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Preparation method for silicoaluminophosphate (SAPO)-34 molecular sieve with small crystal particle

A technology of SAPO-34 and molecular sieve, which is applied in the direction of molecular sieve and alkali exchange phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problem of large grain size of SAPO-34

Active Publication Date: 2012-05-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that in prior art in synthetic SAPO-34 molecular sieve process, the product SAPO-34 grain size that obtains is bigger problem, a kind of preparation method of new small crystal grain SAPO-34 molecular sieve is provided

Method used

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  • Preparation method for silicoaluminophosphate (SAPO)-34 molecular sieve with small crystal particle
  • Preparation method for silicoaluminophosphate (SAPO)-34 molecular sieve with small crystal particle
  • Preparation method for silicoaluminophosphate (SAPO)-34 molecular sieve with small crystal particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 12.1 g γAl 2 o 3 Mix with 35.0 grams of deionized water to form solution a; 23.3 grams of orthophosphoric acid (85% by weight), 0.2 gram of hydrofluoric acid (40% by weight), and 37.5 grams of deionized water are mixed to form solution b; a and b are mixed Stir at room temperature for 2 hours to form a homogeneous solution c; keep stirring, add 31 grams of triethylamine, 4.5 grams of silica sol and 27.0 grams of deionized water to c in sequence, and get the initial gel mixture of synthetic SAPO-34 molecular sieve after fully stirring ; This mixture was crystallized at 200° C. for 12 hours, and the quenched crystallization director was taken out; an initial gel mixture was prepared in the same way as described above, and the ratio of 1:1 with the crystallization director (volume ratio) mixed to form solution d; liquid d was crystallized at 200°C for 24 hours, and the product was centrifuged to obtain a solid product, which was dried in an oven at 110°C overnight. XRD te...

Embodiment 2～5

[0036] The operation steps and experimental conditions are the same as in Example 1, except that the crystallization time t of the crystallization directing agent is changed. The results are shown in Table 1.

[0037] Table 1

[0038]

[0039] Note: Diene is "ethylene + propylene".

Embodiment 6

[0041] The crystallization directing agent was prepared at 170° C., and the other operating procedures and experimental conditions were the same as in Example 1. The particle size of the obtained product SAPO-34 was about 0.9 μm.

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Abstract

The invention relates to a preparation method for a silicoaluminophosphate (SAPO)-34 molecular sieve with a small crystal particle, which mainly solves the problem of larger product particle diameter in the SAPO-34 synthesis process in the prior art. The preparation method comprises the following steps: a) preparing an initial gel mixture at the following molar ratio: 0.5-10 moles of SiO2, 0.05-10 moles of Al2O3, 0.2-3 moles of P2O5, 0.001-0.02 moles of hydrogen fluoride (HF) and 20-200 moles of H2O, and stirring and ageing at the room temperature for 1-24h; b) adding the aged mixed solution into a crystallization kettle, carrying out hydrothermal crystallization at the temperature of 170-220DEG C for 0.1-20h, taking out, and quenching to obtain crystallization directing agent; c) according to the step a), preparing the gel mixture again, adding the crystallization directing agent obtained in the step b) to be evenly mixed, loading into the crystallization kettle, and carrying out hydrothermal crystallization at the temperature of 150-260DEG C for 5-48h; and d) recovering a molecular sieve product. According to the technical scheme, the problem is better solved, and the preparation method can be used for the industrial preparation of the SAPO-34 molecular sieve.

Description

technical field [0001] The invention relates to a preparation method of small grain SAPO-34 molecular sieve. Background technique [0002] Low-carbon olefins (ethylene, propylene, etc.), as important basic organic chemical raw materials in the chemical industry, play a pivotal role in the modern petroleum and chemical industries. Ethylene is used to make various polyethylene plastics, and to make other chemicals such as vinyl chloride, ethylene oxide, ethylbenzene, and alcohols. Propylene is used to make various polypropylene plastics, and to make other chemicals such as acrylonitrile and propylene oxide. With the development of my country's national economy, especially the development of modern chemical and chemical industries, the demand for light olefins is increasing day by day, and the contradiction between supply and demand will become increasingly prominent. So far, more than 98% of the world's ethylene production still comes from steam cracking technology, 67% of p...

Claims

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Application Information

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IPC IPC(8): C01B39/54C01B37/08
Inventor 管洪波谢在库刘红星张惠明方敬东
Owner CHINA PETROLEUM & CHEM CORP
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