A method for synthesizing high-silicon-aluminum ratio ultrafine nay molecular sieves

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

Active Publication Date: 2018-02-16
SHAANXI COAL & CHEM TECH INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A method for synthesizing high-silicon-aluminum ratio ultrafine nay molecular sieves
  • A method for synthesizing high-silicon-aluminum ratio ultrafine nay molecular sieves
  • A method for synthesizing high-silicon-aluminum ratio ultrafine nay molecular sieves

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Experimental program
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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

A method for synthesizing ultra-fine NaY molecular sieves with high silicon-aluminum ratio, characterized in that firstly, the crystallization mother liquor of high-silicon-aluminum ratio ultra-fine NaY molecular sieves is collected, and inorganic acid and soluble aluminum salt solution are added to adjust pH value to form silica-alumina gel Precipitate and filter to obtain a silica-alumina gel filter cake with a SiO2 / Al2O3 ratio of 17 to 85; part or all of the filter cake is used to prepare a directing agent, and then the reaction gel mixed with a silicon source, an aluminum source and water is added, and the Under dynamic conditions, it undergoes at least three stages of crystallization process controlled by temperature programming. The NaY molecular sieve synthesized by this method has an average grain size of 100-500nm and a skeleton silicon-aluminum ratio (SiO2 / Al2O3) higher than 6.7. The method can realize the full recycling of the silicon source.

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 & AuthorityPatents(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
OwnerSHAANXI COAL & CHEM TECH INST