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Method for preparing SAPO-11 molecular sieve

A technology of SAPO-11 and molecular sieve, which is applied in the direction of molecular sieve characteristic silicoaluminophosphate, molecular sieve and alkali exchange phosphate, etc., can solve the problem of easy formation of other silicoaluminophosphate molecular sieve miscellaneous crystals, etc., and achieve acidity with strong controllability Effect

Active Publication Date: 2014-01-22
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is to solve the problem that existing methods for preparing SAPO-11 molecular sieves easily generate other silicoaluminophosphate molecular sieve miscellaneous crystals, and provide a preparation method for SAPO-11 molecular sieves

Method used

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  • Method for preparing SAPO-11 molecular sieve

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specific Embodiment approach 1

[0017] Specific embodiment one: the preparation method of a kind of SAPO-11 molecular sieve of present embodiment, carry out according to the following steps:

[0018] 1. Preparation of the initial gel: Add phosphoric acid with a mass fraction of 85%, pseudoboehmite with a mass fraction of 69%, di-n-butylamine with a mass fraction of 95%, and silica sol with a mass fraction of 27%. into deionized water and stirred at a speed of 800r / min to 2000r / min for 1h to 5h to obtain an initial gel; the mass fraction is 85% of phosphoric acid and 69% of pseudo-boehmite Mass ratio is 1:(0.5~0.8); Described mass fraction is that the mass ratio of phosphoric acid of 85% and mass fraction is 95% di-n-butylamine is 1:(0.6~1.0); Described mass fraction is The mass ratio of 85% phosphoric acid to 27% silica sol is 1:(0.05~1.0); the mass ratio of 85% phosphoric acid to deionized water is 1:(3.9~4.7) ;

[0019] 2. Crystallization and post-treatment: Place the initial gel prepared in step 1 in a ...

specific Embodiment approach 2

[0022] Specific embodiment two: what this embodiment is different from specific embodiment one is: the mass fraction described in step one is that the mass fraction of the phosphoric acid of 85% and mass fraction is the mass ratio of the pseudo-boehmite of 69% is 1:(0.6 ~0.7); The mass fraction described in step one is that the mass ratio of the phosphoric acid of 85% and the mass fraction of 95% di-n-butylamine is 1:(0.7~0.9); The mass fraction described in step one is 85% % phosphoric acid and mass fraction are 1:(0.07~0.9) for the mass ratio of silica sol of 27%; The mass ratio described in step one is 85% phosphoric acid and the mass ratio of deionized water is 1:(4.0~ 4.5). Others are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Specific embodiment three: what this embodiment is different from specific embodiment one or two is: the mass fraction described in step one is that the mass ratio of the phosphoric acid of 85% and the pseudo-boehmite of 69% is 1: 0.7; the mass fraction described in step one is that the mass ratio of 85% phosphoric acid and 95% di-n-butylamine is 1:0.8; the mass fraction described in step one is 85% phosphoric acid and mass fraction The mass ratio of 27% silica sol is 1:(0.2-0.8); the mass ratio of phosphoric acid with a mass fraction of 85% and deionized water described in step 1 is 1:4.3. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for preparing the SAPO molecular sieve to solve the problem that other SAPO class molecular sieve mixed crystals are easily generated through an existing method for preparing the SAPO-11 molecular sieve. The method includes the step of preparing initial gel, namely, firstly, preparing phosphoric acid, pseudo-boehmite, di-n-butylamine, silica sol and deionized water into the initial gel, and the step of crystallization and post-processing, namely, conducting crystallization on the initial gel prepared in the first step, naturally cooling crystallized gel till the crystallized gel is at the room temperature, and conducting centrifugation, washing, drying and calcination to obtain the SAPO-11 molecular sieve. The SAPO-11 molecular sieve prepared through the method is an aggregate formed by regularly arraying pure-phase high-crystallinity stick-shaped crystalline grains, the SAPO-11 molecular sieve with the silica-aluminium ratio ranging from 0.2 to 0.8 can be synthesized through the method, and the adjustability of the acidity of the molecular sieve can be better. The method can be used for preparing the SAPO-11 molecular sieve.

Description

technical field [0001] The invention relates to a preparation method of silicoaluminophosphate molecular sieve. Background technique [0002] SAPO-11 molecular sieve is a mesoporous silicoaluminophosphate molecular sieve with AEL topological structure. It has one-dimensional non-intersecting ten-membered ring elliptical channels. The channel size is 0.39nm×0.64nm. It belongs to the orthorhombic crystal system. The constants are a=1.34nm, b=1.87nm, c=0.84nm. Due to its suitable pore structure and size and relatively mild acidity, SAPO-11 molecular sieve has broad application prospects in various oil refining and chemical industries such as catalytic hydrocracking, isomerization, alkylation and light olefin polymerization. [0003] At present, there are 7 kinds of templates commonly used in the process of synthesizing SAPO-11 molecular sieves, mainly di-n-propylamine, diisopropylamine and diethylamine, and di-n-propylamine (DPA) is the most commonly used, but because the temp...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54
Inventor 吴伟赵爱娟
Owner HEILONGJIANG UNIV
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