Method for producing alkanolamines
AssigneeBASF SE
InventorsMatthias Frauenkron, Ulrich Müller, Wolfgang Harder, Jörg Unger, Johann-Peter Melder, Anton Meier, Walter Himmel
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Abstract
At least one alkanolamine is prepared by reacting ammonia with alkylene oxide in a reaction space in the presence of a catalyst to give monoalkanolamine or dialkanolamine or trialkanolamine or a mixture of two or three of these compounds, the distribution of the various alkanolamines within the product spectrum being controlled by means of the temperature in the reaction space, by a process in which the temperature is established by regulating the temperature profile in the reaction space.
Claims13
A process for selectively preparing monoethanolamines by reacting ethylene oxide with ammonia in the presence of a catalyst in a tube reactor, wherein a feed gas stream containing ethylene oxide and ammonia is fed to the tube reactor and a product mixture (I) containing monoethanolamine, diethanolamine and triethanolamine is obtained, wherein the maximum temperature in the tube reactor is in the range of from 60 to 130° C. and said maximum temperature is from 0 to 30° C. above the temperature of the feed gas stream, wherein the reaction is carried out at a pressure of from 20 to 250 bar, wherein the molar ratio of ammonia to ethylene oxide in the feed gas stream is from 100:1 to 5:1.
A process for selectively preparing monoethanolamines, diethanolamines or triethanolamines through control of reaction conditions, comprising selectively preparing monoethanolamine by feeding a gas stream containing ethylene oxide and ammonia to a first stage of a tube reactor wherein a product mixture (I) containing monoethanolamine, diethanolamine and triethanolamine is obtained, wherein the maximum temperature in the tube reactor is in the range of from 60 to 130° C. and said maximum temperature is from 0 to 30° C. above the temperature of the feed gas stream, and optionally
- selectively preparing diethanolamines or triethanolamines by further reacting a whole or part of the monoethanolamine from the product mixture (I) with ethylene oxide in the presence of a catalyst in the tube reactor, wherein the feed gas stream containing monoethanolamine and ethylene oxide is fed to the tube reactor and a product mixture (II) containing diethanolamine and triethanolamine is obtained, wherein the maximum temperature in the tube reactor is in the range of from 60° C. to 140° C. in the second reaction stage.
A process arranged to provide an option for selectively preparing monoethanolamine or diethanolamine and triethanolamine comprising selectively preparing monoethanolamine by feeding a gas stream containing ethylene oxide and ammonia to a first stage of a tube reactor wherein a product mixture (I) containing monoethanolamine, diethanolamine and triethanolamine is obtained, wherein the maximum temperature in the tube reactor is in the range of from 60 to 130° C. and said maximum temperature is from 0 to 30° C. above the temperature of the feed gas stream, or optionally
- selectively preparing diethanolamines or triethanolamines in a second stage comprising separating monoethanolamine from the product mixture (I), and a whole or part of the monoethanolamine is reacted with ethylene oxide in the presence of a catalyst in a tube reactor in a second reaction stage, wherein the feed gas stream containing monoethanolamine and ethylene oxide is fed to the tube reactor and a product mixture (II) containing diethanolamine and triethanolamine is obtained, wherein the maximum temperature in the tube reactor is in the range of from 60° C. to 140° C. in the second reaction stage.
Dependencies are inferred from the claim text.