Membrane Distillation Module

General Information

Membrane distillation module is a module for membrane distillation, which is a thermally driven transport process that uses hydrophobic membranes for separation.
Membrane distillation module is made of high-performance hydrophobic hollow fiber membranes.
The working principle of membrane distillation:
First, the feed liquid is heated to a certain temperature by using factory waste heat or steam, and then pumped into the membrane distillation module through the raw material pump. Membrane distillation modules are potted with hollow fiber microporous hydrophobic membranes. The hollow fiber membranes have a large number of micropore. At high temperatures, the feed liquid generates a vapor pressure difference on two sides of the membrane. A large number of micropore can allow the evaporated water vapor to pass through the membrane pores, enter the other side of the membrane hollow fibers, and use the vacuum system to pump it out. After a large amount of water vapor volatilizes, the feed liquid is concentrated. The volatilized steam uses the heat pump to recover heat and returns to reheat the feed liquid to reduce the energy consumption of the entire system.

Features

Super hydrophobic membrane
High tolerance to acid and alkali
Uniform pore sizes
Multiple options for dimensions and membrane areas

Advantages

Applicable for critical applications
High separation efficiency
Adapt to different scale projects

Applications

Seawater desalination
Wastewater zero discharge
Acid alkali concentration
Concentration or purification crystallization of saline solution
Concentration of aqueous solutions containing non-volatile or semi-volatile organic compounds

Notice:

1. When the liquid temperature is 85°C, the safe internal and external pressure difference of the membrane hollow fibers should be less than 0.08 MPa, and the maximum pressure difference should not be greater than 0.1 MPa.
2. When used for the concentration of different materials, the feed liquid shouldn’t contain organic solvents such as alcohols, esters, hydrocarbons, ethers, oils, etc., otherwise the service life of hollow fibers will be shorter and leakage may happen.
3. A certain flow rate is required when the feed liquid flow over the outer surface of the membrane hollow fibers. Please adjust the flow rate according to the actual conditions such as the viscosity, temperature, and crystallinity of particles of the feed liquid to prevent crystallization or high surface concentration of the membrane hollow fibers from evaporation decrease.

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