Hydrogen sulphide dispersion

Highly dispersed sols, containing up to 0-082 per cent, of sulphur, may be obtained 3 by passing superheated sulphur vapour, free from air, into air-free water. The sols have an acid reaction due to traces of polythionic acids and hydrogen sulphide. They are white and remain stable for several weeks. 

These effects are less apparent to the manufacturer than to the end user of the polymer dispersion, but they must not be overlooked. Both the foul odours, particularly from hydrogen sulphide, and the actual presence of microbial spores can have a serious effect on man. Hydrogen sulphide levels in contaminated products have never been shown to reach toxic concentrations but even very small amounts can render a product unsaleable. In both of these examples there are strict guidelines on occupational exposure. In the case of microbial spores, overexposure can lead to respiratory disorders and asthmatic symptoms. 

Dry hydrogenations with and without a dispersed sulphided molybdenum (Mo) catalyst (1% loading of Mo) were carried out at 350 and 400 (15)... 

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