| 摘要 |
PURPOSE:To readily and efficiently obtain the subject compound in a high yield while reducing pressure loss as low as possible by vapor phase intramolecular dehydration of an alkanolamine at a high temperature and a reduced pressure using a catalyst of a specified size-column having a hollow part. CONSTITUTION:An alkanolamine such as monoethanolamine of formula I (R and R' are H, CH3 or C2H5) is used as the raw material and vapor phase intramolecular dehydration is carried out in the presence of a phosphorus-based catalyst having an outer shape of a column with 3-10mm D outer diameter and length L of 0.5-2.0 times of the outer diameter, having a hollow part with 10-80vol.% of the total volume in the ordinate axis direction and having a composition, preferably of formula II, formula III, etc., in an atomic ratio at 300-600 deg.C, a reduced pressure of 10-200mm Hg and 50-2000hr.<-1> space velocity of the raw gas to obtain the objective compound of formula IV such as ethyleneimine useful as the raw material, etc., for an amine-based polymer which is a raw material for medicines, pesticides, etc., and a textile treatment. |
