Diffusion dialysis (DD) is an ion-exchange membrane (IEM) separation process driven by concentration gradient and has been applied for separation and recovery of acid/alkali waste solutions in a cost-effective and environmentally friendly manner.

Diffusion dialysis with ion-exchange membranes is mainly used today to recover acids or bases from a mixture with salts. The process is based on the fact that ion-exchange membranes generally show a high permeability for counterions while being more or less impermeable for co-ions. Exceptions are protons and hydroxide ions which can easily permeate both cation- and anion-exchange membranes. The transport mechanism in diffusion dialysis is more complex than in conventional dialysis due to the electrostatic interaction between positive and negative charges and the electroneutrality requirement。

 

 

 

Main technical indexes of diffusion dialysis CEM for alkali separation Diffusion dialysis CEM for alkali separation
Product type	TWDDC1 Standard	TWDDC2 High Flux
Thickness （mm）	0.25～0.28	0.15～0.25
Water content （%）	50～70	40～80
OH- Diffusion Coefficient （10-7m/s）	≥1	≥2
OH-/AlO2+ Separation factor	≥10	≥15
Applicqtion:alkali/salt separation in aluminum oxide,tungsten oxide,viscose fiber,etc.

 

Main technical indexes of  diffusion dialysis AEM for acid separation Diffusion dialysis AEM for acid separation
Product type	TWDDA1 Standard	TWDDA2 High Flux
Thickness （mm）	0.30～0.32	0.20～0.30
Water content （%）	40～70	20～50
H+ Diffusion Coefficient （10-7m/s）	≥5	≥5
H+/Fe2+ Separation factor	≥15	≥15
Applicqtion:acid/salt separation in wet metallurgy, Formed foll,steel processing and storage battery,etc.

 

 

 

GUOCHU TECHNOLOGY (Xiamen) Co., Ltd. is a high-tech enterprise focusing on membrane technology as the core technique, dedicating to the development of new purification technology, for the biological pharmaceutical, food and beverage, fermentation industry, deep processing of agricultural products, plant extraction, petroleum and petrochemical industry, water treatment, air cleaning, chemical industry and other industries to provide comprehensive filter service and purification solution to fit the personalized requirement from different customers. We are using our membrane technology, ion exchange, and liquid chromatography and other high-tech approaches to better serve our customers by integrating and improving their production line from upstream and downstream. We are dedicating to be a professional service provider to help you find the solutions to reduce investment outlay, save running cost, decrease resource consumption, improve product quality, clean manufacture environment, and upgrade industries.
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