Patent ID: 6566556
Filing Date: 2003-05-20
Classification: B01J,C01C,C07C

Abstract:
A method for producing alkanolamines, which comprises:producing a product solution from liquid ammonia and an alkylene oxide using a solid catalyst in a reactor, wherein said solution comprises alkanolamines and unreacted ammonia; forwarding the product solution to an ammonia-recovering column disposed downstream of the reactor; recovering not less than 60% by weight of the unreacted ammonia, based on the weight of the product solution exiting from the outlet of the reactor, as liquid ammonia and a bottom product of the ammonia-recovering column; directing the bottom product to an ammonia-stripping column in which the ammonia is stripped out; leading the stripped ammonia to an ammonia absorption column in which the ammonia is absorbed by means of water, thereby recovering it as an aqueous ammonia solution.