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Method for producing p-xylene employing diverse raw materials

A technology for p-xylene and xylene, which is applied in the field of diversifying raw materials to produce p-xylene, can solve the problems of single raw material source components, poor flexibility in raw material adjustment, etc., and achieves the effect of simple process

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing aromatics complex for producing p-xylene has the problems of single raw material source components and poor flexibility in raw material adjustm

Method used

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  • Method for producing p-xylene employing diverse raw materials

Examples

Experimental program
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Effect test

Embodiment 1

[0020] With light cycle pyrolysis oil and naphtha as fresh raw materials, the composition of raw materials is shown in Table 1.

[0021] Process flow like figure 1 As shown, 40t / h of fresh light cycle pyrolysis oil feedstock enters the selective hydrocracking unit reaction, and the reaction product separates light components and enters the raw material pre-separation unit, where C5-C6 components, C7-C10 components, and C11+ are sequentially separated Components. Among them, the C5-C6 components are used as the reaction raw materials and the fresh naphtha raw materials 60t / h enter the reforming unit for reaction. The C7-C10 components and the C7 components from the toluene tower top cycle and the side line of the heavy aromatics tower produce C9-C10 groups. And enter the transalkylation unit together. The products of the reforming unit and the transalkylation unit enter the product separation unit together to separate C1-C4 light components, C5-C6 components and C7+ components. ...

Embodiment 2

[0030] With light cycle pyrolysis oil and naphtha as fresh raw materials, the composition of raw materials is shown in Table 1.

[0031] Process flow like figure 1 As shown, 50t / h of fresh light cycle pyrolysis oil feedstock enters the selective hydrocracking unit for reaction, and the reaction product separates the light components and then enters the feedstock pre-separation unit, where C5-C6 components, C7-C10 components and C11+ are sequentially separated Components. Among them, C5-C6 components are used as reaction raw materials to enter the reforming unit together with fresh naphtha raw materials 55t / h. C7-C10 components and C7 components from the toluene tower top cycle and C9-C10 groups are produced from the side line of the heavy aromatics tower. And enter the transalkylation unit together. The products of the reforming unit and the transalkylation unit enter the product separation unit together to separate C1-C4 light components, C5-C6 components and C7+ components. T...

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Abstract

The invention relates to a method for producing p-xylene employing diverse raw materials, and mainly aims at solving the problems of single raw material source and poor raw material adjustment flexibility in the prior art. The method comprises the following steps: feeding catalytically cracked light cycle oil to a selective hydrogenation open loop unit to generate a mixture I; introducing C5-C6 light dydrocarbons in the mixture I into a reforming unit together with reformate as reaction materials, and reacting to generate a mixture II; introducing C7-C10 in the mixture I into a transalkylation unit to react and generate a mixture III; feeding the mixtures II and III into a product separating unit, separating out C5-C6 components and returning to the reforming unit; returning the C7 component to the transalkylation unit, feeding C8 and the above components into a xylene tower; feeding C8 aromatics at the top of the xylene tower into a xylene adsorption unit to obtain a xylene product; and feeding components at the bottom of the tower into a heavy aromatic tower, separating out C9-C10 components and returning to the transalkylation unit. The problems are relatively well solved, and the method can be applied to industrial production of xylene.

Description

Technical field [0001] The invention relates to a method for diversifying raw materials to produce p-xylene. Background technique [0002] Use toluene and C9 and above heavy aromatics (C 9 + A) Transalkylation reaction to increase xylene production is a method to effectively use heavy aromatics to increase xylene production and is widely used. Industrial PX products are mainly produced through aromatics combined plants. The traditional aromatics unit involves reforming, transalkylation, isomerization, PX separation and other units, and PX is produced as a product. Among them, the reforming process is the formation of aromatics. The main raw material is naphtha, which is completed through many reactions, including: dehydrogenation of cycloalkanes to aromatics, dehydrocyclization of paraffins, isomerization of paraffins and cycloalkanes, Dealkylation of alkyl aromatics, hydrocracking of paraffins into light hydrocarbons. The resulting product is rich in benzene, toluene, xylene ...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C6/12C07C5/27C07C4/26C07C5/00
Inventor 李经球郭宏利孔德金杨德琴
Owner CHINA PETROLEUM & CHEM CORP
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