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Method and system for separating n-hexane and methylcyclopentane

A technology of methylcyclopentane and n-hexane, applied in the field of organic matter purification, can solve the problems of high reflux ratio, number of plates, limited selectivity, etc., and achieve effective separation

Inactive Publication Date: 2018-11-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the selectivity of this type of organic extractant is limited. In order to obtain high-purity n-hexane above 99% by weight, it still depends on a higher reflux ratio and number of plates

Method used

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  • Method and system for separating n-hexane and methylcyclopentane
  • Method and system for separating n-hexane and methylcyclopentane

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0065] In this experiment example, the figure 1 The system of the shown separation normal hexane and methylcyclopentane, concrete flow process is as follows:

[0066] The actual number of plates in the extractive distillation column is 45, the operating pressure is normal pressure, the operating reflux ratio is 3.6, the temperature at the top of the tower is controlled at 68-69°C, the temperature at the bottom of the tower is 113-114°C, and the ionic liquid at 25°C [C 10 Im] [SCN] enters by tower top, and the massfraction of 25 ℃ is that the near boiling mixture of the n-hexane-25% of 75% methylcyclopentane enters with the flow rate of 100kg / h by the 30th plate, controls ionic liquid and The mass ratio of the raw materials is 1:5, the steam rising from the top of the tower is condensed by the top condenser, and the reflux liquid is refluxed from the top of the tower. The output of the top of the tower is 715kg / h, and the n-hexane product with a mass fraction of 99.07% is obtai...

Embodiment 2

[0068] In this experiment example, the figure 1 The system of the shown separation normal hexane and methylcyclopentane, concrete flow process is as follows:

[0069] The actual number of plates in the extractive distillation column is 45, the operating pressure is normal pressure, the operating reflux ratio is 3.6, the temperature at the top of the tower is controlled at 68-69°C, the temperature at the bottom of the tower is 124-125°C, and the ionic liquid at 25°C [C 10 Im] [SCN] enters by tower top, and the massfraction of 25 ℃ is that the near-boiling mixture of 80% normal hexane-20% methylcyclopentane enters with the flow rate of 100kg / h by the 29th plate, controls ionic liquid and The mass ratio of the raw materials is 1:5, the steam rising from the top of the tower is condensed by the top condenser, and the reflux liquid is refluxed from the top of the tower. The output at the top of the tower is 780kg / h, and the n-hexane product with a mass fraction of 99.03% is obtaine...

Embodiment 3

[0071] In this experiment example, the figure 1 The system of the shown separation normal hexane and methylcyclopentane, concrete flow process is as follows:

[0072] The actual number of plates in the extractive distillation column is 45, the operating pressure is normal pressure, the operating reflux ratio is 3.6, the temperature at the top of the tower is controlled at 68-69°C, the temperature at the bottom of the tower is 138-139°C, and the ionic liquid at 25°C [C 10 Im] [SCN] enters by tower top, and the massfraction of 25 ℃ is that the near-boiling mixture of 85% normal hexane-15% methylcyclopentane enters with the flow rate of 100kg / h by the 27th plate, controls ionic liquid and The mass ratio of the raw materials is 1:5, the steam rising from the top of the tower is condensed by the top condenser, and the reflux liquid is refluxed from the top of the tower. The output of the top of the tower is 840kg / h, and the n-hexane product with a mass fraction of 99.10% is obtaine...

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Abstract

The invention provides a method and system for separating n-hexane and methylcyclopentane. According to the method, an extractive distillation process is employed for treating a raw material containing n-hexane and methylcyclopentane so as to separate n-hexane and methylcyclopentane; an extraction agent containing ionic liquid is used in the extractive distillation process; and the ionic liquid isN-alkylimidazole ionic liquid, and the chain length of the alkyl group of the N-alkylimidazole ionic liquid is C8-C14. Based on the mono-substituted N-alkylimidazole ionic liquid with the specific chain length, the method can improve the volatility of n-hexane relative to methylcyclopentane and effectively separate n-hexane and methylcyclopentane, so a high-purity n-hexane product is prepared; the method is high in recovery rate and simple in operation flow; subsequent separation is more convenient; the extraction agent is free of toxicity, harm and loss, and can be regenerated and reused, which is favorable for industrial production.

Description

technical field [0001] This specification belongs to the technical field of organic matter purification, and specifically relates to a method and system for separating n-hexane and methylcyclopentane. Background technique [0002] N-hexane is a chemical product with a wide range of uses. It is mainly used in polymer production, edible oil extraction, extraction of pharmaceutical intermediates, electronic cleaning and other industries. For example, as a polymerization agent for polyethylene and polypropylene, a paint thinner, extraction of various edible oils such as soybeans, rice bran, and cottonseed, and oils in spices. 6 # Solvent oil is mainly C 6 Alkane mixture is the main industrial source for producing n-hexane. The content of n-hexane is about 25wt%, and the content of methylcyclopentane is 6-10wt%. The cyclopentane system is a near-boiling system, that is, a difficult-to-separate system. [0003] At present, the separation of n-hexane and methylcyclopentane from...

Claims

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Application Information

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IPC IPC(8): C07C7/08C07C9/15C07C13/10
CPCC07C7/08C07C9/15C07C13/10C07C2601/08
Inventor 陈立芳晁贺漆志文
Owner PETROCHINA CO LTD
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