Despite the variety of research that has been conducted on the
use of pyrolysis technology for waste oil treatments and recovery,
this technology is still a relatively new process compared to other
existing technologies, and there are limited informations available
on the pyrolysis of waste oil such as the optimal reaction parameters
and the suitable design of pyrolysis system. Thus, the
growth of industrial pyrolysis applications is hampered by an
apparent lack of the understanding of the pyrolysis systems and
the technical information for designing commercial equipment for
the pyrolysis of waste oil. Consequently, the use of pyrolysis
technology for waste oil recovery has not been extensively
exploited despite the many advantages shown by pyrolysis. It was
revealed that some important characteristics of the pyrolysis
process have yet to be fully investigated such as the optimization
of key process parameters on the yield and chemical composition
of the product and the effects of the use of catalyst. Thus, more
studies are needed to obtain these information in order to develop
the technology to be both technical and economic feasibility for
energy recovery from waste oil.
So far, there has been little research reported on the pyrolysis of
waste oil, and existing literature is limited to mostly studies performed
nearly one decade ago on conventional electric-heated
pyrolysis of waste oil. It was established that current pyrolysis
techniques offer a number of advantages and show excellent
potential for treating the waste oil. However, it was found that
such practice possesses limitations and uncertainties and there are
still gaps to be filled in order to fully exploit the advantages of
using pyrolysis process to treat the waste oil.
On the other hand, the economics of pyrolysis of waste oil is
greatly dependent on the quality and yield of the pyrolysis products.
It was revealed that a very wide spectrum of pyrolysis
products ranging from methane to aromatic compounds can be
expected the pyrolysis of waste oil. Nevertheless, the characterization
of the products obtained during pyrolysis of different types
of waste oil is still an important aspect to study; as has been stated
in previous sections, several authors claim to have obtained different
product yields and spectra in different waste oil pyrolysis
750 S.S. Lam et al. / Renewable and Sustainable Energy Reviews 53 (2016) 741–753
processes. Thus, it is expected that the product spectra obtained in
pyrolysis of different types of waste oil could be different to those
found in previous pyrolysis studies of waste oil due to the different
natures of the waste oils being treated.
In summary, this review has revealed several aspects of pyrolysis
of waste oil that need to be examined to investigate whether
pyrolysis technique is optimized for conversion of waste oil into
products for use as an energy source. In view of the ability of
pyrolysis techniques to treat and transform waste oils into
potentially useful hydrocarbon products, it would be worthwhile
to carry on researching further aspects of pyrolysis of waste oils in
order to explore the full potential of this process. The optimization
of this process and the subsequent scale-up to a commercial scale
will depend on how well the parameters involved in this new
process and their relationship are understood.
Despite the variety of research that has been conducted on theuse of pyrolysis technology for waste oil treatments and recovery,this technology is still a relatively new process compared to otherexisting technologies, and there are limited informations availableon the pyrolysis of waste oil such as the optimal reaction parametersand the suitable design of pyrolysis system. Thus, thegrowth of industrial pyrolysis applications is hampered by anapparent lack of the understanding of the pyrolysis systems andthe technical information for designing commercial equipment forthe pyrolysis of waste oil. Consequently, the use of pyrolysistechnology for waste oil recovery has not been extensivelyexploited despite the many advantages shown by pyrolysis. It wasrevealed that some important characteristics of the pyrolysisprocess have yet to be fully investigated such as the optimizationof key process parameters on the yield and chemical compositionof the product and the effects of the use of catalyst. Thus, morestudies are needed to obtain these information in order to developthe technology to be both technical and economic feasibility forenergy recovery from waste oil.So far, there has been little research reported on the pyrolysis ofwaste oil, and existing literature is limited to mostly studies performednearly one decade ago on conventional electric-heatedpyrolysis of waste oil. It was established that current pyrolysistechniques offer a number of advantages and show excellent
potential for treating the waste oil. However, it was found that
such practice possesses limitations and uncertainties and there are
still gaps to be filled in order to fully exploit the advantages of
using pyrolysis process to treat the waste oil.
On the other hand, the economics of pyrolysis of waste oil is
greatly dependent on the quality and yield of the pyrolysis products.
It was revealed that a very wide spectrum of pyrolysis
products ranging from methane to aromatic compounds can be
expected the pyrolysis of waste oil. Nevertheless, the characterization
of the products obtained during pyrolysis of different types
of waste oil is still an important aspect to study; as has been stated
in previous sections, several authors claim to have obtained different
product yields and spectra in different waste oil pyrolysis
750 S.S. Lam et al. / Renewable and Sustainable Energy Reviews 53 (2016) 741–753
processes. Thus, it is expected that the product spectra obtained in
pyrolysis of different types of waste oil could be different to those
found in previous pyrolysis studies of waste oil due to the different
natures of the waste oils being treated.
In summary, this review has revealed several aspects of pyrolysis
of waste oil that need to be examined to investigate whether
pyrolysis technique is optimized for conversion of waste oil into
products for use as an energy source. In view of the ability of
pyrolysis techniques to treat and transform waste oils into
potentially useful hydrocarbon products, it would be worthwhile
to carry on researching further aspects of pyrolysis of waste oils in
order to explore the full potential of this process. The optimization
of this process and the subsequent scale-up to a commercial scale
will depend on how well the parameters involved in this new
process and their relationship are understood.
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