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Method of synthesizing silicon phosphorus aluminium molecular sieve

A silicon-phosphorus-aluminum molecular sieve and silicon source technology, applied in molecular sieve catalysts, molecular sieves and alkali-exchanged phosphates, molecular sieve characteristic silicon-aluminophosphates, etc., can solve the problems of low selectivity of low-carbon olefins, large molecular sieve grains, and high synthesis costs problem, to achieve the effect of improving catalytic performance, uniform particle size, and benefiting acid control

Active Publication Date: 2005-03-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the high synthesis cost of SAPO-34 molecular sieve in the technology of previous documents or the molecular sieve crystal grain obtained by synthesis is relatively large, and the selectivity of low-carbon olefins is low when used for methanol conversion to produce low-carbon olefins, and the coking rate Quick question, provide a new method for synthesizing silicon phosphorus aluminum molecular sieves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2 and comparative example 1～2

[0018] Synthesis of SAPO-34 Molecular Sieve

[0019] According to the formula (x·TEAOH+y·Morpholine): 0.6SiO 2 :Al 2 o 3 :P 2 o 5 : 60H 2 O Weigh the raw material. The values ​​of x and y are shown in Table 1.

[0020] Example

product number

TEAOH: Morpholine (mol)

XRD

Grain size (micron)

Comparative example 1

S-01

1.0∶0.0

SAPO-34

0.6

Example 1

S-02

0.2∶0.8

SAPO-34

1.8

Example 2

S-03

0.1∶0.9

SAPO-34

17

Comparative example 2

S-04

0∶1.0

SAPO-34

35

[0021] A certain amount of γ-Al 2 o 3 ·H 2 O and fully stir and mix with orthophosphoric acid aqueous solution to form a uniform jelly. Keep stirring, add silica sol, template agent morpholine and a small amount of tetraethylammonium hydroxide in sequence, and finally add a certain amount of deionized water. After fully stirring, a crystallization mixed liquid is formed. The cryst...

Embodiment 3

[0024] Preparation of SAPO-34 Molecular Sieve Catalyst

[0025] The original powders S-01, S-02, S-03 and S-04 prepared in Examples 1-2 and Comparative Examples 1-2 were sequentially roasted at 600°C for 3.0 hours to remove the template agent, and then tableted 1. After crushing, sieve the 30-mesh particle size, and obtain catalysts serially numbered CS-01, CS-02, CS-03 and CS-04, pending evaluation.

Embodiment 4

[0027] SAPO-34 molecular sieve catalyst

[0028] Using a fixed-bed catalytic reaction device, CS-01, CS-02, CS-03 and CS-04 obtained in Example 3 were respectively subjected to catalyst evaluation experiments. The experimental conditions are that the catalyst loading is 1.46 grams, the reaction temperature is 450°C, the reaction pressure is normal pressure, and the weight space velocity of methanol and water is 1.25 hours respectively. -1 and 3.75 hours -1 , the nitrogen flow rate is 50 ml / min. The results are shown in Table 2.

[0029] sample

Methanol

Conversion rates

(weight%)

reaction

time *

(Hour)

Hydrocarbon product distribution (wt%)

CH 4

C 2 h 6

C 2 h 4

C 3 h 8

C 3 h 6

C 4 h 10

C 4 h 8

C 5 +

C 2 ＝ ~C 4 ＝

CS-01

100％

6.0

1.74

0.35

54.24

0.56

33.09

0.089

8.21

2....

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PUM

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Abstract

A process for synthesizing SiPAl molecular sieve used for preparing low-carbon olefin from methanol features that tetra-ethyl ammonium hydroxide and morpholine are used as composite template to prepare SAPO-34 molecular sieve with low cost and high crystallinity.

Description

technical field [0001] The invention relates to a method for synthesizing a silicon phosphorus aluminum molecular sieve, in particular to a method for synthesizing a silicon phosphorus aluminum molecular sieve SAPO-34. Background technique [0002] Synthetic silicon phosphorus aluminum molecular sieve SAPO-34 is a molecular sieve with chabazite-like structure composed of silicon, aluminum, phosphorus and oxygen. Its structural unit consists of PO 2 + , AlO 2 - and SiO 2 tetrahedron composition. Anhydrous chemical composition can be expressed as: mR (Si a ·Al b ·P c )O 2 , in the above formula, R is the template agent present in the micropores of the molecular sieve crystal, m is the mole number of R, a, b, and c are respectively the mole fractions of Si, Al, and P, and satisfy a+b+c=1. European patent EP0103117 discloses a hydrothermal synthesis method of SAPO-34 molecular sieve. One of its technical characteristics is that tetraethy...

Claims

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Application Information

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IPC IPC(8): B01J29/85C01B37/08C01B39/54
Inventor 陈庆龄谢在库刘红星陆贤张玉贤
Owner CHINA PETROLEUM & CHEM CORP
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