Method for extracting and separating n-heptane-dimethyl carbonate by ionic liquid

A technology of dimethyl carbonate and ionic liquid, which is applied in extraction and purification/separation, chemical instruments and methods, purification/separation of hydrocarbons, etc. It can solve the separation process of constant boiling agent n-heptane and dimethyl carbonate. , high energy consumption, inability to achieve effective separation, etc.

Active Publication Date: 2021-07-30
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Existing methods all study the separation process of dimethyl carbonate and methanol, and there are few studies on the separation process

Method used

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  • Method for extracting and separating n-heptane-dimethyl carbonate by ionic liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Feed flow rate is 100kg / h, contains n-heptane 10%, dimethyl carbonate 90% (mass fraction) in the feed, liquid-liquid extraction column (LEC) theoretical plate number is 7, n-heptane and dimethyl carbonate The ester mixture enters from the bottom of the liquid-liquid extraction column (LEC), and the ionic liquid enters from the top of the liquid-liquid extraction column (LEC). The extraction agent is 1-octyl-3-methylimidazole trifluoromethanesulfonate, and the flow rate is 70kg / h (the feed flow mass ratio of the ionic liquid to the n-heptane-dimethyl carbonate mixture is 0.7), and the temperature of the liquid-liquid extraction column (LEC) is 25°C. The operating pressure of the flash tank (F1) is 0.5 bar, the operating pressure of the flash tank (F2) is 0.5 bar, the purity of the separated dimethyl carbonate is more than 99.95%, and the yield is more than 99.95%.

Embodiment 2

[0035] The feed flow rate is 100kg / h, and the feed contains 30% of n-heptane and 70% (mass fraction) of dimethyl carbonate. The number of theoretical plates in the liquid-liquid extraction column (LEC) is 10. The mixture of n-heptane and dimethyl carbonate enters from the bottom of the liquid-liquid extraction column (LET), and the extractant enters from the top of the liquid-liquid extraction column (LEC). The agent is 3-methyl-1-octyl-1H-imidazole bis(2,2,2-trifluoroacetyl)imide ionic liquid, and the flow rate is 130kg / h (feed of extractant and phenol-water mixture The flow mass ratio is 1.3), and the temperature of the liquid-liquid extraction column (LEC) is 28.5°C. The operating pressure of the flash tank (F1) is 0.5 bar, the operating pressure of the flash tank (F2) is 0.5 bar, the purity of the separated dimethyl carbonate is 99.98%, and the yield is 99.98%.

Embodiment 3

[0037] The feed flow rate is 100kg / h, and the feed contains 60% of n-heptane and 40% (mass fraction) of dimethyl carbonate. The number of theoretical plates in the liquid-liquid extraction column (LEC) is 15. The mixture of n-heptane and dimethyl carbonate enters from the bottom of the liquid-liquid extraction column (LEC), and the extractant enters from the top of the liquid-liquid extraction column (LEC). The agent is 1-octyl-3-methylimidazolium hexafluorophosphate ionic liquid, the flow rate is 200kg / h (the feed flow mass ratio of extractant and phenol-water mixture is 2), the liquid-liquid extraction column (LEC) The temperature was 32°C. The operating pressure of the flash tank (F1) is 0.5 bar, the operating pressure of the flash tank (F2) is 0.5 bar, the purity of the separated dimethyl carbonate is 99.96%, and the yield is 99.96%.

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Abstract

The invention relates to a method for extracting and separating n-heptane and dimethyl carbonate by using ionic liquid and a device suitable for the method. According to the method, imidazolium ionic liquid is used as an extracting agent, n-heptane and dimethyl carbonate firstly enter a liquid-liquid extraction tower to be extracted and separated, materials on the upper portion of the liquid-liquid extraction tower enter a flash evaporation tank to be separated, high-purity n-heptane is obtained at the top of the flash evaporation tank, materials on the lower portion of the liquid-liquid extraction tower enter another flash tank to be separated, the material flow at the top of the flash evaporation tank enters rectification tower for separating, high-purity n-heptane is obtained from the top of the rectification tower, high-purity dimethyl carbonate is obtained from the bottom of the rectification tower, and the extracting agent is recycled after being extracted from the bottoms of the two flash evaporation tanks. The method has the advantages of low energy consumption, simple process, high purity of n-heptane and dimethyl carbonate after separating and the like, the adopted extracting agent imidazole ionic liquid is almost non-volatile, the loss of the extracting agent is reduced, and the method is easy to recover, good in chemical thermal stability, green and pollution-free.

Description

【Technical field】 [0001] The invention belongs to the field of separation and purification of chemical industry, and in particular relates to a method for extracting and separating n-heptane-dimethyl carbonate by ionic liquid, furthermore, it relates to a method using imidazole ionic liquid as extraction agent, first using an extraction tower, and then using Flash tank, and finally adopt rectification tower to separate the method of n-heptane-dimethyl carbonate mixture. 【Background technique】 [0002] Dimethyl carbonate (DMC) is a "green" chemical product with excellent environmental performance and development prospects. Dimethyl carbonate has excellent characteristics such as high octane number, reduced CO and NOx emissions, and rapid biodegradability. It can be used as a gasoline additive, and it can also be used as a paint solvent because of its low toxicity. The commonly used method for synthesizing dimethyl carbonate is methanol oxidation carbonyl method, but since di...

Claims

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Application Information

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IPC IPC(8): C07C69/96C07C68/08C07C9/15C07C7/10C07C7/04C07C7/00
CPCC07C68/08C07C7/10C07C7/04C07C7/005C07C69/96C07C9/15
Inventor 齐建光李慧媛孟凡庆李鑫朱兆友
Owner QINGDAO UNIV OF SCI & TECH
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