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Method for extracting naphthalene, 1-methylnaphthalene and 2-methylnaphthalene from ethylene tar

A technology for ethylene tar and methylnaphthalene, which is applied in the field of extracting high-purity naphthalene, 1-methylnaphthalene and 2-methylnaphthalene from petroleum cracking by-product tar, which can solve the problem of complex operation and uncertain products of alkylation reaction , a large amount of waste residue, waste water and other problems, to achieve the effect of easy automatic operation, conducive to environmental protection, and increase product content

Active Publication Date: 2013-05-15
广东新华粤石化集团股份公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, this scheme has obvious flaws
This scheme requires an alkylation reaction, and the operation of the alkylation reaction is complicated, and the product is uncertain, which brings unpredictable effects on subsequent processing and products
In addition, the removal of the catalyst used in the alkylation reaction will produce a large amount of waste residue and waste water, which will cause environmental pollution.

Method used

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  • Method for extracting naphthalene, 1-methylnaphthalene and 2-methylnaphthalene from ethylene tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] refer to figure 1 , containing naphthalene and methyl naphthalene total 30% ethylene cracking tar, pumped from the raw material storage tank 4 through the first feed heat exchanger 3 into the middle part of the first rectification tower 5, the operating pressure of the rectification tower 5 is 0.10 MPa, tower bottom temperature 238±2°C, tower top temperature 198±2°C, at the top of the rectification tower 5, light components with a boiling point lower than naphthalene are extracted through the first condensing reflux device 1, and enter the component storage tank 2 , the tower bottom material enters the first intermediate storage tank 9.

[0022] The material in the first intermediate storage tank 9 is pumped through the second feed heat exchanger 8 into the middle of the second rectification column 10 . The operating pressure at the top of the second rectifying tower 10 is 0.09MPa, the temperature at the bottom of the tower is 238 ± 2°C, and the temperature at the top ...

Embodiment 2

[0028] refer to figure 1 , containing naphthalene and methyl naphthalene total 30% ethylene cracking tar, pumped from the raw material storage tank 4 through the first feed heat exchanger 3 into the middle of the first rectification tower 5, the first rectification tower 5 tower top operation The pressure is 0.08MPa, the temperature at the bottom of the tower is 222±2°C, and the temperature at the top of the tower is 182±2°C. At the top of the first rectification tower 5, light components with a boiling point lower than naphthalene are extracted through the first condensing reflux device 1, and enter the light The component storage tank 2, the bottom material enters the first intermediate storage tank 9.

[0029] The material in the first intermediate storage tank 9 is pumped through the second feed heat exchanger 8 into the middle of the second rectification column 10 . The operating pressure at the top of the second rectifying tower 10 is 0.07MPa, the temperature at the bot...

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Abstract

The invention discloses a method for extracting naphthalene, 1-methylnaphthalene and 2-methylnaphthalene from ethylene tar. The method comprises the following steps of: adding ethylene cracking tar with the total content of naphthalene and methylnaphthalene of not less than 30 percent from the middle of a first rectifying tower (5) under certain conditions; recovering materials of which light components are removed by the first rectifying tower at the bottom of the tower; adding from the middle of a second rectifying tower (10), and obtaining the naphthalene with the purity of not less than 95 percent on the top of the tower; adding the materials of which the naphthalene is removed at the bottom of the second rectifying tower from the middle of a third rectifying tower (15), and removing tetramethyl benzene and other components of which the boiling point is lower than that of the 2-methylnaphthalene at the top of the tower; recovering the materials of which the light fraction is removed by the third rectifying tower at the bottom of the tower, adding from the middle of a fourth rectifying tower (20), and obtaining the 2-methylnaphthalene with the purity of not less than 98 percenton the top of the tower; and recovering the materials of which the 2-methylnaphthalene is removed by the fourth rectifying tower at the bottom of the tower, adding from the middle of a fifth rectifying tower (25), and obtaining the 1-methylnaphthalene with the purity of not less than 98 percent. By the method, wastewater and waste residue are not generated and extraction efficiency is high.

Description

technical field [0001] The invention relates to a method for extracting naphthalene, 1-methylnaphthalene and 2-methylnaphthalene, which is especially suitable for extracting high-purity naphthalene, 1-methylnaphthalene, and 1-methylnaphthalene from petroleum cracking by-product tar containing naphthalene and methylnaphthalene components Naphthalene and 2-methylnaphthalene. Background technique [0002] Both naphthalene and methylnaphthalene are important chemical raw materials. Methylnaphthalene has two isomers, 1-methylnaphthalene and 2-methylnaphthalene. The extraction of naphthalene, 1-methylnaphthalene and 2-methylnaphthalene from coal tar wash oil has been the main method for producing naphthalene, 1-methylnaphthalene and 2-methylnaphthalene. In recent years, with the rapid increase of industrial demand for naphthalene, 1-methylnaphthalene and 2-methylnaphthalene, the extraction of naphthalene, 1-methylnaphthalene and 2-methylnaphthalene from ethylene cracking by-prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10C1/12
Inventor 张曾阚一群刘峰于星玉何开刘阳姜亦波
Owner 广东新华粤石化集团股份公司
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