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A brand new concept for refining biocrude


A new idea for refining biocrude
Credit: Bao et al, Frontiers of Chemical Science and Engineering (2022). DOI: 10.1007/s11705-021-2126-y

The excessive content material of nitrogen-containing natural compounds (NOCs) in biocrude obtained from hydrothermal liquefaction of microalgae is among the most regarding points on the functions and setting. The biocrude obtained by hydrothermal liquefaction (HTL) wants additional refining optimization, and the excessive focus of nitrogen-heterocyclic compounds similar to quinoline, pyridine, and so forth., will poison the catalyst used within the refining course of, in order that the deactivation of the catalyst will trigger nice difficulties in refining the biocrude. Moreover, NOCs and sulfides have a aggressive relationship within the desulfurization means of biocrude, which inhibits the desulfurization impact. Although there have been many research on tackling nitrogen-related issues and analyzing response mechanisms for some key reactions, there’s nonetheless no full and systematic investigation on the general nitrogen pathway throughout HTL course of.

Yuanyuan Shao, an related professor from the School of Chemical Engineering and Technology at Tianjin University, and colleagues proposed to research the nitrogen distribution in numerous merchandise and analyze the consequences of response situations on nitrogen distribution to discover its response pathway. Their research was printed on-line in Frontiers of Chemical Science and Engineering on March 7, 2022.

“In this project, we used Chlorella sp. and Spirulina sp. as feedstock. The effects of reaction temperature, residence time and solid loading rate on the yield, nitrogen recovery and chemical compositions of biocrude were comprehensively investigated,” mentioned Prof. Shao. “We also analyzed the nitrogen distribution in the aqueous phase, and a brief reaction map during the whole process was the highlight of this research.”

“We found that there were three main forms of NOCs, including nitrogen-heterocyclic compounds, amides, and amines. And there was a certain transformation relationship between them; the proportion of distribution in different products mainly depends on the reaction conditions,” mentioned Tianyi Bao, the primary writer of the paper, a Ph.D. scholar from the School of Chemical Engineering and Technology at Tianjin University. “Even though the chemical compositions of the two microalgae which both belonged to high-protein low-lipid microalgae were similar, the contents and distribution of nitrogen in biocrude and aqueous phase were quite different.”

Actually, the consultant of amino acids in Chlorella sp. and Spirulina sp. protein are leucine and arginine, respectively. In phrases of chemical construction, leucine is a impartial amino acid whereas arginine is a fundamental amino acid. “We inferred that more nitrogen in basic amino acids was inclined to go into the aqueous phase and existed in the forms of water-soluble NOCs,” mentioned Tianyi Bao. This consequence demonstrates that the number of microalgae, particularly the evaluation of the inner protein construction, can be one of many focuses of future analysis.


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More data:
Tianyi Bao et al, Nitrogen distribution within the merchandise from the hydrothermal liquefaction of Chlorella sp. and Spirulina sp., Frontiers of Chemical Science and Engineering (2022). DOI: 10.1007/s11705-021-2126-y

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A brand new concept for refining biocrude (2022, May 19)
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