| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an industrially advantageous production method of purified pentamethylene diamine, wherein aqueous pentamethylene diamine containing salts as impurities is used as a raw material and a desalination treatment is carried out to avoid various problems caused by the salts. <P>SOLUTION: In the production method of purified pentamethylene diamine, the aqueous pentamethylene diamine containing salts as impurities or an extract solution thereof is distilled and purified. Prior to the distillation and purification, the aqueous pentamethylene diamine containing salt impurities or the extract solution thereof is subjected to a desalination treatment so as to achieve a salt content of≤3 wt.%. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
