Waste tire pyrolysis is a process that converts old tires into valuable products.
These products include fuel oil, uncondensable gas (pyrolysis gas), carbon black, and steel wire.
The composition and yield of these products can vary depending on factors like the pyrolysis method, temperature, and the type of tire used.
What are the Products of Waste Tire Pyrolysis? (4 Key Byproducts Explained)
1. Fuel Oil
Fuel oil is the primary product of waste tire pyrolysis.
It is a mixture of hydrocarbons.
The yield of oil can range from 35% to 52% depending on the type of tire.
For example, large car tires, truck tires, and OTR tires yield about 45%-52% oil.
Smaller tires like those from motorcycles and bicycles yield about 35%-40% oil.
The oil obtained from pyrolysis can be used as a substitute for conventional fuels in various industrial applications.
2. Uncondensable Gas (Pyrolysis Gas)
This gas is produced during the pyrolysis process.
It typically contains about 40% methane.
The gas is used as a source of energy to power the pyrolysis reactor itself or other processes.
It is generated through the thermal decomposition of the rubber and other components in the tires.
The gas is separated from the oil through a condensation process.
3. Carbon Black
Approximately 380kg of carbon black is produced from the pyrolysis of scrap tires.
Carbon black is a valuable byproduct.
It can be used as a reinforcing agent in rubber products, as a pigment, and in various other industrial applications.
The production of carbon black from waste tires is an environmentally friendly alternative to traditional methods.
Traditional methods involve combustion of fossil fuels.
4. Steel Wire
About 170kg of steel wire is recovered from the pyrolysis of scrap tires.
This steel can be recycled and used in various industries.
It reduces the need for raw materials and contributes to the circular economy.
The recovery of steel also helps in reducing the overall weight of the waste material.
This makes it easier to handle and transport.
The pyrolysis process is influenced by several factors including the heating rate and temperature.
For example, maintaining a temperature around 450°C primarily yields liquid hydrocarbons.
Temperatures above 700°C favor the production of synthetic gas (syngas), a mixture of hydrogen and carbon monoxide.
The nature of the feedstock, such as whether the tires are whole or shredded, also affects the properties of the final products.
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