Ammonia is a common substance found in the wastewater generated from oil refining and coal chemical processes. It is convenient and economical to recover the ammonia from these waste water streams and use the ammonia as the absorbent to treat gaseous pollutants. The synthesis of ammonia from hydrogen-containing tail gases or directly from coal is also an option for ammonia sourcing.
JET’s multiple ammonia sourcing solutions can meet client’s ammonia supply requirements by utilizing recovered ammonia from waste streams. A stable, cost-effective ammonia supply also decreases operating cost of the EADS process.
Coal-based Ammonia Synthesis Technology
Raw gas produced in coal gasification is processed through the water-gas shift reaction, the Rectisol process, and methanation to produce synthesis gas. Synthesis gas is compressed and fed into the ammonia synthesis unit to produce anhydrous ammonia, which is stored in ammonia storage tanks. Vent gas from the storage tanks is also recycled to the system.
Ammonia Recovery from Sour Water
A single-column pressurized process is used for sour water stripping. The process schematic diagram is shown in the following figure.
Ammonia Recovery from Coal Gasification Waste Water
The coal gasification process generates a large amount of waste water that contains a high-concentration of pollutants. JET has developed a unique process to recover phenol and ammonia from coal gasification waste water. The process flow is shown in the following figure.
Ammonia Synthesis from Hydrogen-containing Tail Gases
Purge gases from many chemical processes often contain hydrogen at relatively high concentration. Hydrogen is purified by pressure swing absorption (PSA) and mixed with nitrogen to synthesize ammonia.
|Anhydrous Ammonia||≥ 99.6%|