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Shape-selective catalyst for efficient alkylation of light aromatic hydrocarbon and methanol

A light aromatic hydrocarbon and catalyst technology, applied in the field of shape-selective catalysts, can solve the problems of poor technical economy, low xylene yield, low stability, etc., and achieve high p-xylene yield, high methanol alkylation efficiency, The effect of long service life

Inactive Publication Date: 2020-01-24
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a shape-selective catalyst for efficient alkylation of light aromatics and methanol and its application method, to solve the problem of methanol alkylation in the existing light aromatics and methanol shape-selective alkylation reaction proposed in the background art. Low conversion efficiency, low p-xylene yield, low stability, and poor technical and economical efficiency

Method used

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  • Shape-selective catalyst for efficient alkylation of light aromatic hydrocarbon and methanol
  • Shape-selective catalyst for efficient alkylation of light aromatic hydrocarbon and methanol
  • Shape-selective catalyst for efficient alkylation of light aromatic hydrocarbon and methanol

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] 1) Weigh 6g of nano-flaky HZSM-11 / HZSM-5 mixed crystal molecular sieve with flaky crystal thickness of 80nm and silicon-aluminum atomic molar ratio of 5 and mix with 4g of alumina binder. After stirring evenly, add an appropriate amount of dilute Kneading with nitric acid, extruding into rods, drying at room temperature, and calcining at 500° C. for 1 hour to obtain rod-shaped catalysts with a cross-sectional diameter of 1.5 mm. Then the unmodified catalyst particle of above-mentioned gained molding is excessively impregnated 12 hours in the magnesium nitrate solution of certain concentration, and the loading capacity of magnesia is determined to be 20wt% of the total weight of unmodified catalyst by the liquid absorption amount and solution concentration of unmodified catalyst , the impregnated sample was dried at 120°C for 6 hours, and then calcined at 500°C for 1 hour to obtain a 20wt% MgO-modified nanosheet HZSM-11 / HZSM-5 molecular sieve catalyst.

[0024] 2) Put 5 ...

Embodiment 2

[0032] 1) Weigh 10g of nano-acicular HZSM-11 / HZSM-5 mixed crystal molecular sieve with a silicon-aluminum atomic molar ratio of 500 and acicular crystal section diameter of 100nm, and 9g of a silicon-aluminum atomic molar ratio of 2 and a flaky crystal thickness of Mix 3nm nanosheet HZSM-11 / HZSM-22 mixed crystal molecular sieves, then add 1g of silica binder, roll into balls, dry at room temperature, and bake at 500°C for 1 hour to obtain a spherical shape with a diameter of 1.5mm. Catalyst particles. Then, the above-mentioned shaped unmodified catalysts were sequentially immersed in a certain concentration of lanthanum nitrate, iron nitrate and boric acid aqueous solution for 12 hours, and the lanthanum oxide, iron oxide and three were determined by the liquid absorption and solution concentration of the unmodified catalyst. The loads of diboron oxide were respectively 10wt%, 15wt% and 15wt% of the total weight of the unmodified catalyst, and the impregnated samples were drie...

Embodiment 3

[0040] 1) Weigh 8g of nano-flaky HZSM-11 / HZSM-22 mixed crystal molecular sieve with a silicon-aluminum atomic molar ratio of 200 and a flaky crystal thickness of 400nm, and 6g of a silicon-aluminum atomic molar ratio of 40 and acicular crystal cut-off diameter of 300nm nanoacicular HZSM-11 / HZSM-22 mixed crystal molecular sieves are mixed, and then 6g of silica binder is added, kneaded, extruded, dried at room temperature, and roasted at 500°C for 1 hour to obtain the cross-sectional diameter 1.5mm strip catalyst particles. Then the above-mentioned shaped unmodified catalyst particles were successively immersed in a certain concentration of cerium nitrate, ammonium dihydrogen phosphate and nickel nitrate aqueous solution for 12 hours, and the cerium oxide, The loadings of phosphorus pentoxide and nickel element (nickel oxide form) are respectively 5wt%, 4wt% and 1wt% of the total weight of the unmodified catalyst, and the samples after each impregnation are all dried at 120°C f...

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Abstract

The invention discloses a shape-selective catalyst for efficient alkylation of light aromatic hydrocarbon and methanol, and an application method thereof. The shape-selective catalyst comprises a hydrogen-type short-pore mixed crystal molecular sieve with a special morphology, a binder and a modifying aid, wherein the weight percentage of the hydrogen-type short-pore mixed crystal molecular sievewith the special morphology is 60-95 wt%, and the weight percentage of the binder is 5-40 wt%; and the content of the modifying aid is 10-40% of the total weight of the molecular sieve and the binder.The catalyst is used for the alkylation reaction of the light aromatic hydrocarbon and methanol to generate p-xylene. Compared with catalysts in the prior art, the catalyst of the invention, which isthe short-pore shape-selective catalyst, has the advantages of high selectivity to p-xylene, high methanol alkylation efficiency, long service life, effectiveness in improvement of the light aromatichydrocarbon conversion rate, the methanol utilization rate and the p-xylene yield, reduction of the catalyst regeneration and replacement frequency, and substantial improvement of the technical economical property of the synthesis route.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a shape-selective catalyst for efficient alkylation of light aromatics and methanol and an application method thereof. Background technique [0002] As the most important basic raw material of bulk aromatic hydrocarbons today, p-xylene is mainly used in the synthesis of polyester, and is also widely used in the fields of pesticides, dyes, and medicine. With the continuous high-speed development of polyester industry and fine chemical industry, the demand for p-xylene is increasing rapidly year by year. At present, its main commercial production methods are xylene isomerization separation and toluene shape-selective disproportionation. These two processes have the problems of low yield of p-xylene and low utilization rate of toluene raw materials respectively. The shape-selective alkylation of light aromatics (benzene and / or toluene) and methanol to p-xylene catalyz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80C07C2/86C07C15/08
CPCB01J29/80C07C2/864B01J29/40B01J29/7684B01J29/7484B01J29/46B01J29/44C07C2529/80Y02P20/584Y02P20/52
Inventor 李军辉宋剑红龚清
Owner XIANGTAN UNIV
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