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Method for preparing zeolite 4A

A technology for zeolite and mixture, applied in the field of preparing 4A zeolite, can solve the problems of high cost and high energy consumption, and achieve the effects of improving yield, high whiteness and reducing energy consumption

Active Publication Date: 2011-06-29
何子豪 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the shortcomings of high energy consumption and high cost of the existing method for synthesizing 4A zeolite with kaolin, the present invention provides a method for preparing 4A zeolite with kaolin as raw material. The method has simple process, low energy consumption and low cost

Method used

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preparation example Construction

[0022] The method for preparing 4A zeolite of the present invention, comprises the following steps:

[0023] 1) Grinding and processing the washed kaolin to below 300 mesh;

[0024] 2) Mix the pulverized kaolin with a sodium hydroxide solution with a concentration of 2.5-6 mol / L, place it in a high-pressure reactor and seal it, and activate it under self-pressure and 100-300°C for 1-48 hours, preferably at 250 Activation treatment at ~300°C for 1 to 15 hours to obtain a lye containing activated silica and activated alumina, the molar ratio of each component in the lye is controlled within the following range: Al 2 o 3 : SiO 2 : NaO 2 :H 2 O=1:1.8~2.2:3~5:100~200;

[0025] 3) adding a certain amount of sodium hydroxide solution or water to the mixture obtained in step 2) for fine adjustment of the molar ratio of the components in the mixture;

[0026] 4) Standing and aging the mixture obtained in step 3) at 30-100° C. for 2-24 hours;

[0027] 5) crystallizing the aged mi...

Embodiment 1

[0031] Using Maoming flake kaolin as raw material (SiO 2 2 o 3 ≥36%, Fe 2 o 3 2 2 O:Al 2 o 3 : SiO 2 :H 2 O=3.5:1:2.1:140, to meet the conditions required for the preparation of NaA zeolite with high crystallinity and high whiteness; be heated up to 150°C, stirred for 5 hours, then cooled to 40°C and left to stand for 16 hours, Then heat up to 100°C, stir and crystallize for 6 hours, filter, wash with deionized water until pH<11, and then dry at 100°C for 2 hours to obtain the finished 4A zeolite. The 4A zeolite finished product is detected by "X-ray diffraction analysis", and the crystallinity is 85%, and the whiteness is 93%.

Embodiment 2

[0033] Kaolin raw material is with example 1. Adding 170g of kaolin to 1600 milliliters of concentration is in the sodium hydroxide solution of 3.0mol / L, is placed in the autoclave, the mol ratio of each material is adjusted to: Na 2 O:Al 2 o 3 : SiO 2 :H 2 O=3.8:1:2.1:140, to meet the conditions required for the preparation of NaA zeolite with high crystallinity and high whiteness; heat up to 200°C, stir for 3 hours, then cool down to 40°C and stand for 16 hours , and then heated up to 100°C, stirred and crystallized for 6 hours, filtered, washed with deionized water until pH<11, and then dried at 100°C for 2 hours to obtain the finished 4A zeolite. The product is detected by "X-ray diffraction analysis", and the crystallinity of the sample is 91%, and the whiteness is 93%.

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Abstract

The invention belongs to the zeolite field and discloses a method for preparing zeolite 4A by using kaolin as raw material. The method comprises the following steps: mixing kaolin and sodium hydroxide solution, placing the mixture in a reaction kettle to perform activation treatment and obtain the mixture containing active silica and active alumina, standing the obtained mixture for aging, crystallizing, filtering the crystallization product, washing and drying to obtain zeolite 4A. The method of the invention has the advantages that the process is simple, the energy consumption is low, the production cycle is short, the obtained product has high quality and low cost, etc.

Description

technical field [0001] The invention relates to the field of zeolite, in particular to a method for preparing 4A zeolite. Background technique [0002] 4A zeolite is the first synthetic zeolite material, its composition is Na 12 Al 12 Si 12 o 48 27H 2 O belongs to the cubic crystal system with a pore size of about 0.4nm. 4A zeolite has important applications in many fields: detergents with 4A zeolite as additives have the characteristics of no phosphorus, no chemical pollution, no residue, and strong decontamination ability, and have a very wide and important application in the washing industry; In the catalytic industry, 4A zeolite is widely used in petroleum cracking reactions; in the gas separation industry, 4A zeolite is used to prepare high-purity gas adsorbents. [0003] At present, there are two main sources of raw materials for synthesizing 4A zeolite: one is chemical raw materials, mainly sodium silicate and sodium aluminate solutions; the other is natural min...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/18
Inventor 宋科何唯平
Owner 何子豪
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