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Process for the separation of diethylbenzene in carbon deka-aromatic hydrocarbons

A carbon ten aromatic hydrocarbon and separation method technology, applied in the field of separation of diethylbenzene, can solve the problems of not finding an efficient adsorbent desorbent, large investment, etc., and achieve good separation effect and thermal stability, low energy consumption, and product purity. high effect

Active Publication Date: 2009-01-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of the adsorption method are outstanding, that is, stable operation and high product purity; the disadvantage is that the investment is large, and no efficient adsorbent and corresponding desorbent have been found.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1.C 10 Initial separation of mixed diethylbenzene in heavy aromatics

[0014] To C 10 The heavy aromatics reformate raw material undergoes initial fractionation to separate the diethylbenzene component. Some main parameters of the rectification experimental device: rectification column type: packed column with vacuum sleeve for heat insulation; packing material: 2mm θ ring; rectification column size: 30mm×1.5m; kettle capacity: 3000ml; adopts intermittent precision Distillation method, normal pressure operation. Heating and distilling the raw materials in the tower kettle, a condenser is installed on the top of the tower, and the reflux ratio is controlled by a reflux ratio controller. At the beginning, use total reflux and rapid heating to make the liquid in the tower boil quickly. After there is reflux liquid on the top of the tower, adjust the heating power of the tower to make the tower top temperature and reflux stable, and the weight ratio of reflux to outflow is 15:1...

Embodiment 2

[0022] 1.C 10 Initial separation of mixed diethylbenzene in heavy aromatics

[0023] The rectification experiment device is the same as in Example 1. The weight ratio of reflux to outflow is 3:1, and the recovery rate is 30 g / hour. The fractions in the range of 178-182°C were collected, and the content of mixed diethylbenzene was 84.2% by weight.

[0024] 2. Extractive distillation

[0025] The experimental device for extractive distillation is the same as in Example 1. The extractant is dibutyl phthalate: the flow rate is 300 g / h. The feed temperature is ~180℃, the feed position is the upper half of the tower; the raw material concentration: the content of mixed diethylbenzene is 84.2% (weight), the flow rate is 60 g / h, the feed temperature is 150℃, and the feed position is extraction The lower half of the rectification column.

[0026] The mixture of extractant, p-diethylbenzene and a small amount of m-diethylbenzene flows out from the bottom of the column. The m-diethylbenzene ...

Embodiment 3

[0030] 1.C 10 Initial separation of mixed diethylbenzene in heavy aromatics

[0031] The rectification experiment device is the same as in Example 1. The weight ratio of reflux to outflow is 30:1, and the recovery rate is 30 g / h. The fractions in the range of 178-182°C are collected, and the separated mixed diethylbenzene content is 92.5% by weight.

[0032] 2. Extractive distillation

[0033] The experimental device for extractive distillation is the same as in Example 1. The extractant is a mixture of dimethyl phthalate and dibutyl phthalate, and the weight ratio is 1:1: flow rate 800 g / h. The feeding temperature is ~180℃, the feeding position is the upper half of the tower; the raw material concentration: mixed diethylbenzene 92.5% (weight), the flow rate is 40 g / h, the feeding temperature is 150°C, and the feeding position is the extractive distillation column The bottom half.

[0034]The mixture of extractant, p-diethylbenzene and a small amount of m-diethylbenzene flows out ...

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PUM

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Abstract

The invention relates to a method for utilizing an extractive distillation process to separate diethyl benzene from C10 arene, comprising: firstly, mixed components of meta-diethyl benzene in C10 arene and other high boiling point components are separated off, with a rectification temperature of between 176 and 182DEG C; then an extractant is added in a meta-diethyl benzene mixture for separating out m-diethyl benzene, wherein, the extractant is dimethyl phthalate, dibutyl phthalate or a mixture thereof; and the extractant and the mixed components of meta-diethyl benzene have a feeding weight ratio of 5 to 20:1, the charging temperature of the extractant is between 120 and 190 DEG C, and the separation temperature is 160 to 190 DEG C; and finally the extractant and the p-diethyl benzene are separated for recovering the extractant through distillation separation; and the method has advantages of simple process, stable operation, low energy consumption, high purity of separated products, good separation effect and thermal stability of extractant, economy and acquirability, and the p-diethyl benzene content can reach over 98 percent, and the m-diethyl benzene content can reach above 70 percent.

Description

Technical field [0001] The invention relates to a method for separating diethylbenzene from carbon deca aromatic hydrocarbons by extractive distillation. Background technique [0002] With the continuous development of the oil refining industry, it comes from the wide fraction catalytic reformer C of the polyester raw material plant 10 The amount of heavy aromatics is also increasing substantially, and the development of heavy aromatics separation technology is becoming more and more important. Especially for C 10 The separation technology of about 12% of the diethylbenzene in the raw materials needs to be further improved. Although C 10 The composition of heavy aromatics is very complex, and the content of each component changes continuously with the changes of its production process parameters and actual operating conditions, but its main components and their content are basically stable, and are also C 10 The separation, purification and comprehensive utilization of heavy arom...

Claims

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Application Information

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IPC IPC(8): C07C15/02C07C7/04C07C7/10
Inventor 刘键杜建卫黄奋生张卫星陈季敏
Owner PETROCHINA CO LTD
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