Method for producing n-hexane through raffinate oil

A technology for n-hexane and raffinate oil, which is applied in the field of reforming raffinate oil recovery and utilization, can solve problems such as difficult separation, and achieve the effects of wide adaptability and reduced energy consumption.

Active Publication Date: 2018-05-15
山东海成石化工程设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention aims to propose a method for utilizing raffinate oil to produce normal hexane, and the methylcyclopentane in the raffinate oil is converted into cyclohexane and benzene with relatively higher industrial value or generated with normal hexane C1-C5 small molecular light hydrocarbons with relatively large relative volatility solve the problem of difficult separation of methylcyclopentane and n-hexane systems, and prepare high value-added n-hexane solvents

Method used

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  • Method for producing n-hexane through raffinate oil
  • Method for producing n-hexane through raffinate oil
  • Method for producing n-hexane through raffinate oil

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The complete composition of the reformed raffinate in the catalytic reforming unit of a petrochemical company is shown in Table 1. The company's raffinate contains more C5 components and a certain amount of heavy components. According to the full composition of the raffinate oil in Table 1, the content of methylcyclopentane is relatively high, and the isomerization reaction should be selected to obtain cyclohexane and benzene with relatively higher industrial value.

[0050] Such as figure 1 Shown is the schematic process flow diagram of embodiment 1. The raffinate oil is exchanged with the material in the bottom of the weight-shearing tower and then sent to the weight-shearing tower. C5 and C6 components are distilled from the top of the tower, and heavy components such as C7 and C8 are extracted from the bottom of the tower.

[0051] The C5C6 components distilled from the top of the weight-shear tower are first mixed with the circulating hydrogen, and then exchanged...

Embodiment 2

[0060] Table 2 shows the PONA group composition of reformed raffinate oil from a catalytic reforming unit of a Sinopec company. The company's raffinate oil is mainly composed of C6-C7 isoparaffins and normal paraffins, basically free of olefins and aromatics, of which n-hexane accounts for 93.7% of the total content of normal paraffins. According to the PONA group composition of raffinate oil in Table 2, the content of methylcyclopentane is relatively low, and hydrocracking reaction should be used. The cracking reaction mainly produces small molecular light hydrocarbons of C1-C5, which has greater relative volatility and is easier to realize. The separation from n-hexane, the implementation process of the hydrocracking reaction is described below.

[0061] The implementation process is implemented according to the schematic diagram of the technological process of Example 1, and the difference is that the fixed-bed reactor of Example 1 is an isomerization fixed-bed reactor, and...

Embodiment 3

[0068] The complete composition of No. 6 solvent oil is shown in Table 3. According to Table 3, it can be seen that the content of methylcyclopentane is relatively high, and the isomerization reaction should be selected to obtain cyclohexane and benzene with relatively higher industrial value. The implementation process was carried out according to the schematic process flow diagram of Example 1, and the operating temperature of the fixed-bed reactor was 270°C. At this operating temperature, the selectivity of cyclohexane was greater than that of benzene.

[0069] Table 3 The complete composition of No. 6 solvent oil

[0070] components

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Abstract

The invention provides a method for producing n-hexane through raffinate oil. The method comprises the following steps: (1) rectifying raffinate oil through a de-heavy fractionator; distilling off C5and C6 components in raffinate oil from the top of the de-heavy fractionator; and extracting mixed C7 and C8 heavy components from the bottom of the de-heavy fractionator; (2) preheating the C5 and C6components obtained in step (1); feeding into a fixed bed reactor; and performing isomerization reaction or hydrocracking reaction through methyl cyclopentane in the presence of a bifunctional catalyst under hydrogen service condition; and (3) conveying the reaction product obtained in step (2) to a gas-liquid separator; returning the separated gas phase product as circulating hydrogen to the fixed bed reactor for recycling; conveying the liquid phase product to a stabilizing tower; and distilling off little hydrogen and little cracking small molecule light dydrocarbon from the top of the de-heavy fractionator after processing. According to the method, methyl cyclopentane in raffinate oil is converted into a chemical substance of which the boiling point is highly different from n-hexane,so that the energy consumption in purification of n-hexane is greatly decreased.

Description

technical field [0001] The invention belongs to the field of recovery and utilization of reformed raffinate oil, and in particular relates to a method for producing normal hexane by utilizing raffinate oil. Background technique [0002] The octane number of reformed raffinate is low, generally only about 60, which is not suitable for use as vehicle fuel oil, and its use as blending oil is limited. However, the raffinate oil contains extremely low impurities such as sulfur, nitrogen and heavy metals, which is suitable for the production of high-quality solvent oil, high value-added hexane oil and isohexane oil, etc. However, the composition of raffinate is complex, usually containing methylcyclopentane whose boiling point is very close to that of n-hexane. In order to obtain high-purity n-hexane, a large number of theoretical plates and a large reflux ratio are required to separate n-hexane and methylcyclopentane through conventional distillation, and the energy consumption ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/148C07C7/04C07C9/15
CPCC07C7/005C07C7/04C07C7/148C07C9/15
Inventor 王春生张聪于浩强马岩龙周志国袁树成
Owner 山东海成石化工程设计有限公司
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