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A system and method for recovering refined methylcyclopentane and its application

A technology of methylcyclopentane and reflux ratio, which is applied in chemical instruments and methods, purification/separation of hydrocarbons, sustainable manufacturing/processing, etc., and can solve problems such as failing to meet high purity requirements

Active Publication Date: 2020-08-11
JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the purification and refining of methylcyclopentane, the commonly used extraction agents for extractive distillation include dimethyl phthalate and N-methylpyrrolidone. Patent CN1765857A and patent CN103664446A use dimethyl phthalate and N-methylpyrrolidone respectively. Pyrrolidone is used as an extractant to separate n-hexane and methylcyclopentane, and the purity of methylcyclopentane extracted from the top of the tower is ≧84wt% and ≧90.8wt%, which is far below the high purity requirement of 99.95wt%.

Method used

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  • A system and method for recovering refined methylcyclopentane and its application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A system for recovering refined methylcyclopentane, such as figure 1 As shown, it includes a delightening unit 7, a purification unit 8 and a solvent recovery unit 9 connected in sequence, and also includes a heat exchange unit 10;

[0053] Wherein, light removal unit 7 is extractive distillation column I1; purification unit 8 is extractive distillation column II2; heat exchange unit 10 includes first plate heat exchanger 4, second plate heat exchanger 5 and third plate heat exchanger independently Heat exchanger 6; the solvent recovery unit is a rectifying tower 3; the raw material input pipeline is connected to the raw material inlet on the extractive distillation tower I1 after passing through the first plate heat exchanger 4; the bottom of the extractive distillation tower I1 is provided There is a first pipeline, which is connected to the extractive distillation tower II2 after passing through the second plate heat exchanger 5; the bottom of the extractive distilla...

Embodiment 2

[0060] The system is the same as in Embodiment 1, and the method is similar, except that:

[0061] The composition of the extractant is: the content of DMF is 80wt%, and the content of DES is 20wt%. DES is a deep eutectic solvent obtained by stirring hydrogen bond acceptors and hydrogen bond donors with a molar ratio of 1:5 at 90°C until transparent ; The hydrogen bond acceptor is: choline chloride, and the hydrogen bond donor is levulinic acid. The operating pressure of extractive distillation column I1 is 1.4MPa, the temperature at the top of the tower is 27.5°C, the temperature of the tower bottom is 105°C, and the reflux ratio is 0.3; The ratio is 8; the operating pressure of rectification tower 3 is 1.5MPa, the tower top temperature is 95°C, the tower bottom temperature is 200°C, and the reflux ratio is 1.5;

[0062] The purity of the methylcyclohexane product extracted from the top of the extractive distillation column II2 is 99.97w%, and the recovery rate is 99.05%.

Embodiment 3

[0064] The system is the same as in Embodiment 1, and the method is similar, except that:

[0065]The composition of the extractant is as follows: the content of sulfolane is 45 wt %; the content of DES is 30 wt %; and the content of ethylene glycol is 25 wt %. DES is a deep eutectic solvent obtained by stirring hydrogen bond acceptors and hydrogen bond donors at a molar ratio of 1:10 until transparent at 100°C; the hydrogen bond acceptor is betaine, and the hydrogen bond donor is urea. The operating pressure of extractive distillation column I1 is 1.4MPa, the temperature at the top of the column is 28°C, the temperature at the bottom of the column is 110°C, and the reflux ratio is 0.5; , the reflux ratio is 10; the operating pressure of the rectification tower is 1.5MPa, the tower top temperature is 95°C, the tower bottom temperature is 210°C, and the reflux ratio is 1.

[0066] The purity of the methylcyclohexane product extracted from the top of the extractive distillation...

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Abstract

The invention relates to a system and a method for recycling refined methyl cyclopentane and application of the system and the method. The system comprises a dehydrogenation unit, a purification unit,a solvent recycling unit as well as a heat exchange unit, wherein the dehydrogenation unit, the purification unit and the solvent recycling unit are sequentially connected; the dehydrogenation unit is a first extraction distillation column; the purification unit is a second extraction rectification unit; the heat exchange unit comprises a first heat exchanger, a second heat exchanger and a thirdheat exchanger which are independent from one another; a raw material input pipeline penetrates through the first heat exchanger and then is connected with a raw material inlet in the first extractiondistillation column; a first pipeline is arranged at the bottom of the first extraction distillation column, and so on in a similar manner. An extraction agent used in the method is a mixed solvent which is composed of one or a combination of at least two of sulfolane, ethylene glycol, glycerin, NMF (N-Formylmorpholine), NMP (N-Methyl Pyrrolidone) and DMF (Dimethyl Formamide), and a deep-eutecticsolvent in a compounded manner. By adopting the system and the method, a methyl cyclopentane product of which the purity is greater than 99.95wt% can be purified at one time, and the recycling rate of methyl cyclopentane is greater than 99%.

Description

technical field [0001] The invention relates to the technical field of chemical organic separation, in particular to a system and method for recovering and refining methylcyclopentane and its application. Background technique [0002] Industrial processes such as hydrocarbon raffinate and cyclohexanone production will produce cyclohexane, methylcyclopentane, butane, n-pentane, benzene and other by-products, among which methylcyclopentane can be used as solvent, chromatographic standard Substances, organic synthesis raw materials, etc., have a wide range of uses and are expensive. If the methylcyclopentane in the by-product can be recycled, good economic benefits can be obtained. However, the output of low-purity methylcyclopentane is high and the price is average in the market, and the output of high-purity methylcyclopentane is low and expensive. The future development direction of chemical technology is fine chemical industry. The production of fine chemicals with high p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/00C07C7/08C07C7/04C07C13/10
CPCC07C7/005C07C7/04C07C7/08C07C13/10Y02P20/10
Inventor 华超李静白芳王庆格陆平
Owner JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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