Pyrolysis is a process that can produce different yields depending on various factors.
What is the Product Yield of Pyrolysis? (7 Key Insights)
1. Factors Affecting Pyrolysis Yield
The product yield of pyrolysis can vary based on temperature, process parameters, and the type of material being pyrolyzed.
2. Waste Tire Pyrolysis
For pyrolysis of waste tires, the total yield of gas products is typically 30-53% by weight, oil is 28-42%, and char is 14-28%.
3. Biomass Pyrolysis
For biomass pyrolysis, the major products are char, bio-oil, and pyrolytic gas. The yield for char, bio-oil, and gas can vary significantly under different process conditions, but typically the yields are around 50-70% for bio-oil, 13-25% for bio-char, and 12-15% for gas.
4. Plastic Pyrolysis
For plastic pyrolysis, the main products are fuel oil, carbon black, and syngas. The yield of these products can vary depending on the quality and type of the waste plastic, as well as the pyrolysis technology used. Generally, the pyrolysis of waste plastics can produce 30-80% oil, 20-30% carbon black, and 10-20% gas.
5. General Pyrolysis of Polymeric Materials
In general, pyrolysis of polymeric materials can result in the formation of three competing products: liquid products, coke residue (or char), and gas. The yield of these products depends on the process conditions and the properties of the raw materials.
6. Fast Pyrolysis
In fast pyrolysis, which is the most common method, the major product is bio-oil. The yields of the products are typically around 30-60% for liquid condensates, 15-35% for gases (including CO, H2, CH4, CO2, and light hydrocarbons), and 10-15% for char.
7. Ultra-Fast or Flash Pyrolysis
In ultra-fast or flash pyrolysis, which is an extremely rapid thermal decomposition process, the main products are gases and bio-oil. The yields of the products are approximately 10-20% for liquid condensate, 60-80% for gases, and 10-15% for char.
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