| 摘要 |
<p>1,268,237. Alkanolamines. MO OCH DOMSJO A.B. 20 Aug., 1969 [20 Aug., 1968], No. 41607/69. Heading C2C. Monoalkanolamines having from two to four carbon atoms in the molecule are continuously prepared by reacting an alkylene oxide having from two to four carbon atoms in the molecule with ammonia in the liquid phase in a molar ratio of NH 3 : alkylene oxide of between 10 : 1 and 80 : 1 at a temperature (of at least 120‹ C.) and pressure such that the reaction mixture remains substantially wholly in the liquid phase in the presence of a particulate cation exchange resin catalyst, continuously separating and recycling unreacted ammonia, and separating and recovering monoalkanolamine from the residual mixture of di- and trialkanolamines, which may also be isolated after separation of the monoalkanolamine. The process may be carried out adiabatically or isothermally and the reactants may be preheated and/or mixed shortly before the mixture is brought into contact with the catalyst. Suitable catalysts, preferably in the form of a fixed, or fluidized bed, are sulphonated polystyrene, sulphonated styrene/divinyl benzene copolymers, polymethacrylic acid or a polyacrylic acid, a phenol-formaldehyde polycondensate, or processed coal.</p> |
