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Method for removing tiny amount of olefins in aromatic hydrocarbons by using solid acid catalyst

A solid acid catalyst, catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of catalyst pore blockage, catalyst deactivation, etc., to optimize reaction conditions, improve activity and activity stability sexual effect

Active Publication Date: 2020-02-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research of patent CN 105413758 A shows that in the deene refining process with alumina and Y-type molecular sieve as the main component catalyst, metals such as Fe and Ni in the raw oil will gradually deposit on the catalyst, and the coke generated will also deposit on the catalyst. , leading to blockage of the catalyst pores and gradual deactivation of the catalyst

Method used

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  • Method for removing tiny amount of olefins in aromatic hydrocarbons by using solid acid catalyst
  • Method for removing tiny amount of olefins in aromatic hydrocarbons by using solid acid catalyst
  • Method for removing tiny amount of olefins in aromatic hydrocarbons by using solid acid catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: Preparation of ZrPO mesoporous zirconium phosphate molecular sieve catalyst

[0046] (1) Synthesis of ZrPO Mesoporous Zirconium Phosphate Molecular Sieve: Dissolve 57.6g (4.57mmol) of F127 in 600mL of absolute ethanol, stir at 40℃ for 30min to obtain F127 ethanol solution; add 58.0g (180.0mmol) of oxygen chloride The zirconium was dissolved in 300 mL of absolute ethanol, and stirred at 40°C for 30 minutes to obtain an ethanol solution of zirconium oxychloride; then 20.2 g (144.2 mmol) of trimethyl phosphate was dissolved in 200 mL of absolute ethanol and stirred at 40°C 30min, obtain trimethyl phosphate ethanol solution; under 40℃ temperature and stirring conditions, add zirconium oxychloride ethanol solution and trimethyl phosphate ethanol solution dropwise to F127 ethanol solution, continue to stir for 6h to obtain total solute concentration 0.3 A mixture of mmol / mL ethanol solution, the molar ratio of P to Zr n P / n Zr =0.8, F127 and P+Zr molar ratio n F127 / ...

Embodiment 2

[0048] Example 2: Al 0.25 Zr 0.75 Preparation of PO Mesoporous Zirconium Phosphate Molecular Sieve Catalyst

[0049] (1)Al 0.25 Zr 0.75 Synthesis of PO Mesoporous Zirconium Phosphate Molecular Sieve: Dissolve 63.0g (5.0mmol) of F127 in 600mL of absolute ethanol, and stir at 30°C for 60min to obtain F127 ethanol solution; use 43.5g (135.0mmol) of zirconium oxychloride Dissolve in 300 mL of absolute ethanol, stir at 30°C for 60 minutes to obtain an ethanol solution of zirconium oxychloride; dissolve 6.0 g (45.0 mmol) of anhydrous aluminum chloride in 150 mL of absolute ethanol, and stir at 30°C for 60 minutes to obtain Aluminum chloride ethanol solution; then 18.9g (135.0mmol) of trimethyl phosphate was dissolved in 150mL of absolute ethanol, and stirred at 30°C for 60min to obtain a trimethyl phosphate ethanol solution; at 30°C under stirring conditions, The ethanol solution of zirconium oxychloride, the ethanol solution of aluminum chloride, and the ethanol solution of trimethyl ...

Embodiment 3

[0051] Example 3: Ca 0.05 Zr 0.95 Preparation of PO Mesoporous Zirconium Phosphate Molecular Sieve Catalyst

[0052] (1)Ca 0.05 Zr 0.95 Synthesis of PO Mesoporous Zirconium Phosphate Molecular Sieve: Dissolve 126.0g (10.0mmol) of F127 in 800mL of absolute ethanol, stir at 40℃ for 30min to obtain F127 ethanol solution; use 43.5g (135.0mmol) of zirconium oxychloride Dissolve in 300 mL of absolute ethanol and stir at 40°C for 30 min to obtain an ethanol solution of zirconium oxychloride; dissolve 0.79 g (7.1 mmol) of anhydrous calcium chloride in 100 mL of absolute ethanol, and stir at 30°C for 60 min to obtain Calcium chloride ethanol solution; then 18.9g (135.0mmol) of trimethyl phosphate was dissolved in 100mL of absolute ethanol, and stirred at 40°C for 30 min to obtain trimethyl phosphate ethanol solution; at 30°C under stirring conditions, The ethanol solution of zirconium oxychloride, the ethanol solution of calcium chloride, and the ethanol solution of trimethyl phosphate we...

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Abstract

The invention discloses a method for removing a tiny amount of olefins in aromatic hydrocarbon by using a solid acid catalyst. Liquid-phase aromatic hydrocarbons contact and react with the solid acidcatalyst at a temperature of 100-300 DEG C under a pressure of 0.2-10 MPa and a feeding mass space velocity of 0.2-15 h<-1> to carry out alkylation and superposition reactions on the tiny amount of olefins in the aromatic hydrocarbons in order to remove the tiny amount of olefins in the aromatic hydrocarbons, refine the aromatic hydrocarbons and obtain olefin-removed aromatic hydrocarbons; the solid acid catalyst is a meso-porous zirconium phosphate molecular sieve catalyst or a modified mesoporous zirconium phosphate molecular sieve catalyst loaded with a modifying compound; the solid acid catalyst prepared by the method has a high activity, and the olefin removal rate is 98% or above; the catalyst has a good activity stability, and the activity stabilization time exceeds 3000 h; and theselectivity of the reaction for removing olefins from aromatic hydrocarbons is high, and the generation mass fraction of toluene refined by C8 aromatic hydrocarbons is less than 0.1%, and frequent switching operation of reactor reaction and regeneration can be avoided.

Description

[0001] (1) Technical field [0002] The invention relates to a method for removing trace olefins in aromatic hydrocarbons, in particular to a method for removing trace olefins in aromatic hydrocarbons by reaction using a solid acid catalyst. [0003] (2) Background technology [0004] Petrochemical companies mainly use catalytic reforming and aromatic extraction combined units to produce aromatics such as benzene, toluene and xylene. In the aromatics production process, the dual-functional reforming catalyst will cause the formation of a small amount of by-product olefins, and with the promotion of low-pressure reforming technology, the content of olefin impurities in aromatics has increased significantly. These olefins are active in nature, not only easy to form gums and affect product quality, but also cause the failure of the adsorbent for adsorption and separation, and the deactivation of catalysts such as toluene disproportionation and xylene isomerization, which brings difficul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/84C10G55/06
CPCB01J29/84C10G55/06B01J2229/186C10G2400/30
Inventor 任杰刘冰邓优金辉
Owner ZHEJIANG UNIV OF TECH
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