Steam cracking of straight-run naphtha from Romashkino crude oil was investigated in quartz and stainless steel reactors with a relatively large ratio of Inner surface to volume. The experiments were performed at atmospheric pressure at 780-800 OC for starting ratios of steam to naphtha between 0.5 and 1.0, with residence times of 0.1-0.4. The influence of the reactor material, the temperature, the ratio of steam to hydrocarbon, the residence tlme, and the presence of sulfur compounds is discussed in terms of coke formation and yields of various reaction products. The reaction products were analyzed by gas chromatography, using packed columns for the analysis of the gaseous products and capillary columns for the liquid products. About 200 compounds were identified in the liquid mixture. Reference standard hydrocarbons, published retention data, and mass spectrometry were used for the identifi&tiOn.
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Bajus et al. (1980) studied this question.