| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a purification method for diisocyanate which can purify diisocyanate at a high yield from a mixture containing the diisocyanate and alcohol. <P>SOLUTION: Using a purification apparatus 3 having a rectifying tower 8, and a condensation system 10 connected to the downstream side of the rectifying tower 8 and equipped with a first condenser 12 and a second condenser 22 which are connected to each other in series, a mixture containing diisocyanate and alcohol is purified in the rectifying tower 8 and the condensation system 10 in order. Diisocyanate can be obtained at an excellent yield by this diisocyanate purification method. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
