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Method for separating cyclopentane and neohexane by using extractive rectification technology

A technology of extractive distillation and extractive distillation column, which is applied in the field of separation of cyclopentane and neohexane by extractive distillation process, can solve the problems of poor separation effect and high energy consumption in the separation process, and achieve easy separation and good solubility , Facilitate the effect of mass transfer

Active Publication Date: 2016-08-17
PETROCHINA CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The extraction solvent used in the prior art is prone to two-liquid phases when mixed with the cyclopentane / neohexane system, resulting in poor separation effect
Moreover, the boiling point of the above-mentioned solvents is relatively high, so that the energy consumption of the separation process is relatively high.

Method used

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  • Method for separating cyclopentane and neohexane by using extractive rectification technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] In the middle part of the extractive distillation tower 1, the cyclopentane / neohexane system is continuously fed in a saturated gas phase feeding mode; at the same time, at the 4th tray below the top of the extractive distillation tower 1, The solvent at 52°C was fed continuously. In the extractive distillation tower 1, neohexane is separated from cyclopentane under the action of solvent, and then neohexane (gas phase) is distilled from the top of the extractive distillation tower 1 and condensed to liquid through the first condenser 3. The mixture (liquid phase) of cyclopentane and solvent is distilled out from the bottom of the extractive distillation tower 1, and after being further heated by the first reboiler 4, it enters the solvent recovery tower 2. In the solvent recovery tower 2, cyclopentane is separated from the solvent, and then cyclopentane (gas phase) is distilled from the top of the solvent recovery tower 2, and condensed to the liquid phase by the second...

Embodiment 2

[0061] The operation steps of this embodiment and embodiment 1 are basically the same, the difference is:

[0062] 1) The feed temperature of the solvent is 53° C.; and the solvent is fed at the third tray below the top of the extractive distillation column 1 .

[0063] 2) The top pressures of the extractive distillation tower 1 and the solvent recovery tower 2 are both 110kPa.

[0064] 3) The mass ratio of the solvent to the cyclopentane / neohexane system is 5:1.

[0065] 4) The solvent used includes 7 parts by mass of a main solvent and 1 part by mass of a secondary solvent: the main solvent is NMF, and the secondary solvent is cyclopentanol.

[0066] The purity of neohexane and cyclopentane separated in this embodiment was measured, and the results showed that the purity of neohexane was as high as 99.47%, and the purity of cyclopentane was as high as 99.5%. It can be seen that using the method provided by the embodiment of the present invention to separate cyclopentane an...

Embodiment 3

[0068] The operation steps of this embodiment and embodiment 1 are basically the same, the difference is:

[0069] 1) The feed temperature of the solvent is 55° C.; and the solvent is fed at the third tray below the top of the extractive distillation column 1 .

[0070] 2) The top pressures of the extractive distillation tower 1 and the solvent recovery tower 2 are both 112kPa.

[0071] 3) The mass ratio of the solvent to the cyclopentane / neohexane system is 7:1.

[0072] 4) The solvent used includes 4 parts by mass of main solvent and 1 part by mass of secondary solvent: the main solvent is NMF, and the secondary solvent is ethylene glycol.

[0073] The purity of neohexane and cyclopentane separated in this embodiment was measured, and the results showed that the purity of neohexane was as high as 99.45%, and the purity of cyclopentane was as high as 99.43%. It can be seen that using the method provided by the embodiment of the present invention to separate cyclopentane and...

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Abstract

The invention discloses a method for separating cyclopentane and neohexane by using an extractive rectification technology, which belongs to the field of petrochemical industry. A solvent used in the extractive rectification technology comprises the following components by mass part: 1.5-9 parts of a main solvent and 1 part of an auxiliary solvent, wherein the main solvent is N,N-dimethylformamide and / or N-formyl morpholine, and the auxiliary solvent is at least one of 1-butanol, 2-butanol, 1-amyl alcohol, 2-amyl alcohol, cyclopentanol, cyclohexanol, ethylene glycol, propylene glycol, methyl acetate, ethyl acetate, and phenol. The provided method has excellent separating effect for cyclopentane and neohexane as well as has advantage of low energy consumption.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for separating cyclopentane and neohexane by using an extractive distillation process. Background technique [0002] The extractive distillation process is to change the relative volatility of the separated components in the feed liquid by adding solvent near the top of the rectification tower, so that the liquid mixture that is difficult to separate by ordinary rectification (for example, near boiling point system or azeotropic system) is made easy to separate a special distillation method. Extractive distillation can be divided into continuous extractive distillation and batch distillation according to its different operation modes. Continuous extractive distillation is widely used because of its simple operation and high separation efficiency. [0003] In continuous extractive distillation, feed, solvent addition and recovery are all continuous. Continuous ext...

Claims

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Application Information

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IPC IPC(8): C07C13/10C07C9/16C07C7/08
Inventor 邬乐欢曹睿刘艳升刘拥军王雪莲谢国宏昌兴文刘晓燕
Owner PETROCHINA CO LTD
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