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A method for preparing low-naphthalene and high-boiling-point solvents by cracking and hydrogenating aromatic solvents based on honeycomb-shaped supported catalysts

A technology of supported catalysts and high boiling point solvents, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve problems such as the safety impact of solvent oils, and achieve naphthalene Low content, simple operation, good continuity effect

Active Publication Date: 2021-12-28
连云港鹏辰特种新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solvent contains naphthalene, which is carcinogenic and has a certain impact on the safety of solvent oil. Therefore, it is necessary to remove naphthalene from the solvent oil after hydrocracking.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 5g of plant shell fiber is pulverized and ground through a 120 mesh sieve, and then placed in 50ml of 5% sodium hydroxide solution at 80°C for 2 hours and filtered; the precipitate obtained by filtration and 0.1g of carbon Ultrasonic dispersion of nanotubes in a mixed solution of sodium hydroxide and ammonium hydroxide with a mass concentration of 20% (the mass ratio of sodium hydroxide and ammonium hydroxide is 1:1) was ultrasonically dispersed for 25min at a power of 500W, and carried out at -5°C. Refrigerated for 20 hours to obtain a gel;

[0028] (2) Thaw the above gel at room temperature and immerse it in absolute ethanol for replacement for 24 hours. After the replacement, freeze it at -20°C for 24 hours, and finally carry out vacuum freeze-drying at -40°C and 15Pa for 20 hours to obtain cellulose fibers. Airgel / carbon nanotube composite material; then put it in a muffle furnace, first raise the temperature to 150°C at a rate of 10°C / min, heat it for 10 minute...

Embodiment 2

[0034] (1) 5g of plant shell fibers were pulverized and ground through a 150-mesh sieve, and then placed in 50ml of 8% sodium hydroxide solution at 90°C for 5 hours and filtered; the precipitate obtained by filtration and 0.1g of carbon The nanotubes were ultrasonically dispersed for 45min under the power of 1000W in a mixed solution of sodium hydroxide and ammonium hydroxide with a mass concentration of 20% (the mass ratio of sodium hydroxide and ammonium hydroxide was 1:1), and carried out at -4°C. Refrigerated for 24 hours to obtain a gel;

[0035] (2) Thaw the above gel at room temperature and immerse it in absolute ethanol for replacement for 24 hours. After the replacement, freeze it at -15°C for 24 hours, and finally carry out vacuum freeze-drying at -50°C and 20Pa for 30 hours to obtain cellulose fibers. Airgel / carbon nanotube composite material; then put it in a muffle furnace, first raise the temperature to 150°C at a rate of 10°C / min, heat it for 15 minutes, and the...

Embodiment 3

[0041] (1) 5g of plant shell fiber is pulverized and ground through a 120 mesh sieve, and then placed in 50ml of 8% sodium hydroxide solution at 90°C for 3 hours and filtered; the precipitate obtained by filtration and 0.1g of carbon Ultrasonic dispersion of nanotubes in a mixed solution of sodium hydroxide and ammonium hydroxide with a mass concentration of 20% (the mass ratio of sodium hydroxide and ammonium hydroxide is 1:1) was ultrasonically dispersed for 30min at a power of 600W, and carried out at -5°C Refrigerated for 21 hours to obtain a gel;

[0042] (2) Thaw the above gel at room temperature and immerse it in absolute ethanol for replacement for 24 hours. After the replacement, freeze it at -20°C for 24 hours, and finally carry out vacuum freeze-drying at -40°C and 15Pa for 20 hours to obtain cellulose fibers. Airgel / carbon nanotube composite material; then put it in a muffle furnace, first raise the temperature to 150°C at a rate of 10°C / min, heat it for 10 minutes...

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Abstract

The invention discloses a method for preparing a low-naphthalene high-boiling-point solvent by cracking and hydrogenating aromatic solvent based on a honeycomb-shaped supported catalyst. The method is characterized in that: firstly, the C 10 + The heavy aromatic hydrocarbon solvent is catalytically hydrogenated through a fixed-bed reactor loaded with a hydrogenation catalyst; then the gas-liquid is separated, and the separated liquid is pumped into the rectification tower for separation, and the bottom fraction is collected; the collected fraction is pumped into Naphthalene removal is carried out in a fixed-bed separator equipped with a porous alumina-supported separation layer to obtain a low-naphthalene high-boiling solvent; the hydrogenation catalyst is a sulfonated honeycomb-shaped porous carbon aerogel / carbon nanotube The composite material is used as the carrier, with nickel and molybdenum as the active components; the separation layer supported by the porous alumina is made of porous alumina as the support, and the surface is coated with β-cyclodextrin / ionic liquid sieve membrane . The method has simple operation and good continuity, and the prepared solvent has high boiling point, low naphthalene content and high yield.

Description

Technical field: [0001] The invention relates to the field of petroleum processing, in particular to a method for preparing low-naphthalene and high-boiling-point solvents by cracking and hydrogenating aromatic hydrocarbon solvents based on honeycomb-shaped supported catalysts. Background technique: [0002] C 10 Heavy aromatics are by-products of petroleum and coal processing, mainly from catalytic reforming units of refineries and wide-fraction catalytic reforming units of polyester raw material plants, and a small part from ethylene tar and coal high-temperature coking by-products of ethylene units and other production equipment. C 10 Heavy aromatics are an important chemical raw material with a complex composition and as many as 150 components. Although the content of each component varies with the production process parameters and actual operating conditions, its main components and content are basically stable. And the main production enterprises have formulated cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28B01J31/06B01J31/02B01J35/04B01J35/10C10G7/00
CPCB01J31/28B01J31/06B01J31/0291B01J35/04B01J35/1004C10G7/00
Inventor 江晓龙谈勇谈俊
Owner 连云港鹏辰特种新材料有限公司
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