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A kind of preparation method of sapo-34 molecular sieve microsphere catalyst and the application of catalyst

A SAPO-34 catalyst technology, applied in the field of molecular sieve catalyst preparation, can solve the problems of crystallization product recovery and washing loss, low solid content of synthetic gel, and low synthesis yield, so as to reduce catalyst cost and solid waste treatment cost , The effect of high conversion rate of methanol

Active Publication Date: 2018-05-22
岳阳慧璟新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem in the prior art is that the synthesis yield is low, or the solid content of the synthesis gel is low, resulting in a low output per unit volume of the overall high-pressure synthesis kettle, and the subsequent recovery and washing loss of the crystallization product is serious

Method used

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  • A kind of preparation method of sapo-34 molecular sieve microsphere catalyst and the application of catalyst
  • A kind of preparation method of sapo-34 molecular sieve microsphere catalyst and the application of catalyst
  • A kind of preparation method of sapo-34 molecular sieve microsphere catalyst and the application of catalyst

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Effect test

Embodiment 1

[0031] (1) Gel preparation: First, 215.13 kg of distilled water was added to the autoclave, the stirring speed was 100 rpm, and 43.4 kg of pseudoboehmite with a solid content of 70 wt% was slowly added, in an oil bath at 40°C, and then slowly added 89.93 kilograms of phosphoric acid with a concentration of 85wt%, stirred evenly, then slowly added 6.76 kilograms of silica sol with a concentration of 40wt%, stirred evenly, then added 176.76 kilograms of tetraethylammonium hydroxide aqueous solution with a concentration of 25wt%, and then added 6.07 kilograms of triethyl ammonium hydroxide Amine, increase the stirring speed to 300 rpm and stir for 5 hours to make the system into a uniform gel; shear the homogeneous gel on a homogenizer at 10,000 rpm for 30 minutes. Aged for 16 hours at room temperature.

[0032] (2) Crystallization: With a heating rate of 5°C / hour, heat up to the crystallization temperature of 160°C, the crystallization time is 84 hours, and the stirring speed is...

Embodiment 2

[0038] (1) Gel preparation: first add 235.88 kg of distilled water to the autoclave, 20 ° C oil bath, stirring speed 200 rpm, then slowly add 27.2 kg of pseudo-boehmite with a solid content of 75%, and then slowly add 46.12 kg of 85 wt% phosphoric acid, stirred evenly, then slowly added 1.50 kg of 40 wt% silica sol, continued to stir evenly; then added 176.76 kg of 25 wt% tetraethylammonium hydroxide aqueous solution, and then added 7.09 kg of isopropylamine. Increase the stirring speed to 400 rpm and stir for 2 hours; shear the homogeneous gel on a homogenizer at 4000 rpm for 150 minutes to make the solution into a uniform gel. Aged for 6 hours at room temperature.

[0039] (2) Crystallization: at a heating rate of 50°C / hour, heat up to the crystallization temperature of 190°C, the crystallization time is 36 hours, and the stirring speed is 200 rpm. After the crystallization is complete, pass cooling oil to the reactor jacket Cool quickly.

[0040] (3) Mother liquor of crys...

Embodiment 3

[0045] (1) Gel preparation: first 103.26 kilograms of distilled water is added in the autoclave, 30 ℃ of oil baths, stirring speed 630 rev / mins, then slowly add 62.77 kilograms of pseudo-boehmite with a solid content of 65%, and then slowly Add 138.35 kg of 85 wt% phosphoric acid, stir evenly, then slowly add 15.03 kg of 40 wt% silica sol, continue stirring evenly, then add 117.84 kg of 25 wt% tetraethylammonium hydroxide aqueous solution, and then add 2.13 kg of diethylamine. Increase the stirring speed to 500 rpm and stir for 4 hours; shear the homogeneous gel on a homogenizer at 7000 rpm for 90 minutes to make a homogeneous gel. Aged at room temperature for 24 hours.

[0046] (2) Crystallization: at a heating rate of 30°C / hour, heat up to the crystallization temperature of 175°C, the crystallization time is 60 hours, and the stirring speed is 100 rpm. After the crystallization is complete, pass cooling oil to the reactor jacket Cool quickly.

[0047] (3) Crystallization m...

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Abstract

The invention relates to a SAPO-34 molecular sieve microsphere catalyst preparation method, which comprises: adding an aluminum source into deionized water under a room temperature stirring state, adding a phosphorus source, uniformly stirring, slowly adding a silicon source, continuously and uniformly stirring, adding a tetraethyl ammonium hydroxide solution, continuously adding one and / or a plurality of materials selected from isopropylamine, diethylamine and triethylamine after uniformly stirring to form a uniform gel, crystallizing, unloading the synthesized product mother liquor from the autoclave after completing the crystallizing, carrying out spray drying, and calcining for 1.5-2.5 h to obtain the catalyst. According to the present invention, the synthesis yield is high, the separation and the washing on the molecular sieve synthetic product are not required, and the one-time catalyst molding granulation is achieved.

Description

technical field [0001] The invention belongs to a preparation method of a molecular sieve catalyst, in particular to a preparation method of a SAPO-34 molecular sieve microsphere catalyst and an application of the catalyst. Background technique [0002] SAPO-34 was a new silicon aluminum phosphorus molecular sieve with chabazite structure (CHA) invented by Union Carbide Corporation (UCC) in 1984. SAPO-34 molecular sieve has the advantages of medium-strength acid centers, unique small window pore structure, large supercage, abundant micropores, and large specific surface area, making it suitable for methanol-to-olefins (MTO), methyl chloride, The conversion of low-carbon oxygenated compounds such as ethanol to olefins, the cracking of high-carbon alkanes or olefins to low-carbon olefins and other catalytic fields, the field of automobile exhaust purification, the field of membrane separation and the field of functional materials have been widely used. [0003] SAPO-34 molecu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85
CPCB01J29/85C01B37/08C01B39/54C01P2002/72C01P2004/03C01P2004/32C01P2004/64C01P2006/12C07C1/20C07C2529/85C07C11/02
Inventor 常云峰张福丽苏国锋吕海龙周杰黄小东
Owner 岳阳慧璟新材料科技有限公司
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