;orubliing lixs bacii Eouud to bo 4 to 5 per cent clienper tiiari high-pressure water scrubbing, when making 0120-per-ton ammonia. In addition the carbon dioxide is obtained in a T-eV piire Emn siiittible, for variims uses.
built inairily of iron nlrd steel, urily those parts diieli could bc cimveiiieijtly fabricated of aluiiiinurn were built oE this mct:il. KO troubie was experienced in the corrosion of any or the aluminum pipes, coolers, or tlie ariimonia still, nor wiis any corrosion detected iii laboratory tests of this niaterial or some of t.iie types of stniiiless steel on the market. 'The iron pipes and wdvea, however, were badly corroded :ind required reniornl at iritervnls. Another source of difiiculty was the reduct.ioii of the nih t e radical of the aininonium nitrate by the iron. This reduction appareiitiy proceeded rather rapidly in the case of the solutioiis contsiniiig as high as 50 per cent of amirioniiim nitrate, hut much slower in the case of t.he 30 per ccmt stilution. Iaboratory tests on the destruction of the nitrate radical by various metals showed that this cffed was illrseiit in the case of coinmercial aluniinurn metal. These results lead to the belie[ that a plant or this kind could be satisfactorily built of chemical stoneware and alumirium. Ahiminum pipe and fittings are already on the market. Aluminum valves, however, cannot a t present be readily obtained, but for this purpose there seems to be no reasoii why they cannot he developed, utilizing some of the stairiless steels for seats and valve .;;tent:-.
I'lgrire 4-Erferlur of Experiments1 Cas-ScrUbblng Plant
Aoknowledgrnent
Corrosion Difficulties
Some difficulties were encountered because of the corrosive properties of the solution. The experimental plant was
The witers wish to acknowledge the assistance of C. F. Weston and V. L. Geddy during the construction and operatiori of the experimenial gas-scrubbing plant.
Recent Developments in the Preparation and Use of Concentrated Fertilizers' By Wm. 11. Ross, Arnon I,. Mehring, and Albert I
