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There are all sorts of varieties of Claus plant configuration, the choice of which depends on the composition of the acid gas being processed. There are also a number of different types of tail gas treatment process, some of which may influence the operation of the main plant because they feed...

Alas! The best I can do for you at the moment is a chart relating the specific heat (Cp) in Btu/lb/degF to HNO3 concentration and temperature (deg F), which is on page 26 of "Nitric Acid and Fertilizer Nitrates", ed. C. Keleti (Marcel Dekker, 1985).

What sort of furnace is it? If it's something highly stressed like a steam reforming furnace, you also need to consider the metallurgical impact of heavy metal impurities in the fuel oil on the catalyst tubes. Clean, trouble-free operation is worth a fair premium on the fuel price. You have to...

I think 25362 is dead right - this way of obtaining ammonia would appear to be quite inappropriate for your process. Do you mind my asking why you make nitric acid on such a small scale? (You mentioned 10 t/d of ammonia). It must be a fairly high-cost operation!

There's another company who you ought to contact: Siirtec Nigi, Milano, Italy. They have developed a process called AMMOGEN for producing ammonia from urea. It is targeted at Selective Catalytic Reduction systems for NOx abatement in combustion and other exhaust gases. I'm not sure what the...

In case you have not yet found a suitable outfit to design your stripper, the following should be able to help. Stamicarbon BV (Geleen, Netherlands) - leading urea process (including condensate treatment) licensor Uhde GmbH (Dortmund, Germany) - Stamicarbon-licensed contractor with extensive...

Jayboz Ammonia will react with any SO2/SO3 in the exhaust gas to form solid ammonium sulphite/sulphate. The blue colour is due to the extremely small (sub-micron) particle size, which also makes such fumes fairly difficult to arrest. It sounds as if the SCR unit needs tuning up a bit; in most...

jayboz: Is there any ammonia in the surrounding air? That will give you a lovely blue plume!