Multistep process for the preparation of alkyl mono and diisocyanates consisting in reacting the corresponding aliphatic amine or diamine with dimethylcarbonate and, substantially, in partially vaporizing and converting the urethane thus formed in an evaporator to subsequently terminate the cracking in a II DEG reactor, and finally subjecting the cracking product to fractional distillation at reduced pressure, recycling the unconverted part to the partial vaporization step. <IMAGE>
申请公布号
DE69316433(D1)
申请公布日期
1998.02.26
申请号
DE1993616433
申请日期
1993.05.08
申请人
ENICHEM S.P.A., MAILAND/MILANO, IT
发明人
MIZIA, FRANCO, I-20097 SAN DONATO MILANESE (MILAN), IT;RIVETTI, FRANCO, I-20139 MILAN, IT;ROMANO, UGO, I-20059 VIMERCATE (MILAN), IT