粗製メタノールおよび副生高級アルコール類のガスクロマトグラフィーによる分析
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概要
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A crude methanol synthesized in plant from natural gas as a raw material contains a small amount of impurities of several kinds Confirmation of these by qualitative analysis can be made by means of usual chemical and physical methods but there are many difficulties for their quantitative determination. Qualitative and quantitative determinations are made simply by use of Fischer Scientific Company's partitioner gas chromatography.Impurities detected at the end of catalytic process by the gas chromatography are methyl ether, methyl formate, acetone and other C: O compounds, benzene, cyclohexane, methylcyclohexane and other aromatic compounds, higher alcohols having 2-7 carbon atoms, and normal paraffins having 5-9 carbon atoms.Compounds having higher boiling points than these require considerable time for analysis and they are left undetermined.Detailed analytical values of aromatic compounds and higher alcohols in the crude methanol are not given in this report as their amount are very small.Although the qualitative analysis by gas chromatography can be made by measuring the retention time but its reconfirmation is made by infrared absorption of a fraction from redistilled portion and by measuring the melting point of its urethan derivative.
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