Method for synthesis of high silica-alumina ratio ultrafine NaY molecular sieve

A high-silicon-aluminum ratio, molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, faux crystalline aluminosilicate zeolite, etc., can solve the problems of low silicon and aluminum, large grain size, etc. The effect of high, narrow size distribution

Active Publication Date: 2015-07-01
陕西煤化工技术工程中心有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, the NaY molecular sieve synthesized by the existing mother liquor recycling technology has a large grain size (average grain size ≥ 1 μm), and a low silicon-aluminum ratio (≤ 5.5)

Method used

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  • Method for synthesis of high silica-alumina ratio ultrafine NaY molecular sieve
  • Method for synthesis of high silica-alumina ratio ultrafine NaY molecular sieve
  • Method for synthesis of high silica-alumina ratio ultrafine NaY molecular sieve

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Embodiment 1

[0038] This embodiment is the preparation of silica-alumina gel.

[0039] Take 40g aluminum sulfate (Al 2 (SO 4 ) 3 18H 2 O) Dissolve in 120g of deionized water, and slowly add 650g of crystallization mother liquor A (sodium oxide 6.5%, silicon dioxide 13.2%) with high silicon-aluminum ratio ultra-fine NaY molecular sieves at 65°C under stirring conditions, and add 98% of Sulfuric acid adjusted the pH of the system to 9.0, stirred for 0.5 h and then filtered to obtain a silica-alumina gel filter cake. According to XRF analysis, the mass fraction of its material composition is: sodium oxide 2.8%, silicon dioxide 89.2%, aluminum oxide 6.5% (SiO 2 / Al 2 o 3 =23.3). Record it as silica-alumina gel filter cake A.

Embodiment 2

[0041] This embodiment is the preparation of silica-alumina gel.

[0042] Take 50g of aluminum sulfate (Al 2 (SO 4 ) 3 18H 2 O) Dissolve in 160g of deionized water, slowly add 650g of crystallization mother liquor of ultra-fine NaY molecular sieve with high silicon-aluminum ratio (sodium oxide 6.5%, silicon dioxide 13.2%) at 80°C and stirring condition, add 98% sulfuric acid Adjust the pH of the system to 7.0, stir for 0.5 h and then filter to obtain a silica-alumina gel filter cake. After XRF analysis, the mass fraction of its material composition is: 4.3% sodium oxide, 87.6% silicon dioxide, 8.0% aluminum oxide (SiO 2 / Al 2 o 3 =18.6). Denoted as silica-alumina gel filter cake B.

Embodiment 3

[0044] This embodiment is the preparation of silica-alumina gel.

[0045] Take 10g of aluminum sulfate (Al 2 (SO 4 ) 3 18H 2 O) Dissolve in 40g of deionized water, slowly add 650g crystallization mother liquor of ultrafine NaY molecular sieve with high silicon-aluminum ratio (sodium oxide 6.3%, silicon dioxide 11.7%) at 80°C and stirring condition, add 98% sulfuric acid Adjust the pH of the system to 6.0, stir for 0.5 h and then filter to obtain a silica-alumina gel filter cake. According to XRF analysis, the mass fraction of its material composition is: sodium oxide 1.1%, silicon dioxide 95.2%, alumina mass fraction 2.0% (SiO 2 / Al 2 o 3 =80.9). Denoted as silica-alumina gel filter cake C.

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Abstract

The invention discloses a method for synthesis of a high silica-alumina ratio ultrafine NaY molecular sieve. The method comprises the following steps of collecting a crystallization mother liquor of a high silica-alumina ratio ultrafine NaY molecular sieve, adding inorganic acid and soluble aluminum salt solution into the crystallization mother liquor so that pH is adjusted and silica-alumina gel precipitates are formed, filtering the precipitates to obtain silica-alumina gel filter cake with a SiO2 / Al2O3 ratio of 17-85, preparing a guiding agent from a part of or all the filter cake, adding reaction gel with a silicon source, an aluminum source and water into the guiding agent, and carrying out at least three programming calefactive control crystallization processes under full dynamic conditions. The NaY molecular sieve has average crystal grain sizes of 100-500nm and a skeleton silica-alumina ratio (SiO2 / Al2O3) higher than 6.7. The method realizes silicon source complete cycle utilization.

Description

technical field [0001] The invention relates to the synthesis of molecular sieves, in particular to a method for synthesizing ultrafine NaY molecular sieves with a high silicon-aluminum ratio. Background technique [0002] Fluid Catalytic Cracking (FCC) is the core technology of modern oil refining industry. Since the 1960s, FAU-type molecular sieves have been used in the FCC process, which not only brings huge economic benefits, but also effectively promotes the rapid development of FCC technology. The active component of the cracking catalyst used in the FCC unit is mainly Y-type molecular sieve (grain size ~ 1 μm), which has high activity and selectivity, and the obtained gasoline fraction contains more alkanes and aromatics and less olefins . However, as the quality of crude oil becomes increasingly heavy and inferior, the proportion of heavy oil blended in each refinery increases year by year, which puts forward higher requirements for the FCC process. The key to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24
Inventor 谭涓张小虎赵强刘靖闵小健李全升张军民刘建斌张世刚
Owner 陕西煤化工技术工程中心有限公司
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