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Filtration method of nanometer molecular screen

A nano-molecular sieve and filtration method technology, which is applied in the field of nano-molecular sieve filtration, can solve the problems of easy flocculation, clogged pores, and affecting the life of molecular sieves, and achieve the effects of avoiding flocculation, promoting flocculation, and accelerating the filtration rate

Inactive Publication Date: 2004-11-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the crystallization synthesis process of nano-molecular sieves, some uncrystallized SiO 2 Remaining in the mother liquor, at pH2 It is easy to flocculate and deposit inside the molecular sieve, blocking the orifice, thus affecting the life of the molecular sieve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix 170 ml of the above-mentioned nano-beta molecular sieve slurry (50 g on a dry basis) with 7 ml of 45% NaOH solution, stir evenly, and the slurry is viscous; add a mixture of 220 ml of ethanol and 70 ml of water, and stir evenly until the slurry flocculates. The pH was 12-13 and the solid product was isolated by filtration. Filtration was completed within 6 min, and the filtrate was clarified. Determination of SiO in filtrate and filter cake respectively 2 and SiO 2 / Al 2 o 3 . To evaluate the catalytic performance. Record it as A1. Properties are listed in Table 1.

Embodiment 2

[0032] Mix 170 ml of the above-mentioned nano-beta molecular sieve slurry (50 g on a dry basis) with 7 ml of 45% NaOH solution, stir evenly, and the slurry is viscous; then add a mixture of 600 ml of ethanol and 120 ml of water, and stir until the slurry is flocculated to maintain a pH of 12 -13, the filtration is completed within 30 minutes, the water content of the filter cake is large, and the filtrate is clear. Determination of SiO in filtrate and filter cake respectively 2 and SiO 2 / Al 2 o 3 . To evaluate the catalytic performance. Record it as A2. Properties are listed in Table 1.

Embodiment 3

[0034] Mix 170 ml of the above-mentioned nano-beta molecular sieve slurry (50 g on a dry basis) with 7 ml of 45% NaOH solution, stir evenly, and the slurry becomes viscous; add 220 ml of ethanol, and stir evenly until the slurry flocculates. The pH was 12-13 and the solid product was isolated by filtration. Filtration was completed within 6 min, and the filtrate was clarified. Determination of SiO in filtrate and filter cake respectively 2 and SiO 2 / Al 2 o 3 . To evaluate the catalytic performance. Record it as A3. Properties are listed in Table 1.

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Abstract

The filtering method for nano molecular sieve features that the method includes adding alkali medium, non-electrolyte and water into molecular sieve slurry. The added amount of the alkali medium is such that the mixture has pH not lower than 12; and the volume ratio among molecular sieve slurry, non-electrolyte and water is 1 to 1-5 to 0-2. The said method can inhibit flocculation of un-crystallized SiO2 effectively.

Description

technical field [0001] The invention relates to a method for filtering molecular sieves, and more particularly relates to a method for filtering nanometer molecular sieves. Background technique [0002] Nano-molecular sieves refer to molecular sieves with particle sizes ranging from 1 to 100 nm. The ratio of the number of atoms on the surface to the total number of atoms in the bulk increases sharply as the particle size decreases, making nano-molecular sieves a new material with unique catalytic properties. . The characteristics of nano-molecular sieves are as follows: 1) It has a larger outer surface area, which exposes more active centers, effectively eliminates the diffusion effect, and fully exerts the catalyst efficiency; 2) Has more pores exposed to the outside , It is not easy to be blocked by reaction deposits, which is beneficial to prolong the reaction operation period. [0003] However, the particle size of nano-molecular sieve is too small, so it is difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D24/00B01D39/06B01J29/00
Inventor 王永睿舒兴田宗保宁闵恩泽
Owner CHINA PETROLEUM & CHEM CORP
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