Naphthalene-rich liquid based on single-layer porous titanium dioxide modified aluminium oxide catcher

A technology of porous titanium dioxide and alumina, which is applied in the field of naphthalene separation, can solve problems such as immature separation technology and affect product purity, achieve good trapping effect, increase specific surface area and sensitivity, and improve efficiency

Active Publication Date: 2018-08-24
PENG CHEN NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the comprehensive utilization of heavy aromatics mainly includes direct utilization and utilization after separation. Among them, the direct utilization method can be used to prepare solvent oil, extractant, aromatic resin, blended gasoline, etc., and the utilization after separation is the main utilization method of reforming heavy aromatics. The separated commodities can be directly commercialized, the resources are fully utilized, and the utilization rate is high, but the domestic separation technology is not mature
[0003] Methylnaphthalene is an important fine chemical raw material, mainly used in the production of vitamin K, polyester fiber dyeing carrier, fiber dyeing aid, wetting agent, plant growth inhibitor, feed additive, dye dispersant, cement water reducing and 2,6-naphthalene dicarboxylic acid, etc., but the naphthalene-enriched liquid separated and purified from reformed heavy aromatics contains impurities such as naphthalene, α-methylnaphthalene, β-methylnaphthalene, indole, thiazole, etc. affect the purity of the product

Method used

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  • Naphthalene-rich liquid based on single-layer porous titanium dioxide modified aluminium oxide catcher

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add aluminum hydroxide powder into water, mix evenly, add it into a high-pressure reactor with a polytetrafluoroethylene liner, conduct a hydrothermal reaction at 140°C for 3 hours, take it out and dry it to obtain pretreated aluminum hydroxide crystals, Then place it in a vacuum environment and decompose at 950°C for 1 hour to obtain flaky alumina powder.

[0028] (2) adding flake aluminum oxide powder to the titanium-containing precursor solution, wherein the components in the titanium-containing precursor solution include: 5wt% triblock polymer F127, 10wt% butyl phthalate , 0.6wt% hydrochloric acid and solvent, containing the tetrahydrofuran solution of ethanol / glycerol with a volume ratio of 75:5 in the solvent, after stirring evenly, transferred to a high-pressure reactor with a polytetrafluoroethylene liner, at 120 ° C Under hydrothermal reaction for 1 hour, alumina powder coated with titanium dioxide coating was obtained.

[0029] (3) Put the alumina powder ...

Embodiment 2

[0033] (1) Add aluminum hydroxide powder into water, mix evenly, add it into a high-pressure reactor with a polytetrafluoroethylene liner, conduct a hydrothermal reaction at 160°C for 6 hours, take it out and dry it to obtain pretreated aluminum hydroxide crystals, Then put it in a vacuum environment and decompose it at 1200°C for 3 hours to obtain flaky alumina powder.

[0034](2) Add flake aluminum oxide powder to the titanium-containing precursor solution, wherein the components in the titanium-containing precursor solution include: 8wt% triblock polymer F127, 15wt% butyl phthalate , 0.9wt% hydrochloric acid and solvent, containing the tetrahydrofuran solution of ethanol / glycerol with a volume ratio of 80:15 in the solvent, after stirring evenly, transferred to a high-pressure reactor with a polytetrafluoroethylene liner, at 140 ° C Under hydrothermal reaction for 4 hours, alumina powder coated with titanium dioxide was obtained.

[0035] (3) Put the alumina powder coated ...

Embodiment 3

[0039] (1) Add aluminum hydroxide powder into water, mix evenly, add it into a high-pressure reactor with a polytetrafluoroethylene liner, conduct a hydrothermal reaction at 150°C for 4 hours, take it out and dry it to obtain pretreated aluminum hydroxide crystals, Then put it in a vacuum environment and decompose at 1000°C for 2 hours to obtain flaky alumina powder.

[0040] (2) Add flake aluminum oxide powder to the titanium-containing precursor solution, wherein the components in the titanium-containing precursor solution include: 6wt% triblock polymer F127, 12wt% butyl phthalate , 0.7wt% hydrochloric acid and solvent, containing the tetrahydrofuran solution of ethanol / glycerol with a volume ratio of 78:10 in the solvent. Under hydrothermal reaction for 2 hours, alumina powder coated with titanium dioxide coating was obtained.

[0041] (3) Put the alumina powder coated with titania into the tube, heat-treat at 520°C for 1.5h, and place it in a vacuum system of 0.08MPa to f...

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Abstract

The invention provides a separation method for a naphthalene-rich liquid based on a single-layer porous titanium dioxide modified aluminium oxide catcher. The method comprises the following steps: after light-fraction distillates and a durene-rich liquid are separated from a C10 heavy aromatic raw material through primary distillation and condensation, reduced-pressure distillation is performed bycontrolling vacuum degree, tower top temperature and tower bottom temperature, a distilled gas phase is refluxed through condensation, an uncondensed gas phase is refluxed through catching by the single-layer porous titanium dioxide modified aluminium oxide catcher, and the naphthalene-rich liquid is obtained. A preparation method of the catcher comprises the following steps: aluminium hydroxidepowder is added to water for a hydrothermal reaction, a product is taken out and dried, pretreated aluminium hydroxide crystals are obtained and placed in a vacuum environment for pyrolysis, and flakyaluminium oxide powder is obtained; the flaky aluminium oxide powder is added to a titaniferous precursor liquor, a hydrothermal reaction is performed, and the aluminium oxide powder coated with a titanium dioxide coating is obtained; the aluminium oxide powder is fed to a tube, a template and gas are removed through heat treatment, the aluminium oxide powder is placed in the vacuum environment,and the single-layer porous titanium dioxide modified aluminium oxide catcher is formed.

Description

technical field [0001] The invention belongs to the technical field of naphthalene separation, and in particular relates to a naphthalene enrichment solution based on a single-layer porous titanium dioxide modified alumina trap. Background technique [0002] Heavy aromatics refers to the general term of C10 monocyclic, bicyclic or polycyclic aromatic hydrocarbons. Heavy aromatics mainly come from aromatics obtained by catalytic processing or thermal processing, and the main source is the by-product cracking of heavy aromatics from ethylene plants and the reformed heavy aromatics by-products of catalytic reforming. Among them, the reformed heavy aromatics include xylene, propylbenzene, methylethylbenzene, mesitylene, mesitylene, dimethylbenzene, mesitylene, naphthalene, methylnaphthalene, etc. The boiling point of the main components is between 150 and 250 °C , the boiling point of some raw materials is higher than 300°C. At present, the comprehensive utilization of heavy a...

Claims

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Application Information

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IPC IPC(8): C07C7/04C07C7/12C07C7/14C07C15/24B01D15/20
CPCB01D15/206C07C7/005C07C7/04C07C7/12C07C7/14C07C15/24
Inventor 谈勇谈俊江晓龙陈亮乔久昌
Owner PENG CHEN NEW MATERIALS TECH CO LTD
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