Explosives . H2O,H,S0, Fig. 28. Degree of Nitration of Nibro-cotton a~ a Function of tIh- Molecularmpoaition of Mixed Acid and the Vapour Tension f tin- Nitric Acid collodion cottons completely or almost completely soluble in nitro-cottons between the two curves have an intermediate degree ofsolubility, 1 to !?<• per cent. ; (hose outside the outer one are almost insoluble. H2S0< THEORY OF NITRATION OF CELLULOSE 139 It will be seen that the molecular percentage of water in the mixed acid isthe principal factor in determining the solubility. This diagram will be of HNO,
Explosives . H2O,H,S0, Fig. 28. Degree of Nitration of Nibro-cotton a~ a Function of tIh- Molecularmpoaition of Mixed Acid and the Vapour Tension f tin- Nitric Acid collodion cottons completely or almost completely soluble in nitro-cottons between the two curves have an intermediate degree ofsolubility, 1 to !?<• per cent. ; (hose outside the outer one are almost insoluble. H2S0< THEORY OF NITRATION OF CELLULOSE 139 It will be seen that the molecular percentage of water in the mixed acid isthe principal factor in determining the solubility. This diagram will be of HNO, -to. HN03 ,HX O3 ,HxSO¥. HzO,HzSCV Fig. 29. Degree of Nitration and Solubility of Nitro-cotton as a Function ofthe Composition of the Acid assistance in determining what composition of acid is required to producea nitro-cotton with any specified degree of nitration and solubility, but itmust be remembered that it is based on laboratory experiments, which were 140 EXPLOSIVES Soluble nitro-cellulose. carried out under very different conditions from those that prevail in the work-. The cotton used for these experiments was generally cotton-wool, whichi- different in many respects to the cotton waste mostly used on the largeBcale : it i- of much inure open texture, each fibre being separated from thethei>.. bo that the acid can -oak iii very readily, thus facilitating the as a result the material i- very bulky, and for this reason inconvenientto use on a manufacturing scale, as it requires a very large proportion of mixedacid. Cotton-wool lias often been subjected to a very drastic bleach
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