Polymer separation membrane is a semi permeable thin film made of polymer materials with selective permeation function. The use of such semi permeable films, driven by pressure difference, temperature gradient, concentration gradient or potential difference, enables separation technologies such as gas mixtures, liquid mixtures or solutions of organic and inorganic substances to have energy-saving, efficient and clean characteristics, and is therefore considered a major technology supporting the new technological revolution. The membrane separation process mainly includes reverse osmosis, ultrafiltration, microfiltration, electrodialysis, pressure dialysis, gas separation, pervaporation, and liquid membrane separation. Used for preparing separation, pervaporation, and liquid membrane separation. There are many types of polymer materials used to prepare separation membranes. The most commonly used materials now are polypropylene, polyolefin, cellulose lipids, and organosilicon. There are also various forms of membranes, generally using flat membranes and aerial fibers. Promoting the application of polymer separation membranes can achieve significant economic and social benefits. For example, using ion exchange membranes to electrolyze salt can reduce pollution and save energy: using reverse osmosis for seawater desalination and desalination consumes less energy than other methods; The use of gas separation membranes to enrich oxygen from the air can greatly improve oxygen recovery rates.
