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Operation & Maintenance of Power Plants 


and soy. In addition, the production of biodiesel, as practiced for many years, involves a catalytic process followed by complex removal of the dissolved catalyst and purification of the biodiesel. As well as algae oil, this new process, also converts inferior fats and paper- industry waste into high-quality diesel fuel. Sachtleben’s catalytically active particles play a


major role in the new approach for the significantly simpler production of biodiesel. Te particles are, on the one hand, sufficiently stable to withstand the extreme reaction conditions, and are, on the other hand, the factor which makes rapid and complete transesterification of the feedstocks possible at all. Up until now, the reaction time in the process took several hours, whereas the new process utilising Sachtleben particles takes just a few seconds. For its part, Dow is working with Algenol Biofuels to build and operate a pilot-scale algae-based integrated biorefinery that will convert carbon dioxide into ethanol. Te facility is planned to be located at Dow’s Freeport, Texas site. Algenol’s technology uses carbon dioxide, salt water, sunlight and non-arable land to produce ethanol. Dow, National Renewable Energy Laboratory (NREL), the Georgia Institute of Technology (Georgia Tech) and Membrane Technology & Research are contributing science, expertise, and technology to the project. Algenol has submitted its formal request to obtain


a grant from the US Department of Energy for financial support to successfully conduct the pilot. Upon approval of the grant, Dow and the other collaborators will work with Algenol to demonstrate the technology at a level to sufficiently prove that it can be implemented on a commercial scale.


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In addition to leasing the land for the pilot-scale


facility, Dow plans to develop the advanced materials and specialty films for the photobioreactor system. Dow will also provide the technology and expertise related to water treatment solutions and will provide Algenol with access to a carbon dioxide source for the biorefinery from a nearby manufacturing facility. Te carbon dioxide will be supplied to the algae in the photobioreactors and will serve as the carbon source for the ethanol produced. Te result is a carbon dioxide capture process which converts industrially- derived gas into more sustainable fuels and chemicals. Meanwhile other technologies are nearer to


commercial production. For example, UOP continues to build on its joint venture with Ensyn. Together they offer Ensyn’s proven Rapid Termal Processing (RTP) technology to convert second generation biomass like forest and agricultural residuals to pyrolysis oil for use in power and heating applications (Fig. 1). Te RTP process is a fast thermal process where biomass is rapidly heated in the absence of oxygen. Te biomass is vapourised and then rapidly cooled to generate high yields of pyrolysis oil. Te process uses a circulating transported fluidised bed reactor system similar to that used in the UOP fluid catalytic cracking technology. RTP typically yields 65–75wt per cent pyrolysis oil from dried woody biomass which can be used as fuel for industrial heat and electrical generation. Pyrolysis oil itself is clean burning with minimal sulphur and nitrogen content. Te pyrolysis oil produced using RTP is almost carbon neutral and is marketed by the jv as an ideal solution for customers wishing to reduce their carbon footprint (Fig. 2). l


Fig. 2. Pyrolysis oil is an ideal solution for customers wishing to reduce their carbon footprint.


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