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Analysis of chemical methods for determination of interfacial areas in gas-in-liquid dispersions with non-uniform bubble sizes

1980; Elsevier BV; Volume: 35; Issue: 10 Linguagem: Inglês

10.1016/0009-2509(80)85048-2

1873-4405

Adrian Schumpe, W.‐D. Deckwer,

Carbon Dioxide Capture Technologies

Comparison of literature data on effective interfacial areas from sulfite oxidation and CO2 absorption into alkali show considerable differences even for the same contactor. It is shown that the discrepancy results from the use of an overall conversion. Owing to the non-linear dependency of the conversion of the interfacial area and the non-uniformity of the τ/db-values of the bubbles this is not permitted. The deviation of achem from ageo is larger the broader the distribution of τ/db and the higher the Stanton numbers are. The error can however be kept low if area measurements by chemical methods are carried out at low conversions, i.e. the gas—liquid contactor should possibly be operated as differential reactor. For a difference of achem from ageo less than 15% the conversion in the smallest bubbles having largest τ/db-values should not exceed a value of about 0.4–0.8, the appropriate value depending on the reaction order. This presents a rather conservative guideline for efficient experimentation, however, it guarantees negligible difference of achem from ageo for most practical applications.