Activated carbon and petroleum

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Asked at 2021-04-13 20:17:47

When the temperature is below 600℃, the specific surface area of carbonized material increases with the increase of temperature.When 600~900℃, the specific surface area reaches a certain value: 250~300 m2/g; when above1000℃, the specific surface area shrinks rapidly.corundum suppliers 

When the carbonization temperature is above 800℃, the reaction performance of carbonized compounds and activation gas gradually becomes weaker, so the carbonization temperature is generally below 1000℃. However, if the residual volatile content and thermal effect are taken into account, the most suitable temperature should be 600~700℃39].hslabrasive 

The carbonized substance obtained from the carbonization process is placed in water vapor or a mixture of water vapor and combustion gas and heat treated at 800~1000℃, which is called the activation process.

The commonly used activation gases are carbon dioxide, water vapor, oxygen, etc., due to the oxidation reaction of these gases on the surface of the carbonized substance, eroding the carbonized substance, thus producing a rich porous structure.(2) Chemical method. When the activated carbon is treated by ultrasonic wave, the ultrasonic cavitation will cause shock wave and microjet, and the different ultrasonic treatment time and physical parameters will have different effects on the properties of activated carbon.

Yu Fengwen et al. 1 found that the pore size of activated carbon was changed by ultrasonic modification, and the BET specific surface area and micropore specific surface area of activated carbon decreased slightly with the extension of ultrasonic treatment time.

In order to make the activated carbon material have more abundant void structure and more uniform pore size distribution, some activators are often added in the activation process.

The commonly used activators are alkali metals, hydroxides of alkali earth metals, inorganic salts and some acids. At present, the more widely used and more mature chemical activators are KOH, NaOH, ZnCH, CaCb and H.PO, etc."Different activators and their dosages make the preparation of activated carbon more flexible, among which the super activated carbon prepared by KOH as the activator has the best performance. 

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