Ethylhexanol Nitrification Preparation The Isosorbide Octyl Synthesis Process Thermal Hazard Of The Preliminary Study

The nitrification process of producing 2-Ethylhexyl nitrate(EHN)by dosing isooctyl alcohol to nitric-sulfuric acid mixture is with greater risk of heat, and domestic similar process has been two explosions occurred.So,about the thermal hazard of this process, it is necessary to carry out the systems analysis, testing, evaluation and investigation on the direction of security control.In this paper, Reaction Calorimeter(RCle) was used to measure the thermodynamics parameters of this nitration in semi-batch reactor, additionally, Differential Scanning Calorimeter(DSC) and Accelerating Rate Calorimeter (ARC) were used to study the secondary decomposition characterizations of the product, thereby, evaluating the thermal runaway criticality of the reaction. First of all,the thermodynamics behaviors of products and reaction system under non-isothermal mode were studied by DSC.Then a series of experiments were carried out with RCle to study the influence of several parameter, such as reaction temperature and dosing time on the exothermic character of the reaction; Some parameters such as adiabatic temperature increase of batch reaction(△Tad),maximum temperature of synthetic reaction(MTSR) were obtained here. After that, ARC was used to study the thermal decomposition of the product, the relation curve of the induction period and temperature can be fitted. Also the temperature when the explosion happened on 24h(TD24) were analyzed. Finally, combining the datum from ARC and RCle, the risk class of thermal runaway criticality is studied.The results indicate that about the mixture of the mix acid and the 2-Ethylhexyl nitrate, the more the content of the mix acid was, the lower was the onset of the secondary decomposition of 2-Ethylhexyl nitrate. The process conditions of the synthetic reaction should be severely controlled, especially the reaction temperature. When the temperature is above 20℃,its risk class of thermal runaway reaction is class 5,which is very dangerous. Through the purity test of several reaction products under different conditions, it is found that the rate of production is lower if the reaction temperature blew 30℃.So, further optimizing the processing condition on assuring the security of the process of producting should be developed, to reach the best economic benefit.