1. Overview.
Coal pitch is a by-product in the process of coal tar processing, which has high chemical and thermal stability, and is widely used in the preparation of activated carbon. Activated carbon is a widely used porous carbon material, which has the characteristics of high specific surface area, high adsorption performance and good mechanical strength. It is mainly used in water treatment, air purification, desulfurization and denitrification, catalyst carrier, solvent ** and other fields. In this article, we will introduce the process, impact advantages and application fields of coal pitch for activated carbon preparation.
2. The relationship between the properties of coal pitch and activated carbon.
Coal pitch is processed from coal tar and contains a large amount of hydrocarbons, mainly including carbon, hydrogen, oxygen, nitrogen and other elements. Its molecular structure is complex and contains a variety of functional groups, such as carboxyl groups, phenolic hydroxyl groups, ketone groups, etc. The presence of these functional groups makes coal pitch have good reactivity, adsorption properties, high calorific value and good cohesiveness.
In the process of activated carbon preparation, the chemical and physical properties of coal pitch have an important impact on its performance. For example, the phenolic substances in coal pitch can promote the surface oxidation of activated carbon and improve the adsorption performance of activated carbonThe hydrocarbons in coal pitch can adjust the pore structure of activated carbon and improve its adsorption performance.
3. Coal pitch is used in the preparation process of activated carbon.
1.Raw material preparation: high-quality coal tar is selected, and coal pitch is extracted through distillation, acid and alkali washing and other processes.
2.Pretreatment: Pretreatment such as filtration and drying of coal pitch to remove impurities and moisture.
3.Carbonization: The pretreated coal pitch is carbonized at high temperature to generate carbon materials.
4.Activation: The carbonized carbon material is activated to improve its specific surface area and adsorption performance.
5.* and treatment: the activated activated carbon is washed, dried and other processes to obtain valuable substances and the finished activated carbon is obtained at the same time.
Fourth, the advantages of coal pitch in the production of activated carbon.
The use of coal pitch as a raw material for activated carbon has the following advantages:
1.Low cost: Coal pitch is a relatively cheap raw material, and using it to make activated carbon can reduce production costs.
2.High carbon content: Coal pitch contains a high carbon content, which is conducive to improving the adsorption performance of activated carbon.
3.Good chemical stability: Coal pitch has good chemical stability, which makes the activated carbon made of it have good acid and alkali resistance and oxidation resistance.
4.Good cohesiveness: Coal pitch has good adhesion, which is conducive to the production of activated carbon with dense structure and high strength.
Fifth, the field of application.
Due to the advantages of high specific surface area and high adsorption performance, activated carbon is widely used in the following fields:
1.Water treatment: Activated carbon can be used to adsorb organic matter, heavy metal ions and other harmful substances in water to improve water quality.
2.Air purification: Activated carbon can be used to adsorb harmful gases such as formaldehyde and benzene in the air to purify indoor air.
3.Desulfurization and denitrification: Activated carbon can be used to adsorb harmful gases such as sulfur dioxide and nitrogen oxides in flue gas to achieve exhaust gas treatment.
4.Solvent**: Activated carbon can be used to adsorb organic matter in solvents for solvent ** and reuse.
5.Other fields: Activated carbon can also be used in catalyst carriers, capacitor electrode materials, and other fields.
In the future, with the continuous progress of science and technology and the expansion of application fields, the technology of coal pitch for the preparation of activated carbon will have a broader application prospect.