title: Application of (R)-3-hydroxyalkanoate methyl esters derived from microbial polyhydroxyalkanoates as novel biofuels.
abstract: Microbial polyhydroxyalkanoates (PHA) were proposed for the first time as a new type of biofuel. In this paper, poly-R-3-hydroxybutyrate (PHB) and medium chain length PHA (mcl PHA) were, respectively, esterified to become R-3-hydroxybutyrate methyl ester (3HBME) and medium chain length hydroxyalkanoate methyl ester (3HAME) via acid-catalyzed hydrolysis. The recovery percentages of 3HBME and 3HAME were 52 and 65%, respectively. The purities of 3HBME and 3HAME were 97 and 96%, respectively. Combustion heats of 3HBME, 3HAME, ethanol, n-propanol, n-butanol, 0(#) diesel, 90(#) gasoline, and 3HBME-based and 3HAME-based blended fuels were investigated and compared, respectively. It was found that 3HBME and 3HAME had combustion heats valuing 20 and 30 KJ/g, respectively. Ethanol has a combustion heat of 27 KJ/g, while addition of 10% 3HBME or 3HAME enhanced the combustion heat of ethanol to 30 and 35 KJ/g, respectively. The addition of 3HBME or 3HAME into n-propanol and n-butanol led to a slight reduction of their combustion heats. Combustion heats of blended fuels 3HBME/diesel or 3HBME/gasoline and of 3HAME/diesel or 3HAME/gasoline were lower than that of the pure diesel or gasoline. It was roughly estimated that the production cost of PHA-based biofuels should be around US$1200 per ton.
authors.affiliation: Multidisciplinary Research Center, Shantou University, Shantou, Guangdong 515063, China.
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Zhang
authors.forename: Rongcong
authors.initials: R
authors.lastname: Luo
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Deng
authors.forename: Guo-Qiang
authors.initials: GQ
authors.lastname: Chen
mesh_terms: D020001:1-Butanol / Q000494:pharmacology; D000433:1-Propanol / Q000494:pharmacology; D020155:3-Hydroxybutyric Acid / Q000737:chemistry*; D004736:Energy-Generating Resources; D004952:Esters / Q000737:chemistry*; D000431:Ethanol / Q000494:pharmacology; D005285:Fermentation; D005742:Gasoline; D006358:Hot Temperature; D054813:Polyhydroxyalkanoates / Q000737:chemistry*; D016958:Pseudomonas putida / Q000737:chemistry* / Q000254:growth & development
chemical_list: D004952:Esters; D005742:Gasoline; D054813:Polyhydroxyalkanoates; D000431:Ethanol; D020001:1-Butanol; D000433:1-Propanol; D020155:3-Hydroxybutyric Acid