrophilic phase is 0.5. The extraction was carried out at 25° C. to obtain an extract phase and a raffinate phase, respectively. The raffinate phase enters the raffinate phase rectification tower, the operating pressure is 0.5atm, the reflux ratio is 1, the temperature of the tower bottom is controlled at 96°C, and finally the acetic acid product is obtained in the tower botto...

Embodiment 3

[0040] There is a mixture of N,N-dimethylacetamide and acetic acid, the mass ratio is 20:80, with aniline as the hydrophobic phase and water as the hydrophilic phase, a two-phase multi-stage countercurrent extraction is performed, and the total number of extraction stages is 12 , where the mixture enters from the third stage position counting from the hydrophobic phase feed port. The mass flow rate of the treated mixture is 0.2 times the mass flow rate of the total extractant (including the hydrophobic phase and the hydrophilic phase), wherein the mass ratio of the hydrophobic phase to the hydrophilic phase is 0.2. The extraction was carried out at 25° C. to obtain an extract phase and a raffinate phase, respectively. The raffinate phase enters the raffinate phase rectification tower, the operating pressure is 0.5atm, the reflux ratio is 2, the temperature of the tower bottom is controlled at 96°C, and finally the acetic acid product is obtained in the tower bottom. 92.4%. T...

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Abstract

The invention relates to a separation method of an N, N-dimethylacetamide-acetic acid mixed system, which comprises the step of carrying out two-phase multistage counter-current extraction on the N,N-dimethylacetamide-acetic acid mixed system by using an extracting agent group consisting of a hydrophobic phase extracting agent and a hydrophilic phase extracting agent; and feeding the N,N-dimethylacetamide-acetic acid mixed system from the middle of the two-phase multistage counter-current extraction, rectifying an extraction phase and a raffinate phase of the two-phase multi-stage extraction separately, and finally obtaining N,N-dimethylacetamide and acetic acid products separately, so as to realize separation of the mixed system. According to the invention, the two-phase multi-stage counter-current extraction of the selected solvent can effectively break through the restriction of the N,N-dimethylacetamide-acetic acid mixed system, so that the recovery of N,N-dimethylacetamide and acetic acid is realized.

Description

technical field [0001] The invention relates to the field of chemical separation, in particular to a separation method for a N,N-dimethylacetamide-acetic acid mixed system, in particular to an extraction agent group composed of a selected hydrophobic phase extraction agent and a hydrophilic phase extraction agent and The two-phase multi-stage countercurrent extraction process adopted breaks the mixed system and obtains products separately. Background technique [0002] N,N-Dimethylacetamide, referred to as DMAC, is a commonly used colorless and transparent non-protonated solvent. Solubility, widely used in polymer synthesis spinning, medicine and pesticide field, paint industry. In addition, it is also used in catalysis, extraction and electrolysis. [0003] The synthesis process of N,N-dimethylacetamide is mainly based on the amidation reaction of acetic acid and its derivatives with dimethylamine to generate N,N-dimethylacetamide. After the reaction is finished, there w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C231/24C07C233/05C07C51/48C07C51/42C07C53/08
CPCC07C231/24C07C51/48C07C51/42C07C233/05C07C53/08
Inventor 秦磊陈亮吴成跃蔡立鑫
Owner CHINA PETROLEUM & CHEM CORP
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