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Application of a Hierarchical Ti-ZSM-5 Molecular Sieve Catalyst in the Synthesis of Toluene and Xylene

A molecular sieve and multi-level pore technology, applied in molecular sieve catalysts, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of affecting the diffusion performance of pores, reducing the utilization rate of methanol, affecting the crystallinity of molecular sieves, etc., and achieving high utilization rate of methanol , the effect of reducing cost and energy consumption, low ethylbenzene selectivity

Active Publication Date: 2017-03-01
嘉善县国创新能源研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The conventional method of loading alkali metals to adjust the acidity of molecular sieves will affect the diffusion properties of the pores, thereby reducing the utilization of methanol; directly adjusting the silicon-aluminum ratio during the synthesis of hierarchically porous ZSM-5 will affect the crystallinity of molecular sieves

Method used

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  • Application of a Hierarchical Ti-ZSM-5 Molecular Sieve Catalyst in the Synthesis of Toluene and Xylene
  • Application of a Hierarchical Ti-ZSM-5 Molecular Sieve Catalyst in the Synthesis of Toluene and Xylene
  • Application of a Hierarchical Ti-ZSM-5 Molecular Sieve Catalyst in the Synthesis of Toluene and Xylene

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment one: with 0.068g aluminum isopropoxide, 10g tetrapropyl ammonium hydroxide aqueous solution (25wt%), 13.2ml tetraethyl orthosilicate, 1.21g hexadecyltrimethoxysilane (85wt%) and 52ml ethanol Mix in a beaker and stir at 20°C until a gel is formed; the gel is dried at 20°C for 24 hours, then the gel is transferred to a PTFE liner (A) with a volume of 50ml, and another 250ml Add 40ml of deionized water to the polytetrafluoroethylene lining (B), then transfer the above-mentioned lining (A) to the lining (B), and now the deionized water is between the two linings; Transfer the good lining to a 250ml stainless steel hydrothermal kettle, crystallize at 170°C for 70h; filter and wash, dry at 100°C for 4h, and roast at 550°C for 10h; Sieve, take the catalyst with particle size of 20-40 meshes, and then prepare the hierarchical porous Ti-ZSM-5 molecular sieve with 0 mol% Ti substitution.

Embodiment 2

[0027] Example 2: 0.0544g aluminum isopropoxide, 0.0151g tetraethyl titanate, 10g tetrapropylammonium hydroxide aqueous solution (25wt%), 13.2ml tetraethyl orthosilicate, 1.21g hexadecyltrimethoxy Silane (85wt%) and 52ml ethanol were mixed in a beaker and stirred at 20°C until a gel was formed; the gel was dried at 20°C for 24h, and then the gel was transferred to a PTFE liner with a volume of 50ml (A) , take another polytetrafluoroethylene liner (B) with a volume of 250ml and add 40ml of deionized water to it, then transfer the above-mentioned liner (A) to the liner (B), at this time the deionized water is located Between the two inner linings; transfer the assembled inner lining to a 250ml stainless steel hydrothermal kettle, and crystallize at 170°C for 70h; after filtering and washing, dry at 100°C for 4h, and roast at 550°C for 10h; The catalyst is pressed into tablets, crushed and sieved, and the catalyst with a particle size of 20-40 meshes is taken to obtain a hierarch...

Embodiment 3

[0028] Example three: 0.034g aluminum isopropoxide, 0.0378g tetraethyl titanate, 10g tetrapropyl ammonium hydroxide aqueous solution (25wt%), 13.2ml tetraethyl orthosilicate, 1.21g hexadecyltrimethoxy Silane (85wt%) and 52ml ethanol were mixed in a beaker and stirred at 20°C until a gel was formed; the gel was dried at 20°C for 24h, and then the gel was transferred to a PTFE liner with a volume of 50ml (A) , take another polytetrafluoroethylene liner (B) with a volume of 250ml and add 40ml of deionized water to it, then transfer the above-mentioned liner (A) to the liner (B), at this time the deionized water is located Between the two inner linings; transfer the assembled inner lining to a 250ml stainless steel hydrothermal kettle, and crystallize at 170°C for 70h; after filtering and washing, dry at 100°C for 4h, and roast at 550°C for 10h; The catalyst is pressed into tablets, crushed and sieved, and the catalyst with a particle size of 20 to 40 meshes is taken to obtain a h...

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Abstract

The invention relates to an application of a hierarchical pore Ti-ZSM-5 molecular sieve catalyst in synthesis of toluene and xylene. A method for preparing the catalyst comprises the following steps: mixing ethyl orthosilicate, aluminium isopropoxide, tetraethyl titanate, tetrapropylammonium hydroxide, hexadecyltrimethoxysilane and ethanol, stirring at temperature of 10-30 DEG C to form gel; drying the gel at 10-30 DEG C and drying for 12-24 hours, then crystallizing for 48-100 hours at 150-200 DEG C under vapour assistance; filtering the crystallized products and washing, drying for 2-4 hours at temperature of 80-120 DEG C, calcinating for 7-10 hours at 400-700 DEG C; tabletting the calcined products, fragmenting, sieving, and selecting the particles with 20-40 meshes to prepare the hierarchical pore Ti-ZSM-5 molecular sieve catalyst. The catalyst has the advantages of high benzene conversion activity, high methanol utilization rate, high xylene selectivity and low ethylbenzene selectivity.

Description

[0001] (1) Technical field [0002] The invention relates to the application of a multi-level porous Ti-ZSM-5 molecular sieve catalyst in the synthesis of toluene and xylene by the alkylation reaction of benzene and methanol. [0003] (2) Background technology [0004] Toluene and xylene are important chemical raw materials with a wide range of uses. Among them, p-xylene is mainly used for the production of polyethylene terephthalate (PET), and then for the synthesis of polyester fibers, resins, films, beverage bottles, etc. Ortho-xylene and m-xylene are used to synthesize ortho-dibenzoic acid and m-dibenzoic acid, respectively, and then synthesize plasticizers and polyether resins. Traditionally, toluene and xylene mainly come from petrochemicals. With the depletion of petroleum resources, it is of great significance to develop non-petroleum routes to produce toluene and xylene. [0005] Literature (Adebajo M.O., et al, Catalysis Today, 63(2000): 471–478; Lu L., et al, Acta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/16C07C15/06C07C15/073C07C2/86C07C2/88B01J29/89B01J35/10
CPCY02P20/52
Inventor 李小年胡华雷张群峰卢春山丰枫吕井辉王清涛
Owner 嘉善县国创新能源研究院
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