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Removal of tylosin from its dilute aqueous solutions was studied applying the Rotating Filmpertraction technique. Non-toxic and practically water insoluble alcohols as n-octanol and n-decanol were used as intermediate, membrane liquid. A 0.001 mol/l solution of HCl was used as a stripping phase. Effects of temperature, feed phase pH-value and solute concentration on antibiotic distribution coef®cients were obtained for both systems. It was found that the ®rst two parameters have important effect, while the solute concentration in the studied range (0.02±0.1 g/l) did not modify these coef®cients. Results obtained show that the ®rst pertraction step ± solute extraction from the feed ± is a very fast process, while the second one ± the alcohol stripping ± is relatively slow, in particular when octanol was used as membrane phase. A mathematical model was proposed and used for evaluation of corresponding local mass transfer coef®cients. List of symbols a mass transfer area (m 2 ) K equilibrium constant (mol/m 3 ) k ®lm mass transfer coef®cient (m/s) m distribution coef®cient (±) j mass transfer¯uxes (mol/m 2 Á s) Ty tylosin in molecular form TyH tylosin in a protonised form t time (s) V phase volume (m 3 ) Superscript 0 initial value

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To cite this article: (2001) Methods of increasing efficiency of construction, service, and repair of oil and gas equipment and transmission pipelines using adaptive pulsed welding and surfacing technologies, Welding International, 15:10, 821-826,