Preparation method of hydrophobic Y-type molecular sieve and hydrophobic Y-type molecular sieve

A molecular sieve, hydrophobic technology, applied in separation methods, molecular sieves and alkali exchange compounds, chemical instruments and methods, etc., can solve the problems of restricting the popularization and use of activated carbon, unable to meet environmental protection emissions, difficult to regenerate activated carbon, etc., to prolong the adsorption breakthrough time. , the effect of shortening the modification time and reducing the economic cost

Active Publication Date: 2020-06-19
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, activated carbon is difficult to regenerate, has poor hydrophobicity, and is easy to burn, which limits the promotion and use of activated carbon, so the application of molecular sieves is relatively favored.
However, in the application process of molecular sieves, since most of the VOCs emitted by industrial sources contain a large amount of wa

Method used

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  • Preparation method of hydrophobic Y-type molecular sieve and hydrophobic Y-type molecular sieve
  • Preparation method of hydrophobic Y-type molecular sieve and hydrophobic Y-type molecular sieve
  • Preparation method of hydrophobic Y-type molecular sieve and hydrophobic Y-type molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] The present invention relates to a kind of preparation method of hydrophobic Y-type molecular sieve, comprises the following steps:

[0036] S1: Activation pretreatment process

[0037] Crush the NAY molecular sieve through the sieve, the mesh size of the sieve is 40-60 mesh, and roast it under the protection of an inert gas. The inert gas is preferably nitrogen. The roasting time is 1-4 hours, and the roasting temperature is 200-450 ° C. After roasting, it is placed in a desiccator Standby; in this step, the NAY molecular sieve can be any one of spherical, strip and powder, and of course a mixture of two or three of them can also be used.

[0038] S2: Modification process

[0039] Dissolve the NAY molecular sieve prepared in step S1 in an organic solvent, and add the silylating agent drop by drop while ultrasonically dispersing evenly. The ultrasonic time is 10 to 40 minutes, and then fully react in the reaction device with a condensing reflux device , specifically, ...

Example Embodiment

[0046] Embodiment one

[0047] In this embodiment, by changing a group of comparative experiments of components and reaction parameters, the optimal modification conditions of hydrophobic Y-type molecular sieves are selected, and the specific parameters are shown in Table 1:

[0048] Table 1:

[0049]

[0050] Refer to the components and proportions shown in Table 1, and prepare hydrophobic Y-type molecular sieves according to the above preparation method.

Example Embodiment

[0051] Embodiment two

[0052] This example involves the adsorption test of the hydrophobic Y-type molecular sieve prepared in Example 1 under a static saturated water vapor environment. Put the dish together in a closed incubator, let it stand for 24 hours, weigh the weight of the adsorbent, and calculate the water absorption by calculating the difference with that before adsorption.

[0053] The specific experimental parameters and results are shown in Table 2:

[0054] Table 2:

[0055]

[0056]The modification time, temperature, organic solvent, and silanization reagent were orthogonally screened according to four factors and three levels, and the optimal silanization reagent conditions were obtained as condensation reflux temperature 50°C, modification time 8h, organic solvent cyclohexane, silanization Reagent Dimethyldichlorosilane.

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Abstract

The invention provides a preparation method of a hydrophobic Y-type molecular sieve and the hydrophobic Y-type molecular sieve. The preparation method mainly comprises an activation pretreatment process, a modification process and a water washing process, and specifically comprises the following steps: crushing an NAY molecular sieve screen, roasting, adding an organic solvent, adding a silanization reagent while carrying out ultrasonic treatment, stirring to fully react, filtering, washing, drying and the like, thereby obtaining the hydrophobic Y-type molecular sieve. The preparation method of the hydrophobic Y-type molecular sieve is short in reaction time and high in efficiency, and the prepared hydrophobic Y-type molecular sieve is applied to adsorption treatment on industrial waste gas, can be repeatedly used for multiple times, and has relatively good cycle performance, long adsorption penetration time and a wide application range, so that the economic cost is reduced.

Description

technical field [0001] The invention relates to the technical field of modification of zeolite molecular sieve materials, in particular to a method for preparing a hydrophobic Y-type molecular sieve. At the same time, the invention also relates to the hydrophobic Y-type molecular sieve prepared by the preparation method. Background technique [0002] With the rapid economic development and the acceleration of the industrialization process, a large amount of industrial waste gas is discharged. Volatile organic compounds (VOCs) are a general term for a class of organic compounds. Organic compounds within ℃~260℃, including ketones, hydrocarbons, alcohols and lipids. Such compounds are very harmful to human health, and long-term exposure can cause lesions in the nervous system, liver and blood system, and even cancer. [0003] VOCs treatment technologies in the domestic and foreign markets are mainly terminal treatment technologies including adsorption technology, chemical abs...

Claims

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Application Information

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IPC IPC(8): C01B39/24B01J20/18B01J20/30B01D53/02B01D53/26
CPCC01B39/24C01B39/026B01J20/186B01D53/02B01D53/261B01D2257/708C01P2002/82
Inventor 王建英李智宁原峰张向京刘子欣刘欢刘彩红
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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