Chemical Fertilizers: Proceedings of the XVII International by Giacomo Fauser

By Giacomo Fauser

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4 - Region of zone decomposition in t h e system ammonium nitrate-ammonium dihydrogen phosphatepotassium chloride. HTJYGEN a n d P E R B A L [40]. grams such as t h a t shown in Figure 4 for the ammonium nitrate-ammo­ nium phosphate-potassium chloride system. The main conclusion from both is t h a t a solid matrix a t the decomposition temperature is an impor­ t a n t factor in governing whether and a t what rate t h e self-sustaining reac­ tion will propagate. The greater the tendency for the fertilizer to become 46 molten, or to contain large amounts of liquid phase, before the decom­ position temperature is reached, the less likely is the material to propagate the decomposition reaction.

33 kcals/mole. The solid solution can also react with potassium chloride (equation 8). 43 kcals (8) I t is this reaction, and/or the simple reversion of the solid solution to the stable form t h a t results in the self-heating of fertilizers in the pre­ sence of urea. The thermochemistry of the above process has been investi­ gated at Levington Research Station [36]. I t will be seen t h a t the heat evolved from reaction [8] is greater than t h a t from the straightforward ionic exchange reaction (7).

1955, 23, 693. [5] M. A . COOK a n d T. A B E G G , " I n d . E n g . ", 1956, 48, 1090. [6] R . D . SMITH, "Trans. Faraday S o c " , 1957, 53, 1341. [7] W . A . R O S S E R , S. H . I N A M I a n d H . W I S E , " J . P h y s . ", 1963, 67, 1753. [8] B . ROZMAN and L. BORODKINA, " J . Applied Chem. ", 1959, 32, 291. [9] T. L . D A V I S a n d A . J . J . A B R A M S , " J . Amer. Chem. S o c " , 1925, 47, 1043. [10] L . F R I E D M A N N a n d J . B I G E L E I S E N , " J . Chem. P h y s " , 1950, 18, 1325.

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