A kind of method utilizing solid acid catalyst to remove trace olefins in aromatics

A solid acid catalyst and catalyst technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of catalyst pore blockage, catalyst deactivation, etc., and achieve catalytic performance recovery, regeneration performance, and reaction highly selective effect

Active Publication Date: 2022-06-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of method utilizing solid acid catalyst to remove trace olefins in aromatics
  • A kind of method utilizing solid acid catalyst to remove trace olefins in aromatics
  • A kind of method utilizing solid acid catalyst to remove trace olefins in aromatics

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Example 1: Preparation of ZrPO Mesoporous Zirconium Phosphate Molecular Sieve Catalyst

[0041] (1) Synthesis of ZrPO mesoporous zirconium phosphate molecular sieve: dissolve 57.6 g (4.57 mmol) of F127 in 600 mL of absolute ethanol, and stir at 40°C for 30 min to obtain an ethanolic solution of F127; 58.0 g (180.0 mmol) of oxychlorine Zirconium was dissolved in 300 mL of absolute ethanol, and stirred at 40°C for 30 minutes to obtain a zirconium oxychloride ethanol solution; then 20.2 g (144.2 mmol) of trimethyl phosphate was dissolved in 200 mL of absolute ethanol, and stirred at 40°C. 30min to obtain a trimethyl phosphate ethanol solution; under the temperature of 40 ° C and stirring conditions, the zirconium oxychloride ethanol solution and the trimethyl phosphate ethanol solution were added dropwise to the F127 ethanol solution in turn, and stirring was continued for 6h to obtain a total solute concentration of 0.3 mmol / mL mixture ethanol solution, its P and Zr molar...

Embodiment 2

[0043] Example 2: Al 0.25 Zr 0.75 Preparation of PO Mesoporous Zirconium Phosphate Molecular Sieve Catalyst

[0044] (1) Al 0.25 Zr 0.75Synthesis of PO mesoporous zirconium phosphate molecular sieve: Dissolve 63.0g (5.0mmol) F127 in 600mL absolute ethanol, stir at 30°C for 60min to obtain F127 ethanol solution; 43.5g (135.0mmol) zirconium oxychloride is used Dissolve 300 mL of anhydrous ethanol, stir at 30 °C for 60 min to obtain an ethanolic solution of zirconium oxychloride; dissolve 6.0 g (45.0 mmol) of anhydrous aluminum chloride in 150 mL of anhydrous ethanol, and stir at 30 °C for 60 min to obtain Aluminum chloride ethanol solution; then 18.9g (135.0mmol) trimethyl phosphate was dissolved in 150mL absolute ethanol, stirred at 30 ℃ for 60min to obtain trimethyl phosphate ethanol solution; under 30 ℃ temperature and stirring conditions, Add zirconium oxychloride ethanol solution, aluminum chloride ethanol solution, and trimethyl phosphate ethanol solution dropwise to F...

Embodiment 3

[0046] Example 3: Ca 0.05 Zr 0.95 Preparation of PO Mesoporous Zirconium Phosphate Molecular Sieve Catalyst

[0047] (1)Ca 0.05 Zr 0.95 Synthesis of PO mesoporous zirconium phosphate molecular sieve: Dissolve 126.0 g (10.0 mmol) F127 in 800 mL of absolute ethanol, and stir at 40°C for 30 min to obtain an ethanolic solution of F127; 43.5 g (135.0 mmol) of zirconium oxychloride was used Dissolve 300 mL of anhydrous ethanol, stir at 40 °C for 30 min to obtain a zirconium oxychloride ethanol solution; dissolve 0.79 g (7.1 mmol) of anhydrous calcium chloride in 100 mL of anhydrous ethanol, stir at 30 °C for 60 min to obtain Calcium chloride ethanol solution; then 18.9g (135.0mmol) trimethyl phosphate was dissolved in 100mL absolute ethanol, and stirred at 40°C for 30min to obtain trimethylphosphate ethanol solution; under 30°C temperature and stirring conditions, Add zirconium oxychloride ethanol solution, calcium chloride ethanol solution, and trimethyl phosphate ethanol solut...

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Abstract

The invention discloses a method for removing trace olefins in aromatic hydrocarbons by using a solid acid catalyst. ‑1 Under certain conditions, the liquid-phase aromatics are contacted with a solid acid catalyst, so that the trace olefins in the aromatics undergo alkylation and superimposition reactions, and the trace olefins in the aromatics are removed, thereby refining the aromatics and obtaining aromatics from which olefins have been removed The solid acid catalyst is a mesoporous zirconium phosphate molecular sieve catalyst or a modified mesoporous zirconium phosphate molecular sieve catalyst loaded with a modified compound; the solid acid catalyst prepared by the method of the present invention has high activity, and the removal rate is above 98%; the catalyst The activity stability is good, and the activity stability time exceeds 3000h; the reaction selectivity of aromatic hydrocarbon deolefination is high, C 8 The mass fraction of toluene refined from aromatics is less than 0.1%, which can avoid frequent switching operations of reactor reaction and regeneration.

Description

(1) Technical field [0001] 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 reacting with a solid acid catalyst. (2) Background technology [0002] Petrochemical enterprises mainly use catalytic reforming and aromatic extraction combined units to produce aromatics such as benzene, toluene and xylene. In the production process of aromatics, the bifunctional reforming catalyst will lead to the formation of a small amount of by-product olefins, and with the promotion of low-pressure reforming technology, the content of olefinic impurities in aromatics increases significantly. The active properties of these olefins not only easily form gums and affect product quality, but also lead to the failure of adsorbents for adsorption and separation, and the deactivation of catalysts such as toluene disproportionation and xylene isomerization, which brings difficulties to...

Claims

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Application Information

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Patent Type & Authority Patents(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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