SAPO-34 molecular sieve aggregate, preparation method thereof and method for preparing olefin from methanol

A SAPO-34 molecular technology, applied in molecular sieves and alkali exchange phosphates, molecular sieve catalysts, molecular sieve characteristic silicoaluminophosphates, etc., can solve problems such as carbon deposition, reduce molecular sieve production costs, and low selectivity

Active Publication Date: 2019-05-24
CHNA ENERGY INVESTMENT CORP LTD +1
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Problems solved by technology

[0008] The purpose of the present invention is to provide SAPO-34 molecular sieve aggregates and a preparation method thereof and a method for methanol to olefins in order to overcome the low selectivity and easy generation of carbon deposits in conventional SAPO-34 molecular sieves for methanol-to-olefins products. -34 molecular sieve aggregates are micron cubes formed...

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  • SAPO-34 molecular sieve aggregate, preparation method thereof and method for preparing olefin from methanol
  • SAPO-34 molecular sieve aggregate, preparation method thereof and method for preparing olefin from methanol
  • SAPO-34 molecular sieve aggregate, preparation method thereof and method for preparing olefin from methanol

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preparation example Construction

[0027] The first aspect of the present invention provides a kind of preparation method of SAPO-34 molecular sieve aggregate, comprising:

[0028] (1) The solution obtained by mixing aluminum source, phosphorus source, silicon source, triethylamine, triethylamine hydrochloride and water is subjected to hydrothermal crystallization; wherein,

[0029] In the solution, the aluminum source is Al 2 o 3 Calculated, phosphorus source as P 2 o 5 meter, silicon source as SiO 2 Calculated, the mol ratio of described aluminum source, phosphorus source, silicon source, triethylamine, triethylamine hydrochloride and water is:

[0030] Al 2 o 3 :P 2 o 5 : SiO 2 : Triethylamine: Triethylamine hydrochloride: H 2 O=1: (0.9~1.1): (0.1~0.5): (1.5~3): (0.1~0.5): (15~50);

[0031] (2) Separating the product obtained by hydrothermal crystallization in step (1) from solid to liquid, washing, drying and roasting the obtained solid to obtain the SAPO-34 molecular sieve aggregate.

[0032] I...

Embodiment 1

[0054] Pseudoboehmite, phosphoric acid, silica sol, triethylamine, triethylamine hydrochloride and deionized water were added to the reaction kettle, stirred at room temperature (25°C) at a stirring rate of 500rpm for 4h, and the above-mentioned components in the obtained solution The molar ratio of the components is Al 2 o 3 :P 2 o 5 : SiO 2 : Triethylamine: Triethylamine hydrochloride: H 2 O=1:1.0:0.25:1.5:0.5:20.

[0055] Hydrothermal crystallization was carried out at the temperature of the reactor, and the crystallization was carried out at a temperature of 200° C. and a pressure of 2 MPa for 24 hours.

[0056] The product after crystallization was separated by filtration, and the obtained solid was washed with deionized water. Dry at 120°C for 2 hours, and bake at 550°C for 3 hours to obtain SAPO-34 molecular sieve aggregates.

[0057] The SAPO-34 molecular sieve aggregates were analyzed by XRD spectrum, figure 1 The obtained XRD pattern shows SAPO-34 crystals. ...

Embodiment 2

[0061] Pseudoboehmite, phosphoric acid, silica sol, triethylamine, triethylamine hydrochloride and deionized water were added to the reaction kettle, stirred at room temperature (40°C) at a stirring rate of 100rpm for 3h, and the above-mentioned components in the obtained solution The molar ratio of the components is Al 2 o 3 :P 2 o 5 : SiO 2 : Triethylamine: Triethylamine hydrochloride: H 2 O=1:0.9:0.12:2.0:0.4:50.

[0062] Hydrothermal crystallization was carried out at the temperature of the reactor, and the crystallization was carried out at a temperature of 190° C. and a pressure of 3 MPa for 12 hours.

[0063] The product after crystallization was separated by filtration, and the obtained solid was washed with deionized water. Dry at 100°C for 1.5h, and bake at 500°C for 5h to obtain SAPO-34 molecular sieve aggregates.

[0064] The XRD spectrum analysis of the SAPO-34 molecular sieve aggregates showed that they were SAPO-34 crystals.

[0065] The SAPO-34 molecula...

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Abstract

The invention relates to the field of SAPO-34 molecular sieves, and discloses an SAPO-34 molecular sieve aggregate, a preparation method thereof and a method for preparing olefin from methanol. The preparation method comprises the following steps of: (1) carrying out hydrothermal crystallization on a solution obtained by mixing an aluminum source, a phosphorus source, a silicon source, triethylamine, triethylamine hydrochloride and water; wherein in the solution, when Al2O3 is taken as the aluminum source, P2O5 as the phosphorus source, and SiO2 as the silicon source, the molar ratio of the aluminum source to the phosphorus source to the silicon source to triethylamine to triethylamine hydrochloride to water is 1: (0.9-1.1) : (0.1-0.5) : (1.5-3) : (0.1-0.5) : (15-50) ; (2) carrying out solid-liquid separation on the product obtained by hydrothermal crystallization in step (1), and washing, drying and roasting the obtained solid to obtain the SAPO-34 molecular sieve aggregate. The aggregate can be used as a catalyst in a reaction to prepare olefin by using methanol to improve the selectivity of the low-carbon olefin, inhibit the generation of carbon deposit and prolong the service life of the catalyst.

Description

technical field [0001] The invention relates to the field of SAPO-34 molecular sieves, in particular to a preparation method of SAPO-34 molecular sieve aggregates, the SAPO-34 molecular sieve aggregates prepared by the method and a method for producing methanol to olefins using the SAPO-34 molecular sieve aggregates. Background technique [0002] The silicoaluminophosphate (SAPO) series molecular sieves are new molecular sieves developed by Union Carbide Corporation (UCC) in 1984, and SAPO-34 is one of them. Its crystal structure is chabazite type (CHA), and the pore size is 0.43nm. It has special water absorption performance and proton acidity, and can be used as adsorbent, catalyst and catalyst carrier. Due to the unique small pore structure and suitable medium-strength acidity of SAPO-34, it exhibits high activity and selectivity in the reaction of methanol / dimethyl ether to low-carbon olefins (MTO), and the products are low-carbon olefins The selectivity is higher than ...

Claims

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Application Information

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IPC IPC(8): C01B39/54C01B37/08B01J29/85C07C1/20C07C11/02
CPCY02P20/52
Inventor 田大勇张新锋姜继东杨虹孙琦
Owner CHNA ENERGY INVESTMENT CORP LTD
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