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Composite solvent and extraction method for extracting and separating aromatic hydrocarbons

A composite solvent and aromatics separation technology, applied in extraction and purification/separation, refined hydrocarbon oil, organic chemistry, etc., can solve problems such as heat increase, achieve the effects of avoiding increased energy consumption, reducing solvent consumption, and improving the recovery rate of aromatics

Inactive Publication Date: 2013-06-19
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, water is easy to form azeotropic distillation with aromatic hydrocarbons, resulting in a substantial increase in heat requirements, and the presence of water will also lead to hydrolysis reactions.

Method used

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  • Composite solvent and extraction method for extracting and separating aromatic hydrocarbons
  • Composite solvent and extraction method for extracting and separating aromatic hydrocarbons
  • Composite solvent and extraction method for extracting and separating aromatic hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using straight-run naphtha as raw material, its composition is listed in Table 1. Carry out liquid-liquid extraction to recover benzene and toluene according to the process shown in the accompanying drawing, the composite solvent used is composed of: 60g sulfolane, 32g N-methylpyrrolidone and 8.0g polyethylene glycol 400. The main operating conditions of each tower are shown in Table 2, and the separation results of aromatics are shown in Table 3.

Embodiment 2

[0019] Condensate oil is used as raw material, and its composition is listed in Table 1. Carry out liquid-liquid extraction to recover benzene and toluene according to the process shown in the accompanying drawing, the composite solvent used is composed of: 60g N-formylmorpholine, 32g N-methylpyrrolidone and 8.0g ethylene glycol. The main operating conditions of each tower are shown in Table 2, and the separation results of aromatics are shown in Table 3.

Embodiment 3

[0021] Using reformed gasoline as raw material, its composition is listed in Table 1. Carry out liquid-liquid extraction recovery benzene and toluene according to the process shown in the accompanying drawing, the composite solvent adopted is composed of: 60g sulfolane, 32g N-methylpyrrolidone and 8.0g ethylene glycol. The main operating conditions of each tower are shown in Table 2, and the separation results of aromatics are shown in Table 3.

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Abstract

The invention relates to a composite solvent and extraction method for extracting and separating aromatic hydrocarbons from a hydrocarbon mixture in industries of oil refining and chemical engineering, which can achieve the advantages of high aromatic hydrocarbon separation efficiency, favorable heat stability and convenient recovery process. The technical scheme is as follows: the composite solvent comprises the following solvents in percentage by mass: 45-95% of main solvent, 4.5-40% of auxiliary solvent and 0.5-15% of modifier, wherein the main solvent is one of sulfolane or N-formyl morpholine or dimethylsulfoxide or tetraethylene glycol, the auxiliary solvent is one of N-methylpyrrolidone or N,N-dimethylformamide, and the modifier is one of ethylene glycol or polyethyleneglycol; and a preparation method of the composite solvent comprises the following steps: proportionally adding the modifier into the auxiliary solvent, evenly mixing, proportionally adding the mixed solvent into the main solvent, and evenly mixing to prepare the composite solvent. The composite solvent obviously enhances the solubility and selectivity of the solvent on aromatic hydrocarbons, avoids the increase of energy consumption and the occurrence of hydrolysis reaction caused by the situation that water is contained in the solvent, reduces the consumption of the solvent and increases the aromatic hydrocarbon recovery rate.

Description

technical field [0001] The invention relates to a liquid-liquid extraction composite solvent used in oil refining and chemical industry. More specifically, it is a composite solvent used for extracting and separating aromatics from hydrocarbon mixtures and an extraction method thereof. Background technique [0002] Solvent extraction is an important separation process in oil refining and chemical industry, and is widely used in oil refining industry. The extraction of fused-ring or polycyclic aromatic hydrocarbons from lubricating oil raw materials, aromatics from reformed oil or catalytic cracking cycle oil is a solvent extraction process. In order to extract non-ideal components, the ideal components should be left as much as possible. In the raffinate, the choice of solvent is very important. [0003] US3415739 discloses a method for recovering aromatics in hydrocarbon mixtures by liquid-liquid extraction or extractive distillation using a mixture of N-methylpyrrolidone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G21/22C10G21/20C10G21/16C07C7/10C07C15/00
Inventor 唐晓东李晶晶肖坤良温晓红李小红谯勤赵千舒
Owner SOUTHWEST PETROLEUM UNIV
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