Ammonia scrubber

With the stirrer in rapid motion (Note 2) phosgene is passed into the solution of anthranilic acid at such a rate that bubbles of gas escape slowly into the ammonia scrubber (about two... 

Fig. 38. Caustic purification system, a, 50% caustic feed tank b, 50% caustic feed pumps c, caustic feed preheater d, amonia feedpumps e, ammonia feed preheater f, extractor g, trim heater h, ammonia subcooler i, stripper condenser j, anhydrous ammonia storage tank k, primary flash tank 1, evaporator reboiler, m, evaporator n, caustic product transfer pumps o, purified caustic product cooler p, purified caustic storage tank q, ammonia stripper r, purified caustic transfer pumps t, overheads condenser u, evaporator v, evaporator vacuum pump w, aqueous storage ammonia tank x, ammonia scrubber y, scrubber condenser z, ammonia recirculating pump aa, ammonia recycle pump. CW stands for chilled water.

Fig. 1. Schematic diagram of the testing equipment A - reactor B - catalyst C - ammonia scrubber 0 - NOx analyzer E - flow meters.

In general, when gas is purified by the old process of ammonia scrubbers and iron oxide purifiers, about 33 per cent, of the HCN condenses with the ammonia, and only 50-70 per cent, in the iron oxide purifiers, the rest of the HCN passing away with the coal gas, causing corrosion of the gas holders and meters. 

Pollution Unlimited, an Aldo Leone Corporation, has submitted design plans to Theodore Consultants for a packed ammonia scrubber on an airstream containing NH3. The operating and design data provided by Pollution Unlimited, Inc. are given below. Theodore Consultants remember reviewing plans for a nearly identical scrubber for Pollution Unlimited, Inc. in 1988. After consulting old files, the consultants find all the conditions were identieal except for the gas flowrate. What recommendation should be made ... 

The process for granular DAP has an unusual feature all the phosphoric acid feed is used in the two-stage ammonia scrubber, where most of the ammonia lost from the granulator is recovered. The partially neutralized acid from the scrubber has an NH3 H3P04 molar ratio of about 0.25 and is fed to the pipe reactor where the ratio is raised to 1.9 - 2.05, depending on the impurities present in the acid. 

Gas from the granulator is fed through an ammonia scrubber and then a final scrubber before it is vented. Exhaust gas from the dryer also passes through the final scrubber before it is vented to the atmosphere. 

The vapor flashed from the stripper bottoms is condensed and held in a receiver that is vented to the ammonia scrubber. The condensate returns to the process. 

Since the liquor is capable of developing modest vapour pressures the storage tank must be fitted with a suitable relief valve, set in accordance with the design working pressure, either piped to free atmosphere or to an ammonia scrubber. 

Vapor-liquid equilibria of typicai coke-oven gases and liquids obtained in ammonia scrubbers (indirect process) are shown in Figure 4-8. 

A basic flow diagram of the process for removing H2S fiom coke-oven gas using ammonia solution is shown in Figure 4-24. In the process the gas passes through a hydrogen sulfide scrubber and an ammonia scrubber in series. Stripped water is fed to the top of the... 

Rgure 4-25. Diagram of Still Otto process hydrogen sulfide and ammonia scrubber system. Davy/Still Otto (1992)... 

It is desired to reduce the concentration of CO2 in the flue gas from a coal-flred power plant, in order to reduce greenhouse gas emissions. The effluent flue gas is sent to an ammonia scrubber, where the most of the CO2 is absorbed in a liquid ammonia solution, as shown in Fig. E15.3. A feedforward control system will be used to control the CO2 concentration in the flue gas stream leaving the scrubber, Cco2 which cannot be measured on-line. The flow rate of the ammonia solution entering the scrubber, can be manipulated via a control valve. The inlet flue gas flow rate, Qp, is a, measured disturbance variable. 

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