Purifying process of beta-methylnaphthalene

A purification process, technology of methylnaphthalene, which is applied in the field of purification process of β-methylnaphthalene, can solve the problems affecting the purity, difficulty, and troublesome handling of β-methylnaphthalene, and achieve the reduction of the consumption of concentrated sulfuric acid, better society and Economic benefits, the effect of reducing the cost of treatment

Inactive Publication Date: 2010-12-01
莱芜雅鲁生化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] β-Methylnaphthalene is a white to light yellow monoclinic crystal or molten liquid. It is insoluble in water but soluble in organic solvents such as ethanol and ether. It is generally used as a surfactant, water reducing agent, Dispersants, medicines and other organic synthetic insecticides, medicines, dye intermediates, etc., but when they are used as raw materials for further processing and production, some parameters need to be strictly controlled, and in daily production, the obtained β- Methylnaphthalene contains a large amount of viscous indole with poor fluidity, and indole is an imine with weak alkalinity and high viscosity, so it causes the defect of poor fluidity. Due to their existence, it seriously affects Purity of β-methylnaphthalene, and its further processing and use
[0003] In the prior art, because β-methylnaphthalene also contains other impurities, it is generally difficult to handle. The existing technology for processing β-methylnaphthalene generally adopts the add

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] First put β-methylnaphthalene into the washing system and add sodium hydroxide solution to it simultaneously, stir and make it mix evenly, so that the added sodium hydroxide accounts for 2% of the mass fraction in the mixture in the whole reaction tank, and simultaneously use The dilute sulfuric acid with a weight fraction of 15% is configured in the acid preparation tank, and then the adjusted β-methylnaphthalene is washed to remove indole with the above-mentioned configuration acid solution. When adding acid to the washing system, attention should be paid to the operating temperature control. The temperature should not exceed 70°C, and the acid addition process should be slow and uniform, until the quality index of β-methylnaphthalene is washed out and the indole content is less than 1wt%.

[0015] The indole in the final distilled beta-methylnaphthalene product can be reduced to 0.6 wt% by washing, and the yield of the finished product from the washed beta-methylnapht...

Embodiment 2

[0018] At first beta-methylnaphthalene is squeezed into washing system and adds sodium hydroxide solution in it simultaneously, stirs and makes it mix evenly, makes the sodium hydroxide that adds accounts for the mass fraction allotment of 6% in the mixture in the whole reaction tank, at the same time Use dilute sulfuric acid with a weight fraction of 30% in the acid preparation tank, and then use the above-mentioned configuration acid solution to wash the adjusted β-methylnaphthalene to remove indole, and pay attention to operating temperature control when adding acid to the washing system , the temperature should not exceed 70°C, and the acid addition process should be slow and uniform, until the quality index of β-methylnaphthalene is washed out and the indole content in it is less than 0.1wt%.

[0019] The indole in the final distilled beta-methylnaphthalene product can be reduced to 0.05 wt% by washing, and the yield of the finished product from the washed beta-methylnapht...

Embodiment 3

[0021] First put β-methylnaphthalene into the washing system and add quinoline liquid into it at the same time, stir to make it mix evenly, so that the added quinoline accounts for 10% of the mass fraction in the mixture in the entire reaction tank, and simultaneously use acid The dilute sulfuric acid with a weight fraction of 37% is configured in the tank, and then the adjusted β-methylnaphthalene is washed and removed by using the above-mentioned acid solution to remove indole. When adding acid to the washing system, attention should be paid to the operating temperature control. When the temperature is higher than 70°C, the acid addition process should be slow and uniform, until the quality index of β-methylnaphthalene is washed out and the indole content is less than 0.2wt%.

[0022] The finished product of β-methylnaphthalene through the above-mentioned washing is washed again according to the above-mentioned same conditions, and the indole in the finished product of β-meth...

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PUM

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Abstract

The invention relates to a purifying process, in particular to the purifying process of beta-methylnaphthalene, which adopts the way of adding alkali for regulation, thereby changing the viscosity of indole, leading the indole to be capable of being reacted with acid solution for removing an indole impurity in a finished product of the beta-methylnaphthalene, further improving the product purity of the beta-methylnaphthalene and leading the beta-methylnaphthalene to be in line with the requirements in industrial production; simultaneously, the adoption of the process can greatly reduce the amount of waste water in acid oil in the finally obtained wastes, thereby not only achieving the requirements on environmental protection, but also saving the wastewater treatment cost of enterprises and reducing the production cost.

Description

technical field [0001] The invention belongs to the field of organic chemistry and relates to a purification process, in particular to a purification process of β-methylnaphthalene. Background technique [0002] β-Methylnaphthalene is a white to light yellow monoclinic crystal or molten liquid. It is insoluble in water but soluble in organic solvents such as ethanol and ether. It is generally used as a surfactant, water reducing agent, Dispersants, medicines and other organic synthetic insecticides, medicines, dye intermediates, etc., but when they are used as raw materials for further processing and production, some parameters need to be strictly controlled, and in daily production, the obtained β- Methylnaphthalene contains a large amount of viscous indole with poor fluidity, and indole is an imine with weak alkalinity and high viscosity, so it causes the defect of poor fluidity. Due to their existence, it seriously affects The purity of β-methylnaphthalene, as well as it...

Claims

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Application Information

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IPC IPC(8): C07C15/24C07C7/00
Inventor 谢业链吴江华
Owner 莱芜雅鲁生化有限公司
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