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Method for synthesizing P zeolite molecular sieve from rice husk

A technology of zeolite molecular sieve and rice husk, which is applied in the direction of crystalline aluminosilicate zeolite, etc., to achieve the effects of high whiteness, easy availability of materials, and reduced production costs

Inactive Publication Date: 2017-02-08
曹蕊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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 molecular sieve using rice husk as raw material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of method that embodiment 1 provides is that raw material synthetic P-type zeolite molecular sieve with rice husk, comprises the steps:

[0032] Rinse the rice husk, dry after removing impurities, and cook the rice husk with 10% sulfuric acid solution (the weight ratio of rice husk and 10% sulfuric acid solution is 1:2) for 1 hour; wash the rice husk after co-cooking with distilled water for 3 After drying, put it in a muffle furnace and keep it warm at 400°C for 5 hours to obtain rice husk ash; mix rice husk ash, sodium hydroxide and water, place it in a high-pressure reactor and seal it, heat it to 180°C and activate it at 0.5MPa Treat for 4 hours, add sodium aluminate and water, adjust the molar ratio of each material in the lye to: Al 2 o 3 : SiO 2 : Na 2 O: H 2 O=1:2.6:3.5:85, add P-type zeolite seeds, stand and age at 60°C for 6 hours, then raise the temperature to 90°C, stir and crystallize for 6 hours, filter, wash, and then dry at 100°C After 2 hour...

Embodiment 2

[0034] A kind of method that embodiment 2 provides is that raw material synthetic P-type zeolite molecular sieve with rice husk, comprises the steps:

[0035] Rinse the rice husk, dry after removing impurities, and cook the rice husk with 15% sulfuric acid solution (the weight ratio of rice husk and 15% sulfuric acid solution is 1:2) for 2 hours; wash the rice husk after co-cooking with distilled water for 5 After drying, put it in a muffle furnace and keep it warm at 800°C for 1 hour to obtain rice husk ash; mix rice husk ash, sodium hydroxide and water, place it in a high-pressure reactor and seal it, heat it to 230°C and activate it at 0.5MPa Treat for 4 hours, add aluminum sulfate and water, adjust the molar ratio of each material in the lye to: Al 2 o 3 : SiO 2 : Na 2 O: H 2 O=1:3.3:4.5:180, add P-type zeolite seeds, stand and age at 80°C for 2 hours, then raise the temperature to 100°C, stir and crystallize for 3 hours, filter, wash, and then dry at 100°C After 2 ho...

Embodiment 3

[0037] A kind of method for the synthetic P-type zeolite molecular sieve of raw material with rice husk that embodiment 3 provides, comprises the steps:

[0038] Rinse the rice husks, dry them after removing impurities, and co-cook the rice husks with 12% sulfuric acid solution (the weight ratio of rice husks to 12% sulfuric acid solution is 1:2) for 1.5 hours; wash the rice husks after co-cooking with distilled water 4 times, after drying, put it in a muffle furnace and keep it warm at 650°C for 4 hours to obtain rice husk ash; mix rice husk ash, sodium hydroxide and water, put it in a high-pressure reactor and seal it, heat it to 210°C at 1.2MPa Activation treatment for 4 hours, adding aluminum nitrate and water, adjusting the molar ratio of each material in the lye to: Al 2 o 3 : SiO 2 : Na 2 O: H 2 O=1:2.8:4.1:120, add P-type zeolite seeds, stand and age at 80°C for 8 hours, then raise the temperature to 95°C, stir and crystallize for 4 hours, filter, wash, and then dr...

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Abstract

The invention discloses a method for synthesizing a P zeolite molecular sieve from rice husk. The method includes: subjecting crushed rice husk to pretreatment with sulfuric acid, conducting washing and drying, then putting the dried rice husk into a muffle furnace for pyrolysis, collecting combusted rice husk ash, putting the combusted rice husk ash and a sodium hydroxide aqueous solution in a high pressure kettle to conduct hydrothermal activation for 2-4h under a temperature of 180-230DEG C, and performing cooling to obtain an activated alkali solution, adding an aluminum source into the activated alkali solution, then adding a P zeolite molecular sieve crystal, and carrying out aging, heating crystallization, filtering, washing and drying, thus obtaining a finished product. The method realizes waste recycling, and has the advantages of simple process, short production period, easy operation, and the obtained product has the characteristics of high quality and low cost, etc.

Description

technical field [0001] The invention relates to the synthesis technology of ultrafine chemicals, in particular to a process for synthesizing P-type zeolite molecular sieves with rice husks as raw materials. 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; a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
CPCC01B39/02
Inventor 曹蕊
Owner 曹蕊
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