Alkylamino alkyloxy (alcohol) monoalkyl ether for acid gas scrubbing process
An acid gas absorbent comprising an alkylamino alkyloxy (alcohol) monoalkyl ether and a process for the selective removal Of H 2 S from gaseous mixtures containing H 2 S and CO 2 using an absorbent solution comprising an alkylamino alkyloxy alcohol monoalkyl ether.
1. A method for producing absorbent materials of the formula
by catalytically reacting an alkyloxy alcohol of the formula
with an alkyl amine of the formula
wherein
x is 2, 3 or 4;
y is 1, 2, 3, 4, or 5;
R 1 is C 1 -C 9 alkyl, C 3 -C 9 branch alkyl, C 5 -C 9 cycloalkyl, C 6 -C 10 aryl, alkylaryl, or aryl alkyl;
R 2 is a C 3 -C 9 straight or branched alkyl wherein N is attached to R 2 through a second or tertiary carbon atom of R 2 ;
R 5 is hydrogen, or C 1 -C 6 alklyl;
R 3 is hydrogen or C 2 -C 5 alkyl.
2. The process of claim 1 wherein
R 1 is C 1 -C 4 alkyl, or C 3 -C 4 branched alkyl,
R 2 is C 3 -C 6 straight or branched alkyl,
R 5 is hydrogen or C 1 -C 4 alkyl.
3. The process of claim 1 wherein x is 2 and y is 1 or 2.
4. The process of claim 2 wherein x is 2 and y is 1, or 2.
5. The process of claim 3 wherein R 3 is hydrogen and R 2 is a C 4 -tertiary alkyl wherein N is attached to R 2 through the tertiary carbon atom of R 2 .
6. The process of claim 1 wherein the catalyst comprises a catalytically active metal on a support the metal loaded catalyst characterized by having a BET surface area in the range of about 50 to about 1200 m 2 /g, the support characterized by a micropore volume above about 0.05 cm 3 /g, the metal loaded catalyst exhibiting a pore size distribution when normalized for pores of 19.99 nm or less of about 30% or more pores of up to 4.99 nm and the pores of 5 to up to 19.99 nm constituting the balance.
7. An absorbent for the selective removal of H2S from a gaseous mixture containing H2S, CO2 and gaseous non-acidic components, the absorbent comprising a material of the formula
wherein: x, y, R 1 , R 2 , R 3 and R 5 are as defined in claim 1 .
8. The absorbent of claim 7 wherein
R 1 is C 1 -C 4 alkyl, or C 3 -C 4 branched alkyl,
R 2 is C 3 -C 6 straight or branched alkyl,
R 5 is hydrogen or C 1 -C 4 alkyl.
9. The absorbent of claim 7 wherein x is 2 and y is 1 or 2.
10. The absorbent of claim 8 wherein x is 2 and y is 1, or 2.
11. The absorbent of claim 7 wherein R 3 is hydrogen and R 2 is a C 4 -tertiary alkyl wherein N is attached to R 2 through the tertiary carbon atom of R 2 .
12. A process for the selective removal of H 2 S from a normally gaseous mixture containing H 2 S and CO 2 and gaseous non-acidic components by contacting said mixture with an absorbent solution comprising an absorbent material of the formula
where x, y, R 1 , R 2 , R 3 and R 5 are as defined in claim 1 under conditions whereby the H 2 S is selectively absorbed from the mixture.
13. The process of claim 12 wherein
R 1 is C 1 -C 4 alkyl, C 3 -C 4 branched alkyl,
R 2 is C 3 -C 6 straight or branched alkyl,
R 5 is hydrogen or C 1 -C 4 alkyl.
14. The process of claim 13 wherein x is 2 and y is 1 or 2.
15. The process of claim 13 wherein x is 2 and y is 1, 2, or 3.
16. The process of claim 1 wherein when x is 2 and y is 1, 2, or 3.
17. The process of claim 1 in which the alkoxy alcohol is methoxytriethylene glycol and the alkylamine is tert.-butylamine.