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Method for directly synthesizing zeolite molecular sieve by using natural mineral clay

A technology of natural minerals and synthetic zeolites, applied in molecular sieves and alkali exchange compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of crystal structure destruction, low overall utilization rate of clay minerals, and ineffective use of aluminum sources, etc. , to achieve the effect of low cost, rich source of raw materials, and easy separation

Pending Publication Date: 2021-08-17
ANHUI POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although high-temperature calcination, alkali fusion and acid / alkali leaching are used in the above method, SiO in clay can be effectively leached. 2 composition, however, leached SiO 2 During the process, the crystal structure of clay minerals is completely destroyed, only part of the silicon source is utilized, and the aluminum source is not effectively utilized. Therefore, the overall utilization rate of clay minerals is not high. In addition, high-temperature calcination, alkali fusion and acid / alkali leaching Processing generates a lot of waste liquid and energy consumption

Method used

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  • Method for directly synthesizing zeolite molecular sieve by using natural mineral clay
  • Method for directly synthesizing zeolite molecular sieve by using natural mineral clay
  • Method for directly synthesizing zeolite molecular sieve by using natural mineral clay

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Effect test

Embodiment 1

[0030] A kind of method utilizing natural mineral clay to directly synthesize zeolite molecular sieve, comprises the following steps:

[0031] Weigh 1g of attapulgite clay, 0.2g of sodium hydroxide, 0.1g of ammonium fluoride, 0.8g of tetraethylammonium bromide and 0.08g of seed crystals and grind to obtain a solid powder, and place the solid powder in a polytetrafluoroethylene lining , and then put a small container containing 5mL of ammonia water into a polytetrafluoroethylene liner, crystallize at 140°C for 48 hours, cool, filter, wash and dry, and XRD characterizes that the sample is a Beta zeolite molecular sieve.

Embodiment 2

[0033] A kind of method utilizing natural mineral clay to directly synthesize zeolite molecular sieve, comprises the following steps:

[0034] Weigh 1g of attapulgite clay, 0.35g of sodium hydroxide, 0.1g of ammonium fluoride, 0.8g of tetraethylammonium bromide and 0.08g of seed crystals and grind to obtain a solid powder, and place the solid powder in a polytetrafluoroethylene lining , and then put a small container containing 10mL of ammonia water into a polytetrafluoroethylene liner, crystallize at 140°C for 48 hours, cool, filter, wash and dry, and XRD shows that the sample is Beta zeolite molecular sieve.

Embodiment 3

[0036] A kind of method utilizing natural mineral clay to directly synthesize zeolite molecular sieve, comprises the following steps:

[0037] Weigh 1g of attapulgite clay, 0.30g of sodium hydroxide, 0.2g of ammonium fluoride, 0.8g of tetraethylammonium bromide and 0.08g of seed crystals and grind to obtain a solid powder, and place the solid powder in a polytetrafluoroethylene lining , and then put a small container containing 2mL of ammonia water into a polytetrafluoroethylene liner, crystallize at 140°C for 24 hours, cool, filter, wash and dry, and XRD shows that the sample is a Beta zeolite molecular sieve.

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Abstract

The invention provides a method for directly synthesizing a zeolite molecular sieve by using natural mineral clay. The method comprises the following steps: 1) mixing natural mineral clay, a hydroxide, a fluoride, an organic template agent and a structure-directing agent powder; (2) putting the mixed powder and an open container with ammonia water into a reaction kettle, and heating to react; and 3) after the reaction is finished, cooling, filtering, washing and drying to obtain the zeolite molecular sieve. Compared with the prior art, the natural mineral clay does not need to be subjected to acid leaching, alkali fusion or high-temperature roasting to leach the SiO2 component, so that the mineral clay used during crystallization keeps the original crystal structure, and the zeolite molecular sieve is really directly synthesized from the natural mineral clay. Moreover, the problems of overlarge pressure of a synthesis system, low efficiency of a single kettle, large discharge amount of waste liquid and the like caused by a hydrothermal synthesis method are also solved; cost is low, and environmental pollution is reduced.

Description

[0001] This application is a divisional application with an application date of May 04, 2017, an application number of 201710306617.X, and an invention title of "A Method for Directly Synthesizing Zeolite Molecular Sieves Using Natural Mineral Clay". technical field [0002] The invention relates to a method for synthesizing zeolite molecular sieves, more specifically to a method for directly synthesizing zeolite molecular sieves using natural mineral clay. Background technique [0003] Zeolite molecular sieves have special pores, large specific surface area, high hydrothermal stability and catalytic activity, and are widely used in petroleum refining and petrochemical processes such as hydrocracking, isomerization and alkylation. At present, the main production method of zeolite molecular sieve is the hydrothermal synthesis method, which has the disadvantages of low yield and high waste water discharge. [0004] The aluminum sources used in traditional hydrothermal synthesi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/48
CPCC01B39/48C01P2002/72C01P2004/03
Inventor 李兴扬王小雪蒯龙杨仁春任一鸣李芳张翠歌赵永慧徐峻青
Owner ANHUI POLYTECHNIC UNIV