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Process for preparing SAPO molecular sieve

A molecular sieve and crystallization liquid technology, applied in the direction of molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of low production capacity and slow crystallization speed of SAPO molecular sieve, and achieve the effect of accelerating the synthesis speed

Active Publication Date: 2008-10-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is that the crystallization speed of the SAPO molecular sieve is relatively slow and the production capacity is low in the prior art, and a new preparation method of the SAPO molecular sieve is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 12.2 parts of γAl 2 o 3 Mix uniformly with 30.0 parts of deionized water to form solution a; 23.5 parts of orthophosphoric acid (85% by weight), 1.82 parts of hydrofluoric acid (40% by weight) and 37.5 parts of deionized water are mixed uniformly to form solution b; After stirring at room temperature for 3.0 hours, a homogeneous gum c was formed. Keep stirring, add 9.0 parts of silica sol and 18.0 parts of triethylamine to c successively, add 3.5 parts of small crystal molecular sieve seeds (average particle size is 0.8 microns), mix evenly and put into a crystallization kettle with a volume of 1 cubic meter , react at 200°C and autogenous pressure for 4 hours to obtain molecular sieve products with high crystallinity. The molecular sieve is combined with the carrier, and its catalytic performance is evaluated as 82.3% after spray molding and roasting.

Embodiment 2～5

[0027] The operating steps and test conditions are exactly the same as in Example 1, except that the particle size of the molecular sieve seed crystals added is changed, and the results obtained are shown in Table 2.

[0028] Table 2

[0029] Example

Embodiment 6～9

[0031] The operation steps and test conditions are exactly the same as in Example 1, except that the percentage of molecular sieve seed crystals added to the synthesized molecular sieve is changed. The results obtained are shown in Table 3.

[0032] table 3

[0033]

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PUM

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Abstract

The invention relates to a method for preparing a SAPO molecular sieve and mainly solves the problem that the SAPO molecular sieve has low crystallization speed and low production capacity in the prior art. The method comprises the following steps: (a) evenly mixing a phosphorous source, an aluminum source, a silicon source and water to form a crystallized solution I; (b) adding small-grain solid seed crystals with the diameter of the crystals being less than 1 micron to the crystallized solution I to form a crystallized solution II; (c) subjecting the crystallized solution II to hydrothermal crystallization at the temperature of 110 DEG C to 260 DEG C for at least 0.1 hours to obtain the SAPO molecular sieve; and d) recycling the molecular sieve product. By the technical proposal, the problem in the prior art is well solved, so that the method can be used in the process of preparing alkenes catalyst with oxygenated chemicals.

Description

technical field [0001] The invention relates to a preparation method of SAPO molecular sieve. Background technique [0002] Ethylene and propylene can be used to produce plastics and other chemical products, and are important organic chemical raw materials. With the progress and development of modern society, their demand is increasing. At present, more than 98% of the world's ethylene production comes from steam cracking technology, and propylene production is mainly obtained in two forms: the co-product of steam cracking to produce ethylene and the by-product of catalytic cracking in refineries. Due to the continuous growth of oil demand, limited production capacity growth and the non-renewability of oil resources, the price of crude oil has risen in recent years, causing the production costs of ethylene and propylene to rise accordingly, and the proven oil resources can only be exploited according to the current production level For nearly 50 years, the development of un...

Claims

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Application Information

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IPC IPC(8): C01B39/54C01B37/08
Inventor 刘红星谢在库陆贤王伟钱堃张玉贤
Owner CHINA PETROLEUM & CHEM CORP
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