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Application of C-type silica gel preparation method in ZSM-5 molecular sieve mother liquor treatment and C-type silica gel

A ZSM-5, molecular sieve technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems affecting the performance of ZSM-5 molecular sieves, and achieve the effect of avoiding environmental pollution

Active Publication Date: 2022-02-18
HEBEI XINPENG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicate Bulletin, Volume 34, Issue 10, Page 2775 also pointed out that Na in ZSM-5 molecular sieve mother liquor 2 O / SiO 2 The proportion of the molecular sieve has an important influence on the crystal phase, Na 2 O / SiO 2 If the ratio is too high, MOR heterocrystalline phase will be generated, which will affect the performance of ZSM-5 molecular sieve

Method used

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  • Application of C-type silica gel preparation method in ZSM-5 molecular sieve mother liquor treatment and C-type silica gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] This example provides an application of a C-type silica gel preparation method in the treatment of ZSM-5 molecular sieve mother liquor, which specifically includes the following steps:

[0045] (1) Collect and store 50kg of ZSM-5 molecular sieve mother liquor, its pH value is 11.0, and its Si content is 1.876wt%;

[0046] (2) Add the molecular sieve mother liquor described in (1) into the neutralization tank, stir for 30 minutes, and the stirring motor speed is 80r / min;

[0047] (3) Add 98% concentrated sulfuric acid to the neutralization tank described in step (2), and adjust the pH value to 6.0. At this time, the slurry becomes paste, which is a phenomenon of silica gel formation;

[0048] (4) Use a pneumatic diaphragm pump to drive the slurry into a plate-and-frame filter with a squeezing function for filtration, and then squeeze it with a squeezing pressure of 0.8Mpa;

[0049] (5) Unload the filter cake from the filter machine, then add water to make a slurry;

[...

Embodiment 2

[0056] This example provides an application of a C-type silica gel preparation method in the treatment of ZSM-5 molecular sieve mother liquor, which specifically includes the following steps:

[0057] (1) Collect and store 50kg of ZSM-5 molecular sieve mother liquor, its pH value is 10.8, and its Si content is 1.85wt%;

[0058] (2) Add the molecular sieve mother liquor described in (1) into the neutralization tank, stir for 30 minutes, and the stirring motor speed is 80r / min;

[0059] (3) Add 98% concentrated sulfuric acid to the neutralization tank described in step (2), and adjust the pH value to 7.2. At this time, the slurry becomes paste, which is a phenomenon of silica gel formation;

[0060] (4) Use a pneumatic diaphragm pump to drive the slurry into a plate-and-frame filter with a squeezing function for filtration, and then squeeze it with a squeezing pressure of 0.8Mpa;

[0061] (5) Unload the filter cake from the filter machine, then add water to make a slurry;

[0...

Embodiment 3

[0068] This example provides an application of a C-type silica gel preparation method in the treatment of ZSM-5 molecular sieve mother liquor, which specifically includes the following steps:

[0069] (1) Collect and store 50kg of ZSM-5 molecular sieve mother liquor, its pH value is 10.5, and its Si content is 1.82wt%;

[0070] (2) Add the molecular sieve mother liquor described in (1) into the neutralization tank, stir for 30 minutes, and the stirring motor speed is 80r / min;

[0071] (3) Add 98% concentrated sulfuric acid to the neutralization tank described in step (2), and adjust the pH value to 8.1. At this time, the slurry becomes paste, which is a phenomenon of silica gel formation;

[0072] (4) Use a pneumatic diaphragm pump to drive the slurry into a plate-and-frame filter with a squeezing function for filtration, and then squeeze it with a squeezing pressure of 0.8Mpa;

[0073] (5) Unload the filter cake from the filter machine, then add water to make a slurry;

[0...

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Abstract

The invention provides application of a C-type silica gel preparation method in ZSM-5 molecular sieve mother liquor treatment and C-type silica gel, and the application comprises the following steps: (1) stirring ZSM-5 molecular sieve mother liquor and adding acid to adjust the pH value to 6-9 to obtain slurry A; (2) filtering the slurry A, washing a filter cake, adding water, and pulping to obtain slurry B; and (3) carrying out flash evaporation drying on the slurry B to obtain the C-type silica gel. According to the method, effective components in the molecular sieve mother liquor are recycled, silica compounds such as silicate radicals in the molecular sieve mother liquor are recycled, and the influence of recycling of the molecular sieve mother liquor on the quality of the ZSM-5 molecular sieve is avoided.

Description

technical field [0001] The invention relates to the field of molecular sieve mother liquor recovery, in particular to the application of a C-type silica gel preparation method in ZSM-5 molecular sieve mother liquor treatment and the C-type silica gel. Background technique [0002] The synthesis of commonly used molecular sieves generally adopts non-equilibrium-based hydrothermal or solvothermal crystallization approaches, and the nucleation and crystal growth of molecular sieves are completed in a strong alkaline medium. The synthetic mother liquor is a strong alkaline waste liquid, which has the characteristics of large quantity, strong alkalinity and easy gelation. The synthetic molecular sieve mother liquor has become one of the pollution sources of the chemical industry. In the synthesis of molecular sieves, the silicon-aluminum ratio of materials in the formula plays an important role in the structure and composition of the final product. Generally, zeolites with low si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/143C01B33/148
CPCC01B33/143C01B33/148
Inventor 常瑞峰张春辉潘磊田英杰王刚曾庆义王金达牛月民
Owner HEBEI XINPENG CHEM CO LTD