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Aromatic methylation catalyst and preparation method thereof

A catalyst and methylation technology, which is applied in the direction of carbon compound catalysts, catalysts, physical/chemical process catalysts, etc., can solve the problems of difficult preparation, poor stability, and low reactivity of aromatic hydrocarbon methylation

Active Publication Date: 2022-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] What the present invention aims to solve are the problems of low catalyst activity, poor stability, good selectivity and stability, but difficult preparation of catalysts in previous literatures for aromatic hydrocarbon methylation.

Method used

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  • Aromatic methylation catalyst and preparation method thereof
  • Aromatic methylation catalyst and preparation method thereof
  • Aromatic methylation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 2 grams of aluminum nitrate, 5 grams of ethylamine (M1) and 30 milliliters of water were stirred and dissolved to form solution A. After mixing 40 grams of tetraethyl orthosilicate and 50 grams of deionized water, they were stirred at room temperature for 5 hours to form solution B. Slowly add solution A, stir vigorously for 2 hours, add 1 wt% ZSM-5 seed crystal, stir for 1 hour, add 15 g of ammonia water (M2), and transfer the mixed system into a stainless steel crystallization kettle, and crystallize at 150°C for 72 hours. The XRD pattern of the obtained sample has characteristic diffraction peaks of ZSM-5 zeolite molecular sieve, and the thickness of the sheet molecular sieve in the SEM image is about 80 nm. Product SiO 2 / Al 2 O 3 The molar ratio is 63, Na + The content is 0.02%, and the yield of molecular sieve is 96%.

[0053] Weigh 20 grams of the above molecular sieve, 17 grams of alumina, 1 milliliter of concentrated nitric acid, 2.5 grams of ammonium molyb...

Embodiment 2

[0056] 1.5 grams of aluminum sulfate, 2 grams of diethylamine (M1) and 30 milliliters of water were stirred and dissolved to form solution A. After mixing 50 grams of silica sol (40%) and 10 grams of deionized water, they were stirred at room temperature for 0.5 hours to form solution B. B was slowly added to solution A, vigorously stirred for 2 hours, added with 2wt% ZSM-5 seed crystals and stirred for 1 hour, added 5 g of ethylamine (M2) solution, and the mixed system was transferred into a stainless steel crystallization kettle, and crystallized at 170 ° C for 24 hours. The XRD pattern of the obtained sample has characteristic diffraction peaks of ZSM-5 zeolite molecular sieve, and the thickness of the sheet molecular sieve in the SEM image is about 50 nm. Product SiO 2 / Al 2 O 3 The molar ratio is 147, Na + The content is 0.01%, and the yield of molecular sieve is 98%

[0057] Weigh 20 g of the above molecular sieve, 6 g of alumina, 0.5 ml of concentrated nitric acid,...

Embodiment 3

[0060] 5 grams of aluminum nitrate, 2 grams of ethylenediamine (M1) and 30 grams of deionized water were stirred and dissolved to form solution A, 40 grams of white carbon black was added to 50 grams of water and continued to stir to obtain solution B, and solution B was slowly added to solution A. , vigorously stirred for 2 hours, added 0.5wt% ZSM-5 seed crystals, stirred for 1 hour, and finally added 8 grams of ammonia water (M2), mixed well, moved into a stainless steel crystallization kettle, and crystallized at 130°C for 72 hours. The XRD pattern of the obtained sample has characteristic diffraction peaks of ZSM-5 zeolite molecular sieve, and the thickness of the sheet molecular sieve in the SEM image is about 30 nm. Product SiO 2 / Al 2 O 3 The molar ratio is 98, Na + The content is 0.01%, and the yield of molecular sieve is 97%

[0061] Weigh 20 grams of the above molecular sieve, 15 grams of silica sol (40%), 2 grams of ammonium molybdate, 1 gram of succulent powder...

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Abstract

The invention relates to an aromatic hydrocarbon methylation catalyst and a preparation method thereof, and mainly solves the problems of poor stability of the aryl methylation catalyst, low reaction conversion rate, difficult preparation and the like in the prior art. By adopting ammonium type ZSM-5 nanosheet catalyst, the present invention comprises the following components in parts by weight: a) 5-95 parts of ammonium type ZSM-5 nanosheet molecular sieve material; b) 95-5 parts of binder ; c) the balance of the metal compound. This catalyst can be used in the industrial production of aromatics methylation.

Description

technical field [0001] The invention relates to a preparation process for an aromatic hydrocarbon methylation catalyst, and furthermore, the invention relates to a catalyst with ammonium type ZSM-5 nanosheets as the main active component and a preparation process thereof. Background technique [0002] As one of the most important basic organic chemical raw materials, the demand for paraxylene has shown a strong growth trend in the past five years. Affected by the rapid development of the PTA industry, the main downstream product, the market demand for PX in the next few years will continue to rise rapidly. By 2010, the PX consumption of China's PTA installations will reach 5.4-6.1 million tons, and the construction of production capacity is far behind the growth of demand, and the gap between China's PX demand and output will further widen. [0003] Aromatic alkylation is a catalytic reaction in which aromatic compounds react with alkylating reagents to form para-xylene. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/48C07C2/86C07C15/08
CPCC07C2/864B01J29/48B01J2229/18C07C2529/48C07C15/08Y02P20/52
Inventor 周亚新孔德金李为吴历斌
Owner CHINA PETROLEUM & CHEM CORP
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