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Compounded solvent for separating cycloalkanes and aromatic hydrocarbons from naphtha, and preparation method and application thereof

A technology for naphtha and naphthenic hydrocarbons, which is applied to a compound solvent for separating naphthenic hydrocarbons and aromatic hydrocarbons from naphtha and the fields of preparation and application thereof, can solve the problem of increased demand for naphtha and unsatisfactory naphthenic hydrocarbons. Use and other issues to achieve the effect of reducing costs

Active Publication Date: 2018-09-07
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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  • Compounded solvent for separating cycloalkanes and aromatic hydrocarbons from naphtha, and preparation method and application thereof
  • Compounded solvent for separating cycloalkanes and aromatic hydrocarbons from naphtha, and preparation method and application thereof
  • Compounded solvent for separating cycloalkanes and aromatic hydrocarbons from naphtha, and preparation method and application thereof

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preparation example Construction

[0056] The present invention also provides the preparation method of the above-mentioned compound solvent for separating naphthenes and aromatics from naphtha, the preparation method comprising the following steps:

[0057] Keep the temperature of sulfolane constant at 60-80°C, then dropwise add 1-n-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide salt, and stir until the compound solvent is evenly mixed;

[0058] Wherein, the mass ratio of the 1-n-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide salt to sulfolane is 1:2-100.

[0059] The present invention further provides a method for separating cycloalkanes and aromatics from naphtha with a compound solvent. The method is to contact the compound solvent with the naphtha in countercurrent, and perform a liquid-liquid extraction process to obtain the ane naphtha. A mixture of by-product compound solvents and cycloalkanes and aromatics;

[0060] Wherein, the compound solvent includes 1-n-butyl-1-met...

Embodiment 1

[0088] 1-butyl-1-methylpyrrole bistrifluoromethanesulfonimide salt and sulfolane are compounded to prepare a compound solvent, and the compounding ratio is ionic liquid: sulfolane=1:2 (quality), and the naphtha fraction is prepared according to figure 1 Extraction and separation are carried out according to the flow process. The ionic liquid and sulfolane are drawn from their respective storage tanks and enter the static mixer M. After being fully mixed, they are introduced from the top of the extraction tower 1, and are countercurrently contacted with the naphtha entering from the bottom of the extraction tower 1. ; After liquid-liquid extraction extraction, extraction tower 1 overhead flow is the naphtha (raffinate) that has removed part naphthenes and aromatics, and most of naphthenes and aromatics and whole compound solvent are together from extraction tower 1 The bottom of the tower is drawn to the vacuum distillation tower 2; after vacuum distillation, the compound solven...

Embodiment 2

[0091] This embodiment is basically the same as Embodiment 1, and the specific steps are as follows:

[0092] 1-butyl-1-methylpyrrole bistrifluoromethanesulfonimide salt and sulfolane are compounded to prepare a compound solvent, and the compounding ratio is ionic liquid: sulfolane=1:10 (quality), and the naphtha fraction is prepared according to figure 1 Extraction and separation are carried out according to the flow process. The ionic liquid and sulfolane are drawn from their respective storage tanks and enter the static mixer M. After being fully mixed, they are introduced from the top of the extraction tower 1, and are countercurrently contacted with the naphtha entering from the bottom of the extraction tower 1. ; After liquid-liquid extraction extraction, extraction tower 1 overhead flow is the naphtha (raffinate) that has removed part naphthenes and aromatics, and most of naphthenes and aromatics and whole compound solvent are together from extraction tower 1 The bottom...

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Abstract

The invention discloses a compounded solvent for separating cycloalkanes and aromatic hydrocarbons from naphtha, and a preparation method and an application thereof. The compounded solvent comprises 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide and sulfolane according to a mass ratio of 1:(2-100). The preparation method comprises the following steps: keeping the temperature of the sulfolane constant at 60-80 DEG C, dropwise adding the 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, and performing stirring until the compounded solvent is mixed evenly. The compounded solvent is suitable for separating the cycloalkanes and aromatic hydrocarbons from low-aromatic hydrocarbon and high-cycloalkane naphtha in order to make components in the naphtha separated ina component form and make the best use of the components.

Description

technical field [0001] The invention relates to a compound solvent containing an ionic liquid suitable for separating naphthenes and aromatics from naphtha, a preparation method and application 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 yield of ethylene during cracking, and are easy to coke, which shortens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G21/22C10G21/27C10G21/30
CPCC10G21/22C10G21/27C10G21/30
Inventor 曾群英李进龙陈谦王辉杨春基王昕贺德福张波张爱萍孙淑坤张德顺张永军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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