| 摘要 |
<p>Disclosure 5333 PROCESS FOR RECOVERING DISSOLVED IMINODIACETONITRILE FROM EFFLUENT LIQUORS A process for recovering iminodiacetonitrile (IDAN) values from an aqueous IDAN solution comprising: (a) extracting the aqueous IDAN solution with methylene chloride to dissolve a portion of IDAN in the methylene chloride to form a methylene chloride solution of IDAN; and (b) separating and recovering the IDAN values from the methylene chloride. In an alternative embodiment the IDAN values can be separated from the methylene chloride solution of IDAN by extracting the methylene chloride solution with an aqueous alkali metal hydroxide solution to form water-soluble dialkali metal iminodiacetate (IDAM2 wherein M is an alkali metal cation) which remains in the aqueous alkali metal hydroxide solution. The IDAM2 can be recovered from the alkali metal hydroxide solution by conventional methods (e.g., by treating with a strong acid to precipitate iminodiacetic acid (IDA)). Each extraction (the extraction with methylene chloride and the extraction with aqueous alkali metal hydroxide solution) can be conducted as a batchwise extraction or as a continuous counter-current extraction.</p> |
