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US 2024/0343674 A1Published application
Obtaining Aliphatic Amines from Compositions
AssigneeGenomatica, Inc.
InventorsMichael Merkel, Mathias LEIMBRINK, Friedhelm STEFFENS
Life of this patent
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Abstract
The invention relates to a method for obtaining an amine from a composition by means of distillation and a composition obtainable by that method. The invention also relates to a method for the production of an isocyanate from the composition obtainable.
Claims20
A method for producing an amine comprising the steps of:
- a) providing a composition comprising the amine, at least one compound having a lower boiling point than the amine and at least one other compound having a higher boiling point than the amine,
- b) distilling the composition in a thermally integrated distillation apparatus comprising a first distillation column, an evaporator-condenser with an evaporation space and a condensing space and a second distillation column, wherein
- the composition of step a) is introduced as feed into the first distillation column operating at a head pressure in the range from 1 to 23 bar (a),
- a bottoms liquid depleted in the lower boiling compound from the first distillation column is introduced into the evaporation space of the evaporator-condenser, is partially evaporated and is then separated into a gaseous feed, which is introduced into the second distillation column, and a residual stream residual stream,
- the second distillation column is operating at a head pressure between 0.05 to 3.8 bar (a) and at least 0.5 bar which is at least 0.5 lower than the head pressure in the first distillation column,
- a first stream of vapours from the first distillation column is introduced into the condensing space of the evaporator-condenser, is at least partially condensed there so that a condensate forms and the condensation heat is used to evaporate the bottoms liquid of the first column in the evaporation space of the evaporator-condenser partially, and
- a product stream including the amine is removed as a side stream below the feed or as a bottoms product from the second column.
4 more elements
A method for producing an amine comprising the steps of:
- a) providing a composition comprising the amine, at least one compound having a lower boiling point than the amine and at least one other compound having a higher boiling point than the amine,
- b) distilling the composition in a thermally integrated distillation apparatus comprising a first distillation column, an evaporator-condenser with an evaporation space and a condensing space and a second distillation column, wherein
- the composition of step a) is introduced as feed into the first distillation column operating at a head pressure in the range from 1 to 23 bar (a),
- the bottoms liquid from the first distillation column depleted in the lower boiling compound is introduced as feed into the second distillation column which is operating at a head pressure in the range from 0.05 and 1.5 bar (a) which is at least 0.5 bar below the head pressure in the first distillation column,
- a liquid stream is removed from the bottoms of the second distillation column and is introduced completely or partially into the evaporation space of the evaporator-condenser, is partially evaporated therein thus generating steam which is at least partially fed back into the column,
- a liquid residual stream which may optionally comprise solids is removed and discharged from the evaporation space of the evaporator-condenser, from the bottom of the column or as part of the bottoms liquid removed there,
- a steam stream from the first distillation column is introduced into the condensing space of the evaporator-condenser, and is at least partially condensed therein, thus forming a condensate, and the condensation heat is used to partially evaporate the liquid stream removed from the bottoms of the column, and
- a product stream including the amine is removed either as a partial stream from the steam produced in the evaporation space of the evaporator-condenser or is removed below the feed as a side stream from the second distillation column.
5 more elements
Dependencies are inferred from the claim text.