Method for extracting cedar oil and co-producing active carbon from China fir sawdust

Abstract

The invention discloses a method for extracting cedar oil and co-producing active carbon from China fir sawdust, which comprises the following steps of: distilling fresh China fir sawdust by using steam with the temperature between 100 and 120 DEG C for 3 to 4 hours, making the obtained steam enter a cooling process, and obtaining the cedar oil after oil-water separation; smoldering and carbonizing the China fir sawdust subjected to oil distillation, preheating the carbonized materials by using the steam; and after the temperature of the carbonized materials is between 80 and 100 DEG C, activating the carbonized materials in a flowing gas activation furnace at the temperature of between 800 and 1,000 DEG C for 15 to 20 seconds, and performing ball-milling on the coarse carbon which is obtained by activation so as to obtain physical active carbon. The energy used for distilling the China fir sawdust and preheating the carbonized materials and used by the flowing gas activation furnace is steam with the pressure of 3 to 4 KPa which is generated by waste heat in the production process of recovering the active carbon by using a waste heat boiler. The method can improve the yield and the quality, reduce the production cost, and improve the economic benefits.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for extracting fir oil from fir sawdust and co-producing activated carbon. Background technique [0002] The existing Chinese fir sawdust distillation method for extracting Chinese fir oil almost all adopts boilers or soil boilers to utilize coal and firewood as fuel to generate steam for distilling Chinese fir sawdust to obtain Chinese fir oil. Because the use of external heat not only wastes fuel, but also increases labor, which increases production costs; and the oil yield is low, usually less than 1%, resulting in waste of raw materials and reduced benefits. And the Chinese fir chips after oil steaming are often directly used as fuel, and the Chinese fir chips have not been fully utilized. [0003] On the other hand, woody physical activated carbon is produced by using fir wood chips as raw material by flowing gas activation method. Heat, the furnace temperature ca...

AI Technical Summary

Problems solved by technology

Excess heat is discharged into the air in the form of steam, which not only wastes energy, but also damages the environment, which does not meet the requirements of low-carbon development

At the same time, the carbonized material put into the carbonization furnace, due to the large amount of water in the carbonization process, is directly put into the activation furnace at room temperature to cause accumulation and insufficient combustion, which reduces the efficiency and unstable quality.

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