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Sapo-34 molecular sieve and its preparation method and application

A SAPO-34, molecular sieve technology, applied in the field of molecular sieve, can solve the problem of high preparation cost, achieve the effects of high selectivity, reduced raw material cost, easy washing and separation

Active Publication Date: 2021-05-07
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of SAPO-34 molecular sieve and its preparation method and application in order to overcome the high problem of the preparation cost of SAPO-34 molecular sieve existing in the prior art

Method used

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  • Sapo-34 molecular sieve and its preparation method and application
  • Sapo-34 molecular sieve and its preparation method and application

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preparation example Construction

[0011] The present invention provides a kind of preparation method of SAPO-34 molecular sieve on the one hand, this method comprises: aluminum source, phosphorus source, silicon source, templating agent I, templating agent II and water are contacted to carry out crystallization reaction, and crystallization reaction obtains The solid product is dried and calcined, wherein, the template agent I is morpholine and / or triethylamine, and the template agent II is tetramethylammonium bicarbonate and / or tetraethylammonium nitrate.

[0012] In the present invention, the aluminum source, phosphorus source, and silicon source can be materials commonly used in the art to prepare SAPO-34 molecular sieves. Preferably, the aluminum source is pseudoboehmite, aluminum sol, alumina , at least one of soluble aluminum salt and aluminum isopropoxide, the phosphorus source is at least one of phosphoric acid, diphosphoric acid, metaphosphoric acid, diammonium hydrogen phosphate (more preferably phosp...

Embodiment 1

[0028] Mix pseudo-boehmite, phosphoric acid, aminopropyltrimethoxysilane, morpholine, tetramethylammonium bicarbonate and deionized water evenly, wherein the pseudo-boehmite is Al 2 o 3 In terms of phosphoric acid in P 2 o 5 In terms of aminopropyltrimethoxysilane as SiO 2 Calculated, the molar ratio of pseudo-boehmite, phosphoric acid, aminopropyltrimethoxysilane, morpholine, tetramethylammonium bicarbonate and deionized water is 1:0.9:0.75:0.05:1.8:60, and the crystallization After stirring evenly, crystallize at 210°C for 60 hours, take out the product, centrifuge to separate the solid product, wash the solid product with water, and dry it at 90°C for 8 hours to obtain the original SAPO-34 molecular sieve powder with a cubic structure. -34 molecular sieve raw powder was calcined at 600° C. for 5 hours to obtain SAPO-34 molecular sieve A1 with a particle size of 1-3 μm and cubic structure. The total diene selectivity of the SAPO-34 molecular sieve at 100% methanol conver...

Embodiment 2

[0031] Mix aluminum sol, phosphoric acid, ethyl orthosilicate, morpholine, tetraethylammonium nitrate and deionized water evenly, wherein the aluminum sol is Al 2 o 3 In terms of phosphoric acid in P 2 o 5 In terms of tetraethyl orthosilicate as SiO 2 Calculated, the molar ratio of aluminum sol, phosphoric acid, ethyl orthosilicate, morpholine, tetraethylammonium nitrate and deionized water is 1:1.4:0.15:5:0.2:18, prepare the crystallization solution, stir evenly, Crystallize at 160°C for 8 hours, take out the product, centrifuge to separate the solid product, wash the solid product with water and dry it at 150°C for 4 hours to obtain the cube-structured SAPO-34 molecular sieve raw powder, the SAPO-34 molecular sieve raw powder in Calcined at 480° C. for 10 h to obtain SAPO-34 molecular sieve A2 with a cubic structure with a particle size of 2-4 μm. The total diene selectivity of the SAPO-34 molecular sieve was 87.77% at 100% methanol conversion in methanol conversion to o...

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Abstract

The invention relates to the field of molecular sieves, and discloses a SAPO-34 molecular sieve and its preparation method and application. The method comprises: contacting an aluminum source, a phosphorus source, a silicon source, a template agent I, a template agent II and water for a crystallization reaction, and crystallizing the The solid product obtained by chemical reaction is dried and roasted, and it is characterized in that, described templating agent I is morpholine and / or triethylamine, and described template agent II is tetramethylammonium bicarbonate and / or tetraethylammonium nitrate. The templating agent used in the method is cheap, which effectively reduces the cost of raw materials; the prepared SAPO-34 molecular sieve has a small particle size, and in the actual industrial process, washing and separation are easier, can solve the problem of high separation cost, and are more suitable for industrial production; ‑34 molecular sieve has good activity in the conversion of methanol to olefins, and has high selectivity for dienes (ethylene and propylene).

Description

technical field [0001] The invention relates to the field of molecular sieves, in particular to a method for preparing a SAPO-34 molecular sieve, a SAPO-34 molecular sieve obtained by the method, and an application of the SAPO-34 molecular sieve. Background technique [0002] SAPO-34 molecular sieve is a crystalline silicoaluminophosphate whose molecular sieve framework is made of PO 4 , AlO 4 and SiO 4 The three-dimensional skeleton structure formed by the interconnection of tetrahedrons has an ellipsoidal cage structure composed of oxygen eight-membered rings and a three-dimensional pore structure. Due to its good selectivity of low-carbon olefins and excellent hydrothermal stability, this molecular sieve has become a development Molecular sieve is the preferred catalyst for methanol-to-olefins reaction, and it is widely used in industrial production units as an active component catalyst. The commonly used synthetic method of SAPO-34 molecular sieve is hydrothermal synt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/54C01B37/08B01J29/85
CPCB01J29/85C01B37/08C01B39/54C01P2002/72C01P2004/03C01P2004/61
Inventor 邱正璞田大勇张新峰杨虹姜继东孙琦
Owner CHNA ENERGY INVESTMENT CORP LTD
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