Study of diesel fuel stability on oxygen absorption. III. Changes of ratesand accelerations of oxygen absorption

The changes of oxygen absorption rates (OARs) and oxygen absorption acceler ations (OAAs) for Daqing straight run diesel fuel (SRDF) and hydrogenated c oking diesel fuel (HCDF) have been theoretically studied at 290 similar to 360 K under 0.10 similar to 0.25 MPa(O-2) and Cu catalysis in darkness base d on the investigation of kinetics of oxygen absorption for diesel fuels. T he theoretical results show that OARs and OAAs of two diesel fuels decrease rapidly with the increasing of time, while they increase clearly with the rising of oxygen pressure or temperature at given test conditions during ox ygen absorption. The higher the temperature and oxygen pressure or the long er the time, the greater the changes of diesel fuel OARs and OAAs, The OARs and OAAs change more clearly at shorter time (<30 h) or higher oxygen pres sure (>0.15 MPa) or higher temperature (>330 K), while they vary a little a t longer times or lower O-2 pressure Or lower temperature. The (initial) OA R and (initial) OAA of HCDF are much greater than that of SRDF. There is gr eat difference between two diesel fuel OARs and OAAs.