Journal . th an industrial process which givesoff oxygen as a by-product. There are several suchindustries. For example, the manufacture of hydrogenfor aircraft ; the manufacture of calcium cyanamide;one method of manufacturing sodium cyanide. Thereis also the manufacture of hydrogen for increasing thedensity of oils for margarine, etc. The production of hydrogen is carried on at the aircraftfactory at South Farnborough and some of the oxygenthere produced is sent to Woolwich Arsenal and otherworks for oxy-acetylcne welding but this only absorbs aportion of the outpi:t. The oxygen produced in
Journal . th an industrial process which givesoff oxygen as a by-product. There are several suchindustries. For example, the manufacture of hydrogenfor aircraft ; the manufacture of calcium cyanamide;one method of manufacturing sodium cyanide. Thereis also the manufacture of hydrogen for increasing thedensity of oils for margarine, etc. The production of hydrogen is carried on at the aircraftfactory at South Farnborough and some of the oxygenthere produced is sent to Woolwich Arsenal and otherworks for oxy-acetylcne welding but this only absorbs aportion of the outpi:t. The oxygen produced in a calcium cyanamide factory isa by-product from the manufacture of nitrogen by theliquid air process, the nitrogen being necessary toconvert calcium carbide to cyanamide. At the presenttime all the oxygen produced at the Odda works in Norwayis wasted, because the company is not allowed to bottleand sell it. There are seven Linde plants each producing350 cubic pure nitrogen per hour, or a total of. ?n -s ^- a ?e- 5 u a UJ ^ Vol. XXXIV., No. S.] SCOTT—PRODUCTION OF NITRATES FROM AIR. 121 2450 cubic metres. The aiuouut of oxygon wasted per 2450x21hour ia therefore ;:: = 650 cubic metres per hour. This oxygon is piiro. because for making cyanamidc itia essential to have the nitrogen absolutely pure. Conse-quently it is very expensive. In tho direct furnaceprocess the case is quite ditTorent, luciiuse the o.\ygen isonly rinuiretl to raise tho percentage of oxygen until itand the nitrogen are about equal. A plant to do this issimple and cheap. Absorption Syatein. When the air plus tho make-up oxygon passes throughthe furnace sonio of it is converted into nitric andwe will now trace the progress of the gases as they maybe callfd through the rest of the apparatus. They lirst go to a nest of cooling tubes made of alu-minium (see top of Fig. 9), over which water ia flowing,then through the jin-heatcr where some of tho heat isimparted to the supply to the furnace, and t
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
