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SAPO-31 molecular sieve and preparation method thereof

A SAPO-31, molecular sieve technology, applied in the direction of molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of SAPO-31 high cost, complicated operation, long crystallization time, etc., to achieve a wide acid density And acid strength adjustable range, simple preparation process, easy to operate effect

Active Publication Date: 2015-05-20
HEILONGJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that existing SAPO-31 molecular sieve preparation methods have long crystallization time, low yield, complex operation, and inability to carry out large-scale production. The prepared SAPO-31 has high cost and is prone to SAPO- 5 mixed crystals, SAPO-11 mixed crystals and SiO 2 To solve the problem of miscellaneous crystals, a new preparation method of SAPO-31 molecular sieve is provided

Method used

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  • SAPO-31 molecular sieve and preparation method thereof
  • SAPO-31 molecular sieve and preparation method thereof
  • SAPO-31 molecular sieve and preparation method thereof

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specific Embodiment approach 1

[0019] Specific embodiment one: this embodiment provides a kind of SAPO-31 molecular sieve, is prepared by phosphoric acid, pseudo-boehmite, silica sol and di-n-butylamine; Wherein, the mass ratio of pseudo-boehmite and phosphoric acid is ( 0.40~0.70):1, the mass ratio of silica sol to phosphoric acid is (0.30~0.90):1, and the mass ratio of di-n-butylamine to phosphoric acid is (0.50~0.90):1.

[0020] This embodiment has the following advantages: 1. The SAPO-31 molecular sieve provided by this embodiment adopts cheap pseudo-boehmite and silica sol as aluminum source and silicon source respectively, and adopts cheap di-n-butylamine as template agent, The prepared SAPO-31 molecular sieve is not only low in cost, but also due to the use of di-n-butylamine as a template, the synthesized SAPO-31 molecular sieve is not prone to SAPO-5, SAPO-11 and SiO 2 Miscellaneous crystals; 2. The SAPO-31 molecular sieve provided by this embodiment has a wider range of silicon-aluminum ratio, so ...

specific Embodiment approach 2

[0021] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass percent concentration of phosphoric acid is 85%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Specific embodiment three: this embodiment is the method for preparing a kind of SAPO-31 molecular sieve described in specific embodiment one, specifically completes according to the following steps:

[0023] 1. Add pseudo-boehmite, silica sol, di-n-butylamine and water to phosphoric acid, and stir at a stirring rate of 800r / min-1000r / min for 5h-7h to obtain an initial gel; among them, pseudo-boehmite The mass ratio of silica sol to phosphoric acid is (0.40~0.70):1, the mass ratio of silica sol to phosphoric acid is (0.30~0.90):1, the mass ratio of di-n-butylamine to phosphoric acid is (0.50~0.90):1, water and The mass ratio of phosphoric acid is (2.0~4.0):1;

[0024] 2. Add the initial gel obtained in step 1 into a crystallization kettle, crystallize at a temperature of 170°C to 190°C for 2h to 48h, and cool to 20°C to 25°C to obtain a solid-liquid mixture. After the mixture is centrifuged and washed, it is dried at a temperature of 100°C to 120°C for 10h to 24h to ob...

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Abstract

An SAPO-31 molecular sieve and a preparation method thereof relate to a molecular sieve and a preparation method thereof. The invention aims to solve problems in an existing preparation method of the SAPO-31 molecular sieve, such as long crystallization time, low yield, complex operation, unsuitability for mass production, high cost of the prepared SAPO-31, and easy generation of SAPO-5 mixed crystal, SAPO-11 mixed crystal and SiO2 mixed crystal. The SAPO-31molecular sieve is prepared from phosphoric acid, pseudoboehmite, silica sol and di-n-butylamine. The preparation method comprises steps of: 1. initial gel preparation; 2. crystallization; and 3. roasting to obtain the SAP-O31 molecular sieve. The invention is applicable to the fields of catalyst and petrochemical processing.

Description

technical field [0001] The invention relates to a SAPO-31 molecular sieve and a preparation method thereof. Background technique [0002] The silicoaluminophosphate SAPO-31 molecular sieve (ATO topological structure, pore size 0.54×0.54nm) with a twelve-membered ring one-dimensional channel structure is beneficial to the molecular dynamics size of the smaller unit due to the confinement of the channel. The formation of branched chain isomers limits the formation of double branched or multi-branched isomers with relatively large molecular dynamics sizes. Because SAPO-31 molecular sieve has a suitable pore structure size and mild and adjustable acidity, SAPO-31 molecular sieve is used as an acidic carrier to carry noble metal / non-precious metal. The reaction showed good catalytic activity and isomerization selectivity. [0003] At present, in the preparation method of SAPO-31 molecular sieve, expensive and unsafe aluminum isopropoxide is used as aluminum source, silicon aero...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/54C01B37/08
Inventor 吴伟张瑞赵爱娟吴会敏
Owner HEILONGJIANG UNIV