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

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

Inactive Publication Date: 2006-01-18
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 oper

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] Attached figure 1 In order to extract the schematic diagram of 1-methylnaphthalene and 2-methylnaphthalene, the attached figure 1 Described as follows:

[0020] The coal tar washing oil containing 61% of the total methylnaphthalene is pumped from the raw material tank to the alkylation polymerization reactor, and the solid acid SO of 6% by weight of the raw material is added to the alkylation polymerization reactor. 4 2- / ZrO 2 The catalyst is heated to 75°C, and isobutylene is introduced within 1 hour. The amount of isobutylene is controlled to be 1% of the weight of the raw material. The introduction of isobutylene is stopped, the temperature is raised to 100°C, and the reaction is continued for 1.5 hours. The material is released and the catalyst is removed by filtration. , The feed liquid enters the rectification tower 1, the operating pressure is 0.08 MPa, the bottom temperature is 233±3℃, and the top temperature is 195±3℃. At the top of the rectifi...

Example Embodiment

[0021] Example 2

[0022] Attached figure 1 Described as follows:

[0023] Petroleum tar wash oil containing 73% of the total methylnaphthalene is pumped from the raw material tank to the alkylation polymerization reactor, and 0.5% of the raw material weight concentrated sulfuric acid is added to the alkylation polymerization reactor, and the temperature is increased to 85°C. Feed in methyl tert-butyl ether within hours, control the feed amount of methyl tert-butyl ether to 3% of the raw material weight, stop feeding methyl tert-butyl ether, raise the temperature to 110°C, and continue the reaction for 2.5 hours. Add Ca(OH) 2 Neutralize, discharge the material, filter to remove the sludge, the material liquid enters the rectification tower 1, the light component with a boiling point less than 2-methylnaphthalene is extracted at the top of the rectification tower 1, and the bottom material is discharged into the intermediate tank 1. The operating pressure is 0.08MPa, the bottom tem...

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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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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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