Purifying process of beta-methylnaphthalene

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...

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 addition of high-concentration sulfuric acid to the methylnaphthalene component. , to remove indole by its strong acidity, but due to the high viscosity of indole and high adhesion in the product, if concentrated sulfuric acid is used for treatment, the contact surface with indole is extremely small during treatment, and the treatment efficiency is low, and it is necessary to use Only a large amount of concentrated sulfuric acid can be removed, which causes a great increase in the treatment cost. At the same time, due to the strong oxidizing property of concentrated sulfuric acid, the purity of β-methylnaphthalene will be affected during treatment, and a large amount of concentrated sulfuric acid waste liquid will also be produced. A large amount of manpower and material resources are required for harmless treatment, and a large amount of acidic wastewater will be generated. Therefore, this method not only has low removal efficiency, but also brings unnecessary troubles to subsequent treatment.