Construction element for CO
A construction element for a plant for capture of an acidic gas using an aqueous amine absorbent, wherein at least a part of a surface of said element comprises a polyolefin, and a hydrolytically stable antioxidant, is described. Additionally, a liner comprising said polyolefin and the hydrolytically stable antioxidant, is described. The construction element may be a column, a pipe, an insert, like a column packing element or a tray. An apparatus for capturing CO 2 using the construction elements, is also described.
1. A construction element for a plant for capture of an acidic gas using an aqueous amine absorbent, wherein at least a part of a surface of said construction element comprises a polypropylene composition;
wherein the polypropylene composition comprises:
a hydrolytically stable antioxidant stable in amine solutions, of formula
1,3,5-tri-methyl-2,4,6-tris-(3,5-di-tert. butyl-4-hydroxyphenyl) benzene; and
a heat stable antioxidant of formula (IIIb)
wherein
R 1 is C 1-18 alkyl, C 5-12 cycloalkyl, phenyl or C 7-9 phenylalkyl;
R 2 is hydrogen, C 1-18 alkyl, C 5-12 cycloalkyl, phenyl or C 7-9 phenylalkyl;
R 3 is hydrogen or methyl;
n is 0 or an integer from 1 to 6; and
p is an integer from 2 to 6.
2. The construction element as claimed in claim 1 , wherein said heat stable antioxidant is
3. The construction element as claimed in claim 1 , further comprising one or more of an organic phosphite or phosphonite antioxidant, and/or a sulphoether antioxidant.
4. The construction element as claimed in claim 1 , wherein the propylene polymer comprises a beta-crystalline phase.
5. The construction element as claimed in claim 1 , further comprising synthetic hydrotalcite.
6. The construction element as claimed in claim 1 , wherein said construction element is constructed of concrete, metal or composite material.
7. The construction element as claimed in claim 1 , wherein the surface thereof expected to being exposed to the aqueous amine absorbent, amine vapour and/or steam is coated with said polypropylene composition.
8. The construction element as claimed in claim 1 , wherein the surface thereof expected to being exposed to aqueous amine solution, vapour thereof or steam is a liner comprising said polypropylene composition which is fixed to the surface of the construction element.
9. The construction element as claimed in claim 1 , wherein the construction element is an absorption column, a desorption column, a tube, a liner, a tray, or a column packing element.
10. A liner for a construction element, the liner comprising a polypropylene composition comprising a hydrolytically stable antioxidant stable in amine solutions, of formula
1,3,5-tri-methyl-2,4,6-tris-(3,5-di-tert. butyl-4-hydroxyphenyl) benzene; and
a heat stable antioxidant of formula (IIIb)
wherein
R 1 is C 1-18 alkyl, C 5-12 cycloalkyl, phenyl or C 7-9 phenylalkyl;
R 2 is hydrogen, C 1-18 alkyl, C 5-12 cycloalkyl, phenyl or C 7-9 phenylalkyl;
R 3 is hydrogen or methyl;
n is 0 or an integer from 1 to 6; and
p is an integer from 2 to 6.
11. The liner as claimed in claim 10 having a thickness of 0.5 to 100 mm.
12. A method for capturing an acidic gas in an exhaust gas comprising: contacting said exhaust gas with an aqueous amine absorbent in an absorption column according to claim 9 .
13. An apparatus for capturing acidic gas, wherein said apparatus comprises a construction element as claimed in claim 1 .