Propane + Nitrogen

The vapor-phase process of SocifitH Chemique de la Grande Paroisse for production of nitroparaffins employs propane, nitrogen dioxide, and air as feedstocks (34). The yields of nitroparaffins based on both propane and nitrogen dioxide are relatively high. Nitric oxide produced during nitration is oxidized to nitrogen dioxide, which is adsorbed in nitric acid. Next, the nitric dioxide is stripped from the acid and recirculated. 

Figure 13.7 Aspect ratio effects on the combustion of a propane-nitrogen jet with oxygen-nitrogen surroundings. Instantaneous visualizations temperature distributions superimposed on vorticity isosurfaces [34] (a) AR = 1 (6) AR = 2...

LNG comes primarily from natural underground reservoirs. Significant quantities are now being recovered from both landfill sources and bioreactor sources around the world. LNG is composed predominantly of methane, which may contain minor quantities of ethane, propane, nitrogen, helium, and other components normally found in natural gas. 

Propane aromatization reaction (at 550°C) was carried out at atmospheric pressure in a continuous flow quartz reactor (id 13 mm), using a propane-nitrogen mixture (33.3 mol-% propane) as a feed with a space velocity of 3100 cm g h". The catalytic activity and selectivity were measured as a function of time-on-stream (up to about 6.7 + 0.2 h). The reaction products were analyzed by an on-line GC with FID, using Poropak-Q (3 mm x 3 m) and Benton-34 (5%) and dinonylphthalate (5%) on Chromosorb-W (3 mm x 5 m) columns. The activity and selectivity data at different space velocities in the absence of catalyst deactivation (i.e. initial activity/selectivity) at 550°C were obtained by the square pulse technique by passing the reaction mixture at different space velocities over fresh catalyst for a short period (2-5 min) under steady state and then replacing the reactant mixture by pure Nj during the product analysis by the GC. 

The methane used was Phillips Research Grade (99.68%) and contained ethane, ethylene, propane, nitrogen, and carbon dioxide. Repurification was simliar to the method described above. However, molecular sieve 13 X was used as the stationary phase. The purified methane contained only nitrogen and much less of the original ethane. 

Pohl et al. [60] measured the combustion efficiency of propane-nitrogen steam-assisted flares. The results indicated that the size of the flare and the soot did not influence the combustion efficiency. The authors reported an efficiency of over 98% for flares operating with stable flames. Kostiuk and coworkers [6,43,61,62] studied the... 

Figure 9. Gas and wall dimensionless temperature history and superficial dimensionless velocity at the outlet end during adsorption step for the propylene / propane /nitrogen system over 13X zeolite under non-isothermal non-adiabatical operating conditions.

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