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Method for separating methylnaphthalene enrichment liquid from mixed C10 heavy aromatic composition

A methylnaphthalene enrichment solution and methylnaphthalene enrichment technology, which is applied to the purification/separation of hydrocarbons and hydrocarbons, crystallization purification/separation, etc., can solve the problem of low yield, prevent thermal cracking, improve Stability, effect of improving oxidation resistance and heat resistance

Inactive Publication Date: 2018-08-03
PENG CHEN NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Known from above-mentioned prior art, can improve the purity of β-methyl naphthalene by changing the mode of rectification and the mode of crystallization, but productive rate is not high, can only reach 40%

Method used

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  • Method for separating methylnaphthalene enrichment liquid from mixed C10 heavy aromatic composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Remove the heavy carbon decaaromatics from durene, naphthalene and low carbon decaaromatic solvents, and distill under reduced pressure at a tower top temperature of 132°C, a tower bottom temperature of 198°C, and a vacuum of -0.009MPa 60min, the obtained methylnaphthalene enrichment liquid, according to the mass ratio of methylnaphthalene enrichment liquid and graphene, ethanolamine is 1:0.001:0.05, adds the ethanolamine containing graphene, mixes uniformly, forms the formazan modified by graphene base naphthalene enrichment solution.

[0027] (2) Transfer the graphene-modified methylnaphthalene-enriched liquid to a reboiler, and reboil the methylnaphthalene-enriched liquid at a vacuum of -0.0085MPa in a batch vacuum rectification system , the temperature at the top of the tower is 80°C, the temperature at the bottom of the tower is 150°C, the absolute pressure at the top of the tower is 20KPa, the reflux ratio is 1:5, vacuum distillation is 40min, and the unconden...

Embodiment 2

[0031](1) Remove heavy carbon decaaromatics from durene, naphthalene and low carbon decaaromatic solvents, and distill under reduced pressure under the condition that the temperature at the top of the tower is 133°C, the temperature at the bottom of the tower is 200°C, and the degree of vacuum is -0.009MPa 80min, the obtained methylnaphthalene enrichment liquid, according to the mass ratio of methylnaphthalene enrichment liquid and graphene, ethanolamine is 1:0.003:0.1, adds the ethanolamine containing graphene, mixes evenly, forms the formazan modified by graphene base naphthalene enrichment solution.

[0032] (2) Transfer the graphene-modified methylnaphthalene-enriched liquid to a reboiler, and reboil the methylnaphthalene-enriched liquid at a vacuum of -0.0085MPa in a batch vacuum rectification system , the temperature at the top of the tower is 85°C, the temperature at the bottom of the tower is 155°C, the absolute pressure at the top of the tower is 50KPa, the reflux rat...

Embodiment 3

[0036] (1) Remove durene, naphthalene and low-carbon deca-aromatic hydrocarbons as solvents, and distill under reduced pressure at a tower top temperature of 132.5°C, a tower bottom temperature of 199°C, and a vacuum of -0.009MPa 70min, the obtained methylnaphthalene enrichment liquid, according to the mass ratio of methylnaphthalene enrichment liquid and graphene, ethanolamine is 1:0.002:0.06, adds the ethanolamine containing graphene, mixes uniformly, forms the formazan modified by graphene base naphthalene enrichment solution.

[0037] (2) Transfer the graphene-modified methylnaphthalene-enriched liquid to a reboiler, and reboil the methylnaphthalene-enriched liquid at a vacuum of -0.0085MPa in a batch vacuum rectification system , the temperature at the top of the tower is 82°C, the temperature at the bottom of the tower is 153°C, the absolute pressure at the top of the tower is 40KPa, the reflux ratio is 1:6, vacuum distillation is 50min, and the uncondensed gas phase is ...

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Abstract

The invention provides a method for separating methylnaphthalene enrichment liquid form mixed C10 heavy aromatic composition. The method comprises the following steps that vacuum distillation is conducted on heavy C10 aromatic which durene, naphthalene and a low C10 aromatic solvent are removed, methylnaphthalene enrichment liquid is obtained, ethanol amine containing graphene is added and mixed to be uniform, and methylnaphthalene enrichment liquid modified by graphene is obtained; the methylnaphthalene enrichment liquid modified by graphene is transferred into a reboiler, reboiling is conducted by adopting an intermittent vacuum rectification system at the vacuum degree of -0.009MPa, and primary purification is conducted through vacuum rectification under the condition that the tower toptemperature is 80-85 DEG C and the tower bottom temperature is 150-155 DEG C; reboiling is conducted at the vacuum degree of -0.009MPa, vacuum distillation is conducted under the condition that the tower top temperature is 115-120 DEG C and the tower bottom temperature is 140-145 DEG C, and secondary purification is conducted; and finally, the product is placed in a FLC liquid film crystallizer filled with a filling material containing a micronano fiber composite material, cooling and crystallization are conducted for 2-4 hours at the temperature of -15 to -25 DEG C, squeezing and sweating are conducted, and the finished product of methylnaphthalene is obtained.

Description

technical field [0001] The invention belongs to the technical field of separation of carbon deca-heavy aromatics, and in particular relates to a method for separating methylnaphthalene-enriched liquid from a mixed carbon deca-heavy aromatics composition. Background technique [0002] Methylnaphthalene consists of two isomers, namely α-methylnaphthalene and β-methylnaphthalene. Methylnaphthalene can be used as a medicine and surfactant, and can also be used to prepare mesophase pitch or carbon fiber. Among them, α-methylnaphthalene Base naphthalene can be used to prepare vinyl chloride fiber and polyester printing and dyeing carrier surfactant, heat carrier, pharmaceutical intermediate, sulfur extractant, plasticizer and fiber dyeing aid, β-methyl naphthalene can be used to prepare vitamin K3, polyester fiber Chromosome carriers, fiber dyeing aids, organic pigments, concrete additives, detergents, emulsifiers, hemostatic agents, wetting agents, plant growth regulators, bevera...

Claims

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Application Information

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IPC IPC(8): C07C15/24C07C7/06C07C7/04C07C7/14
CPCC07C7/005C07C7/04C07C7/06C07C7/14C07C15/24
Inventor 谈勇谈俊江晓龙乔久昌陈亮
Owner PENG CHEN NEW MATERIALS TECH CO LTD
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