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Method for acidifying modified ultrastable molecular sieve

A molecular sieve and acid treatment technology, which is applied in molecular sieves and alkali exchange compounds, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., to achieve the effects of reducing production costs, simple and easy operation, and non-toxic and harmless raw materials

Inactive Publication Date: 2019-01-04
欧米伽新材料科技(南通)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the prior art, there are many studies on the acid modification of molecular sieves for the preparation of catalysts, but there are few reports on the preparation of hydrophobic high-silicon molecular sieve adsorbents by acid modification of ultra-stable molecular sieves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 50g of ultra-stable molecular sieve into a closed container, add 500ml of acetic acid with a concentration of 0.8mol / L, stir for 20 minutes, raise the temperature to 40°C, and treat with ultrasonic microwave for 20 minutes, wherein the microwave power is 100W, the ultrasonic power is 50W, vacuum filtration, and distilled water Wash until the filtrate is neutral, put the filter cake in a 100°C oven and dry for 4 hours to obtain the finished product;

[0023] The processed raw material is an ultra-stable molecular sieve with a unit cell constant of 2.46nm, a relative crystallinity of 87%, a skeleton silicon-aluminum ratio of 10.7, and a non-skeleton aluminum content of 18wt%;

[0024] After testing, the silicon-aluminum ratio of the finished product skeleton is still 10.7, and the non-skeleton aluminum content is 10.3wt%. It shows that the framework crystal of the sample is not destroyed, and 7.7 wt% of non-framework aluminum is extracted.

Embodiment 2

[0026] Put 40g of ultra-stable molecular sieves into a closed container, add 800ml of acetic acid with a concentration of 0.6mol / L, stir for 20 minutes, heat up to 60°C, and treat with ultrasonic microwave for 15 minutes, wherein the microwave power is 100W, the ultrasonic power is 50W, vacuum filtration, and Wash with distilled water until the filtrate is neutral, put the filter cake in an oven at 120°C and dry for 10 hours to obtain the finished product;

[0027] The raw material to be processed is an ultra-stable molecular sieve with a unit cell constant of 2.46nm and a relative crystallinity of 87%. Its skeleton silicon-aluminum ratio is 10.7, and the non-skeleton aluminum content is 18wt%;

[0028] After testing, the silicon-aluminum ratio of the finished product skeleton is still 10.7, and the non-skeleton aluminum content is 12.2wt%. It shows that the framework crystal of the sample is not destroyed, and 5.8 wt% of non-framework aluminum is extracted.

Embodiment 3

[0030] Put 30g of ultra-stable molecular sieve into a closed container, add 300ml of succinic acid with a concentration of 0.4mol / L, stir for 20 minutes, heat up to 50°C, and treat with ultrasonic and microwave for 20 minutes, wherein the microwave power is 100W, ultrasonic power is 50W, and vacuum filtration , washed with distilled water until the filtrate is neutral, and the filter cake was dried in an oven at 100°C for 8 hours to obtain the finished product;

[0031] The raw material to be processed is an ultra-stable molecular sieve with a unit cell constant of 2.46nm and a relative crystallinity of 87%. Its skeleton silicon-aluminum ratio is 10.7, and the non-skeleton aluminum content is 18wt%;

[0032] After testing, the silicon-aluminum ratio of the finished product skeleton is still 10.7, and the non-skeleton aluminum content is 8.6wt%. It shows that the framework crystal of the sample is not destroyed, and 9.4 wt% of non-framework aluminum is extracted.

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Abstract

The invention discloses a method for acidifying a modified ultrastable molecular sieve, one or a mixture of two of an acetic acid aqueous solution and a succinic acid aqueous solution is mainly addedas a modifier under the mild condition, the ultrasonic energy and the microwave energy are used to separate aluminum on the surface and a non-framework aluminum more easily without damaging a silica tetrahedron structure, the silica-alumina ratio of the molecular sieve is increased, and the hydrophilic performance is turned to the hydrophobic performance. The operation of the synthesis method is simple and easy to implement, the raw materials are poisonless and harmless, and the production cost is lowered.

Description

technical field [0001] The invention relates to the technical field of a new chemical method for modifying ultra-stable molecular sieves, in particular to a method for modifying ultra-stable molecular sieves by acid treatment. Background technique [0002] Volatile organic waste (VOCs) has become one of the most important air pollutants at present, and the adsorption method has the characteristics of energy saving and low operating cost, and is one of the effective methods for enriching and separating VOCs. Activated carbon occupies a dominant position due to its low price, large adsorption capacity, strong adsorption capacity, and strong applicability to various organic molecules. However, activated carbon is flammable, and there is a potential safety hazard of explosion when adsorbing ketones and aldehydes VOCs. Molecular sieves have the advantages of high temperature resistance, non-flammability, good thermal stability, strong selectivity, strong adsorption capacity, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
CPCC01B39/026
Inventor 张颖陈杰庞绍龙李瑞娜张胜华邱国锋刘敬印
Owner 欧米伽新材料科技(南通)有限公司