| 摘要 |
Removal of phenols from effluent water by extraction with low-boiling organic solvent and recovery of solvent is described. (A) the H2S, CO2 and remaining solvent in the raffinate are driven off under pressure, (B) the vapours washed with a small amt. of cold raffinate under pressure, (C) part of the solvent recovered by condensn. and sepn. under pressure, and (D) the remaining acid gas washed with circulating, cooled raw phenol to remove NH3 and solvent still present. Losses of solvent are reduced, NH3 eliminated from the H2S/CO2 acid gas mixt. in which it causes problems in further processing, and H2S is eliminated from the NH3, in which it causes pollution when the NH3 is burnt. |
