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

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...

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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

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