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A system that can be separated by membrane distillation process?


Release time:

2024-05-14

The core essence of membrane distillation is a high-efficiency single-stage low-temperature evaporation separation process. Therefore, this technology is very suitable for industrial scenarios with limited space and waste heat.

A system that can be separated by membrane distillation process?

The core essence of membrane distillation is a high-efficiency single-stage low-temperature evaporation separation process. Therefore, this technology is very suitable for industrial scenarios with limited space and waste heat.
Membrane distillation technology can be applied in many scenarios, including:
1、Concentration of salt-containing solutions, such as seawater, brackish water, industrial brine, etc.;

2、Acid and alkali concentration, such as sulfuric acid, phosphoric acid, sodium hydroxide, sodium acetate and other industrial raw materials; Concentration of aqueous solutions

3、containing non-volatile or semi-volatile organic compounds, such as formaldehyde, tetrahydrofuran, ethanol, isopropyl alcohol, etc.;

Seawater concentration:When seawater is concentrated to 28% salt content through membrane distillation equipment, water can still be produced well. However, when salt frost occurs in concentrated seawater, the membrane distillation water production will be greatly reduced until it cannot be circulated.

Phosphoric acid concentration:As the concentration of phosphoric acid increases, the partial pressure of water vapor will decrease significantly, making evaporation difficult. The membrane distillation process can provide an evaporation interface with a high specific surface area to compensate for the decrease in evaporation capacity. Phosphoric acid can be effectively concentrated to about 85% or even higher through the membrane distillation process.

Formaldehyde concentration: Formaldehyde is the core raw material for preparing polyformaldehyde. Formaldehyde is concentrated to about 60% to synthesize polyformaldehyde. The concentration process is basically completed by evaporation. In the low-concentration concentration process, pressurized distillation can be used to concentrate formaldehyde to about 40%. Concentration of higher concentrations requires the use of vacuum distillation mode, and membrane distillation plays an important role here. In the membrane distillation process, the steam side can be pumped to -96kPa, which can achieve efficient concentration of high-concentration formaldehyde and avoid the use of huge and long-process distillation tower equipment.