Of the over 3,000 cement makers in China, only two in Xiangtan (Hunan Province), and another two in Chengdu (Sichuan Province) have denitrogenation
and desulfurization processing, with about one third of cement makers unable to afford the equipment.
Denitrogenation of feeds before HDS was also investigated in order to increase the efficiency of HDS process because N-compounds compete with S-compounds on the catalyst surface .
 have reported that lower-viscosity ionic liquid is more effective for denitrogenation of real diesel.
Zhang, "Extractive desulfurization and denitrogenation of fuels using ionic liquids," Industrial and Engineering Chemistry Research, vol.
First, oxygen breathing at pressure reduces bubble size through Boyle's Law and denitrogenation
of the tissues down a steep tension gradient promotes bubble nitrogen resorption and excretion.
The high nitrogen content in raw shale oil probably makes denitrogenation
during the refinery process more difficult, resulting in the increase of the cost of nitrogen removal.
This has been described by Beatty et al (28) in the setting of open abdominal surgery and confirmed by a subsequent study", and is due to initial denitrogenation
of lung and body NZ stores followed by ongoing absorption of atmospheric NZ by exposed viscera.
The quality of raffinate oil resembles that of 20# diesel, which can be used directly or as the raw material for catalytic cracking after denitrogenation to get more products.
This raffinate product is not suitable to be used as feed for catalytic cracking due to its high nitrogen content, but it can be used to produce light fuel oil after denitrogenation. The removal of nitrogen compounds was also used to separate non-hydrocarbon compounds; the denitrogenated oil can be processed according to the technology for wax oil.
Denitrogenation of diesel distillate from Fushun shale oil
However, denitrogenation was much more difficult than desulfurization even under severe conditions.