Preparation of High Density Cellulose Membrane for Pressure Flux

1 Film Porosity Characteristics Effect of pulp DP Table 2 shows that the high DP of the pulp (experimental code A) results in higher porosity (lower density) and membrane permeability. It is well known that the molecular weight of a membrane polymer greatly influences the membrane properties, and the molecular weight depends on the degree of polymerization, which indicates the number of repeating units (monomers) in the chain molecule. Polymers with a high degree of polymerization will have longer chains and larger molecules than polymers with low degree of polymerization.

Most dialyzers use cellulose-based membranes. As a result of the use of these cellulose membranes, it is suitable to use "biocompatible membranes" they are coated with platelets and hence generally synthetically produced (Kooman, 1998, p. 156). "Cellulosic fibers are prepared by dissolving cellulose in sodium hydroxide, aging, treating with carbon disulfide, and adding an excess of sodium hydroxide" (Hoenich, 1995, p. 587). After this step, the cellulose is regenerated and extruded into an acid bath. The most commonly used movie is Cuprothan. The film was not immersed in sodium hydroxide solution but was prepared by "dissolving cellulose in ammonium hydroxide solution" (Hoenich, 1995, p. 588). "Cellobiose units form the basic structure of cellulose-based membranes; they consist of numerous anhydroglucose units joined together by 1 to 4, 1 to 6 b-glycosidic linkages (Hoenich, 1995).

There are three general membrane materials, namely polyamide film composite (TFC), cellulose acetate (CA) and cellulose triacetate (CTA). Typically, the TFC film is stronger and more durable in these three films. CA and CTA are more resistant to chlorine. The specified film is used for various purposes. Reverse osmosis can be used not only for desalination but also for the filtration of residential, commercial and industrial water. In this way, water can be cleaned by removing impurities in the water. These impurities include ions, volatile organic compounds (VOC), pesticides and salts. This is because these impurities are larger than the hole and can not pass through. Water molecules are small enough so please pass through the membrane. Impurities, but left behind the membrane