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Method for preparing aromatic hydrocarbon by methyl alcohol at high selectivity

A high-selectivity, methanol technology, applied in the field of aromatics, can solve the problems of catalyst promoter metal sintering, reduced catalyst activity, poor catalyst stability, etc., to achieve the effect of promoting the selectivity of aromatics, improving the selectivity of aromatics, and good stability

Active Publication Date: 2017-06-20
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In most reactions, as the reaction proceeds, carbon deposits occur on the catalyst, which covers the acid active centers on the catalyst, resulting in a decrease in catalyst activity, and even metal sintering of catalyst promoters, resulting in poor catalyst stability and shortened life.

Method used

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  • Method for preparing aromatic hydrocarbon by methyl alcohol at high selectivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 2.0g Cu(NO 3 ) 2 ·3H 2 O, join in 30g absolute ethanol and carry out ultrasonic dispersion, the time is 4h; Weigh the Zn ion-modified H-beta zeolite molecular sieve of 3.0g (Zn content is 0.5wt%), join in the above-mentioned solution, continue ultrasonication 5h; The mixture after ultrasonic dispersion was suction-filtered and washed, and the resulting filter cake was moved to a vacuum drying oven for 24 hours at 80°C; the resulting sample was moved to a tube furnace, and mixed with NO / Ar containing 10% NO by volume gas, heated at a rate of 2°C / min to 550°C for 6 hours; the calcined samples were 2 / Ar atmosphere was reduced for 4 hours at 400°C (heating rate: 1°C / min), and the obtained sample was the catalyst.

[0028] Catalytic reactions are carried out in fixed-bed microreactors. Take 1.0 g of the catalyst and heat it from room temperature to 550 °C at a rate of 5 °C / min in a nitrogen atmosphere, and keep it for 60 min. Then feed methanol and carbon monoxid...

Embodiment 2

[0033] Weigh 3.5g Fe(NO 3 ) 3 9H 2 O, join in 50g water and carry out ultrasonic dispersion, the time is 4h; Weigh the Zr ion modified H-MOR zeolite molecular sieve of 3.0g (Zr content is 0.5wt%), join in the above-mentioned solution, continue ultrasonic 5h; Ultrasonic dispersion After the mixture was suction filtered and washed, the obtained filter cake was moved to a vacuum drying oven and dried at 80°C for 24 h; The rate of 2°C / min was raised to 550°C for 6 hours; the calcined samples were 2 / Ar atmosphere was reduced for 4 hours at 400°C (heating rate: 1°C / min), and the obtained sample was the catalyst.

[0034] The catalytic reaction was carried out in a fixed-bed high-pressure microreactor, and the reaction conditions and product analysis were the same as in Example 1 except that the raw materials were methanol and ethylene (the feed molar ratio was 10:1), and the reaction performance was shown in Table 1.

Embodiment 3

[0036] Weigh 3.0g Co(NO 3 ) 2 ·6H 2 0, join in 45g water and ethanol mixed solution (water and ethanol mass ratio are 1:1) carry out ultrasonic dispersion, the time is 4h; Take by weighing the Cu ion modified H-MCM-22 zeolite molecular sieve of 3.0g (Cu content is 1:1) 0.5wt%), added to the above solution, and continued ultrasonication for 5h; the mixture after ultrasonic dispersion was suction filtered and washed, and the resulting filter cake was moved to a vacuum drying oven and dried at 80°C for 24h; the obtained sample was moved to a tube furnace In the chamber, the mixed gas of NO / Ar containing 10% NO by volume was introduced, and the temperature was raised to 550°C at a rate of 2°C / min for calcination for 6 hours; the calcined samples were 2 / Ar atmosphere was reduced for 4 hours at 400°C (heating rate: 1°C / min), and the obtained sample was the catalyst.

[0037] The catalytic reaction was carried out in a fixed-bed high-pressure microreactor, except that the raw mat...

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Abstract

The invention relates to a method for preparing aromatic hydrocarbon by methyl alcohol at high selectivity, and relates to aromatic hydrocarbon. The method comprises the following steps of pretreating a catalyst; catalyzing: after the catalyst is pretreated, adding reaction raw materials, forming the methyl alcohol and a hydrogen trapping-removing agent, and reacting by a solid catalyst bed layer at the air speed of 500 to 10000h<-1>, so as to obtain the aromatic hydrocarbon; adding a salt compound of metal element into a solvent, dispersing by ultrasonic waves, adding a modified acid zeolite molecular sieve, and continuing to disperse by ultrasonic waves, so as to obtain a mixture; sucking, filtering and washing the mixture, and drying a filter cake; calcining the dried sample, and reducing, so as to obtain the catalyst. The method has the characteristics that when the aromatic hydrocarbon is prepared by the methyl alcohol, the aromatic hydrocarbon selectivity is excellent, the methane and C5+ hydrocarbon selectivity is low, and the catalyst selectivity is high; the aromatic hydrocarbon selectivity is 85% or above, and the methane selectivity is lower than 2%.

Description

technical field [0001] The invention relates to aromatics, in particular to a method for producing aromatics with methanol with high selectivity. Background technique [0002] Aromatics are important chemical basic raw materials, and benzene, toluene and xylene (ie BTX) in light aromatics are the most important basic chemicals for petrochemical products. At present, the production of aromatics mainly comes from petroleum routes, including catalytic reforming, naphtha hydrogenation, pyrolysis gasoline hydrogenation and aromatics conversion, etc. Due to the increasingly serious problems of resource depletion and environmental pollution caused by the extensive use of petroleum, it is particularly urgent to develop methods for producing aromatics through non-petroleum routes. On the other hand, the technology of producing methanol from coal is quite mature, and methanol can be converted into important chemical raw materials including olefins and aromatics through acid-catalyzed...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C15/04C07C15/06C07C15/08B01J29/76B01J29/24B01J29/48B01J29/12B01J29/16
CPCB01J29/126B01J29/163B01J29/24B01J29/48B01J29/7615B01J29/763B01J29/7676B01J2229/20B01J2229/40C07C1/20C07C15/04C07C15/06C07C15/08Y02P20/52Y02P30/20Y02P30/40
Inventor 康金灿成康周伟何顺张庆红王野
Owner XIAMEN UNIV
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