The phosphoric acid method is to impregnate wood chips with phosphoric acid and produce activated carbon in a mechanical activation furnace. Compared with zinc chloride, the advantages of phosphoric acid method are:
1 High yield of activated carbon
2 The activation force is large, that is, the quality of activated carbon produced by the phosphoric acid method is relatively better than that of the zinc chloride method
3 It is easy to be refined without washing with hydrochloric acid
4 There is no need to use expensive gas recovery equipment. The hydrochloric acid gas volatilized by the zinc chloride method is harmful to humans and animals, so some funds must be invested to deal with these gases.
But the phosphoric acid method also has its own shortcomings;
1 Phosphoric acid is more expensive than zinc chloride;
2 Phosphoric acid is very corrosive at high temperatures, so the loss of equipment is quite serious. Increase the cost to a certain extent.https://www.powdered-activated-carbon.com/
In the process of activation, 3-4% of phosphoric acid will be evaporated, and 3-4% of phosphoric acid will be lost in the contact process of the equipment. At present, the problem of phosphoric acid production is that phosphoric acid is gradually separated from wood chips with the increase of temperature in the activation furnace and directly contacts with equipment materials to generate metal salts.
For example, using heat and acid corrosion resistant nickel-based composite metal as iron plate material can basically control the loss of phosphoric acid.T
The high cost of this material is not conducive to promotion. Therefore, solving the corrosion problem of phosphoric acid in the activation process and the recovery and reuse of phosphoric acid will be an important subject of the phosphoric acid process.https://www.granular-activated-carbon.com/
1 High yield of activated carbon
2 The activation force is large, that is, the quality of activated carbon produced by the phosphoric acid method is relatively better than that of the zinc chloride method
3 It is easy to be refined without washing with hydrochloric acid
4 There is no need to use expensive gas recovery equipment. The hydrochloric acid gas volatilized by the zinc chloride method is harmful to humans and animals, so some funds must be invested to deal with these gases.
But the phosphoric acid method also has its own shortcomings;
1 Phosphoric acid is more expensive than zinc chloride;
2 Phosphoric acid is very corrosive at high temperatures, so the loss of equipment is quite serious. Increase the cost to a certain extent.https://www.powdered-activated-carbon.com/
In the process of activation, 3-4% of phosphoric acid will be evaporated, and 3-4% of phosphoric acid will be lost in the contact process of the equipment. At present, the problem of phosphoric acid production is that phosphoric acid is gradually separated from wood chips with the increase of temperature in the activation furnace and directly contacts with equipment materials to generate metal salts.
For example, using heat and acid corrosion resistant nickel-based composite metal as iron plate material can basically control the loss of phosphoric acid.T
The high cost of this material is not conducive to promotion. Therefore, solving the corrosion problem of phosphoric acid in the activation process and the recovery and reuse of phosphoric acid will be an important subject of the phosphoric acid process.https://www.granular-activated-carbon.com/
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