Abstract: An improved coke oven gas washing process for removing hydrogen sulfide is proposed wherein the coke oven gas is treated in a hydrogen sulfide scrubber by counterflow with an aqueous ammonia wash water. A stream of aqueous weak ammonia liquor is cooled and sprayed through nozzles in the mid-region of the hydrogen sulfide scrubber. A quantity of aqueous ammonia liquor, corresponding to the quantity which is sprayed through the said nozzles, is withdrawn from the hydrogen sulfide scrubber at a level below the nozzles and is introduced into the top of the said hydrogen sulfide scrubber. Ammonia vapor released at the nozzles has a higher partial pressure than the ammonia partial pressure of the coke oven gas in the region of the nozzle. The aqueous ammonia liquor from the deacidifier is the source of the cooled aqueous ammonia liquor which is introduced through the nozzles.

Abstract: Hydrogen sulfide is first removed by ammoniacal liquor from coke oven gas in the bottom part of a gas scrubber. In the top part of the scrubber, two consecutively-arranged fine scrubbing stages remove hydrogen sulfide by treating the gases, in the upper stage, with a caustic soda solution or a caustic potash solution. Beneath the upper scrubbing stage is the second fine scrubbing stage fed with a subflow of an aqueous carbonate solution collecting at the outlet of the upper fine scrubbing stage and a subflow of cooled, regenerated carbonate solution discharged from the hydrogen-sulfide/hydrogen-cyanide stripper. From the hydrogen-sulfide/hydrogen-cyanide stripper, a second subflow is admixed with coal liquor for removing fixed ammonia therefrom in a separator. The separator produces water vapor with carbon dioxide vapors that are delivered to the hydrogen-sulfide/hydrogen-cyanide stripper for regenerating the aqueous carbonate washing solution.

Abstract: An improved sulfur-ammonia process for removing hydrogen sulfide from coke oven gases. In the improved process, a concentrator formerly used for standby operation is used at all normal times as an ammonia scrubber to improve the efficiency of gas separation during normal operation and is used as a concentrator for its intended standby functions during the alternative operations. In its normal function, the concentrator/scrubber functions as a scrubber to strip ammonia gas from recirculating liquid streams and to permit introduction of an ammonia-rich gas into a hydrogen sulfide scrubber to increase the separation efficiency of that unit. In the standby operation, the same concentrator/scrubber serves as a concentrator to concentrate hydrogen sulfide in a "strong liquor" stream for separate recovery as a "strong liquor.

Abstract: Washing fluid is distributed in a scrubber or a stripper to treat a countercurrent gaseous or vaporous stream by spigots receiving fluid from a tray for discharge onto spray pipes underneath a nozzle at the end of the spigot. A casing surrounds the spigot in a concentrically-spaced relation to a point where slots in the spigot discharge fluid onto a spray plate carried on the lower end of the spigot above the nozzle. The spray plate on the spigot includes a base section with a slotted edge section having some of the slotted portions bent upwardly and others bent downwardly while others are completely removed. The base section supports downwardly-extending fingers that extend into space. A frame carried by the casing supports an upper and smaller spray plate above a lower and larger spray plate all beneath the nozzle in the spigot. The upper and lower spray plates each have upwardly- and downwardly-bent edge portions carried by a base plate.

Abstract: A method for removing hydrogen sulfide from gases, particularly coke oven gas, and for obtaining elemental sulfur in a Claus plant, characterized in that sulfur dioxide and elemental sulfur in the residual gases from the Claus plant are hydrogenated to form hydrogen sulfide which is mixed with incoming coke oven gas or the like prior to passing into a hydrogen-sulfide scrubbing unit. In this manner, essentially no sulfur compounds escape into the atmosphere.