Complex solvent and application thereof

A composite solvent and co-solvent technology, which is applied in the petroleum industry, azeotropic/extractive distillation, and hydrocarbon oil treatment, can solve the problems of difficult separation of solvents and aromatics, poor selectivity of aromatics, etc., to reduce selectivity, ensure selectivity, The effect of high solubility and selectivity

Active Publication Date: 2018-11-02
BEIJING ENERGY ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of poor selectivity of aromatics extraction solvents in the pri

Method used

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  • Complex solvent and application thereof

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Embodiment approach

[0033] According to a preferred embodiment of the present invention, the olefin polymerization inhibitor is tert-butylcatechol and / or 2-sec-butyl-4,6-dinitrophenol, and the preferred olefin polymerization inhibitor and composite solvent When the main solvent and co-solvent are used together, it has a better effect of inhibiting the polymerization of olefins, and the performance of the composite solvent is more excellent.

[0034] The present invention has a wide range of options for the sulfone compound, which can be various sulfone compounds commonly used in the art. For example, the sulfone compound can be selected from sulfolane, 3-methylsulfolane, dimethyl sulfone and di-n- At least one of propyl sulfones, preferably sulfolane. Sulfolane has better solubility in hydrocarbons and better selectivity to aromatics.

[0035] During the operation of the compound solvent mainly composed of sulfone compounds, due to the O in the system 2The mixing of sulfone compounds is prone t...

Embodiment 1

[0050] The medium gasoline fraction is introduced into the middle part of the extractive distillation tower, and the composite solvent F-1 (see Table 2 for the specific composition) is introduced into the extractive distillation tower from the top (the mass ratio of the composite solvent to the medium gasoline fraction is 2:1), and after extraction Distillation, extractive distillation conditions include: the temperature of entering the tower is 84°C, the temperature of the top of the tower is 76-77°C, the temperature of the bottom of the tower is 158-160°C, the operating pressure of the top of the tower is 0.1MPa, and the raffinate is discharged from the top of the extractive distillation tower Oil, the extracted oil rich in aromatics and sulfides at the bottom of the extractive distillation tower enters the stripping tower for stripping. The feed mass ratio was 1. The lean solvent is obtained at the bottom of the tower, and the sulfur-rich aromatics are obtained at the top o...

Embodiment 2

[0058] According to the method described in Example 1, the difference is that the composite solvent F-2 of the same quality and different composition is used to replace the composite solvent F-1. The composition of composite solvent F-2 is shown in Table 2. After the system has been in operation for 6 months, the resulting poor solvent has a pH value of about 7, and there is no polymerized olefin suspension in the poor solvent. Only 3.5% by weight of aromatics, 3.2% by weight of sulfur, and 94.9% by weight of olefins are present in the raffinate; 96.5% by weight of aromatics, 96.8% by weight of sulfur, 5.1% by weight of olefins.

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Abstract

The invention relates to the field of aromatics extraction and discloses a complex solvent and application thereof. The complex solvent comprises a main solvent, a cosolvent and an olefin polymerization inhibitor. Based on the total weight of the complex solvent, the content of the main solvent is 70-99 wt%, the content of the cosolvent is 0.999-29.9 wt%, and the content of the olefin polymerization inhibitor is 10-1000ug/g; the main solvent is selected from sulfone compounds; the cosolvent is selected from at least one of N-methyl pyrrolidone, triglycol monomethyl ether, tetraethylene glycolmonomethyl ether, furfural and dimethylacetamide; the olefin polymerization inhibitor is selected from at least one of p-tert-butylcatechol, diethylhydroxylamine, dipropyl hydroxylamine, 2-sec-butyl-4,6-dinitrophenol and sodium nitrite. The complex solvent has high selectivity on aromatic hydrocarbons and sulfides, is capable of reducing the selectivity of the olefins and inhibiting olefin polymerization, and is very suitable to be used during extractive distillation.

Description

technical field [0001] The invention relates to the field of extraction of aromatic hydrocarbons, in particular to a composite solvent and its application. Background technique [0002] Aromatics extraction is the process of separating high-purity aromatics from hydrocarbon mixtures with the help of selective solvents. The specifications of the extraction process depend largely on the performance of the solvent. A good industrial extraction solvent should have the following characteristics: good selectivity to aromatics, which is conducive to improving the purity of aromatics; large solubility to aromatics, which is beneficial to reduce solvent ratio and operating costs; large boiling point difference with aromatics, so as to be compatible with aromatics Solvent separation; good thermal and chemical stability to ensure that aromatics are not polluted by degradation substances; non-toxic, non-corrosive, easy to operate and equipment material selection; cheap and easy to obta...

Claims

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Application Information

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IPC IPC(8): C10G7/08
CPCC10G7/08C10G2300/104C10G2300/44
Inventor 曲良龙耿新水姚伟
Owner BEIJING ENERGY ENG TECH
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