| 摘要 |
1511726 Multi-effect evaporation process DRAVO CORP 18 Aug 1975 [30 Oct 1974] 34221/75 Heading B1B In a process for the multiple-effect evaporation of a liquid comprising water, volatile organic liquid and dissolved solids to obtain at least one aqueous solution of the volatile organic liquid and an aqueous composition which comprises the solids and is substantially free of the volatile organic liquid, the vapour discharged from the evaporation zone of the last effect counting in the direction of liquid flow is counter currently contacted with the liquid stream being fed to the said last effect at a place which is upstream of the said last effect but downstream of the last but one effect counting in the direction of liquid flow. The liquid to be evaporated may be obtained by extracting defatted soyabean flakes or fish residues with an aqueous alcohol (e.g. methanol, ethanol, isopropanol). |
