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Compound solvent for separating cycloalkanes and aromatic hydrocarbons from naphtha, and preparation method and application of compound solvent

A technology for producing naphthenes and naphtha, which is applied in the field of compound solvents for separating naphthenes and aromatics from naphtha and its preparation and application, can solve the problem that the demand for naphtha is increasing, and naphthenes are not widely obtained. Good utilization and other issues to achieve the effect of reducing costs

Active Publication Date: 2019-09-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above-mentioned technology can obtain ethylene cracking raw materials rich in n-alkanes and increase the yield of ethylene, the demand for naphtha has also increased significantly at the same time, and the naphthenes in naphtha have not been well utilized

Method used

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  • Compound solvent for separating cycloalkanes and aromatic hydrocarbons from naphtha, and preparation method and application of compound solvent
  • Compound solvent for separating cycloalkanes and aromatic hydrocarbons from naphtha, and preparation method and application of compound solvent
  • Compound solvent for separating cycloalkanes and aromatic hydrocarbons from naphtha, and preparation method and application of compound solvent

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preparation example Construction

[0054] The present invention also provides the preparation method of the above-mentioned compound solvent for separating naphthenes and aromatics from naphtha, the method comprising the steps of:

[0055] Keep the temperature of sulfolane constant at 60-80°C, then add 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt dropwise, and stir until the compound solvent is evenly mixed;

[0056] Wherein, the mass ratio of the 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt to sulfolane is 1:2-100.

[0057] The present invention further provides a method for separating naphthenes and aromatics from naphtha with the above-mentioned compound solvent. The method is to contact the compound solvent with naphtha countercurrently, and perform a liquid-liquid extraction process to obtain Yiene naphtha. A mixture of by-product compound solvents and cycloalkanes and aromatics;

[0058] Wherein, the compound solvent includes 1-ethyl-3-methylimidazole bistrifluoromethane...

Embodiment 1

[0084] 1-ethyl-3-methylimidazole bis-trifluoromethanesulfonimide salt and sulfolane are compounded to prepare a compound solvent, and the compounding ratio is ionic liquid: sulfolane=1:2 (quality), according to figure 1 The flow process extracts and separates the naphtha fraction. The ionic liquid and sulfolane are drawn from their respective storage tanks and enter the static mixer M. Naphtha countercurrent contact; after liquid-liquid extraction and extraction, the overhead stream of extraction tower 1 is naphtha (raffinate) from which part of the naphthenes and aromatics have been removed, while most of the naphthenes and aromatics and all compound solvents Together, they are drawn from the bottom of the extraction tower 1 to the vacuum distillation tower 2; after vacuum distillation, the compound solvent flows out from the bottom of the vacuum distillation tower 2 and circulates to the top of the extraction tower 1, and after mixing with the fresh compound solvent Together...

Embodiment 2

[0087] This embodiment is basically the same as Embodiment 1, and the specific steps are as follows:

[0088] 1-ethyl-3-methylimidazole bis-trifluoromethanesulfonimide salt and sulfolane are compounded to prepare a compound solvent, and the compounding ratio is ionic liquid: sulfolane=1:10 (quality), according to figure 1 The flow process extracts and separates the naphtha fraction. The ionic liquid and sulfolane are drawn from their respective storage tanks and enter the static mixer M. Naphtha countercurrent contact; after liquid-liquid extraction and extraction, the overhead stream of extraction tower 1 is naphtha (raffinate) from which part of the naphthenes and aromatics have been removed, while most of the naphthenes and aromatics and all compound solvents Together, they are drawn from the bottom of the extraction tower 1 to the vacuum distillation tower 2; after vacuum distillation, the compound solvent flows out from the bottom of the vacuum distillation tower 2 and ci...

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Abstract

The invention discloses a compound solvent for separating cycloalkanes and aromatic hydrocarbons from naphtha, and a preparation method and application of the compound solvent. The compound solvent comprises 1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide and sulfolane according to a mass ratio of 1:(2-100). The preparation method comprises the following steps: keeping the temperature of sulfolane at 60-80 DEG C, then dropwise adding 1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide, and carrying out stirring until the compound solvent is uniformly mixed. The compound solvent disclosed by the invention is suitable for separating cycloalkanes and aromatic hydrocarbons from naphtha with relatively low aromatic content and high naphthenic content, so that components in the naphtha can be separated according to components, and then the components are fully used.

Description

technical field [0001] The invention relates to a compound solvent suitable for separating naphthenes and aromatics from naphtha and a preparation method thereof, a method for separating naphthenes and aromatics from naphtha by the compound solvent and a device thereof. Background technique [0002] Naphtha is composed of normal alkanes, isoparaffins, naphthenes and aromatics, and is an important raw material for catalytic reforming and ethylene cracking. Among them, the cracking of n-alkanes and isoparaffins has a high yield of ethylene, which cannot be converted into aromatics in the reforming process, so they are ideal raw materials for ethylene cracking. After the cracking of naphthenes, high yields of propylene and butadiene can be obtained, and at the same time, they can be easily converted into aromatics under reforming conditions. Therefore, naphthenes are suitable as raw materials for ethylene cracking and catalytic reforming. Aromatics do not contribute to the yie...

Claims

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Application Information

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IPC IPC(8): C10G21/27C10G53/04
CPCC10G21/27C10G53/04C10G2300/1037
Inventor 陈谦李进龙杨春基王辉曾群英王昕张永军张波张爱萍孙淑坤贺德福张德顺李影辉王淑兰李文鹏关伟宏王凤荣王力博衣学飞刘剑
Owner PETROCHINA CO LTD
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