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Device and method for separating acetone-n-heptane mixture by extractive distillation

The technology of extractive rectification and extractive rectification tower is applied in the field of devices for extractive rectification and separation of acetone-n-heptane mixture, which can solve the problem of high heat load of reboiler of rectification tower, increase of operating cost, and heat load of rectification tower. High energy consumption, high energy consumption and other problems, to achieve the effect of reducing heat load, reducing pollution, and simple operation

Inactive Publication Date: 2021-02-26
HUIZHI ENG SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used traditional extractants are ethylene glycol, DMF, DMSO, butyl butyrate and butyl propionate, etc. These extractants have a high boiling point, which leads to an excessively high heat load of the rectification column reboiler. Operating costs, contrary to the new concept of energy saving and emission reduction in industry
In addition, the separation sequence corresponding to this kind of extractant is often conventional extractive distillation. The disadvantage of conventional extractive distillation is also that the heat load of the rectification tower is too high, and the high energy consumption increases the operating cost and equipment cost.

Method used

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  • Device and method for separating acetone-n-heptane mixture by extractive distillation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The extractive distillation column of the present embodiment has 65 theoretical plates, the extractant 1-chlorobutane is added from the 25th plate, the flow rate is 1500kg / h, the mixture of acetone and n-heptane (the mol ratio of n-heptane to acetone 0.5:0.5) Added from the 54th plate, the flow rate is 5000kg / h. The extractive distillation tower is operated under normal pressure, the reflux ratio is 25.29, the output at the top of the tower is 2512.56kg / h, and the acetone product with a mass fraction of not less than 0.995 is obtained at the top of the tower. The output at the top of the tower is 2512.54kg / h, and the n-heptane product with a mass fraction of not less than 0.995 is obtained at the bottom of the tower. The extraction agent 1-chlorobutane was produced on the 29th plate, the production amount was 1476.36kg / h, and the mass fraction was 0.999.

Embodiment 2

[0026] The extractive distillation column of the present embodiment has 60 theoretical plates, the extractant 1-chlorobutane is added from the 22nd plate, the flow rate is 2800kg / h, the mixture of acetone and n-heptane (the mol ratio of n-heptane and acetone 0.4:0.6): Added from the 51st plate, the flow rate is 5000kg / h. The extractive distillation column operates under normal pressure, the reflux ratio is 28.18, the output at the top of the tower is 3015.08kg / h, and the acetone product with a mass fraction of not less than 0.995 is obtained at the top of the tower. The output at the top of the tower is 2009.99kg / h, and the n-heptane product with a mass fraction of not less than 0.995 is obtained at the bottom of the tower. The extraction agent 1-chlorobutane was produced on the 25th plate, the production amount was 2777.71kg / h, and the mass fraction was 0.999.

Embodiment 3

[0028] The extractive distillation column of the present embodiment has 63 theoretical plates, the extractant 1-chlorobutane is added from the 25th plate, the flow rate is 2500kg / h, the mixture of acetone and n-heptane (the mol ratio of n-heptane to acetone 0.3:0.7) Added from the 53rd plate, the flow rate is 5000kg / h. The extractive distillation tower is operated under normal pressure, the reflux ratio is 30.21, the output at the top of the tower is 3517.59kg / h, and the acetone product with a mass fraction of not less than 0.995 is obtained at the top of the tower. The output at the top of the tower is 1507.51kg / h, and the n-heptane product with a mass fraction of not less than 0.995 is obtained at the bottom of the tower. The extraction agent 1-chlorobutane was produced on the 29th plate, the production amount was 2477.38kg / h, and the mass fraction was 0.999.

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Abstract

The invention discloses a device and a method for separating an acetone-n-heptane mixture through extractive distillation, and belongs to the technical field of extractive distillation separation. According to the technical scheme, the device comprises an extractive distillation tower, the bottom of the extractive distillation tower is connected with a reboiler, the top of the extractive distillation tower is connected with a first condenser, and a reflux tank is connected between an outlet of the first condenser and a reflux inlet of the extractive distillation tower. The method has the advantages that no entrainer is introduced, the product purity is high, and the operation is simple.

Description

technical field [0001] The invention relates to the technical field of extractive distillation and separation, in particular to a device and method for extractive distillation and separation of acetone-n-heptane mixture. Background technique [0002] Acetone and n-heptane chemical common solvents and organic raw materials, with good solubility. Acetone is used in industries such as explosives, plastics, rubber, fiber, tanning, grease, spray paint, etc. It can also be used as a synthetic ketene, acetic anhydride, iodoform, polyisoprene rubber, methyl methacrylate, chloroform, cyclo An important raw material for substances such as oxygen resins. N-heptane can be used as a standard substance for determination of octane number and synthesis of ethyl acetate, which is of great value in chemical raw materials, industrial solvents, anesthetics and energy. Organic and pharmaceutical wastewater contains mixed solutions of acetone and n-heptane. In order to reduce environmental poll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/40C07C45/83C07C49/08C07C7/08C07C9/15
CPCB01D3/40C07C7/08C07C45/83C07C49/08C07C9/15
Inventor 张义史普赟陈晓荣齐运峰
Owner HUIZHI ENG SCI & TECH CO LTD