Absorbent solution based on N, N, N′, N′-tetramethylhexane-1,6-diamine and on a particular amine comprising primary or secondary amine functions and method for removing acid compounds from a gaseous effluent

摘要

Acid compounds are removed from a gaseous effluent in an absorption method using an aqueous solution of N,N,N′,N′-tetramethylhexane-1,6-diamine formulated with a particular primary or secondary amine, allowing to obtain a single-phase absorbent solution under the absorption conditions of acid gases such as CO2.;The method is advantageously applied to the treatment of natural gas and of gas of industrial origin.

主权项

1. A method for removing the acid compounds contained in a gaseous effluent, comprising:
carrying out an acid compound absorption stage comprising contacting the effluent with an absorbent solution comprising water and at least one amine of formula (I) (N,N,N′,N′-tetramethylhexane-1,6-diamine) and controlling a demixing phenomenon of the absorbent solution by adding at least one activating compound selected from the group consisting of ButylAmine, N-Butylpiperazine and a primary or secondary amine meeting formula (II), formula (II) being: wherein n=1 or 2, and each group R1, R2, R3, R4, R5, R6, R7 and R is selected independently among one of the elements selected from the group consisting of: a hydrogen atom, and an alkyl group with 1 to 2 carbon atoms, group R is not linked to any one of groups R1 to R7, and group R is linked by R3 or R7 to the aromatic ring of formula (II) so as to form a heterocycle with 5 to 6 atoms, so as to obtain a gaseous effluent depleted in acid compounds and a single-phase absorbent solution laden with acid compounds in an absorption column, and then carrying out a regeneration stage comprising sending at least part of the solution laden with acid compounds to a distillation column in order to release the acid compounds in form of a gaseous effluent and to obtain a regenerated absorbent solution.