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Method for preparing P type zeolite

A technology of zeolite and mixture is applied in the field of zeolite to achieve the effects of high whiteness, simple process and high crystallinity

Inactive Publication Date: 2011-06-29
SHENZHEN OCEAN POWER INDUSTRIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of the existing method for preparing P-type zeolite, the present invention provides a method for preparing high-quality P-type zeolite using kaolin as raw material

Method used

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Examples

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preparation example Construction

[0023] The method for preparing P-type zeolite of the present invention, comprises the following steps:

[0024] (1) Grinding and processing washed kaolin to below 300 mesh;

[0025] (2) Mix the pulverized kaolin with sodium hydroxide solution, place it in a high-pressure reactor and seal it, heat it to 100-300°C, and activate it under self-pressure conditions for 1-48 hours to obtain active silicon oxide and aluminum oxide. lye, wherein the temperature for activation treatment is preferably 250-300°C, and the time is preferably 1-15 hours;

[0026] (3) A certain amount of sodium silicate or water glass or its combination is added in the alkali lye gained in step (2), and the mol ratio of regulating wherein each composition is: Al 2 o 3 : SiO 2 : NaO 2 :H 2 O=1:2.6~3.3:3.5~4.5:80~180;

[0027] (4) A certain mass of P-type zeolite is added as a seed crystal to the mixture obtained in step (3), and the mass of the P-type zeolite seed crystal is 0-20% of the mass of kaolin....

Embodiment 1

[0033] Using Maoming flake kaolin as raw material (SiO 2 2 o 3 ≥38%, Fe 2 o 3 2 2 O:Al 2 o 3 : SiO 2 :H 2 O=4.2: 1: 3.1: 94, to meet the conditions required for the preparation of P-type zeolite with high crystallinity and high whiteness; add 36 grams of P-type zeolite crystal seeds after stirring for 30 minutes, continue stirring for 30 minutes, and leave standstill Aging for 6 hours, then raising the temperature to 95°C, stirring and crystallizing for 4 hours, filtering, washing, and drying at 100°C for 2 hours to obtain the finished P-type zeolite. The product is detected by "X-ray diffraction analysis", and the crystallinity is 81%, and the whiteness is 93.

Embodiment 2

[0035] Kaolin is the same as example 1. Add 268 grams of kaolin to 1600 milliliters of sodium hydroxide solution with a concentration of 4 mol / L, place in a high-pressure reactor, stir at 200 ° C for 5 hours, then cool down to 60 ° C, add 212 grams of sodium silicate pentahydrate solid, The molar ratio of each material in the lye is adjusted to: Na 2 O:Al 2 o 3 : SiO 2 :H 2 O=4.2: 1: 3.1: 94, to meet the conditions required for the preparation of P-type zeolite with high crystallinity and high whiteness; add 36 grams of P-type zeolite crystal seeds after stirring for 30 minutes, continue stirring for 30 minutes, and leave standstill Aging for 6 hours, then raising the temperature to 95°C, stirring and crystallizing for 4 hours, filtering, washing, and drying at 100°C for 2 hours to obtain the finished P-type zeolite. The product is detected by "X-ray diffraction analysis", and the crystallinity of the sample is 88%, and the whiteness is 93%.

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Abstract

The invention belongs to the field of zeolite, and discloses a method for preparing P type zeolite. The method comprises the following steps: kaolin and a sodium hydroxide solution are mixed and then placed in a high pressure reactor to be activated, thereby acquiring a mixture containing activated silicon oxide and activated aluminum oxide; sodium silicate or water glass is added into the mixture to regulate the molar ratio of each composition in the mixture; the acquired mixture stands, ages and crystallizes; and a crystallized product is filtered, washed and dried, and then the P type zeolite is acquired. The method has the advantages of simple process, low energy consumption, short production cycle, high quality of the acquired product, low cost, and the like, and is easy to operate.

Description

technical field [0001] The invention relates to the field of zeolites, in particular to a method for preparing P-type zeolites. Background technique [0002] The unit cell composition of P-type zeolite is Na 8 + (H 2 O) 16 Al 8 Si 8 o 32 , the crystal structure of P-type zeolite is not single, it can be cubic system, such as P1 type, B1 type or P c Type, it can also be a tetragonal system, such as P2 or P t type. At present, the application research on P-type zeolite is mainly in the washing industry. As a detergent aid, P-type zeolite has better calcium-magnesium ion exchange performance than 4A-type zeolite, and its calcium-ion exchange capacity is equivalent to that of 4A zeolite. The capacity is twice that of 4A zeolite; the ion exchange speed is also faster, avoiding the rapid combination of active substances and metal ions during the washing process, making the detergency lasting; at the same time, it has a high adsorption capacity of non-ionic surfactants, an...

Claims

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Application Information

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IPC IPC(8): C01B39/52
Inventor 宋科何唯平
Owner SHENZHEN OCEAN POWER INDUSTRIAL CO LTD
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