Silicoaluminophosphate molecular sieve and preparation method and application thereof

A silicoaluminophosphate and molecular sieve technology, applied in the direction of molecular sieve and alkali exchange phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of low carbon olefin selectivity, low raw material conversion rate, large molecular sieve grain size, etc. Achieve high selectivity, easy industrial production, and long catalyst life.

Active Publication Date: 2010-10-13
YANKUANG ENERGY R&D CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] CN1590295A In order to solve the problems of high synthesis cost of SAPO-34 molecular sieve in the prior art or the molecular sieve crystal grains obtained by synthesis are relatively large, and the relative crystallinity is low, SAPO-34 is prepared by using tetraethylammonium hydroxide and morpholine as a composite template Molecular sieve, and used in the reaction of methanol conversion to light olefins
[0006] But these catalysts are used in the reaction of methanol to low-carbon olefins, the conversion rate of raw materials is not high, especially the deactivation rate is fast, the life is short, and the selectivity to low-carbon olefins is low.

Method used

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  • Silicoaluminophosphate molecular sieve and preparation method and application thereof
  • Silicoaluminophosphate molecular sieve and preparation method and application thereof
  • Silicoaluminophosphate molecular sieve and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0026] Synthesis of SAPO-34 Molecular Sieve

[0027] According to the ratio: Al 2 o 3 :P 2 o 5 : 0.6SiO2 2 :xTEAOH:yDEA:(2-x-y)TEA:53H 2 O Weigh the raw materials, and the values ​​of x and y are shown in Table 1.

[0028] Mix a certain amount of pseudo-boehmite, phosphoric acid, and deionized water in a certain order, and stir thoroughly for a certain period of time until uniform, then add 30% silica sol, and after fully stirring, slowly mix the three template agents TEAOH, DEA, and TEA successively Add it to the mixture, and then stir it for a certain period of time to form a gel. The prepared gel was transferred into a high-pressure titanium alloy reactor, sealed, kept stirring under its own pressure, and crystallized by temperature programming, crystallization at 110°C for 24 hours, and crystallization at 200°C for 72 hours. Take out the solid product, wash it repeatedly with deionized water until it becomes neutral, and place it in a drying oven at 110°C to dry ove...

Embodiment 4

[0040] Preparation of SAPO-34 Molecular Sieve Catalyst

[0041] The original powders of silicoaluminophosphate molecular sieves synthesized in Examples 1-3 and Comparative Examples 1-4 were S-TDT1, S-TDT2, S-TDT3, S-TEAOH, S-DEA, S-TEA, S-TEDE Calcined at 550°C for 4.0 hours to remove the template agent, cooled to room temperature, and after tableting and crushing, sieve molecular sieve particles with a particle size of 80-100 mesh, which are sequentially numbered as C-TDT1, C-TDT2, C-TDT3, C-TEAOH, C-DEA, C-TEA, C-TEDE catalysts, pending evaluation.

Embodiment 5

[0043] SAPO-34 Molecular Sieve Catalyst Evaluation Reaction 1

[0044] Using a fixed bed catalytic reaction device, the reactor is a stainless steel tube, and the catalysts C-TDT1, C-TDT2, C-TDT3, C-TEAOH, C-DEA, C-TEA, and C-TEDE prepared in Example 4 are respectively subjected to MTO The reaction activity evaluation, the technological conditions used in the evaluation are: the loading amount of catalyst is 1.5 grams, the reaction temperature is 425°C, the reaction pressure is normal pressure, the raw material is 99.50mol% methanol, and the mass space velocity is 1.0 hour -1 , the nitrogen flow rate is 60 ml / min. After gas-liquid separation of the product, the gas phase product was analyzed online by gas chromatograph GC6890N, and the liquid phase product was analyzed by gas chromatograph GC6820. The evaluation results are shown in Table 3.

[0045] Table 3 Results of Methanol Conversion to Light Olefins

[0046]

[0047] * The activity time is defined as the time at wh...

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Abstract

The invention relates to a silicoaluminophosphate molecular sieve and a preparation method and application thereof. The structure formula of the molecular sieve is (0.2-3.0) R: (Si0.01-0.3Al0.01-1P0.01-0.9 ):(10-400) H2O, and three templates, a silicon source, an aluminum source and a phosphorus source are mixed with water to form gel, and then the silicoaluminophosphate molecular sieve can be obtained by the steps of crystallization and drying. Compared with the preparation methods of the molecular sieve with single template and double templates in the prior art, the invention is taken as a catalyst and is applied to the reaction of light olefins from methanol, can improve the conversion rate of raw materials, delay coking rate, prolong reaction activity time, and improve the selectivities of ethylene and propylene, and simultaneously solve the problem that the synthesis cost of the silicoaluminophosphate molecular sieve is high in the prior art.

Description

technical field [0001] The present invention relates to a kind of molecular sieve and its preparation method and application, especially to the preparation method of silicoaluminophosphate molecular sieve with three templates (tetraethylammonium hydroxide / diethylamine / triethylamine) and its use as a catalyst in Application in the conversion of methanol to light olefins (MTO). Background technique [0002] Low-carbon olefins, especially ethylene and propylene, as basic organic chemical raw materials, play a pivotal role in modern petroleum and chemical industries. The production methods of olefins can be divided into two categories: one is the petroleum route, and the other is the non-petroleum route. But for oil, the price continues to rise for a long time, the supply is unstable, and the resource reserves are limited. Therefore, it is not enough to increase the production of ethylene and propylene by relying on the traditional petroleum route. Methanol-to-Olefins (MTO for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08
Inventor 孙启文应卫勇刘继森房鼎业张宗森曹发海叶丽萍李涛
Owner YANKUANG ENERGY R&D CO LTD
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