Granulated silica gel treated with hydroxylamine sulfate and thymol blue is used as a detecting agent for acetaldehyde in ethylene oxide vapor which gives orange yellow to intense red coloration when a definite amount of this-agent is filled in a small glass tube and 100 cc (30 cc) ethylene oxide vapor is passed through in 200 seconds (60 seconds) for quantitative determination of acetaldehyde in ethylene oxide vapor from the length of discolored column of the agent. Correction of an internal diameter of the detector tube, the relation between a length of discolored column and a concentration of acetaldehyde in ethylene oxide vapor, the effect of temperature of detector tube, etc.have been investigated. It was found that a simple quantitative determination of 0.003-0.3%(0.01-4.5%) acetaldehyde in ethylene oxide vapor was possible.
Various organic compounds containing oxygen were reduced by catalytic hydrogenation with molybdenum sulfide catalyst at high pressure.Alcohols, ethers, aldehydes, ketones, carboxylic acids, and esters formed corresponding hydrocarbons with high yield and no cleavage between carbon-carbon bonding was observed. However, there was a certain by-product which was considered to be a bimolecular reductive condensate of aldehyde or ketone.Reaction with molybdenum trisulfide was proceeded more smoothly than using of molybdenum disulfide.
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.