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An interesting patent filed on Aug 18, 2008 is about “Integrated Process of Algae Cultivation and Production of Diesel Fuel from Biorenewable feedstocks“

According to the claims, the said integrated process comprises the following :

a) treating the renewable feedstock in a reaction zone by hydrogenating and deoxygenating the feedstock using at least one catalyst at reaction conditions in the presence of hydrogen to provide a reaction zone product stream comprising hydrogen, carbon dioxide, water and a paraffins having from about 8 to about 24 carbon atoms;

b) cooling the reaction zone product stream and separating to provide:
i) a gaseous component comprising at least hydrogen and carbon dioxide;
ii) a hydrocarbon product comprising the paraffins; and
iii) a water component;
c) recovering the hydrocarbon product;
d) separating the gaseous component comprising at least hydrogen and carbon dioxide into a stream comprising hydrogen and a stream comprising carbon dioxide; and
e) passing the stream comprising carbon dioxide to an algae cultivation operation and using the carbon dioxide stream to cultivate algae.

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