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Eur. J. Mass Spectrom. DOI: 10.1255/ejms.619

Estimation of the molecular mass range of the tar from pyrolysis of casein by gas chromatography-mass spectrometry, probe mass spectrometry and size exclusion chromatography with 1-methyl-2-pyrrolidinone as eluent

B. Purevsuren, B. Avid and Ya. Davaajav
Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, Ulaanbaatar,51, Mongolia
A.A. Herod,* R. Kandiyoti and T.J. Morgan
Department of Chemical Engineering and Chemical Technology, South Kensington Campus, Imperial College London, London SW7 2AZ, UK

ABSTRACT:
Casein has been pyrolysed to obtained a biochar (28.3% yield) with mostly meso and macro pore structure and a liquid tar product of high yield-37.5%, with the balance as gas (20.9%) and water (13.3%). The elemental composition of the casein tar was: C-66.7%, H-8.3%, N-12.1%, O-12.9% (by difference). The tar sample has been characterised by mass spectrometry, GC-MS and heated probe ms, to give molecular mass distributions for comparison with molecular mass ranges indicated by analytical scale size exclusion chromatography (SEC). The tar appeared to be completely soluble in 1-methyl-2-pyrrolidinone (NMP), the solvent used for SEC. It appeared to consist mostly of lower molecular mass fractions with elution times at 18-26 min. GC-MS analysis showed the presence of both aliphatic and aromatic nitrogen-containing components. Neither GC-MS nor probe-ms were able to detect more than about half the tar components.

Keywords: casein, biochar, tar, pyrolysis

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