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Method for preparing NaY molecular sieve by taking polyaluminum chloride as aluminum source and recycling mother liquor

A technology of polyaluminum chloride and molecular sieve, applied in the direction of crystalline aluminosilicate zeolite, fajhedral crystalline aluminosilicate zeolite, etc., can solve the problems of high energy consumption, equipment blockage, etc. cost reduction effect

Pending Publication Date: 2021-08-20
3R ENVIRONMENTAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of freezing and crystallizing the waste liquid after evaporation and concentration consumes a lot of energy in industry, and it is easy to cause equipment blockage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing NaY molecular sieve and mother liquor reuse using polyaluminum chloride as an aluminum source, comprising the following steps:

[0027] Take the modulus as 3, SiO 2 Add 170g of water glass with a content of 29%, and add 169g of pure water at a temperature of 60°C under vigorous stirring, and then add polyaluminum chloride with a concentration of 10.8% (calculated as containing alumina) and a basicity of 90%. 65g, then add Na 2 O: Al 2 o 3 :H 2 O=2.48:1:43 low-alkali sodium metaaluminate 27g, finally add 38.8g of directing agent. The directing agent is composed of Na 2 O: Al 2 o 3 : SiO 2 :H 2 O=16:1:15:320, obtained by stirring at 35°C for 1 hour and aging for 6 hours. The total ratio of the mixture is Na 2 O: Al 2 o 3 : SiO 2 :H 2 O=4:1:9:200.

[0028]After the above mixed solution was fully stirred for 1 hour, it was put into an oil bath, and under the condition of 97° C., it was refluxed, crystallized for 24 hours, and then filt...

Embodiment 2

[0032] A method for preparing NaY molecular sieve and mother liquor reuse using polyaluminum chloride as an aluminum source, comprising the following steps:

[0033] Take the modulus as 3, SiO 2 170g of water glass with a content of 29%, under the condition of a temperature of 60°C and vigorous stirring, add 167g of pure water, add a concentration of 10.8% (according to the calculation of aluminum oxide), and a basicity of 75% of polyaluminum chloride 55.8 g, then add Na 2 O: Al 2 o 3 :H 2 O=2.48:1:43 low-alkali sodium metaaluminate 36.9g, finally add 38.7g of directing agent. The directing agent is composed of Na 2 O: Al 2 o 3 : SiO 2 :H 2 O=16:1:15:320, stirring at 35°C for 1 hour to form a gel. The total ratio of the mixture is Na 2 O: Al 2 o 3 : SiO 2 :H 2 O=4:1:9:200.

[0034] After the above mixed solution was fully stirred for 1 hour, it was put into an oil bath, and under the condition of 97° C., it was refluxed. After crystallization for 24 hours, it w...

Embodiment 3

[0038] A method for preparing NaY molecular sieve and mother liquor reuse using polyaluminum chloride as an aluminum source, comprising the following steps:

[0039] Take the modulus as 3, SiO 2 170g of water glass with a content of 29%, at a temperature of 60°C and vigorous stirring, add 164g of pure water, add a concentration of 10.8% (according to the calculation of aluminum oxide), and a basicity of 50% polyaluminum chloride 45.3 g, then add Na 2 O: Al 2 o 3 :H 2 O=2.48:1:43 low-alkali sodium metaaluminate 48.2g, and finally add 38.7g of directing agent. The directing agent is composed of Na 2 O: Al 2 o 3 : SiO 2 :H 2 O=16:1:15:320, stirring at 35°C for 1 hour to form a gel. The total ratio of the mixture is Na 2 O: Al 2 o 3 : SiO 2 :H 2 O=4:1:9:200.

[0040] After the above mixed solution was fully stirred for 1 hour, it was put into an oil bath, and under the condition of 97° C., it was refluxed. After crystallization for 24 hours, it was filtered and was...

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Abstract

The invention belongs to the technical field of inorganic synthesis, and relates to a method for preparing a NaY molecular sieve by taking polyaluminum chloride as an aluminum source and recycling mother liquor, which comprises the steps of S1, preparing a NaY molecular sieve crystallization guiding agent; S2, conducting gel forming, specifically, mixing sodium silicate, polyaluminum chloride, low-alkali sodium metaaluminate, a guiding agent and water according to the molar ratio of Na2O to Al2O3 to SiO2 to H2O being (2.2-8.5) to 1 to (7-16) to (100-380), and uniformly stirring at the temperature of 10-60 DEG C for 0.5-5 hours; S3, carrying out crystallization, specifically, crystallizing the mixture in a reaction kettle at the temperature of 80-120 DEG C for 6-48 hours, filtering, washing and drying to obtain a product NaY, and collecting filtered mother liquor. The method provided by the invention consumes less alkalinity, can reduce the consumption of low-alkali sodium metaaluminate and reduce the cost, and adopts polyaluminum chloride and low-alkali sodium metaaluminate to introduce an aluminum source, so that the concentration of sodium salt in the mother liquor can be reduced, and direct reuse of the mother liquor is facilitated.

Description

technical field [0001] The invention belongs to the technical field of inorganic synthesis, and relates to a method for synthesizing NaY molecular sieves and reusing mother liquor. Background technique [0002] In industry, the production of NaY molecular sieves basically adopts the directing agent method proposed in USP3,639,099 and USP4,166,099. The specific content is roughly as follows: firstly, prepare a molecular composition of about (15~17)Na 2 O: Al 2 o 3 : (14-16) SiO 2 : (280~360)H 2 The directing agent of O, and then the directing agent is mixed with water glass, low-alkali sodium metaaluminate, aluminum sulfate, etc. to prepare a molar composition of (3~6) Na 2 O: 1Al 2 o 3 : (8-12) SiO 2 : (120-200) H 2 0, and then the reaction mixture was crystallized at about 100°C. After the crystallization is completed, filter, and the filter residue is washed and dried to obtain NaY molecular sieve powder, and after the mother liquor is separated, it contains exc...

Claims

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Application Information

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IPC IPC(8): C01B39/24
CPCC01B39/24
Inventor 陈金发何文博周志农嘉玮
Owner 3R ENVIRONMENTAL TECH CO LTD
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