Desorption of CO2by steam bubbles from amine-promoted potash solutions

✍ Scribed by V.V. Mahajani; P.V. Danckwerts

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 55 KB
• Volume: 38
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(83)80177-8

✦ Synopsis

Desorption of CO2 by steam bubbles from amine-prnated potash solutions

We have recently described (1) some experiments in which the rate of dasorprion of CO2 per unit eree of interface was measured, using potash solutions with end without the addition of small amounts of alkanolemines. The present camunication concerns experiments in which steem was bubbled through 100 cm3 of the carbonated liquor, and no attempt was made to control the interfreial mea.

The experimental procedure was very similar to that described in ref. (l), except that the stripping gas was steam generated at etcmospheric ptessure (without nitrogen) end was bubbled through the potash solutions, which waa kept at 1OloC and atmospheric pressure.

The emergent vepour was passed through a packed ebsorptim column in which the CO2 we8 absorbed in a solution of NaOH.

This was subsequently acidified and the equivalent partial pressure of CO2 in the liquid determined with a Radiometer P electrode. =o2

In view of the fact that the actual area of the interface between liquid and gas wee not known, and certainly varied a8 between one experiment and another, no very fine quantitative conclusions can be drawn.

nowever, the Table shows-that MEA. DEA and TEA all increase the rate of desorption compared to that from unpromoted potash solution to about the same extent. When the interfacial area is fixed the magnitudes of the promotion effect are DEA>HEA>TEA (indeed TEA has very little promoting power).