| 摘要 |
The foam in acid gas scrubbing solutions created during an acid gas (e.g. CO2) scrubbing process is reduced or eliminated by the addition of certain polyoxyethylene polyoxypropylene block copolymers as defoaming agents. The acid gas scrubbing composition comprises (a) an alkaline material comprising a basic alkali metal salt or an alkali metal hydroxide, (b) an activator for said alkaline material comprising at least one amine containing a hydrophobic moiety, (c) water and (d) at least one antifoaming agent comprising a polyoxyethylene polyoxypropylene block copolymer of the general formula: HO(C2H4O)a(C3H6O)b(C2H4O)cH wherein a and c are integers such that the hydrophilic portion represented by (C2H4O) constitutes from 10 to 30 weight percent of the block copolymer and b is an integer such that the hydrophobic portion represented by (C3H6O) has a molecular weight from 1000 to 2150. |
