Nitrogen: Sulphur ratio

We have tried to increase the reactivity of modified polystyrene by introducing sulphur bonds with small dissociation energy into its macromolecules. For that purpose we carried out styrene polymerization with tetramethylthiuram disulphide in the presence of sulfur as an initiator. The chemical composition of modified polystyrene was as follows 83.02% C, 7.28% H, 1.07% N, 7.91% S (Table 1). As acconsequence of the addition of sulfur to the reaction medium the sulfur/nitrogen mole ratio increased from 2 1 to above 3 1. The average molecula weight of po lystyrene modified by thiuram and sulfur was low, Mv = 2030 and = 2080. 

Nitrogen content in nitrocellulose, % Sulphuric aci total amount d content, % bonded as inorganic salts The ratio of the total amount of acid to the part bonded as inorganic salts... 

For mixed acids with a constant sulphuric to nitric add ratio, the nitrogen content of the nitrocellulose falls as the proportion of water increases (Fig. 120). 

Recently extensive investigations on the nitration of starch, mainly by using mixed nitric and sulphuric acid have been carried out by Kunz and T6th [46]. Their object was to determine the effect of the ratio of the components in the nitrating mixture and the activity of nitric acid in the mixtures on the nitrogen content of the nitrostarch, the heat of esterification, and the relation between the nitration temperature and the viscosity of the product. Their observations concerning the time of reaction are of special interest. This varies as a linear function of the nitration temperature. In the graph (Fig. 169) the relationship is shown for two mixed acids ... 

Synthesis gas may be prepared from any feedstock containing any ratio of carbon and hydrogen and oxygen and not extreme levels of sulphur and nitrogen. Such a definition covers feedstocks ranging from wood, biomass, coal and heavy fuel oils, to naphtha and natural gas. 

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