Oxidative carbonylation of aniline using manganese-base catalysts

• Main Authors: Wang, Shen-Zen, 王順仁
• Other Authors: Li, Kuo-Tseng
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/44153477077898444463

碩士 === 東海大學 === 化學工程研究所 === 82 === Oxidative carbonylation of aniline to ethyl phenyl carbamate ( EPC ) over manganese catalyst is the key step for the pre- paration of methyl diphenyl diisocyanate (MDI) via nonphosgene route. The effect of catalyst load, temperature, oxygen partial pre- ssure, carbon monoxide partial pressure, solvents and promoters on the activity and selectivity of aniline carbonylation has been investigated under the condition of 25 ∼ 130 kilo- gram per square centimeter, 90 ℃ ∼ 190 ℃. The reaction rate increase with the increase ofcarbon monoixde and oxygen partial pressure, and the bestreaction condition for selectivity and activity has been found to be at T=170℃, Pco=61.3 kilogram per squrare centimeter and PO2=3.7 kilogram per square centimeter. Conversion increase linearly with catalyst load, and the real active compound for the catalytic system has been found to be Mn(CO)5Br.