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6765006 
Journal Article 
Separation of dinitrogen pentoxide from its solutions in nitric acid 
Chapman, RD; Smith, GD; , 
1996 
AMER CHEMICAL SOC 
WASHINGTON 
78-96 
WOS:A1996BF54K00009 
A convenient process for the separation of nitrogen pentoxide: from its solutions in nitric acid (as commercially prepared by electrolysis of N2O4-HNO3) involves the chemical absorption of the nitric acid by sodium fluoride (producing sodium hydrogen fluoride) in inert organic solvents, such as acetonitrile, suitable for use with many nitrolyzable substrates. Contact time between the N2O5-HNO3 solution and the sodium fluoride solid is critical due to a competing sorption of the N2O5 in the later stages of the process, speculated to be due to hydrogen bonding between N2O5 and NaHF2. During this stage, continued contact of the solution with the partially spent acid absorbent (sodium fluoride) removes even small amounts of residual nitric acid but also lowers the recoverable yield of N2O5. 
Albright, LF; Carr, RVC; Schmitt, RJ; 
0-8412-3393-4 
Symposium on Nitration - Recent Laboratory and Industrial Developments, at the 209th National Meeting of the American-Chemical-Society 
ANAHEIM, CA