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Toluene disproportionation and transalkylation catalyst and preparation method thereof

A technology of transalkylation and toluene disproportionation, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as reducing the loss rate of aromatic rings, and achieve the reduction of benzene ring loss, alleviation of aromatic ring loss, Highly selective effect

Active Publication Date: 2018-09-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it has not been found that the application of catalysts with specific structural characteristics to the disproportionation and transalkylation of toluene as described in the present invention can achieve the purpose of reducing the loss rate of aromatic rings

Method used

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  • Toluene disproportionation and transalkylation catalyst and preparation method thereof
  • Toluene disproportionation and transalkylation catalyst and preparation method thereof
  • Toluene disproportionation and transalkylation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The concentration of 3.9mL is 3.77g Pt / L of H 2 PtCl 6 The aqueous solution was poured into 300g ethylene glycol (EG) and stirred for 18h. Adjust the pH to 13.0 with NaOH EG solution (1 mol / L), blow in nitrogen gas, raise the temperature to 95°C, and keep it for 2h. After cooling down to room temperature, 10 g of hydrogen mordenite (SiO 2 / Al 2 o 3 The molar ratio was 25), stirred vigorously, and adjusted the pH of the solution to 1.0 with aqueous HCl (1mol / L) for 3h. After filtering, washing with water, drying at 120°C for 12h, and roasting in air (500°C, 3h), the solid product S1 was obtained.

[0045] The platinum content was determined to be 0.1 wt% by ICP analysis. figure 1 It is the transmission electron microscope figure after (500 ℃, 3h) reduction of gained product S1 of embodiment 1, it can be seen that the particle diameter of platinum metal nanoparticles is 2-5nm, the particle size distribution is narrow, and the particle diameter is larger than the p...

Embodiment 2

[0047] The concentration of 3.9mL is 3.77g Pt / L of H 2 PtCl 6 The aqueous solution was poured into a mixed solution of 220g ethylene glycol (EG) and 80g water, and stirred for 18h. Adjust the pH to 13.0 with EG solution of NaOH (1mol / L), raise the temperature to 95°C and keep it for 2h. After cooling down to room temperature, 10 g of hydrogen mordenite (SiO 2 / Al 2 o 3 The molar ratio was 25), stirred vigorously, and adjusted the pH of the solution to 1.0 with aqueous HCl (1mol / L) for 3h. Suction filtration, washing with water, drying at 120°C for 12h, and calcination at 500°C in air for 3h gave the solid product S2. The platinum content was determined to be 0.1 wt% by ICP analysis. The diameter of the platinum metal nanoparticles is 3-5nm.

Embodiment 3

[0049] The concentration of 3.9mL is 3.77g Pt / L of H 2 PtCl 6 The aqueous solution was poured into 300g ethylene glycol (EG) and stirred for 18h. Adjust the pH to 10.0 with NaOH EG solution (1 mol / L), blow in nitrogen gas, raise the temperature to 95°C, and keep it for 2h. After cooling down to room temperature, 10 g of hydrogen mordenite (SiO 2 / Al 2 o 3 The molar ratio was 25), stirred vigorously, and adjusted the pH of the solution to 1.0 with aqueous HCl (1mol / L) for 3h. After filtering, washing with water, drying at 120°C for 12h, and roasting in air (500°C, 3h), the solid product S3 was obtained.

[0050] The platinum content was determined to be 0.1 wt% by ICP analysis.

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Abstract

The invention relates to a toluene disproportionation and transalkylation catalyst and a preparation method thereof. A purpose of the present invention is mainly to solve the technical problems of high aromatic ring loss and high reaction hydrogen consumption of the catalyst in the prior art. According to the technical scheme, the catalyst contains a Group VIII metal, a silicon-aluminum molecularsieve and an inorganic binder, the content of the metal is 0.001-1.0 wt%, and the metal nanoparticles are selectively deposited on the outer surface of the molecular sieve. According to the present invention, with the application of the catalyst in the toluene disproportionation and transalkylation reaction, the aromatic ring loss rate and the reaction hydrogen consumption are significantly reduced, and the purity of the product benzene and the selectivity of benzene and xylene can be effectively improved.

Description

technical field [0001] The invention relates to a toluene disproportionation and transalkylation catalyst and a preparation method thereof, in particular to a catalyst with controllable particle size of active metal nanoparticles and selectively located on the outer surface of a molecular sieve and a preparation method thereof, which has the advantages of low benzene ring loss rate and low hydrogen consumption in reaction. Advantages of small size and high selectivity to benzene and xylene. Background technique [0002] Aromatics are important organic chemical raw materials, usually derived from the petrochemical industry. Among them, benzene and xylene mainly come from catalytic reforming, pyrolysis gasoline, and toluene disproportionation and transalkylation reactions. Among the three isomers of xylene, p-xylene (PX) is one of the important raw materials for petrochemical production, mainly used to produce purified terephthalic acid (PTA) or dimethyl terephthalate (DMT) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/22B01J29/24B82Y30/00C07C6/12C07C15/04C07C15/08
CPCB01J29/22B01J29/24B01J2229/186B82Y30/00C07C6/126C07C15/04C07C15/08Y02P20/52
Inventor 孔德金邓澄浩祁晓岚李经球
Owner CHINA PETROLEUM & CHEM CORP
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