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Spherical activated carbon with high compressive strength and its preparation method and use

A technology of spherical activated carbon and compressive strength, applied in the field of adsorption materials, can solve the problems of high energy consumption, difficulty in achieving the sphericity of spherical activated carbon, cracking rate adsorption performance, and inability to achieve optimal synergy

Active Publication Date: 2020-10-30
SHENZHEN GLOBAL GREENLAND NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using the existing process to prepare spherical activated carbon, there are still many defects
For example, in the actual production, it is difficult to obtain a larger particle size spherical activated carbon while obtaining satisfactory pore size and strength characteristics in the actual production, and the practical application range is greatly limited.
Moreover, the existing technology is difficult to realize the synergy between parameters such as particle size, sphericity, cracking rate and adsorption performance of spherical activated carbon.
Further, the existing preparation method of spherical activated carbon has high energy consumption, which is not conducive to technological production
Similarly, for spherical activated carbon with smaller particle size, there is also a situation where the particle size and other parameters cannot be coordinated to achieve the optimum

Method used

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  • Spherical activated carbon with high compressive strength and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0093] The preparation of preparation example 1 spherical polymer matrix

[0094]Add 16 liters of water into a 50-liter polymerization kettle, heat to 50°C, add 8g of magnesium carbonate, 19g of gelatin and 0.13g of methylene blue under stirring, and add 2.7kg of methyl styrene, 0.9kg of The oil phase that dipentene and 18g benzoyl peroxide are mixed, add 1.0kg paraffin again, seal polymerization kettle, pass into clean compressed air in the polymerization kettle, keep the gas phase pressure in the kettle to be 0.02MPa. Then, stir quickly to adjust the liquid beads in the kettle to an appropriate particle size, raise the temperature to 80°C, keep warm for 10 hours, then raise the temperature to 110°C, keep warm for 18 hours, filter, wash, dry and sieve to obtain a white spherical polymer 1.95kg.

Embodiment 1

[0096] 1.1 Sulfonation

[0097] The spherical polymer (200g, median diameter is 0.5-3.0mm) that the mass ratio is 1:1 preparation example 1 obtains is mixed with concentrated sulfuric acid, then the mixture is added into the acid-resistant rotary tube furnace, under nitrogen atmosphere, with 5°C / min heating rate for the following heat treatment:

[0098] Heat to 200°C and stay for 60 minutes;

[0099] Carry out the following heat treatment at a heating rate of 4°C / min:

[0100] Heat to 300°C and stay for 120 minutes;

[0101] Heating to 310°C and staying for 120 minutes gave 224g of sulfonated product.

[0102] 1.2 carbonization

[0103] Under a mixed atmosphere of nitrogen and oxygen, the product obtained in step 1.1 sulfonated was subjected to the following heat treatment at a heating rate of 6°C / min:

[0104] Heat to 400°C and stay for 120 minutes;

[0105] Heat to 550°C and stay for 120 minutes;

[0106] It was then heated to 800°C and held for 100 minutes. The tem...

Embodiment 2

[0110] 2.1 Sulfonation

[0111] The spherical polymer (200g, median particle diameter is 0.5~3.0mm) that the mass ratio is 1:5 that preparation example 1 obtains is mixed with oleum, then the mixture is added into the acid-resistant rotary tube furnace, under nitrogen atmosphere, Carry out the following heat treatment at a heating rate of 4°C / min:

[0112] Heat to 210°C and stay for 120 minutes;

[0113] Carry out the following heat treatment at a heating rate of 5°C / min:

[0114] Heat to 280°C and stay for 120 minutes;

[0115] Heating to 300°C and staying for 240 minutes gave 218g of sulfonated product.

[0116] 2.2 Carbonization

[0117] Under a mixed atmosphere of nitrogen and oxygen, the product obtained in step 2.1 sulfonated was subjected to the following heat treatment at a heating rate of 5°C / min:

[0118] Heat to 400°C and stay for 120 minutes;

[0119] Heat to 550°C and stay for 120 minutes;

[0120] Then heat to 850°C and hold for 120 minutes. The temperatu...

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Abstract

The invention provides spherical active carbon with high compression strength and a preparation method and applications thereof. According to the preparation method, the temperature of the sulfonationphase is maintained in a range of 200 to 350 DEG C, spherical polymer with a median size (D50) of 0.10 to 2.5 mm is taken as the raw material, spherical active carbon with a small size and a median size (D50) of 0.05 to 2.0 mm can be prepared, the yield is good, the cost is low; and the prepared spherical active carbon has high compression strength, which can reach 85 to 300 N. Compared with conventional active carbon, the spherical degree of provided active carbon is higher, and the hollow structure is better. Moreover, in the sulfonation phase, the heating is carried out in a gradient temperature rising mode to greatly reduce the generation rate of semispherical balls, and the cracking rate is reduced. The provided active carbon has excellent physical or mechanical characteristics, prominently reduced cracking rate, and excellent adsorbing performance, and is capable of adsorbing harmful gas efficiently.

Description

technical field [0001] The invention belongs to the technical field of adsorption materials, in particular to a spherical activated carbon with high compressive strength, its preparation method and application. Background technique [0002] Activated carbon has broad non-specific adsorption properties and is therefore the most widely used adsorbent. Activated carbon is generally obtained by carbonization, followed by activation, of carbon-containing starting compounds, preferably such compounds which give economically reasonable yields. This is because the weight loss due to the departure of volatile components during carbonization and subsequent burnout during activation is significant. [0003] Due to different processes, activated carbon can be used in different forms, such as powdered carbon, flake carbon, granular carbon (Kornkohle), shaped carbon (Formkohle) and spherical activated carbon that have been used since the end of the 1970s. [0004] Spherical activated ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/318C01B32/336B01J20/20B01J20/28B01D53/02
CPCB01D53/02B01D2257/2064B01D2257/70B01J20/20B01J20/28004B01J20/28011B01J20/28019B01J20/28021C01B32/318C01B32/336
Inventor 常明珠
Owner SHENZHEN GLOBAL GREENLAND NEW MATERIALS CO LTD
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