May be these two links can help you
http://www.google.com/patents/US3856673
http://www.google.com/patents/US2348328
Garlando, any idea how to oxidize organics at low temperature? It appears that the patent talks about carrying out oxidation at 180 C. EHN at that temp. would decompose leading to runaway reaction! We are now talking about large scale manufacturing!!
Regards.
The spent acid that you have is a mixture of H2SO4 and HNO3?
What do you want to do with the spent acid recovered after purification?
How much spent acid do you have?
There is a system for oxidize organics at low temperature by persulphate salt and UV light, but I'm talking of reactions that usually are used in the lab.
On large scale may be it is difficult to apply that is used in lab (and sometimes it is the opposite)
Give me more information and eventually I can ask information by a friend that work in a Sulphuric manufacturing plant (he receives sometime H2SO4 spent acid from oil refinery)
Spent acid is essentially 80-84% H2SO4, 3-5% HNO3 and balance water. Additionally, there is 0.6-1% Ethylhexyl Nitrate forming an mostly immiscible layer on the top. Stability and hence safety is a critical issue for acidic EHN. Therefore, it is absolutely imperative that EHN be removed 100% from spent acid.
Hi
Patent talks about temperature; but what about pressure. maybe you can use vacuum in range of 50-100 torr.
Regards
Binoy Shah
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