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A kind of preparation method of silica-alumina microporous molecular sieve

A microporous molecular sieve and silicon-alumina technology, which is applied in the directions of crystalline aluminosilicate zeolite, mordenite crystalline aluminosilicate zeolite, A-type crystalline aluminosilicate zeolite, etc., can solve the problems of long stirring time, deposition and small stirring torque. , to achieve the effect of convenient product processing, good application prospects and wide applicability

Inactive Publication Date: 2018-03-20
SHANXI DATONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional stirring uses magnetic stirring in beakers or flasks. The stirring torque is relatively small, and the uniformity of the silicon source and aluminum source sol cannot be controlled or the stirring time is too long, which often causes crystals to stick or deposit at the bottom of the reactor. The synthesis rate of microporous molecular sieve is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Select XFD-1.5 flotation machine, add 800mL deionized water and 7.5g NaOH to the flotation cell of A flotation machine, turn on the flotation machine agitator, and move half of the solution into the flotation cell of B flotation machine Middle; add 80g of sodium aluminate into the flotation cell of A flotation cell and stir for 10min at a stirring speed of 1650r / min, and open the air intake valve of the flotation cell and adjust the air intake to 0.05m 3 / h; Add 155g sodium metasilicate to the flotation tank of B flotation machine and stir for 5min, the stirring speed is 1650r / min, and open the air intake valve of the flotation machine and adjust the air intake to 0.05m 3 / h; the solution in the flotation cell of B flotation machine is moved into the flotation cell of A flotation cell, stirred at 1900r / min for 10min and air intake bubbling; finally stop bubbling, and slowly stir to move the sol into poly In a tetrafluoroethylene reaction kettle; put the reaction kettle ...

Embodiment 2

[0049] Select the XFD-1.5 flotation machine, dissolve 155g NaOH and 105g KOH in 350mL deionized water and add them to the flotation cell of A flotation machine, and turn on the flotation machine stirrer. Add 112g of sodium aluminate and 150mL of deionized water into the flotation tank of B flotation machine and stir at a stirring speed of 1850r / min, and open the air intake valve of the flotation machine and adjust the air intake to 0.05m 3 / h; the solution in the flotation cell of B flotation machine is moved into the flotation cell of A flotation cell, stirred at 2100r / min for 10min and air is bubbled. Then add 230g of sodium silicate and 350mL of deionized water into the flotation cell of B flotation cell and stir for 10min at a stirring speed of 1650r / min, and open the air intake valve of the flotation cell and adjust the air intake to 0.05m 3 / h. Move the solution in the flotation cell of B flotation machine to the flotation cell of A flotation cell, stir at 2100r / min for...

Embodiment 3

[0051] Select XFD-1.5 flotation machine, dissolve 8g NaOH and 4.2g sodium aluminate in 50mL deionized water and add them to the flotation tank of A flotation machine, turn on the flotation machine stirrer, and add 45g after it is completely dissolved Sodium silicate, continue to stir for 15 minutes and then age at room temperature for 24 hours. Add 0.3g NaOH, 26g sodium aluminate and 300mL deionized water into the flotation cell of B flotation machine and stir at a stirring speed of 1850r / min, and open the air intake valve of the flotation machine and adjust the air intake to 0.01m 3 / h; Add 284g of sodium silicate and continue stirring for 10min. Move the solution in the flotation cell of the A flotation machine into the flotation cell of the B flotation machine, stir for 20 min at 2100 r / min and bubble the air. Stop bubbling and stir slowly, move the sol into a polytetrafluoroethylene reactor, and age at room temperature for 24 hours. Place the reaction kettle in an oven f...

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Abstract

The invention discloses a preparation method of a silicon-aluminum microporous molecular sieve, and belongs to the field of porous material preparation. The preparation method comprises the following steps of compounding a silicon-aluminum microporous material by utilizing a flotation machine; adopting two flotation machines to work at the same time, uniformly dispersing sol through high-speed stirring and bubbling, bringing out excess shapeless sol through bubbles, and forming regular micropores in sol-gel in short time, thus preparing a silicon-aluminum microporous molecular sieve material which is high in compounding rate. The preparation method disclosed by the invention is simple in operation process, convenient to dispose products and easy to promote.

Description

technical field [0001] The invention relates to a method for preparing a silica-alumina microporous molecular sieve, which belongs to the field of porous material preparation. Background technique [0002] Microporous zeolite was discovered by Swedish scientist A.F.Cronstedt as early as 1756. In the 1940s, Barrer R. M. successfully synthesized zeolite molecular sieves through alkali and silicate under hydrothermal conditions. In 1961, the quaternary ammonium base was introduced into the zeolite synthesis system, and the microporous zeolite molecular sieve was synthesized with the directing agent or template agent. The material has the characteristics of regular structure, fixed pore type, large specific surface area and strong adsorption capacity. There are more than 160 kinds of microporous molecular sieves, such as type A, type X, type Y and ZSM-5. [0003] The synthesis of microporous molecular sieves generally adopts hydrothermal synthesis or solvothermal synthesis, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02C01B39/26C01B39/22C01B39/24C01B39/16
CPCC01B39/02C01B39/16C01B39/22C01B39/24C01B39/26
Inventor 吕存琴张继龙刘建红郭永晋春费鹏张进
Owner SHANXI DATONG UNIV
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