Distillation: processes – separatory – Distilling to separate or remove only water – From organic compound
Reexamination Certificate
2006-01-17
2006-01-17
Manoharan, Virginia (Department: 1764)
Distillation: processes, separatory
Distilling to separate or remove only water
From organic compound
C203S043000, C203S078000, C203S080000, C203S099000, C203SDIG001, C564S497000
Reexamination Certificate
active
06986833
ABSTRACT:
An amine-containing mixture containing one or more amines, water, low-boilers and optionally high-boilers is fractionated by a process having the steps (iii) and (iv) and optionally the steps (i), (ii) and (v):(i) a (first) low-boiler fraction is separated off from the amine-containing mixture by distillation,(ii) a (first) high-boiler fraction is separated off from the amine-containing mixture by distillation,(iii) the amine-containing mixture is extracted with sodium hydroxide solution, producing an aqueous, sodium-hydroxide-containing first phase and an aqueous-organic, amine-, (further) low-boiler- and possibly (further) high-boiler-containing second phase,(iv) the aqueous-organic second phase, is distilled, producing essentially anhydrous amine as bottom-phase take off or sidestream takeoff in the stripping part of the distillation column, an amine/water azeotrop as sidestream takeoff in the enrichment part of the column and a (further) low-boiler fraction as overhead takeoff, and recycling the amine/water azeotrop to the extraction step (iii),(v) the essentially anhydrous amine is further purified of fractionated.
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Alemany Aurelie
Rittinger Stefan
Rütter Heinz
Schmidt Willi
Wehinger Mark
BASF - Aktiengesellschaft
Manoharan Virginia
Novak Druce & Quigg
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