METHOD OF REMOVING ORGANIC AMINES FROM HYDROCARBON STREAMS Russian patent published in 2016 - IPC C07C7/152 C07C11/02 C07C211/03 C07C209/82 

FIELD: chemistry.

SUBSTANCE: present invention relates to an improved method of removing organic amine from liquid hydrocarbon stream containing amine, having a boiling point higher than 100 °C, which is liquid at room temperature and normal pressure. Invention can be used in processes, in which a crude stream or product flow contains hydrocarbons and amines. Method includes the following steps: a) adding water to hydrocarbon stream containing an amine in an amount of 5-70 wt% with respect to total amount of hydrocarbon stream, b) bubbling carbon dioxide through hydrocarbon stream containing an amine at temperature 30-80 °C, and c) separating formed solid phase containing amine from liquid phase by filtration and optionally, extraction of amine from solid phase by heating in water or aqueous solution. Preferably hydrocarbon stream, containing an amine, selected from 2-ethylhexylamine and/or n-dodecylamine, is output stream from reactor for producing linear alpha-olefins (LAO) or fraction of said output flow. Water is added in amount of 15-60 %, more preferably 25-50 % in relation to total amount of hydrocarbon stream, bubbling is performed for 5-60 min, preferably 10-50 minutes, more preferably 20-40 minutes. Volume rate of carbon dioxide is in range of 50 to 150 cm³/min, depending on total amount of a mixture of liquid hydrocarbons in reactor. Added water is usually at least once partially replaced with fresh water during bubbling of carbon dioxide in temperature range 50-80 °C through hydrocarbon stream.

EFFECT: method simplifies process, since it simplifies extraction of amines due to formation of a solid gel-like phase, which is insoluble in organic or aqueous phase; wherein method does not require additional means for extracting and amines easily react.

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