Process for producing pure concentrated ammonia
First Claim
Patent Images
1. 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 NH3, 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 CO2, H2 S, HCN, NH3 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).
0 Assignments
0 Petitions
Accused Products
Abstract
A process for the recovery of pure concentrated ammonia in which the gaseous products of coal gasification or degassing are condensed or are washed with water to produce a phenolic-containing liquid phase (gas water), this liquid is dephenolated by extraction with a solvent, the phenol is recovered from the solvent and the gas is driven from the liquid phase. The gas is washed with circulated phenol and residual solvent is eliminated therefrom after NH3 is removed by washing.
-
Citations
7 Claims
-
1. 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 NH3, 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 CO2, H2 S, HCN, NH3 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). - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification