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US 7,683,216 B2Granted
Continuous process for the preparation of alkyleneimines
AssigneeBASF SE
InventorsThomas Knebel, Gerd Saas, Wolfgang Schreieck, Horst Schroeder, Manfred Winter
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Abstract
A process for the preparation of alkyleneimines by subjecting sulfuric acid monoesters of aminoalkanols to an at least two-stage reaction with aqueous bases at a temperature of at least 110° C. under pressure, relieving the pressure of the reaction mixture and distilling off the alkyleneimines from the reaction mixture after each reaction stage, wherein the conversion in the first stage is from 40 to 90% and that in the second stage is from more than 90% to 99.99%.
Claims19
A process for preparing at least one alkyleneimine, comprising:
- a first heating of a mixture comprising at least one sulfuric acid monoester of aminoalkanol and at least one aqueous base to a temperature of at least 100° C.;
- a first reacting of said at least one sulfuric acid monoester of aminoalkanol and said at least one aqueous base which is carried out at said temperature and at a pressure of at least 3 bar to form said at least one alkyleneimine;
- a first depressurizing of said mixture;
- a first separating of said at least one alkyleneimine from said mixture;
- a second reacting of said at least one sulfuric acid monoester of aminoalkanol and said at least one aqueous base at said temperature and at a pressure of at least 3 bar to form said at least one alkyleneimine;
- a second depressurizing of said mixture;
- and
- a second separating of said at least one alkyleneimine from said mixture, wherein
- i) said first heating is carried out for no longer than 25% of the total time of said first reacting,
- ii) from 40 to 90% of said at least one sulfuric acid monoester of aminoalkanol present in said mixture is converted to said at least one alkyleneimine during said first reacting;
- and
- iii) from 90 to 99.99% of said at least one sulfuric acid monoester of aminoalkanol present in said mixture is converted to said at least one alkyleneimine during said second reacting.
9 more elements
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