A kind of preparation method and application of small grain silicoaluminophosphate molecular sieve

A technology of silicoaluminophosphate and small crystal grains, which is applied in the direction of molecular sieve catalyst, molecular sieve and alkali exchange phosphate, molecular sieve characteristic silicoaluminophosphate, etc. It can solve the problems that have not been discovered and reported, and can improve the diffusion performance, The effect of reducing side reactions, simple preparation and catalytic process

Active Publication Date: 2018-06-12
XIAN ORIGIN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, no related studies have been reported

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  • A kind of preparation method and application of small grain silicoaluminophosphate molecular sieve
  • A kind of preparation method and application of small grain silicoaluminophosphate molecular sieve
  • A kind of preparation method and application of small grain silicoaluminophosphate molecular sieve

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Embodiment 1

[0032] The preparation method of the small grain silicoaluminophosphate molecular sieve of the present embodiment comprises the following steps:

[0033] Step 1, according to the molar ratio Al 2 o 3 :P 2 o 5 : SiO 2 :TEAOH:TEA:H 2 O: PEG = 1.0: 0.5: 0.25: 0.1: 2.15: 50: 0.05, weigh pseudo-boehmite, orthophosphoric acid, silica sol, tetraethylammonium hydroxide, triethylamine, deionized water and polyethylene Ethylene glycol, then stir the weighed pseudo-boehmite, orthophosphoric acid, silica sol, tetraethylammonium hydroxide, triethylamine and deionized water evenly, then add polyethylene glycol, stir again Obtain an initial gel mixture, then place the initial gel mixture in a crystallization tank, conduct hydrothermal crystallization at a temperature of 200°C for 48 hours, and obtain a crystallization liquid after natural cooling;

[0034] Step 2. Filter, wash and dry the crystallization solution described in step 1 in sequence. The drying temperature is 120°C, and the d...

Embodiment 2

[0038] The preparation method of the small grain silicoaluminophosphate molecular sieve of the present embodiment comprises the following steps:

[0039] Step 1, according to the molar ratio Al 2 o 3 :P 2 o 5 : SiO 2 :TEAOH:TEA:H 2 O: PEG = 1.0: 1.0: 0.5: 0.2: 2.0: 80: 0.1, respectively weigh pseudo-boehmite, orthophosphoric acid, silica sol, tetraethylammonium hydroxide, triethylamine, deionized water and polyethylene Ethylene glycol, then stir the weighed pseudo-boehmite, orthophosphoric acid, silica sol, tetraethylammonium hydroxide, triethylamine and deionized water evenly, then add polyethylene glycol, stir again Obtain an initial gel mixture, then place the initial gel mixture in a crystallization tank, conduct hydrothermal crystallization at a temperature of 220°C for 50 hours, and obtain a crystallization liquid after natural cooling;

[0040] Step 2. Filter, wash and dry the crystallization solution described in step 1 in sequence. The drying temperature is 120°...

Embodiment 3

[0043] The preparation method of the small grain silicoaluminophosphate molecular sieve of the present embodiment comprises the following steps:

[0044] Step 1, according to the molar ratio Al 2 o 3 :P 2 o 5 : SiO 2 :TEAOH:TEA:H 2 O: PEG = 1.0: 0.8: 0.35: 0.15: 2.1: 65: 0.08, respectively weigh pseudo-boehmite, orthophosphoric acid, silica sol, tetraethylammonium hydroxide, triethylamine, deionized water and polyethylene Ethylene glycol, then stir the weighed pseudo-boehmite, orthophosphoric acid, silica sol, tetraethylammonium hydroxide, triethylamine and deionized water evenly, then add polyethylene glycol, stir again Obtain an initial gel mixture, then place the initial gel mixture in a crystallization tank, conduct hydrothermal crystallization at a temperature of 180°C for 45 hours, and obtain a crystallization liquid after natural cooling;

[0045] Step 2. Filter, wash and dry the crystallization solution described in step 1 in sequence. The drying temperature is 1...

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Abstract

The invention provides a preparation method of a small crystalline grain silicoaluminophosphate molecular sieve. The preparation method comprises following steps: 1, pseudo-boehmite, orthophosphoric acid, silica sol, tetraethylammonium hydroxide, triethylamine, and deionized water are uniformly stirred, polyethylene glycol is added, an initial gel mixture is obtained via uniform stirring, and is delivered into a crystallization kettle for hydrothermal crystallization so as to obtain a crystallization liquid; and 2, the crystallization liquid is subjected to filtering, washing, drying, and roasting successively so as to obtain the small crystalline grain silicoaluminophosphate molecular sieve. The invention also provides a method used for catalyzing dehydration of mixed alcohol with the small crystalline grain silicoaluminophosphate molecular sieve so as to prepare olefins. The particle size of the small crystalline grain silicoaluminophosphate molecular sieve ranges from 2 to 3<mu>m, and is beneficial for improving of diffusion ability, increasing of catalytic selectivity, and prolonging of service life. When the small crystalline grain silicoaluminophosphate molecular sieve is used for catalyzing dehydration of mixed alcohol, reaction heat energy is controlled via adjusting the ratio of different alcohols, so that a problem of heat supplying is solved, and side reaction is avoided.

Description

technical field [0001] The invention belongs to the technical field of catalytic engineering, and in particular relates to a preparation method and application of a small-grain silicon-aluminophosphate molecular sieve. Background technique [0002] Low-carbon olefins, especially ethylene and propylene, are considered as basic raw materials in the chemical industry. The downstream products mainly include ethylene oxide, polyethylene, polypropylene, ethylene glycol, and acrylonitrile. In recent years, with the rapid development of the world economy, the demand for basic chemical raw materials such as low-carbon olefins has increased year by year. It is extremely urgent to increase the production capacity of low-carbon olefins to meet the needs of economic development. [0003] The catalyzed dehydration of some alcohols to olefins is an endothermic reaction, such as ethanol. The reaction of ethanol dehydration to ethylene is a strong endothermic reaction, and it is difficult ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B37/08C01B39/54B01J29/85C07C1/24C07C11/04C07C11/06C07C11/08
CPCY02P20/52
Inventor 曾清湖宋庆锋张勇高亚娜王瑞潘喜强吴西宁郭彦鑫潘蕊娟
Owner XIAN ORIGIN CHEM TECH
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