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Catalyst for toluene disproportionation and transalkylation, and preparation method thereof

A technology of transalkylation and toluene disproportionation, which is applied in the direction of carbon compound catalysts, physical/chemical process catalysts, catalysts, etc., can solve the problems of low conversion rate of heavy aromatics, high loss rate of benzene ring, and difficulty in reproducibility, etc.

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

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Problems solved by technology

However, it is difficult to fully guarantee the reproducibility of this type of pretreatment process, the emission or loss of sulfide is not conducive to environmental protection, and the operation steps of catalyst preparation and the cost of catalyst are also greatly increased
In addition, the presence of sulfur compounds in the reaction will cause an irreversible decline in the hydrogenation activity of the catalyst, resulting in problems such as low conversion of heavy aromatics or high loss of benzene rings

Method used

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  • Catalyst for toluene disproportionation and transalkylation, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Mordenite (MOR, SiO 2 / Al 2 o 3 Molar ratio 25) mixed with γ-alumina (the mass ratio is 80:20), add a certain amount of turnip powder, nitric acid and deionized water, knead and extrude. Dry at 120°C for 6 hours, then bake at 550°C for 3 hours, pelletize and sieve to obtain solid S1 (20-40 mesh).

Embodiment 2

[0038] 3.7ml of H 2 PtCl 6 (Concentration is 4.21g Pt / L) aqueous solution was poured into 400 g of ethylene glycol (EG), 10 g of the solid S1 obtained in Example 1 was added, the pH of the solution was adjusted to 6.0 with hydrochloric acid (1 mol / L), and stirred for 3 h. Nitrogen was blown in, the pH of the solution was adjusted to 13.0 with NaOH / EG solution (1 mol / L), the temperature was raised to 110° C., and the mixture was vigorously stirred and kept for 3 h. After cooling down to room temperature, the pH of the solution was adjusted to 2.0 with HCl, vigorously stirred and kept for 0.5 h. After filtering, washing with water and drying, it was calcined in air (500°C, 3h), and then activated in a hydrogen atmosphere (reduction at 500°C for 3h) to obtain catalyst S2.

Embodiment 3

[0040] 3.7ml of H 2 PtCl 6 (Concentration is 4.21g Pt / L) aqueous solution was poured in the mixed solution of 400g ethylene glycol-water (the specific gravity of water is 25wt%), added 10g solid S1, adjusted solution pH to 6.0 with hydrochloric acid (1mol / L), stirred 3h. Nitrogen was blown in, the pH of the solution was adjusted to 13.0 with NaOH / EG solution (1 mol / L), the temperature was raised to 110° C., and the mixture was vigorously stirred and kept for 3 h. After cooling down to room temperature, the pH of the solution was adjusted to 2.0 with HCl, vigorously stirred and kept for 0.5 h. After filtering, washing with water, and drying, it was calcined in air (500°C, 3h), and then activated in a hydrogen atmosphere (reduction at 500°C for 3h) to obtain catalyst S3.

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Abstract

The invention relates to a catalyst for toluene disproportionation and transalkylation, and a preparation method thereof. A purpose of the present invention is mainly to solve the technical problems of high aromatic ring loss rate and high reaction hydrogen consumption caused by excessive hydrogenation activity in the noble metal modified catalyst in the prior art. According to the present invention, the catalyst comprises a Group VIII metal, a silicon-aluminum molecular sieve and an inorganic alumina binder, the metal content is 0.005-0.5 wt%, the metal nanoparticles are positioned on the surface of the inorganic alumina, and the metal and the molecular sieve have good synergistic catalysis effect; and with the technical scheme, the technical problems of high aromatic ring loss rate and high reaction hydrogen consumption can be well solved.

Description

technical field [0001] The invention relates to a catalyst for disproportionation and transalkylation of toluene and a preparation method thereof, in particular to a catalyst with controllable particle size of active metal nanoparticles and selectively located on the surface of an alumina binder, and a preparation method thereof, which has benzene ring loss The advantages of low efficiency, low reaction hydrogen consumption and high selectivity of 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) , DMT can be used to syn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/22B01J29/24C07C6/12C07C15/04
CPCB01J29/22B01J29/24C07C6/126C07C2529/22C07C2529/24C07C15/04Y02P20/52
Inventor 孔德金邓澄浩祁晓岚李经球
Owner CHINA PETROLEUM & CHEM CORP
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