| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To recover an organic component contained in a recovered liquid, which is obtained by recovering the mist-like or liquid drop-like mixture produced from the region ranging from the middle part to upper part of the washing column of an ethylene manufacturing plant by the countercurrent contact of a decomposition gas of naphtha with a sodium hydroxide aqueous solution in the washing column, or contained in the separated liquid after a useful gas is separated from the recovered liquid before the organic component is discharged out of the system. <P>SOLUTION: In this treatment method for the treatment liquid from the washing column of the ethylene manufacturing plant, the separated liquid or recovered liquid itself is mixed with the alkali aqueous solution, of which the concentration is adjusted, supplied so as to be sent to a treatment process for the wastewater discharged from the lowermost stage part of the washing column of the ethylene manufacturing plant to reduce drain quantity, and the organic component contained in the wastewater and the separated liquid is efficiently extracted with an extraction solvent to be recovered by increasing the concentration of alkali in an extraction process. <P>COPYRIGHT: (C)2004,JPO</p> |
