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Device and method for separating n-hexane and ethyl acetate mixture

A technology of ethyl acetate and mixtures, which is applied in the preparation of organic compounds, hydrocarbons, and carboxylic acid esters, and can solve problems such as high energy consumption, many equipment, and large consumption of extractants

Active Publication Date: 2021-06-08
HEZE UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] Chinese patent CN104774131A "A method for separating n-hexane-ethyl acetate mixture by extractive distillation" discloses a mixture of dimethyl sulfoxide and N,N-dimethylacetamide as the extraction agent for the extraction of n-hexane -The double-tower continuous extractive distillation process of the ethyl acetate azeotrope system, the theoretical plate number of the extractive distillation column is 60, the n-hexane content of the top product of the extractive distillation column reaches 99.8%, and the ethyl acetate at the top of the extraction agent recovery column The content reaches 99.6%, but the method has high energy consumption and large consumption of extractant
But this method has high energy consumption, many equipments and complicated operation

Method used

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  • Device and method for separating n-hexane and ethyl acetate mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The feed flow rate is 770kg / h, the feed contains 55% n-hexane and 45% ethyl acetate (mass fraction), the number of theoretical plates in the liquid-liquid extraction tower (T) is 6, and the n-hexane-ethyl acetate mixture is extracted from the liquid The bottom of the liquid extraction tower (T) enters, and the extractant enters from the top of the liquid-liquid extraction tower (T). The extractant is 1-hexyl-3-methylimidazole bistrifluoromethanesulfonimide salt, and the flow rate is 600kg / h (the feed flow mass ratio of the extractant to the n-hexane-ethyl acetate mixture is 0.78), and the temperature of the liquid-liquid extraction tower (T) is 25°C. The operating pressure of the flash tank (F) is 0.05 atm, the purity of n-hexane after separation is 99.91%, and the yield is 99.90%, and the purity of ethyl acetate is 99.93%, and the yield is 99.95%.

Embodiment 2

[0032] The feed flow rate is 820kg / h, the feed contains 60% n-hexane and 40% ethyl acetate (mass fraction), the number of theoretical plates in the liquid-liquid extraction tower (T) is 8, and the mixture of n-hexane-ethyl acetate The bottom of the extraction tower (T) enters, and the extractant enters from the top of the liquid-liquid extraction tower (T). The extractant is 1-hexyl-3-methylimidazole bistrifluoromethanesulfonimide salt, and the flow rate is 700kg / h (The mass ratio of the feed flow of the extractant to the n-hexane-ethyl acetate mixture is 0.85), and the temperature of the liquid-liquid extraction tower (T) is 28°C. The operating pressure of the flash tank (F) is 0.04 atm, the purity of n-hexane after separation is 99.93%, and the yield is 99.92%, and the purity of ethyl acetate is 99.95%, and the yield is 99.94%.

Embodiment 3

[0034] The feed flow rate is 870kg / h, the feed contains 65% n-hexane and 35% ethyl acetate (mass fraction), the number of theoretical plates in the liquid-liquid extraction tower (T) is 10, and the n-hexane-ethyl acetate mixture is extracted from the liquid The bottom of the liquid extraction tower (T) enters, and the extractant enters from the top of the liquid-liquid extraction tower (T). The extractant is 1-hexyl-3-methylimidazole bistrifluoromethanesulfonimide salt, and the flow rate is 750kg / h (the feed flow mass ratio of the extractant to the n-hexane-ethyl acetate mixture is 0.86), and the temperature of the liquid-liquid extraction tower (T) is 27°C. The operating pressure of the flash tank (F) is 0.06 atm, the purity of n-hexane after separation is 99.95%, and the yield is 99.96%, and the purity of ethyl acetate is 99.92%, and the yield is 99.94%.

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Abstract

The invention discloses a device for separating and n-hexane and ethyl acetate mixture. The device comprises a liquid-liquid extraction tower and a flash tank, the upper part of the liquid-liquid extraction tower is provided with an extractant feed pipe, the lower part of the liquid-liquid extraction tower is provided with a mixture feed pipe, the top of the liquid-liquid extraction tower is provided with a first discharge pipe, and the tower bottom is sequentially connected with a first centrifugal pump and a flash tank through a raffinate phase conveying pipe; the top of the flash tank is connected with the condenser through a second discharge pipe, and the bottom of the flash tank is sequentially connected with a cooler and a mixer through a return pipe; the mixer is connected with a liquid-liquid extraction tower through an extraction agent feeding pipe, and an extraction agent supplementing pipe is further mounted on the mixer. The invention also discloses a method for separating the n-hexane and ethyl acetate mixture through ionic liquid by using the device. The problem that the n-hexane and ethyl acetate mixture is difficult to separate is solved, the process is simple, and fewer devices are needed.

Description

technical field [0001] The invention belongs to the field of chemical separation and purification, and in particular relates to a method for ionic liquid liquid-liquid extraction-flash separation of n-hexane-ethyl acetate mixture, furthermore, it relates to an extraction tower using imidazole ionic liquid as an extraction agent , and then adopt the flash tank liquid-liquid extraction-flash separation method of n-hexane-ethyl acetate mixture. Background technique [0002] n-Hexane and ethyl acetate are widely used in medicine, spray paint, furniture manufacturing and other industries, and are common chemical substances in daily life. n-Hexane is a very important organic chemical raw material and organic solvent, which can be used as a solvent for the polymerization of propylene and other olefins and for the manufacture of norfloxacin capsules, an extractant for edible vegetable oil, a solvent for rubber and paint, and a thinner for pigments. Ethyl acetate is a widely used es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/10C07C9/15C07C67/52C07C67/58C07C69/14
CPCC07C7/005C07C7/10C07C67/52C07C67/58C07C9/15C07C69/14Y02P20/10
Inventor 赵玉军姜会民薛守庆武利顺
Owner HEZE UNIV
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