Process for extracting 1-methylnaphthalene and 2-methylnaphthalene from tar

A technology of methyl naphthalene and tar, applied in the directions of organic chemistry, distillation purification/separation, etc., can solve the problems of large pollution, complicated equipment, complicated operation, complicated operation, etc., and achieve the effect of simple process and easy automatic operation.

Inactive Publication Date: 2008-06-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there is no serious pollution in azeotropic distillation, the recovery of expensive azeotropic agent greatly increases the cost of the product
[0005] The above-mentioned production methods all have the disadvantages of high cost, heavy pollution, or complex operations to varying degrees.
In particular, to produce high-purity 1-methylnaphthalene and 2-methylnaphthalene, it is necessary to add high-energy-consuming processes such as freezing and crystallization, and the equipment and operation are more cumbersome and complicated.

Method used

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  • Process for extracting 1-methylnaphthalene and 2-methylnaphthalene from tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] attached figure 1 Schematic diagram of the device for extracting 1-methylnaphthalene and 2-methylnaphthalene, combined with the attached figure 1 Described as follows:

[0020] Contain the coal tar washing oil of 61% of total methyl naphthalene, pump in the alkylation polymerization reactor from the raw material tank, add the solid acid SO of 6% raw material weight in the alkylation polymerization reactor 4 2- / ZrO 2 Catalyst, heat up to 75°C, feed isobutene within 1 hour, control the feed amount of isobutene to be 1% of the raw material weight, stop feeding isobutene, heat up to 100°C, continue to react for 1.5 hours, release the material, filter to remove the catalyst , the feed liquid enters the rectification tower 1, the operating pressure is 0.08MPa, the temperature at the bottom of the tower is 233±3°C, and the temperature at the top of the tower is 195±3°C. Light components with a boiling point less than 2-methylnaphthalene are extracted from the top of the r...

Embodiment 2

[0022] combined with figure 1 Described as follows:

[0023] Containing the petroleum tar washing oil of 73% of total methyl naphthalene, pump in the alkylation polymerization reactor from the raw material tank, add the vitriol oil of raw material weight 0.5% in the alkylation polymerization reactor, be warming up to 85 ℃, at 1 Feed methyl tert-butyl ether in one hour, control the feeding amount of methyl tert-butyl ether to be 3% of raw material weight, stop feeding methyl tert-butyl ether, be warming up to 110 ℃, continue reaction 2.5 hours, Add Ca(OH) 2 Neutralize, emit material, remove sediment by filtration, feed liquid enters rectifying tower 1, extract the light component with boiling point less than 2-methylnaphthalene at the tower top of rectifying tower 1, the material at the bottom of the tower is discharged into intermediate feed tank 1, The operating pressure is 0.08MPa, the temperature at the bottom of the tower is 233±3°C, and the temperature at the top of the...

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Abstract

The method of extracting 1-methyl naphthalene and 2-methyl naphthalene from tar includes adopting the production apparatus comprising one alkylating polymerization reactor and three serially connected rectification towers, and the production process, which comprises the alkylating polymerization reaction of material with methyl naphthalene content not lower than 60 %, solid acid and / or liquid acid catalyst and alkylation agent in 70-90 deg.c and 95-115 deg.c separately; the separation of the alkylating polymerization product in the first rectification tower to eliminate light distillation fraction from the tower top; the further separation in the second rectification tower to obtain 2-methyl naphthalene of 95 % over purity from the tower top; and the further separation in the third rectification tower to obtain 1-methyl naphthalene of 95 % over purity from the tower top. The present invention makes it possible to treat both tar scrubbing oil and coal tar scrubbing oil in the same apparatus.

Description

technical field [0001] The invention relates to a method for extracting 1-methylnaphthalene and 2-methylnaphthalene from tar, and is especially suitable for extracting high-purity 1-methylnaphthalene from petroleum cracking by-product tar wash oil or coal tar wash oil containing methylnaphthalene -Methylnaphthalene and 2-methylnaphthalene. Background technique [0002] Extracting 1-methylnaphthalene and 2-methylnaphthalene from coal tar wash oil has been the main method for producing 1-methylnaphthalene and 2-methylnaphthalene. In recent years, with the rapid increase of industrial demand for 1-methylnaphthalene and 2-methylnaphthalene, the extraction of 1-methylnaphthalene and 2-methylnaphthalene from petroleum cracking by-product tar has also received more and more attention. Pay attention to. [0003] The difference between the boiling points of 1-methylnaphthalene and 2-methylnaphthalene is only 3°C. It is very difficult to separate 1-methylnaphthalene and 2-methylnaph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/24C07C7/04
Inventor 张曾刘锋李崇张明非李雪王芳张大治宗麟博
Owner TIANJIN UNIV
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