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Aromatic hydrocarbon methylation catalyst and a preparation method thereof

A methylation and catalyst technology, applied in the field of aromatic hydrocarbon methylation catalyst and its preparation, can solve the problems of low reaction activity, difficult preparation and poor stability of aromatic hydrocarbon methylation, and achieve the promotion of stability, fast diffusion rate and stable good sex effect

Active Publication Date: 2019-04-30
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 hydrocarbon methylation catalyst and a preparation method thereof
  • Aromatic hydrocarbon methylation catalyst and a preparation method thereof
  • Aromatic hydrocarbon methylation catalyst and a 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, 40 grams of tetraethyl orthosilicate and 50 grams of deionized water were mixed and stirred at room temperature for 5 hours to form solution B. Slowly add solution A, stir vigorously for 2 hours, add 1wt% ZSM-5 seed crystals and stir for 1 hour, add 15 grams of ammonia water (M2), then 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 the characteristic diffraction peaks of ZSM-5 zeolite molecular sieve, and the thickness of the flake molecular sieve in the SEM image is about 80nm. Product SiO 2 / Al 2 o 3 The molar ratio is 63, Na + The content is 0.02%, and the molecular sieve yield is 96%.

[0053] Weigh 20 grams of the above-mentioned molecular sieves, 17 grams of alumina, 1 milliliter of concentrated nitric acid, 2.5 grams of ammo...

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, 50 grams of silica sol (40%) and 10 grams of deionized water were mixed and stirred at room temperature for 0.5 hours to form solution B. Slowly add B into solution A, stir vigorously for 2 hours, add 2wt% ZSM-5 seed crystals and stir for 1 hour, add 5 g of ethylamine (M2) solution, and move the mixed system into a stainless steel crystallization kettle, crystallize at 170 ° C for 24 hours. The XRD pattern of the obtained sample has the characteristic diffraction peaks of ZSM-5 zeolite molecular sieve, and the thickness of the flake 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 molecular sieve yield is 98%

[0057] Weigh 20 grams of the above-mentioned molecular sieves, 6 grams of alumina, 0.5 milliliters of concentrated nitric acid, 1.5 grams of m...

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 , Stir vigorously for 2 hours, add 0.5wt% ZSM-5 seed crystals and stir for 1 hour, finally add 8 grams of ammonia water (M2) and mix evenly, transfer to a stainless steel crystallization kettle, and crystallize at 130°C for 72 hours. The XRD spectrum of the obtained sample has the characteristic diffraction peaks of ZSM-5 zeolite molecular sieve, and the thickness of the flake 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 molecular sieve yield is 97%

[0061] Weigh 20 grams of the above-mentioned molecular sieves, 15 grams of silica sol (40%), 2 grams of ammonium molybdate, 1 gram of turnip powde...

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Abstract

The invention relates to an aromatic hydrocarbon methylation catalyst and a preparation method thereof. A purpose of the present invention is mainly to solve the problems of poor stability, low reaction conversion rate, difficulty in preparation and the like of the aryl methylation catalyst in the prior art. According to the present invention, an ammonium type ZSM-5 nano-sheet catalyst is used, and comprises, by weight, a) 5-95 parts of an ammonium type ZSM-5 nano-sheet molecular sieve material, b) 95-5 parts of a binder, and c) the balance of a metal compound; and the catalyst can be used inthe industrial production of aromatic hydrocarbon methylation.

Description

technical field [0001] The invention relates to a catalyst for the methylation of aromatic hydrocarbons and its preparation process. More specifically, the invention relates to a catalyst with ammonium-type ZSM-5 nanosheets as the main active component and its preparation process. Background technique [0002] As one of the most important basic organic chemical raw materials, the demand for p-xylene has shown a strong growth trend in the past five years. Due to the rapid development of the downstream main product PTA industry, the market demand for PX will continue to rise rapidly in the next few years. It is expected that the average annual growth rate of demand will be 24.9%, and the annual consumption growth rate will reach 22.4%. By 2010, China's PTA plant consumption of PX will reach 5.4-6.1 million tons, and the construction of production capacity is far behind the growth of demand. The gap between China's PX demand and production will further expand. [0003] Aromati...

Claims

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Application Information

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Patent Type & Authority Applications(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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