Sciencemadness Discussion Board

RDX from dilute HNO3

Pard - 19-1-2014 at 02:32

Hello

I read a thread on here on the PETN thread that gives a table for calculating the amount of H2SO4 to add to HNO3, when dilute.

Would this same technique work for RDX? I wouldn't think so. Everything I've read indicates it needs 90% percent but as the PETN similarly requires high percentage, I wondered if if the sulfurics effect on the water in the HNO3 might make it work able. I think no but just thought I'd ask and consider it a learning experience. It seems distillation of the hno3 is unavoidable.

I can try find the mention post if needed

Dornier 335A - 19-1-2014 at 02:44

Sulfuric acid decomposes hexamine. That's why mixed acid can't be used in the production of RDX. WFNA has to be used instead.

DubaiAmateurRocketry - 19-1-2014 at 04:09

What about 70% Nitric acid and P2O5 ? Will it increase RDX yeild ? or some HMX along with it ? I've seen Ac2O/HNO3, however I havent seen HNO3/P2O5 nitration on hexamine yet.

Fantasma4500 - 19-1-2014 at 06:25

yes it will.. indeed it will
P2O5 produces acetic acid with water

the question is ratios, you might wanna experiment and write down some ratios that work?

http://puu.sh/6qqcf.txt

this regards HMX and DPT from HDN, if im not entirely wrong, another compound near if not above RDX's properties


Pulverulescent - 19-1-2014 at 07:14

Quote:
...P2O5 produces acetic acid with water...

Sheeesh! P2O5is the anhydride of phosphoric acid!

DubaiAmateurRocketry - 19-1-2014 at 07:16

I was just about to point that out, he probably made a mistake... any ways, P2O5 seem to work, ofcourse ill record whatever i do, if I ever have the chance. Shipping through dubai is a hard...long...expensive process.

Pulverulescent - 19-1-2014 at 07:35

Save your money ─ if P2O5 worked in the nitrolysis it'd be very widely known . . .

DubaiAmateurRocketry - 19-1-2014 at 07:43

Well it is, its used in many synthesis. P2O5 could also produce NO2+ like sulfuric acid.

Pard - 19-1-2014 at 18:14

I guess it will need to just distill it. I didn't think so, but thought I'd ask. I do remember seeing a tek posted here involved Glacial Acetic Acid. Though I don't think it had good yields.

Motherload - 19-1-2014 at 19:18

Anyone ever try mixed acid nitration of Hexamine or HDN using 70% HNO3 and excess 85% H3PO4 ?