Method for preparing SAPO-34 molecular sieve

A technology of SAPO-34 and molecular sieves, which is applied in the field of preparation of SAPO-34 molecular sieves, can solve problems such as complex feeding sequence operations, and achieve the effects of convenient operation, uniform particle size, and simple process

Inactive Publication Date: 2009-09-09
CHENGDU HUIEN FINE CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN101293660 discloses a method for synthesizing SAPO molecular sieves by controlling the feeding sequence, but the feeding sequence operation is too complicated
[0007] The above-mentioned patent documents have reported the synthesis of SAPO-34 molecular sieves, but these patents still have many defects in synthesizing high crystallinity, uniform particle size, and small grain SAPO-34 molecular sieves, which are urgently improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix 15.1g (0.074mol) of aluminum isopropoxide and 27.89g (1.55mol) of deionized water evenly, then add 8.69g (0.075mol) of 85% orthophosphoric acid, and then add 11.23g (0.11mol) of triethylamine in sequence after stirring evenly and 5.87g (0.029mol) of 30% silica sol, fully stirred. The above mixture was put into a pressure-resistant container lined with polytetrafluoroethylene, and after ultrasonic treatment at a temperature of 20°C, a frequency of 40kHz, and a power of 200W for 0.5hr, it was crystallized at a temperature of 200°C for 18hr. The solid product was centrifuged and washed, dried at a temperature of 110° C. for 3 hours, and then the dried solid product was calcined at a temperature of 550° C. for 6 hours to obtain a SAPO-34 molecular sieve product. The measured crystallinity of the product is 93%, and the average particle size is 3.7 μm.

Embodiment 2

[0031] Will Al 2 o 3 Add 5.72g (0.037mol) of pseudo-boehmite with a content of 66% into 17.43g (0.012mol) of 10wt% tetraethylammonium hydroxide aqueous solution, mix well and slowly add 4.26g (0.037mol) of 85% orthophosphoric acid dropwise , and add 100 g (5.56 mol) of deionized water and stir evenly, then add 1.10 g (0.0055 mol) of 30% silica sol and 11.51 g (0.64 mol) of deionized water, and stir well. The above system was put into a polytetrafluoroethylene pressure vessel, and after ultrasonic treatment at a temperature of 90° C., a frequency of 60 kHz, and a power of 400 W for 1 hr, it was crystallized at a temperature of 180° C. for 48 hrs. The solid product was centrifuged and washed, dried at a temperature of 115° C. for 2.5 hours, and then the dried solid product was calcined at a temperature of 545° C. for 6 hours to obtain a SAPO-34 molecular sieve product. The measured crystallinity of the product is 95%, and the average particle size is 1.1 μm.

Embodiment 3

[0033] Will Al 2 o 3 Add 5.72g (0.037mol) of pseudo-boehmite with a content of 66% into 33.87g (0.023mol) of 10wt% tetraethylammonium hydroxide aqueous solution, stir well and then add 4.40g (0.022mol) of 30% silica sol and stir well , and then slowly dropwise added 8.52 g (0.074 mol) of 85% orthophosphoric acid and 43.13 g (2.4 mol) of deionized water and mixed uniformly. The above system was put into a polytetrafluoroethylene pressure vessel, pre-crystallized at a temperature of 80° C. for 24 hours, and then crystallized at a temperature of 200° C. for 24 hours. The solid product was washed by centrifugation, dried at a temperature of 105° C. for 3 hours, and then the dried solid product was calcined at a temperature of 560° C. for 5 hours to obtain a SAPO-34 molecular sieve product. The measured crystallinity of the product is 98%, and the average particle size is 2.7 μm.

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Abstract

The invention discloses a method for preparing SAPO-34 molecular sieve, which is characterized in that Al2O3, P2O5, SiO2, R and H2O which have the mol ratio of 1:0.5-1.02:0.1-0.8:0.32-3:50-200 are mixed together into crystallization liquid and processed by aging treatment at the temperature of 2-110 DEG C for 10-24hr; or the crystallization liquid is processed by ultrasonic treatment at the temperature of 20-90 DEG C for 0.5-1hr, the ultrasonic frequency is 40-60 Hz, and the power is 200-400W. After being pretreated by the technique, the crystallization liquid is crystallized at the temperature of 180-200 DEG C for 18-48hr, and the solid product is washed in a centrifugal way and dried at the temperature of 105-115 DEG C; then, the obtained solid product is calcined at the temperature of 530-560 DEG C for 5-6hr, so that the SAPO-34 molecular sieve is obtained.

Description

technical field [0001] The invention relates to a preparation method of SAPO-34 molecular sieve, which belongs to the field of catalyst preparation. Background technique [0002] Low-carbon olefins (referring to ethylene, propylene, butene and their mixtures) are used as raw materials for synthetic detergents, plastics, fibers and various chemical materials, and play a pivotal role in the modern petrochemical industry. Traditional light olefins are produced through petroleum cracking, which means that most of our chemical industry raw materials and fuels now depend on petroleum. Petroleum resources are very scarce in China, and my country's petrochemical industry is greatly affected by changes in international oil prices. [0003] Starting from my country's energy structure, the process of converting C1 raw materials (methanol, methyl chloride, etc.) into light olefins from unconventional petroleum resources such as natural gas and coal is a breakthrough for basic chemicals...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08B01J29/85C07C1/20C07C1/26
Inventor 蒋文伟罗云罗芩陈洪杨琴孙永贵李晶晶郑春宁
Owner CHENGDU HUIEN FINE CHEM
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