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Method for the separation and production of p-xylene

A technology of p-xylene and mixed xylene, which is applied in the production of bulk chemicals, chemical instruments and methods, and purification/separation of chemical changes. Reduce energy consumption and equipment investment scale, reduce production costs, and reduce overall energy consumption

Active Publication Date: 2016-06-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the technical problems of large xylene separation unit and isomerization unit aromatics treatment circulation, harsh requirements for reaction raw materials, low yield, high energy consumption and high cost in the prior art when p-xylene is produced, the present invention The purpose is to provide a new method for the separation and production of p-xylene

Method used

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  • Method for the separation and production of p-xylene
  • Method for the separation and production of p-xylene
  • Method for the separation and production of p-xylene

Examples

Experimental program
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Effect test

Embodiment 1

[0030] according to figure 1 The flow chart shown is to catalyze the carbon eight aromatics (C 8 A) The composition of each substance is used as the basic data to investigate the ability of the present invention to produce p-xylene and the composition of the process stream of each unit. C sent from a typical reformer 8 The composition distribution of A and the logistics composition of each component used in this embodiment are shown in Table 1.

[0031] The mixed xylene selective isomerization-selective hydrogenation process unit uses a fixed-bed reactor, and the inner diameter of the reactor is mm, length 1000 mm, stainless steel. The upper and lower sides of the catalyst bed are filled with quartz sand for air distribution and support. The reactor is filled with composite catalyst A. The reaction conditions are: reaction temperature 400°C, reaction pressure 5.0MPa, hydrogen-to-hydrocarbon ratio (V / V) 450, liquid The mass space velocity is 4h -1. The mixed xylene raw m...

Embodiment 2

[0038] according to figure 1 The flow shown is based on C in pyrolysis oil 8 The composition of each substance of A is the basic data, and the ability of the present invention to produce p-xylene and the composition of the process stream of each unit are investigated. C in typical pyrolysis oil 8 The composition distribution of A and the logistics composition of each component used in this embodiment are shown in Table 2.

[0039] Table 2 embodiment 2 process stream composition table

[0040]

Embodiment 3

[0042] according to figure 1 The flow shown is C in coal tar 8 The composition of each substance of A is the basic data, and the ability of the present invention to produce p-xylene and the composition of the process stream of each unit are investigated. C in typical coal tar 8 The composition distribution of A and the logistics composition of each component used in this embodiment are shown in Table 3.

[0043] Table 3 Embodiment 3 process stream composition table

[0044]

[0045]

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Abstract

The present invention relates to a method for the separation and production of p-xylene by using mixed xylenes (BTX) for isomerization-selective hydrogenation coupling reaction to generate 1,4-dimethylcyclohexane and then 1,4 - Dimethylcyclohexane and unreacted BTX enter the rectification tower to separate unreacted mixed xylenes and circulate them to the reaction feed, and 1,4-dimethylcyclohexane undergoes dehydrogenation reaction to obtain p-xylene. The method of the invention uses mixed xylene as a raw material to separate and produce p-xylene, and has the advantages of simple process, low device energy consumption, and high p-xylene production efficiency and yield.

Description

technical field [0001] The present invention relates to the technical field of petrochemical industry, more specifically, the present invention relates to a kind of method for separating and producing p-xylene. Background technique [0002] P-xylene is an important petrochemical basic raw material. After oxidation of p-xylene, terephthalic acid can be obtained, and terephthalic acid can be further synthesized into important synthetic polyester fibers and plastic raw materials. P-xylene is also widely used in the fields of medicine, pesticides, dyes and solvents. However, in aromatic raw materials from various sources, the content of p-xylene is relatively low, accounting for only 4.2% in pyrolysis gasoline, 7.5% in reformed oil, and 22-26% in C8 mixed aromatics. Therefore, maximizing the acquisition of high value-added p-xylene has always been an important research direction in petrochemical technology. At the same time, due to the mixed xylenes (p-xylene, m-xylene, ortho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/08C07C7/148C07C5/367
CPCY02P20/52
Inventor 柴永明吴仪岚刘晨光郭海玲段斐刘杜鹏刘宾
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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