Process for producing pure concentrated ammonia

A process for the recovery of pure concentrated ammonia from a gas water resulting from the condensation or washing of coal degasification or coal gasification gases comprising the steps of:

• a. filtering said gas water;
• b. extracting the filtered gas water of step (a) with di-isopropyl ether as a dephenolating solvent to produce a dephenolated water containing NH.sub.3, HCN and traces of residual solvent and a phenol-laden solvent phase;
• c. recovering solvent from phenols of said solvent phase and recycling the recovered solvent to step (b);
• d. stripping the dephenolated gas water of step (b) to produce a gas phase containing CO.sub.2, H.sub.2 S, HCN, NH.sub.3 and residual solvent;
• e. chemically washing ammonia from the gas phase of step (d) to produce a substantially ammonia-free gas phase and an ammonia-laden absorbent phase;
• f. separating ammonia from said absorbent of the ammonia-laden absorbent phase, collecting the separated ammonia product, and recycling said absorbent to step (e);
• g. washing HCN from the ammonia-free gas phase of step (e) to produce a gas containing traces of residual solvent;
• h. scrubbing residual solvent from the gas of step (g) with circulating phenol to produce a phenol-scrubbed gas and a solvent containing phenol;
• i. distilling solvent containing phenol produced in step (h) to separate the solvent thereof from the phenol delivering the solvent to step (b) and returning the phenol to step (h);
• and
• j. afterscrubbing the phenol-scrubbed gas of step (h) at least in part with filtered gas water from step (a).