In this present paper, a new physical parameter (named as thermo‐kinetic parameter) of reactants was defined according to Zhu's kinetic equation, which can be used to quantitatively estimate activation free energy of various chemical reactions. In order to test the actual application of the thermo‐kinetic parameter of reactants, the thermo‐kinetic parameter values of 109 hydrogen atom donors and 109 hydrogen atom acceptors in acetonitrile at 298 K were determined using experimental methods and the rate constants of 5886 hydrogen atom transfer reactions in acetonitrile at 298 K were quantitatively estimated only using the thermo‐kinetic parameter values of the 109 hydrogen atom donors and the 109 hydrogen atom acceptors in acetonitrile at 298 K. The reliabilities of the estimations were verified. Physical meanings and affecting factors of the thermo‐kinetic parameter were elucidated and examined, respectively. The most significant contribution of this paper is to realize the chemists’ dream for a century that the reaction rate constants can be quantitatively estimated using only one physical parameter for each reactant.

Hydrothermal liquefaction of algae biomass is a promising technology for the production of sustainable biofuels, but the non-oil, aqueous co-product of the process has only been examined to a limited extent. The aqueous phase from liquefaction of the alga Nannochloropsis oculata (AqAl) was used to make growth media for model heterotrophic microorganisms Escherichia coli, Pseudomonas putida, and Saccharomyces cerevisiae. Growth rates, yields, and carbon/nitrogen/phosphorus uptake were measured. E. coli and P. putida could grow using AqAl as the sole C, N, and P source in media containing 10 vol.%-40 vol.% AqAl with the best growth occurring at 20 vol.%. S. cerevisiae could grow under these conditions only if the media were supplemented with glucose. The results indicate that in a biorefinery utilizing algae liquefaction, the aqueous co-product may be recycled via microbial cultures with significantly less dilution than previously published methods.

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