METHOD OF PREVENTING FOAM FORMATION IN ALKALINE ABSORPTION SOLUTIONS Russian patent published in 1998 - IPC

FIELD: chemical engineering. SUBSTANCE: invention relates to removing acid components (CO₂, H₂S and others) by alkaline solutions involving foam suppressers added to those solutions. Foam suppressers are mainly used in the form of composite reagents. As a result, foam suppression process in hot alkaline absorption solutions is rendered less expensive, while simultaneously foam-suppression ability and long-term stability of compositionally simple foam suppressor are increased. In particular, polyethylsiloxane liquid is used with silicon content 26-28 wt % and containing 0.1 to 0.25 wt % ethoxyl groups. Liquid is added to alkaline absorption solution with pH 9-011 in amount 0.33-0.66 g/cu.dm at solution temperature 20 C or 0.06-0.1 f/cu. dm at solution temperature 120 C. EFFECT: reduced process expenses. 3 cl, 1 dwg, 3 tbl