Method used for effective separation and purification of 2-methylnaphthalene from wash oil

A technology for methylnaphthalene and washing oil, which is applied in the field of effective separation and purification of 2-methylnaphthalene, can solve problems such as unsatisfactory yield, and achieve the effects of low preparation cost, simple operation, high purity and yield

Active Publication Date: 2019-02-01
PENG CHEN NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the 2-methylnaphthalene obtained by the above method has high purity, the yield is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for effectively separating and purifying 2-methylnaphthalene from wash oil, comprising the following steps:

[0023] (1) dissolving aluminum sulfate in deionized water to make a mass concentration of 20% aluminum sulfate solution; adding a mass concentration of 13% citric acid solution to the aluminum sulfate solution to make a mixed solution A; wherein, aluminum sulfate solution, The mass ratio of citric acid solution is 8:1;

[0024] (2) Sodium hydroxide and triethanolamine are dissolved in deionized water to prepare a mixed solution B; the mixed solution A is placed in the reactor, and the prepared mixed solution B is slowly added to the mixed solution A, after the addition is completed Slowly raise the temperature to 60-80°C, stir and react for 2 hours, then add silica sol, stir and mix, place the reactor in a hydrothermal oven, react at 150°C for 20 hours, cool to room temperature after the reaction, and add titanium into the reactor Acid tetrabutyl ester...

Embodiment 2

[0029] A method for effectively separating and purifying 2-methylnaphthalene from wash oil, comprising the following steps:

[0030] (1) dissolving aluminum sulfate in deionized water to make a mass concentration of 20% aluminum sulfate solution; adding a mass concentration of 13% citric acid solution to the aluminum sulfate solution to make a mixed solution A; wherein, aluminum sulfate solution, The mass ratio of citric acid solution is 8:1.5;

[0031] (2) Sodium hydroxide and triethanolamine are dissolved in deionized water to prepare a mixed solution B; the mixed solution A is placed in the reactor, and the prepared mixed solution B is slowly added to the mixed solution A, after the addition is completed Slowly raise the temperature to 60-80°C, stir and react for 6 hours, then add silica sol, stir and mix, place the reactor in a hydrothermal oven, react at 180°C for 30 hours, cool to room temperature after the reaction, and add titanium into the reactor Acid tetrabutyl est...

Embodiment 3

[0036] A method for effectively separating and purifying 2-methylnaphthalene from wash oil, comprising the following steps:

[0037] (1) dissolving aluminum sulfate in deionized water to make a mass concentration of 20% aluminum sulfate solution; adding a mass concentration of 13% citric acid solution to the aluminum sulfate solution to make a mixed solution A; wherein, aluminum sulfate solution, The mass ratio of citric acid solution is 8:1.1;

[0038] (2) Sodium hydroxide and triethanolamine are dissolved in deionized water to prepare a mixed solution B; the mixed solution A is placed in the reactor, and the prepared mixed solution B is slowly added to the mixed solution A, after the addition is completed Slowly raise the temperature to 60-80°C, stir and react for 3 hours, then add silica sol, stir and mix, place the reaction kettle in a hydrothermal oven, react at 160°C for 22 hours, cool to room temperature after the reaction, and add titanium into the reaction kettle Aci...

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PUM

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Abstract

The invention discloses a method used for effective separation and purification of 2-methylnaphthalene from wash oil. The method comprises following steps: firstly, a catalyst is prepared; a device composed of a rectifying tower A, an isomerization reactor, and a rectifying tower B is adopted to prepare a target product; wash oil fractions are introduced into the rectifying tower A for reduced pressure distillation so as to obtain a methylnaphthalene enriched solution, and the methylnaphthalene enriched solution is introduced into the isomerization reactor, the self-made catalyst is added forreaction, a liquid obtained through filtering is introduced into the rectifying tower B for reduced pressure distillation; and at last refrigeration crystallization, and squeezing are carried out so as to obtain object products. The method is simple in operation, and low in cost; the prepared solvent is high in storage stability, boiling point, and yield.

Description

technical field [0001] The invention relates to a method for preparing methylnaphthalene, in particular to a method for effectively separating and purifying 2-methylnaphthalene from washing oil. Background technique [0002] The washing oil fraction is the fraction cut from tar distillation with a distillation range of 230°C-300°C, and the yield is generally 4.5%-6.5% of that of anhydrous tar, of which mainly neutral components (accounting for about 90%), and the rest are alkaline , Acidic components. Washing oil is rich in valuable basic organic chemical raw materials such as quinoline, α-methylnaphthalene, β-methylnaphthalene, biphenyl, indole, acenaphthene, fluorene, etc. These products have broad development prospects. Because the washing oil component has good stability and good dissolving ability, it is mainly used to wash and absorb benzene group hydrocarbons and various organic gases in coke oven gas. Most of the rest are sold cheaply as fuel oil and raw materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/04C07C7/14C07C7/148C07C15/24B01J21/06B01J21/12B01J37/10B01J37/08
CPCB01J21/063B01J21/12B01J23/002B01J37/082B01J37/10C07C7/005C07C7/04C07C7/14C07C7/148C07C15/24
Inventor 谈勇谈俊江晓龙陈亮胡涛
Owner PENG CHEN NEW MATERIALS TECH CO LTD
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