Characterisation of Inorganic Composite Ceramic Membrane for Lactic Acid Esterification Processes

摘要

The use of inorganic composite membranes in chemical industries has received a lot of attention more recently due to a number of exceptional advantages including thermal stability and robustness. Inorganic membranes can selectively remove water from the reaction mixture during esterification reactions in order to enhance product formation. The characterisation of inorganic composite membranes used in this work including the determination of the pore diameter and specific surface area was performed using Liquid Nitrogen adsorption at 77 K. The membrane was modified once. The permeation test for the single gases including carbon dioxide (CO_2), helium (He), nitrogen (N_2) and argon (Ar) through the inorganic composite ceramic membrane was carried out at the gauge pressure range of 0.10 - 1.00 bar and at the temperature of 393 K. The order of the gas molecular weight was He < N_2 < CO_2 < Ar. The BET surface area of the dip-coated silica membrane showed a type IV isotherm characteristic of mesoporous structure with hysteresis. The BJH curve of the silica-membrane was in accordance with mesoporous classification.