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Method for synthesizing L-shaped molecular sieve by utilizing aluminum-silicon filter residue

A technology of molecular sieve and filter residue, which is applied in the field of hydrothermal synthesis of zeolite molecular sieve, can solve the problems of high production cost, long crystallization time, waste of silicon source, etc., and achieve the effect of increasing product added value, reducing feed ratio, and reducing waste

Active Publication Date: 2013-05-22
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the traditional method to synthesize L-type molecular sieves has a high ratio of silicon to aluminum, resulting in a great waste of silicon sources and a long crystallization time. Correspondingly, the yield of L-type molecular sieves is low and the production cost is high.

Method used

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  • Method for synthesizing L-shaped molecular sieve by utilizing aluminum-silicon filter residue
  • Method for synthesizing L-shaped molecular sieve by utilizing aluminum-silicon filter residue
  • Method for synthesizing L-shaped molecular sieve by utilizing aluminum-silicon filter residue

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Table 1 The chemical composition analysis results wB% of the aluminum-silicon filter residue

[0018]

[0019] Accurately weigh 5.09g of aluminum-silicon filter residue (see Table 1 for chemical composition analysis results), 14.73g of potassium silicate solution, 1.52g of potassium hydroxide, 17.11g of distilled water, and SiO in the mixture system 2 / Al 2 o 3 The molar ratio is 6, K 2 O / SiO 2 The molar ratio of H is 0.32, H 2 O / SiO 2 The molar ratio is 17, wherein K in the potassium silicate solution 2 The mass fraction of O is 11.5%, SiO 2 The mass fraction is 24%. After mixing and stirring evenly, add 3g of directing agent. The composition of the directing agent is: 5.7Na 2 O·5.4K 2 O·Al 2 o 3 ·30SiO2 2 ·500H 2 O, after fully stirring, put it into a stainless steel reaction kettle with a polytetrafluoroethylene liner, hydrothermally crystallize at 170°C for 12 hours, filter after cooling, wash the filter cake with distilled water until the pH of the f...

Embodiment 2

[0021] Accurately weigh 65.24g of aluminum-silicon filter residue (see Table 1 for chemical composition analysis results), 227.7g of potassium silicate solution, 28.8g of potassium hydroxide, 265.6g of distilled water, SiO 2 / Al 2 o 3 The molar ratio is 6.8, K 2 O / SiO 2 The molar ratio of H is 0.37, H 2 O / SiO 2 The molar ratio is 18, wherein K in the potassium silicate solution 2 The mass fraction of O is 11.5%, SiO 2 The mass fraction is 24%. After mixing and stirring evenly, add 49.8g of the directing agent. The composition of the directing agent is: 5.7Na 2 O·5.4K 2 O·Al 2 o 3 ·30SiO2 2 ·500H 2 O, after fully stirring, put it into a stainless steel reaction kettle with a polytetrafluoroethylene liner, hydrothermally crystallize at 170°C for 8 hours, filter after cooling, wash the filter cake with distilled water until the pH of the filtrate is 9-10, filter After the cake is dried, it becomes L-type molecular sieve.

[0022] Table 2 Comparison of lattice constan...

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Abstract

The invention relates to a process for synthesizing an L-shaped molecular sieve by utilizing aluminum-silicon filter residue. The process comprises the following steps: uniformly mixing the residual aluminum-silicon filter residue obtained after extracting potassium from kaliophilite powder, potassium silicate solution, potassium hydroxide and water according to a ratio, adding a guiding agent, and performing hydrothermal crystallization for 8-20 hours under the condition of the temperature of 150 to 170 DEG C to obtain the well crystallized L-shaped molecular sieve. The molar ratio of SiO2 / Al2O3 is 6-7 in the mixture system for synthesizing the L-shaped molecular sieve, the feeding ratio of synthesizing the L-shaped molecular sieve is greatly reduced, the yield of the L-shaped molecular sieve is improved, the silicon source waste is reduced, and the utilization value of the aluminum-silicon filter residue is improved.

Description

technical field [0001] The invention belongs to the hydrothermal synthesis technology of zeolite molecular sieves, and more specifically relates to a method for hydrothermally synthesizing L-type molecular sieves by utilizing the remaining aluminum-silicon filter residue after potassium extraction from kaponicite powder. Background technique [0002] L-type molecular sieve is a synthetic zeolite first synthesized by Breck and Flanigen in 1965. L-type molecular sieves have unique adsorption and catalytic properties, and also have good thermal stability, and are widely used as catalysts for cracking, reforming, aromatization, alkylation and other processes in the petroleum industry. Traditional synthesis of L-type molecular sieves uses silica sol, white carbon black, potassium silicate or sodium silicate as the silicon source, sodium aluminate, potassium aluminate or aluminum hydroxide as the aluminum source, and potassium hydroxide or sodium hydroxide as the alkali source. ,...

Claims

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Application Information

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IPC IPC(8): C01B39/02B09B3/00
Inventor 苏双青马鸿文刘昶江赵寻
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)