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US 8,574,404 B1Granted
Fast pyrolysis processor which produces low oxygen content, liquid bio-oil
OwnerDouglas Stewart Sinclairinventor
Life of this patent
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Abstract
In this fast pyrolysis processor the reaction conditions are tailored to minimize the production of gas, while using calcined limestone to provide the heat for fast pyrolysis of biomass and to lower the acidity and oxygen content of the liquid bio-oil which is produced.
Claims7
A method of producing low oxygen content pyrolysis liquid, while minimizing the production of gas, from the pyrolysis of biomass comprising:
- (a) calcining CaCO3 bearing granular material at a temperature greater than about 900° C.
- (b) cooling the calcined CaCO3 bearing granular material from greater than about 900° C. down to the desired pyrolysis temperature
- (c) rapidly mixing the calcined CaCO3 bearing granular material at the desired pyrolysis temperature with biomass feedstock so that:
- 1) heat from the calcined CaCO3 bearing granular material causes fast pyrolysis of the biomass feedstock
- 2) CaO in the calcined CaCO3 bearing granular material absorbs CO2 from the pyrolysis products
- (d) drawing the gaseous and suspended particulate pyrolysis products out of the pyrolysis chamber and separating them into a particulate portion composed primarily of char and a clean gas portion
- (e) cooling the clean gas portion, thereby condensing a liquid fraction and leaving a non-condensing gas fraction
- (f) removing the CaCO3 bearing granular material and pyrolysis ash from the pyrolysis chamber, separating them, and returning the CaCO3 bearing granular material to the calcining step.
5 more elements
Dependencies are inferred from the claim text.