Сhemical resistance and stabilization of starch nitrate

It was studied the Processes of ensuring chemical stability (stabilization) of starch nitrate obtained by nitration of starch by two ways: nitric acid and nitric-sulfuric acid mixture. It has been confirmed that, in the first case, starch nitrate has much higher stability due to the absence of low-stable sulfuric acid esters. It is shown that to ensure it in this case, 10 minutes of washing of starch nitrate in 0.19 m3/kg of hot water (95 °С) is sufficient. It was established that in the case of nitration with nitric acid, an increase in the nitrogen content in starch nitrate, which characterizes the amount of nitroester bonds in it, leads to a decrease of the temperature atthe beginning of active decomposition, whichapproaches 168 °C for the maximum nitrogen content (14.14 %). This temperature is proposed as an indicator for evaluation of starch nitrate chemical resistance.The obtained data are necessary for the development of starch nitrate production technology.