Abstract
Gas chromatographic procedures are presented for the quantitative determination of three hydrocarbon fractions obtained from the pyrolysis of biphenyl. The low molecular weight hydrocarbons, hydrogen, and carbon monoxide were resolved on a column of silica gel in series with a molecular sieve (Linde 5A) column. The sensitivity, expressed in recorder scale divisions per l, of the peak height measurements for the various gases was found to be: hydrogen, 1.72; methane, 24.6; carbon monoxide, 28.4; ethane, 25.8; ethylene, 14.7; propane, 18.0; and propylene, 5.58. The benzene fraction was analyzed with a column of 30 wt% Apiezon L plus 2 wt% Carbowax 20M on Chromosorb P. The anaytical precision of the peak area determinations was 450 deg C in a 2% over the range of 35 to 170 g of benzene. Through the use of temperature programming, the polyphenyl compounds were determined utiiizing a stationary phase of 20 wt% LiCl on Chromosorb P. The peak area measurements of the terphenyl isomers were reproducible within 450 deg C in a 2%, in general, for 10 to 120 g of material. The precision of the quaterphenyl data was also 450 deg C in a 2% for 40 to 210 g of the isomers. (auth)
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