Abstract
Experimental studies on the effects of surface active agents on the hydrodynamics and masstransfer performance of a 700 dm 3 pilot-plant external loop airlift reactor have been conducted. The effects of the addition of a silicone polymer antifoam agent on foaming caused by the viscous non-Newtonian solutions of xanthan gum and carboxymethyl cellulose were examined. In general, the addition of the antifoam led to significant reductions in all design parameters, i.e., gas holdup, liquid circulation velocities, and volumetric mass-transfer coefficients relative to the values determined for the air-water system. Presented in this paper are new correlations for riser gas holdup (r) and volumetric mass-transfer coefficient (kla) with effective viscosity ( eff) based on shear rate determined in this reactor. Also, it was found and/or confirmed that the geometric parameter Ad/Ar and Vsg had the most effect on the nonadjustable parameters such as riser and downcomer gas holdup, superficial liquid velocity, and specific interfacial area. The disengagement section design has a profound effect on the rate of foaming.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
