Morphological properties and chemical and mechanical stabilities are some of the key features to be finely controlled to design membrane materials with outstanding properties. The present chapter deals with a process of manufacturing porous ceramic capillary tubes by extrusion technique using a mixture of clay and alumina with a view to reduce the sintering temperature for preparation of low-cost ceramic membranes. After formulating different ceramic pastes using clay-alumina mixtures and organic additives, the paste viscosity was determined to identify the optimum conditions for extrusion of capillary tubes using single screw extrusion machine. Subsequently, green capillary tubes were extruded, dried under controlled conditions, and sintered in the range of 1200–1450 °C in order to study the pores’ structure and related permeability characteristics. Alumina capillary membranes were also prepared at lower temperature using boehmite as binder. This study revealed the compositions used to formulate ceramic pastes as well as the fabrication process developed to prepare porous capillary tubes suitable for the elaboration of ultrafiltration (UF) membranes. Hence, it demonstrates the feasibility of developing ceramic hydrophobic membranes for implementation in membrane distillation.

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Fabrication of Low-Cost Ceramic Capillary Membranes and Their Applications

  • Sophie Cerneaux,
  • Sandeep Sarkar,
  • Sibdas Bandyopadhyay

摘要

Morphological properties and chemical and mechanical stabilities are some of the key features to be finely controlled to design membrane materials with outstanding properties. The present chapter deals with a process of manufacturing porous ceramic capillary tubes by extrusion technique using a mixture of clay and alumina with a view to reduce the sintering temperature for preparation of low-cost ceramic membranes. After formulating different ceramic pastes using clay-alumina mixtures and organic additives, the paste viscosity was determined to identify the optimum conditions for extrusion of capillary tubes using single screw extrusion machine. Subsequently, green capillary tubes were extruded, dried under controlled conditions, and sintered in the range of 1200–1450 °C in order to study the pores’ structure and related permeability characteristics. Alumina capillary membranes were also prepared at lower temperature using boehmite as binder. This study revealed the compositions used to formulate ceramic pastes as well as the fabrication process developed to prepare porous capillary tubes suitable for the elaboration of ultrafiltration (UF) membranes. Hence, it demonstrates the feasibility of developing ceramic hydrophobic membranes for implementation in membrane distillation.