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NaY molecular sieve modifying method

A molecular sieve and modification technology, which is applied in the direction of octahedral crystalline aluminum silicate zeolite and crystalline aluminosilicate zeolite, can solve the problems of destroying molecular sieve structure, increasing resin regeneration, and molecular sieve waste, so as to avoid environmental pollution and catalyze Effects of increased productivity and improved performance

Inactive Publication Date: 2014-08-27
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the resin blocks the sieve holes, and the viscosity of the molecular sieve makes the separation incomplete, which increases the regeneration of the resin and causes the waste of the molecular sieve
[0009] Ion exchange resin does not directly contact NaY molecular sieve. Although the content of sodium oxide can be reduced and the resin can be reused, excessive resin will greatly damage the molecular sieve structure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take NaY molecular sieve (15g), add water (150ml) and add rare earth solution LaCl 3 (1.0ml), add acetic acid-sodium acetate buffer solution (60ml) and stir for 30min, add organic mixed acid (both molar ratio of formic acid+hydrochloric acid 18:1):Na 2 O=2.2:1, control the rate of acid addition, heat up to 90°C, adjust PH=5.4, mechanically stir for 60min, filter with suction, rinse with 150ml of water, dry to obtain a crude sample, add 500ml of water and 8g of starch to the crude sample, Stir for 30 minutes, filter with suction, place in a muffle furnace for roasting, the roasting temperature is 600 degrees, and roast for 2 hours to detect the crystallinity of the sample 75% and Na 2 The content of O is 0.98%.

Embodiment 2

[0028] Take NaY molecular sieve (15g), add water (300ml) and add rare earth solution LaCl 3 (1.0ml), add acetic acid-sodium acetate buffer solution (120ml) and stir for 30min, add organic mixed acid (both molar ratio of acetic acid+hydrochloric acid is 18:1):Na 2 The molar ratio of O=2.2:1, control the drop rate of acid, be warming up to 90 ℃, adjust PH=5.4, mechanically stir 60min, suction filtration, rinse with 150ml water, dry, obtain crude sample, take crude sample and add 500ml water and 8g starch, stirred for 30min, suction filtered, placed in a muffle furnace for roasting, the roasting temperature was 600 degrees, roasted for 2 hours to detect the crystallinity of the sample 80% and Na 2 The content of O is 0.7%.

Embodiment 3

[0030] Take NaY molecular sieve (15g), add water (150ml) and add rare earth solution LaCl 3 (1.0ml), add acetic acid-sodium acetate buffer solution (60ml) and stir for 30min, add organic mixed acid (both molar ratio of trichloroacetic acid+hydrochloric acid 18:1):Na 2O=2.2:1, control the rate of acid addition, heat up to 90°C, adjust pH=5.4, mechanically stir for 60min, filter with suction, rinse with 150ml of water, dry to obtain a crude sample, add 500ml of water and 8g of starch to the crude sample, Stir for 30 minutes, filter with suction, place in a muffle furnace and roast at a temperature of 600 degrees, and roast for 2 hours to detect the crystallinity of the sample at 81% and Na 2 The content of O is 0.88%.

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PUM

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Abstract

A NaY molecular sieve modifying method includes: adding mixed acid into mixed liquid of NaY molecular sieve, buffer solution and water and beating uniformly, using the buffer solution to adjust pH to be 4.0-6.5, and performing exchange reaction at the temperature ranging from 70 DEG C to 95 DEG C; filtering the exchanged slurry to obtain a filter cake, washing the filter cake with deionized water, drying, adding starch, adding water, stirring, leaching and drying. Using the NaY molecular sieve modifying method can realize ammonia (ammonium)-free emission, and on one hand, the service life of equipment is prolonged, on the other hand, environment pollution can be reduced while the problem of waste water treatment of the ammonium salt method can be solved. Na2O content of a product obtained by the method can be reduced smaller than 0.5%, and crystallinity of the product can reach more than 85%.

Description

technical field [0001] The invention relates to a modification method for artificially synthesizing Y-type molecular sieves, in particular to a method for modifying NaY molecular sieves with organic mixed acids Background technique [0002] Molecular sieves are generally artificially synthesized zeolites, which are aluminosilicate compounds with cubic lattices. Neat, large internal surface area holes remnant metal ions and hydrated water with low charge and ionic radius. Molecular sieves have special selective catalytic properties due to their uniform composition, regular structure, adjustable surface acidity and molecular size pores. field dominates. [0003] Synthetic molecular sieves generally contain sodium, which exists in the form of non-skeleton cations to neutralize the negative charges on the molecular sieve skeleton, but sodium-type molecular sieves are not acidic, and need to be converted into hydrogen-type or polyvalent metal-type by ion exchange After molecul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
Inventor 向建南曹忠李议
Owner HUNAN UNIV
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