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Method for preparing aluminium silicophosphate molecular sieve

A silicon-phosphorus-aluminum molecular sieve and phosphorus source technology, applied in molecular sieve catalysts, molecular sieves and alkali-exchanged phosphates, molecular sieve characteristic silicon-aluminophosphates, etc., can solve the problems of large molecular sieve grains, low relative crystallinity, and fast coking rate , to achieve uniform particle size, increase relative crystallinity, increase specific surface area and pore volume

Inactive Publication Date: 2004-01-14
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 previous literature or the molecular sieve crystal grain obtained by synthesis is relatively large, the relative crystallinity is low, and the coking rate is fast when used for methanol conversion to produce low-carbon olefins. , to provide a new preparation method of silicon phosphorus aluminum molecular sieve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] SAPO-34 molecular sieve preparation 1 (adding fluoride)

[0021] 12.2g γ-Al 2 O 3 Mix with 30.0 grams of deionized water to form solution a; 23.5 grams of orthophosphoric acid (85% by weight), 1.82 grams of hydrofluoric acid (40% by weight) and 37.5 grams of deionized water are mixed to form solution b; after a and b are mixed, After stirring for 3.0 hours at room temperature, a homogeneous gel c was formed. Keep stirring, add 9.0 grams of silica sol, 18.0 grams of triethylamine and 23.2 grams of deionized water to c. After thorough stirring, a crystalline mixture d is formed. Liquid d was crystallized at 200°C for 48 hours. The product was centrifuged to obtain a solid product, which was dried overnight in an oven at 110°C. Tests showed that the product obtained was SAPO-34 molecular sieve with a relative crystallinity of 100%. The crystal size is 2.3μm and the specific surface area is 535.9 meters 2 / G, the pore volume is 0.28 cm 3 / G. [Example 2]

Embodiment 2

[0022] According to the steps and conditions of Example 1, only changing the crystallization temperature to 150°C and the crystallization reaction time to 90 hours, the test shows that the product obtained is SAPO-34 molecular sieve, the relative crystallinity is 98%, and the crystal size is 2.5μm. , The specific surface area is 527.2 meters 2 / G, the pore volume is 0.26 cm 3 / G. [Example 3]

Embodiment 3

[0023] According to the steps and conditions of Example 1, only changing the crystallization temperature to 225°C and the crystallization reaction time to 40 hours. Tests show that the product obtained is SAPO-34 molecular sieve with a relative crystallinity of 97% and a crystal size of 2.9μm. , The specific surface area is 523.5 meters 2 / G, the pore volume is 0.25 cm 3 / G. [Example 4]

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PUM

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Abstract

A process for preparing Si-P-Al molecular sieve SAPO-34 used to prepare low-carbon olefine from methanol features that the triethylamine and fluoride are used as composite template agent. Its advantages are low cost and fine crystal grains of molecular sieve.

Description

Technical field [0001] The present invention relates to a preparation method of silicon-phosphoaluminum molecular sieve, particularly to a preparation method of silicon-phosphoaluminum molecular sieve SAPO-34. Background technique [0002] Synthetic silicophosphate aluminum molecular sieve SAPO-34 is a molecular sieve with a chabazite-like structure composed of silicon, aluminum, phosphorus, and oxygen. Its structural unit is composed of PO 2 + , AlO 2 - And SiO 2 Tetrahedron structure. The anhydrous chemical composition can be expressed as: mR·(Si x ·Al y ·P z )O 2 In the above formula, R is the templating agent existing in the pores of the molecular sieve crystal, m is the number of moles of R, x, y, and z are the mole fractions of Si, Al, and P, respectively, and satisfy x+y+z=1. European patent EP0103117 discloses a hydrothermal synthesis method of SAPO-34 molecular sieve. One of its technical features is the use of tetraethylammonium hydroxide, isoprop...

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
Owner CHINA PETROLEUM & CHEM CORP