The tar was collected from biomass conversions as a by-product. How can we recycle it and utilize this material?
Dear Kunlin Song ,
Tar Can be converted into a number of usable compounds, by different methods.
To convert Biomass Tar into syn gas components check this link.
http://www.aidic.it/cet/14/37/035.pdf
Regards.
Beside as syn gas and carbon support, tar also can be used as coating agent in briquette production.
In the gasification and pyrolysis tars are considered byproducts waste and undesirable chemicals, but nowadays has been considered the need not only to separate them by cyclonic systems or absorption processes for the purpose of separating efficiently to develop a "Fine Chemistry" allowing use them for chemical fuels by hydrocracking processes and chemical separations of each suitable component for use in other processes.
Many products are present on the tar of pirólie and gasification. The syn gas is only one opportunity. More than 400 compounds can be found in the tar.
First, there is a solid-liquid tar (carbonous sludge) in the pyrolysis field and a solid or powdered carbonous char in the gasification rest, being the first carried out with purpose of oil fuel con-densed after heating up to the temp 500-600 C that is most proper for volatilizing (evaporating) the condensable vapors of the oil fuel, and being the tar produced on the first condensing stage at the temp 300-350 C.
In its turn the gasification is performed with purpose of gas fuel (syngas) output at the temp 900-1000 C at which the various incondensable gases are mostly producing, being the syngas not condensing but burning directly just after that. The pyrolysis tar can be used as a binder for as-phalt road, being used so just similar to the petroleum tar.
Hello Kunlin Song,
well tar is a very complex topic. My first question would be: do you want to have tar as an intermediate product or do you have problems to get rid of it?
If it is the first, that you look for tar as an intermediate product, you will do a rapid pyrolysis, wher you get al volatiles out of the process as fast as possible. If you keep tar in contact with hot carbon (eg. from the pyrolysis) it will degenerate to gas and less heavier tars. If yo keep it in gaseous phase at something about 400 - 500 °C it will recombinate to heavier tars and far above that temperature (over 800 °C) you will have an rapid increase in polycyclic aromatic compounds - well at least that won't be your aim. But anyway the condesable matter from pyrolysis are a mixture of many hundred components in cluding all types of tars: heavy, light, hydrophilic, hydrophobic, toxic, causing cancer and so on. Please, keep them inside the process.
If you just have the problem to get rid of it, make greater effords to get rid of the tar than to think how you could use it. One possibility is degradation with activated carbon, which you might get by allothermal gasification of the biomass itself.
My advice: produce tar on purpose, knowing what you are doing, or destroy it as far as possible, because it is highly dagerous.
Good luck!
Tar is a by product of the biomass gasification that is present in the producer gas. However, it is desired to be at low concentrations in the gas especially if downstream applications are required. Otherwise, tar as a by product is a complex mixture of different organic materials, light and heavy polyaromatics. Thus it has appreciable heating value that can be utilized. Furthermore, the target components could be separated.
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