PhD Theses (Chemical Engineering)

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Browsing PhD Theses (Chemical Engineering) by Subject "Adsorption"

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    Characterization of Mineral-Based Colloidal Microbubble and Its Subsequent Application in Separation of Fine Mineral Particles
    (2022) Ruby, Kumari
    Ionic Microbubbles are miniature gas bubbles of less than 100 μm in diameter, which are surrounded by charged ions. Fine bubbles are used in many environmental and industrial processes for solid-liquid separations. They have been used for treatment techniques, removal of pulp fiber, separation of fine particles, protein recovery, deinking of waste water, etc. The important characteristics of microbubbles are their large specific area and small buoyancy; therefore, effective dissolution of gas-phase and high adsorption rate is expected. Microbubbles are the type of bubbles, which consists of gas inside their core, they are separated from each other, so they cannot agglomerate, having a size range of micrometers, usually 1-100 micrometer. There is a lack of research to explore the characteristics of microbubbles in the presence and absence of micro-nano particles and their efficiency in removing them. This work aimed to examine the stability of microbubbles generated with surface-active agents with and without particles. The drainage kinetic study was done for the microbubbles generated in the presence of particles with and without salt for assessing the stability of the microbubble. The effects of some primary parameters on entrainment of particles of ZnO, Al2O3, etc., in a flotation column using microbubbles for enunciating the feasibility of the microparticle separation by microbubble.
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    Removal and Recovery of Surfactants by Foam Fractionation
    (2022) Kumar, Awadh Kishor
    Surfactants are used in many industries, and they are integrally related to many consumer products. However, at the same time, they contaminate water. The environmental fate of the surfactants is considerably important due to their effects on the health of human beings and animals. They are of interest because of their increasingly ubiquitous domestic and industrial use, and the difficulty in removing them by the traditional treatment methods. The removal of of different types of surfactant by foam fractionation has been practiced for water/wastewater treatment. This process and its applications in water/wastewater treatment have been discussed in the Chapter 1 of this thesis. Chapter 2 of this thesis focuses on the materials and experimental methods
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    Synthesis and Performance Evaluation of a Novel Natural Surfactant–Polymer Assembly for Enhanced Oil Recovery
    (2022) Machale, Jinesh Subhash
    A significant amount of oil (i.e., 60–70%) remains trapped in the reservoirs after the conventional primary and secondary methods of oil recovery. Enhanced oil recovery (EOR) is, therefore, necessary to recover the major fraction of unrecovered trapped oil from the reservoir to meet the present-day energy demands. The chemical method of EOR involves the injection of alkali, surfactant, polymer, and a combination of alkali–surfactant–polymer solution in the reservoir with the objective of achieving a reduction in interfacial tension and matching the mobility between oil and water for more recovery of oil. The success of this method depends on the effective synergy between the chemical additives.