Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of preparation method of high-purity 1-methylnaphthalene

A methylnaphthalene, high-purity technology, applied in chemical instruments and methods, purification/separation of hydrocarbons, organic chemistry, etc., can solve problems such as low extraction rate and waste of raw materials, and achieve the effect of improving purity

Active Publication Date: 2020-05-05
PENG CHEN NEW MATERIALS TECH CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the extraction of α-methylnaphthalene and β-methylnaphthalene from industrial methylnaphthalene fractions mainly adopts the methods of distillation, crystallization and suction filtration, that is, the industrial methylnaphthalene fractions are directly immersed in a rectification tower for rectification. Product purity, according to the different crystallization points of α-methylnaphthalene and β-methylnaphthalene, is purified in the crystallizer. This process has the defects of waste of raw materials and low extraction rate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The preparation method of the high-purity 1-methylnaphthalene of the present invention comprises the following steps: (a) adding industrial methylnaphthalene fractions into an acidic solution for pickling, standing and stratifying to obtain the first organic layer; (b) The first organic layer is added to an alkaline solution for alkali washing, and the second organic layer is obtained by standing and layering; (c) adding ethanethiol, metal halides and catalysts to the second organic layer for reflux reaction; The mass ratio of the second organic layer, ethanethiol, metal halide and catalyst is 100:80~150:1~5:0.5~2; the catalyst is a mixture of copper oxide and aluminum oxide, and its mass ratio is 1: 1~3; (d) The product of step (c) can be filtered and rectified. The industrial methylnaphthalene distillate is acid-washed and alkali-washed successively, and reflux reaction is carried out in ethanethiol, metal halide and catalyst, so that the selective removal of 2-methyl...

Embodiment 1

[0022] The present embodiment provides a kind of preparation method of high-purity 1-methylnaphthalene, it comprises the following steps:

[0023] (a) Add industrial methylnaphthalene fractions (mainly containing 1-methylnaphthalene, 2-methylnaphthalene, quinoline and indole) to a sulfuric acid solution with an excess mass concentration of 10% (usually industrial methylnaphthalene and its volume ratio are 1:5~10), pickling at 40°C, standing for stratification, discarding the water layer to obtain the first organic layer;

[0024] (b) Add the organic layer to a sodium bicarbonate solution with a mass concentration of 5% for alkali washing at 70°C to make it close to neutral (the test paper does not change color), let it stand for layers, and discard the water layer to obtain the second Two organic layers;

[0025] (c) Add ethanethiol, metal halide and catalyst to the second organic layer for reflux reaction (reflux temperature is about 40°C); the mass ratio of the second organ...

Embodiment 2

[0028] The present embodiment provides a kind of preparation method of high-purity 1-methylnaphthalene, it comprises the following steps:

[0029] (a) Add industrial methylnaphthalene fractions (mainly containing 1-methylnaphthalene, 2-methylnaphthalene, quinoline and indole) to a sulfuric acid solution with an excess mass concentration of 30% (usually industrial methylnaphthalene and its volume ratio are 1: 1~3), carry out pickling under the condition of 60 ℃, let stand for stratification, discard the water layer to get the first organic layer;

[0030] (b) Add the organic layer to a sodium bicarbonate solution with a mass concentration of 10% for alkali washing at 90°C to make it close to neutral (the test paper does not change color), let it stand for layers, and discard the water layer to obtain the second Two organic layers;

[0031] (c) Add ethanethiol, metal halide and catalyst to the second organic layer for reflux reaction (reflux temperature is about 40°C); the mass...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
flash pointaaaaaaaaaa
Login to View More

Abstract

The invention relates to a preparation method of high-purity 1-methylnaphthalene. The preparation method comprises the steps that (a) technical methylnaphthalene fraction is added to an acid solution for acid pickling, and standing layering is performed to obtain a first organic layer; (b) the first organic layer is added to an alkaline solution for alkaline washing, and standing layering is performed to obtain a second organic layer; (c) ethanethiol, metal halide and a catalyst are added to the second organic layer for reflux reaction; the mass ratio of the second organic layer, the ethanethiol, the metal halide and the catalyst is 100:(80-150):(1-5):(0.5-2); the catalyst is a mixture of copper oxide and aluminium trioxide, and the mass ratio of the copper oxide and the aluminium trioxide is 1:(1-3); (d) the product of the step (3) is filtered and rectified so that the high-purity 1-methylnaphthalene is obtained. Accordingly, 2-methylnaphthalene can be selectively removed, and the purity of the 1-methylnaphthalene is improved greatly.

Description

technical field [0001] The invention relates to a preparation method of oil agent methylnaphthalene, in particular to a preparation method of high-purity 1-methylnaphthalene. Background technique [0002] 1-Methylnaphthalene (that is, α-methylnaphthalene) is a colorless oily liquid with a naphthalene-like odor that can volatilize with steam. It is flammable, insoluble in water, and easily soluble in ether and ethanol; its relative density (20°C) 1.025, boiling point 245°C and flash point 82.2°C. Methylnaphthalene is the main raw material for the production of disperse dye auxiliaries (dispersants). It can also be used as a heat carrier and solvent, a surfactant, a sulfur extraction agent, and can also be used to produce plasticizers and fiber dyeing aids. It can also be used to determine alkane value and cetane number of standard fuels. [0003] At present, the extraction of α-methylnaphthalene and β-methylnaphthalene from industrial methylnaphthalene fractions mainly adop...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/00C07C15/24
CPCC07C7/005C07C15/24
Inventor 谈勇谈俊江晓龙乔久昌张惠根
Owner PENG CHEN NEW MATERIALS TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com