Classification of membranes (1)

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According to the different physical forms of the separation membrane section, it can be divided into symmetric membrane, asymmetric membrane, composite membrane, flat membrane, tubular membrane, hollow fiber membrane and so on

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Different membrane separation processes have different requirements for membrane materials

Figure 10-1 The basic types of membranes

Table 10-1 Classification of membrane materials

Cellulose is the most abundant natural polymer.

Polysulfone is a kind of temperature-resistant and high-strength engineering plastic with excellent creep resistance.

Polyamides mainly include aliphatic polyamides (RO membranes, supporting substrates for gas membranes and microfiltration membranes), polysulfone amides (ultrafiltration membranes and microfiltration membrane materials), and aromatic polyamides (the second generation of RO membranes) , Cross-linked aromatic polyamide (RO film); polyimide is a class of high-strength, high-performance materials that are resistant to high temperature, solvents, and chemicals

Polyester resin has high strength, good dimensional stability, excellent heat resistance, solvent resistance and chemical resistance, and is widely used as a support and reinforcement material for separation membranes