Modern Gasworks Practice

540 MODERN GASWORKS PRACTICE for purifying the gas whilst the otter is given up to revivification of the oxide. The two sections are reversed at intervals—the one whicli was revivifying doing the purification, and vice versa. After leaving the ammonia still, the gas passes through the special oxide of iron in the purifier and thence into the base of the Fig. 340.—Line Diagram showino Bubkheisbk’s Procbss. ammonia washer. An acid solution is admitted to the top of the washer. and in this way the ammonia is neutralized and washed out from the gas. The neutral liquor, or lye, flowing from the washer is collected and used in the other side of the plant. The gas, free from all impurities, passes out at the top of the ammonia washer as shown. When the oxide has absorbed itsmaximum quantityof H2S, the gas is deflected