Show Valtiablo BiProducls ol the Coke Oven In a coal like the Connellsvllle coking coal containing from 29 per cent to 35 per cent of volatile matter there la from 8000 to a little over 9000 cubic feet of gas per short ton On this basis the 20000000 tons of cool coked In the United States last year would produce more than 260000000000 cubic feet of gas Allowing1 onehalf of this production pro-duction for consumption in the oven we have remaining over 12000000000 or about onehalf the annual natural gas production during the height of that excitement To convert this fuel gas into Illuminating gas Involves a change In the operation of the oven so that gas produced with the recuperation of air and gas may be burned In the flues instead in-stead of this rich coveoven gas Ammonia that is ammonia sudphate is the most valuable of the byproducts of cokemaking It having a market value of about t20 per ton The yield of this byproduct from each ton of coal coked Is about twenty pounds or a total yield of over 300000 tons for the 30000000 tons of coal coked Jn the Slates last year which would make the value of this byproduct over 6000000 The yield of tar is about sixty pounds per ton of coal coked Byproduct tails tai-ls superior to tar that comes from the gas works It contains less amount of pitch and Its fuel value Is about 5 per ton which would give a value of nearly 55000000 for this product from the coal consumed in coking last year In their primary state the combined byproducts of cokemaking have a value of close to 1 for each ton of coal coked After passing through the complex processes of modern chemistry chemis-try these have a much greater value W G Irwln In the Engineering Magazine Maga-zine for October |