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Method for compounding all-silicon ZSM-5 molecular sieve by utilizing all-silicon Beta crystallized mother liquor

A technology of ZSM-5 and crystallization mother liquor, which is applied in the direction of borocarbane silicone crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problem of increasing the difficulty of sewage treatment, excessive suspended matter in effluent sewage, and increasing The cost of filter residue treatment and other issues can be shortened to shorten the synthesis time, improve the synthesis efficiency and shorten the crystallization cycle

Inactive Publication Date: 2018-12-07
JIANGSU TIANNUO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large amount of silicon in the mother liquor and the free silica is not easy to settle, it is very easy to cause the suspended solids in the sewage to exceed the standard, thereby increasing the difficulty of sewage treatment; and the Na in the crystallization mother liquor 2 O is high, increasing the cost of filter residue treatment

Method used

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  • Method for compounding all-silicon ZSM-5 molecular sieve by utilizing all-silicon Beta crystallized mother liquor
  • Method for compounding all-silicon ZSM-5 molecular sieve by utilizing all-silicon Beta crystallized mother liquor
  • Method for compounding all-silicon ZSM-5 molecular sieve by utilizing all-silicon Beta crystallized mother liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 3.7gNaOH is added to all-silicon Beta crystallization mother liquor 150g (SiO 2 : 65g / L; Na 2 O: 24.9g / L; template agent: 85g / L), stirred until a clear solution. Slowly add 240g of silica sol dropwise to the above mixed solution under magnetic stirring to form silicate gel A; transfer the silicate gel to a polytetrafluoroethylene-lined stainless steel crystallization kettle, crystallize at 120°C After 24 hours of melting, the product is separated to obtain the solid silicon ZSM-5 molecular sieve and the mother liquor. The solid silicon ZSM-5 molecular sieve is washed, dried at 85°C for 10 hours, and calcined at 550°C for 6 hours to obtain the original powder of all silicon ZSM-5 molecular sieve. ;

Embodiment 2

[0035]3.7gNaOH is added to all-silicon Beta crystallization mother liquor 150g (SiO 2 : 65g / L; Na 2 O: 24.9g / L; template agent: 85g / L), stirred until a clear solution. Slowly add 240g of silica sol dropwise to the above mixed solution under magnetic stirring to form silicate gel A; transfer the silicate gel to a polytetrafluoroethylene-lined stainless steel crystallization kettle, crystallize at 140°C After 20 hours of melting, the product is separated to obtain the all-silicon ZSM-5 molecular sieve solid and mother liquor, and the all-silicon ZSM-5 molecular sieve solid is washed, dried at 85°C for 10 hours, and roasted at 550°C for 6 hours to obtain the original powder of all-silicon ZSM-5 molecular sieve ;

Embodiment 3

[0039] 3.7gNaOH is added to all-silicon Beta crystallization mother liquor 150g (SiO 2 : 65g / L; Na 2 O: 24.9g / L; template agent: 85g / L), stirred until a clear solution. Slowly add 240g of silica sol dropwise to the above mixed solution under magnetic stirring to form silicate gel A; transfer the silicate gel into a polytetrafluoroethylene-lined stainless steel crystallization kettle, crystallize at 180°C 16 hours; the product is separated to obtain the all-silicon ZSM-5 molecular sieve solid and mother liquor, the all-silicon ZSM-5 molecular sieve solid is washed, dried at 85°C for 10 hours, and roasted at 550°C for 6 hours to obtain the original powder of all-silicon ZSM-5 molecular sieve ;

[0040] from figure 1 and figure 2 Compared with the results, it can be clearly seen that the particle size of the ZSM-5 molecular sieve in the unit volume of the reaction kettle obtained by the method of the present invention is obviously reduced, and the number of synthesis is rela...

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Abstract

The invention discloses a method for compounding an all-silicon ZSM-5 molecular sieve by utilizing all-silicon Beta crystallized mother liquor and belongs to the field of a synthetic method of the molecular sieve. The method comprises the following steps: analyzing and determining the mother liquor acquired by recycling all-silicon Beta, crystallizing and separating; taking the mother liquor as apart of raw materials for compounding the all-silicon ZSM-5 molecular sieve; correspondingly adding fresh raw materials according to the proportion, thereby compounding a sol mixture of the molecularsieve; compounding the all-silicon ZSM-5 molecular sieve by crystallizing. According to the method disclosed by the invention, unreacted components in the mother liquor for compounding the Beta molecular sieve are recycled, so that the discharging of compounding effluent can be avoided, the environmental pollution is reduced, the mother liquor is recycled and the raw materials are saved; particularly, no organic template agent is added, so that the compounding cost of the all-silicon ZSM-5 molecular sieve is greatly lowered; and meanwhile, the water content of feeding materials is lower, so that the compounding efficiency of unit volume of ZSM-5 molecular sieve of the reaction kettle can be increased.

Description

technical field [0001] The invention relates to the technical field of molecular sieve synthesis methods, in particular to a method for synthesizing all-silicon ZSM-5 molecular sieves by using all-silicon Beta crystallization mother liquor. Background technique [0002] Volatile organic compounds, referred to as VOCs (Volatile Organic Compounds), refer to organic compounds with a saturated vapor pressure greater than 70Pa at normal temperature and a boiling point within 260°C at normal pressure, such as many hydrocarbons, alcohols, aldehydes, ketones, ethers Classes, esters, etc. With the development of modern industry, the control and treatment of volatile organic compounds (VOCs) has become one of the research hotspots in the field of environmental protection. Adsorption method is an effective method to deal with VOCs, and the key to adsorption method is the selection of adsorption materials. At present, the two most widely used adsorbents in industry are activated carbon...

Claims

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Application Information

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IPC IPC(8): C01B39/40
CPCC01B39/40C01P2004/03
Inventor 孙先勇宋洁张伟柴志波曹金朋
Owner JIANGSU TIANNUO NEW MATERIAL TECH
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