Porous Glass Tube Research Articles

ChemInform Abstract: A Palladium/Porous‐Glass Composite Membrane for Hydrogen Separation.

Palladium was deposited on a porous-glass tube using a technique of electroless-plating. This composite membrane exhibited a remarkable permeability to hydrogen. Moreover, hydrogen was selectively separated from H2–N2 and H2–CO gas mixtures through the composite membrane.

A Palladium/Porous-Glass Composite Membrane for Hydrogen Separation

Abstract Palladium was deposited on a porous-glass tube using a technique of electroless-plating. This composite membrane exhibited a remarkable permeability to hydrogen. Moreover, hydrogen was selectively separated from H2–N2 and H2–CO gas mixtures through the composite membrane.

Separation of HT and HTO in the atmosphere with porous Vycor glass tube

The continuous selective monitoring of tritium gas (HT) in the air containing HT and tritiated water vapor (HTO) was investigated by using the separation cell made of porous Vycor glass tube. On admitting the air containing HT or HTO into the separation cell, HT permeated immediately through the Vycor tube depending on the partial pressure, however, HTO permeated very slowly through the Vycor tube after initial induction period. The initial induction period was elongated with a rise of the temperature of separation cell and then the permeability of HTO decreased remarkably. In the air containing HT and water vapor, the permeation of HT through the Vycor tube was considerably restricted by the water vapor adsorbed on the Vycor tube at lower temperature (at 25 degrees C) but it was hardly affected by water vapor at higher temperature (greater than 50 degrees C) since water vapor was difficult to adsorb on the Vycor tube. These results indicated that HT in the air containing HT and water vapor can be continuously monitored by using the separation cell made of the porous Vycor glass tube.

Desalination using porous glass tube coated with thin cellulose acetate.

Desalination using porous glass tube coated with thin cellulose acetate.

Preparation of reverse osmosis membranes by plasma polymerization of organic compounds

The plasma polymerization of organic compounds was used to prepare a composite reverse osmosis membrane which consists of an ultrathin semipermeable membrane formed by plasma polymerization of an organic compound or compounds and a porous substrate. Many nitrogen-containing compounds (aromatic amines, heteroaromatic compounds, aliphatic amines, and nitriles) were found to yield excellent reverse osmosis membranes by plasma polymerization directly onto porous substrates such as Millipore filters, porous polysulfone filters, and porous glass tubes. Factors involved in the preparation of reverse osmosis membranes by plasma polymerization were investigated and discussed. The plasma polymerized membranes have the following unique features: (1) very stable performance independent of salt concentration and applied pressure (practically no water flux decline was observed with many membranes): (2) salt rejection and water flux both increase with time in the initial stage of reverse osmosis (consequently, the performance of the membrane improves with time of operation); (3) very high salt rejection (over 99%) with high water flux (up to 38 gfd) can be obtained with 3.5% NaCl at 1500 psi (membranes perform equally well under conditions of sea water conversion and brakish water treatment).