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Process for extracting high-purity β-methylnaphthalene from reformed aromatics C10

A process method, technology of methyl naphthalene, applied in chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbons, etc., can solve the problems of low yield, complicated process, high cost, etc., and achieve high product purity and low cost , high economic and social benefits

Inactive Publication Date: 2015-11-04
天津市兴源化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is complex in process, uses a large amount of solvent, has high cost and low yield

Method used

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  • Process for extracting high-purity β-methylnaphthalene from reformed aromatics C10
  • Process for extracting high-purity β-methylnaphthalene from reformed aromatics C10
  • Process for extracting high-purity β-methylnaphthalene from reformed aromatics C10

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] will reform aromatics C 10 50t of raw materials are continuously passed into the rectification tower with corrugated screen high-efficiency packing (model CY-700Y), the vacuum degree is controlled at 0.095Mpa, and the methylnaphthalene fraction is obtained at the top of the tower, with a distillation range of 235 - 254°C, β-methylnaphthalene content 53.4156wt%, α - The content of methylnaphthalene is 26.1324wt%, and the content of naphthalene is 0.2328wt%. - Between 5°C, the refined components are obtained by separating them with a centrifuge, the content of β-methylnaphthalene is 82.2567wt%, and the refined components are passed into a continuous multi-stage countercurrent fractional crystallizer, and the crystallization temperature is - Between 35°C, 1.52t of finished β-methylnaphthalene was obtained after refining, the content of β-methylnaphthalene was 99.2461wt%, and the yield of β-methylnaphthalene was 22.79%.

[0026] Among them: the refined components are pass...

Embodiment 2

[0028] will reform aromatics C 10 50t of raw materials are continuously passed into the rectification tower with corrugated wire mesh high-efficiency packing (model CY-700Y), the vacuum degree is controlled at 0.095Mpa, and the methylnaphthalene fraction is obtained at the top of the tower, with a distillation range of 237 - 255°C, β-methylnaphthalene content 55.0937wt%, α - The content of methylnaphthalene is 25.7332wt%, and the content of naphthalene is 0.1841wt%. - Between 10°C, the refined components are obtained by centrifuge separation, the content of β-methylnaphthalene is 83.4622wt%, and the refined components are passed into a continuous multi-stage countercurrent fractional crystallizer, and the crystallization temperature is 23 - Between 33°C, 1.61t of finished β-methylnaphthalene was obtained after refining, the content of β-methylnaphthalene was 99.073wt%, and the yield of β-methylnaphthalene was 24.14%.

Embodiment 3

[0030] will reform aromatics C 10 50t of raw material is continuously passed into the rectification tower with corrugated wire mesh high-efficiency packing (model CY-700Y), the vacuum degree is controlled at 0.095Mpa, and the methylnaphthalene fraction is obtained at the top of the tower, with a distillation range of 236 - 253°C, β-methylnaphthalene content 54.232wt%, α - The content of methylnaphthalene is 27.5347wt%, and the content of naphthalene is 0.1966wt%. - Between 10°C, the refined component was obtained by centrifuge separation, the content of β-methylnaphthalene was 83.2531wt%, and the refined component was passed into a continuous multi-stage countercurrent fractional crystallizer, and the crystallization temperature was 22 - Between 34°C, 1.58t of finished β-methylnaphthalene was obtained after refining, the content of β-methylnaphthalene was 99.1463wt%, and the yield of β-methylnaphthalene was 23.69%.

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Abstract

The invention relates to a process method for extracting high-purity beta-methylnaphthalene from reformed aromatic hydrocarbon C10. The process method comprises the following steps of: by taking catalytically reformed by-product hydrocarbon C10 as a raw material and refined components as raw materials after carrying out rectification, freezing crystallization and refining on the catalytically reformed by-product hydrocarbon C10, putting the raw materials into a multistage countercurrent fractional crystallizer, and refining and extracting the beta-methylnaphthalene, so as to obtain the beta-methylnaphthalene with the purity high than 99%. The process method has the advantages of simple process, relatively low equipment investment and production cost, no polluted by-product and relatively high economic benefit and social benefit.

Description

technical field [0001] The present invention relates to a kind of reforming aromatics C 10 A process for extracting high-purity β-methylnaphthalene from China to catalytically reform the by-product aromatics C 10 It is a process of extracting high-purity β-methylnaphthalene after rectification, freezing crystallization and refining. Background technique [0002] β-Methylnaphthalene is a white crystal with a naphthalene-like odor and is mainly used in the production of vitamin K 3 , can also be used as raw materials for fine chemical products such as pesticides, pharmaceutical intermediates, dyes, etc., and has a wide range of applications in the field of fine chemicals. [0003] β-Methylnaphthalene is usually extracted from coal tar washing oil fractions, but because coal tar has complex components and contains acidic and alkaline substances, it needs to be extracted after acid-base washing. The entire extraction process is complicated and cumbersome, which is not conduciv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/24C07C7/00
Inventor 王明辉刘玉江刘海瑞
Owner 天津市兴源化工有限公司