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A method for efficiently separating and purifying 1-methylnaphthalene

A methylnaphthalene, high-efficiency technology, applied in chemical instruments and methods, purification/separation of hydrocarbons, crystallization purification/separation, etc., to achieve the effect of increased yield, low price and high activity

Active Publication Date: 2021-08-24
PENG CHEN NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the yield of the same product needs further improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for efficiently separating and purifying 1-methylnaphthalene, comprising the following steps:

[0026] (1) Dissolve the magnesium-based hydrotalcite material in an aqueous solution of polyethylene glycol, slowly raise the temperature to 40-50°C, stir and mix for 1 hour, then cool to room temperature, and filter to obtain a polyethylene glycol-modified magnesium-based hydrotalcite material ; Wherein, the mass ratio of magnesium-based hydrotalcite material to polyethylene glycol is 4:0.13;

[0027] (2) Prepare sodium edetate solution, add the polyethylene glycol-modified magnesium-based hydrotalcite material prepared above, stir and mix for 20 minutes at 4000 rpm, then add zinc chloride, stir until the solid dissolves, A dispersion is obtained; the dispersion is concentrated and then vacuum-dried to obtain a catalyst; wherein, the mass ratio of sodium edetate, polyethylene glycol-modified magnesium-based hydrotalcite material, and zinc chloride is 0.3:2:0.5 ;

...

Embodiment 2

[0032] A method for efficiently separating and purifying 1-methylnaphthalene, comprising the following steps:

[0033] (1) Dissolving the magnesium-based hydrotalcite material in an aqueous solution of polyethylene glycol, slowly raising the temperature to 40-50° C., stirring and mixing for 5 hours, cooling to room temperature, and filtering to obtain a polyethylene glycol-modified magnesium-based hydrotalcite material; Among them, the mass ratio of magnesium-based hydrotalcite material to polyethylene glycol is 4:0.16;

[0034] (2) Prepare sodium edetate solution, add the polyethylene glycol-modified magnesium-based hydrotalcite material prepared above, stir and mix for 60 minutes at 7000 rpm, then add zinc chloride, stir until the solid dissolves, A dispersion is obtained; the dispersion is concentrated and then vacuum-dried to obtain a catalyst; wherein, the mass ratio of sodium edetate, polyethylene glycol-modified magnesium-based hydrotalcite material, and zinc chloride i...

Embodiment 3

[0039] A method for efficiently separating and purifying 1-methylnaphthalene, comprising the following steps:

[0040] (1) Dissolve the magnesium-based hydrotalcite material in an aqueous solution of polyethylene glycol, slowly raise the temperature to 40-50°C, stir and mix for 1.5 hours, then cool to room temperature, and filter to obtain polyethylene glycol-modified magnesium-based hydrotalcite Material; Wherein, the mass ratio of magnesium-based hydrotalcite material, polyethylene glycol is 4:0.14;

[0041] (2) Prepare sodium edetate solution, add the polyethylene glycol-modified magnesium-based hydrotalcite material prepared above, stir and mix for 30 minutes at 4500 rpm, then add zinc chloride, stir until the solid dissolves, A dispersion is obtained; the dispersion is concentrated and vacuum-dried to obtain a catalyst; wherein, the mass ratio of sodium edetate, polyethylene glycol-modified magnesium-based hydrotalcite material, and zinc chloride is 0.35:2:0.5 ;

[0042...

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PUM

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Abstract

The invention discloses a method for efficiently separating and purifying 1-methylnaphthalene, which specifically includes the following steps: firstly, using magnesium-based hydrotalcite material as a raw material, using polyethylene glycol for surface modification, and then adding sodium EDTA , zinc chloride is modified to obtain a catalyst; the naphthalene oil fraction is desulphurized and preliminarily distilled, the fraction at 230-270 ° C is collected, the catalyst is added to the fraction to react, the filtrate is collected, and it is subjected to intermittent vacuum distillation. , collect the crystallizable fraction at 237-241°C and the non-crystallizable fraction at 241-245°C, freeze the crystallizable fraction at -10--20°C, centrifuge, and collect the filtrate; The concentrated sulfuric acid with a concentration of 95-98% is washed, washed with alkali neutralization, and the water is removed. Finally, the fraction less than 241° C. is removed by fractional distillation in a distillation column, and the crystallization is removed by freezing at a low temperature to obtain 1-methylnaphthalene. The method is simple to operate, and the obtained product has high yield and high purity.

Description

technical field [0001] The invention relates to the field of preparation of methylnaphthalene, in particular to a method for efficiently separating and purifying 1-methylnaphthalene. Background technique [0002] 1-Methylnaphthalene, colorless oily liquid, has a smell similar to naphthalene, insoluble in water, soluble in most organic solvents such as ethanol and ether. Store in a cool, ventilated warehouse. Keep away from fire and heat sources. The storage temperature should not exceed 32°C, and the relative humidity should not exceed 80%. 1-Methylnaphthalene can be used as a raw material for organic synthesis such as surfactants, water reducers, dispersants, and drugs. It can be used as a printing and dyeing carrier for polyvinyl chloride fiber and polyester, as a heat carrier and solvent, as a surfactant, as an extraction agent for sulfur, and as a raw material for the production of plasticizers and fiber dyeing aids. [0003] At present, the preparation method of 1-m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/26C07C7/00C07C7/04C07C7/14C07C15/24
CPCB01J31/26C07C7/005C07C7/04C07C7/14C07C15/24
Inventor 谈勇谈俊江晓龙
Owner PENG CHEN NEW MATERIALS TECH CO LTD