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Ion Exchange Membranes

Membrane Types

 

 

PCA produces different types of homogenous ion exchange membranes in its facility in the Saarland. The membrane types are developed and designed for different applications.
As all of these membranes are homogeneous, their thickness is pretty low and the PCCell spacers are developed to build very seal stacks. Thermal pretreatment of freshly assembled stacks is not regularly necessary.

Standard ion exchange membranes

Ion Exchange Membranes

PCA produces a series of standard anion and cation exchange membranes (PC-SK and PC-SA) useful in general desalination applications by electrodialysis. In addition, there are two series of special anion exchange membranes by modification of the selectivity profile of those membranes or by modification of shape (reinforced, non reinforced, extra thin etc):


 

 


 

Membranes for the treatment of mineral acids

PC Acid 60 for the production of hydrochloric acid from sodium chloride or for the concentration of diluted nitric acid

PC Acid 100 for the concentration of diluted sulfuric acid

Many industrial processes produce dilute acid streams which have to be deposited because of their low concentration. Acid-ED leads to a reconcentrated acid product of a concentration level useful for recycling it in the same process. An example is the reconcentration of a pickling acid out of a rinsing water.

If mineral acids are to be produced from their salts by electrolysis or electrodialysis with bipolar membranes , high current efficiencies are necessary. Acidblocker anion exchange membranes developed at PCA provide this characteristic due to a minimized proton leakage. The loss of product over the acidblocker anion exchange membrane is minimized.

Membranes for the production of organic acids

In the liberation of a wide variety of organic acids out of their salts, the voltage drop across the anion exchange membrane gives a considerable part to the energy consumption of the process. This electrochemical processing technology enables the processing of acids like acetic acid, citric acid, gluconic acid, lactobionic acid etc., which are produced by fermentation or by chemical processes.

PCA has developed membranes for the treatment of organic acids with a low electric resistance:

PC 100 D for small anions with a mass of about 100 dalton

E.g. for lactic acid recovery from a fermentation broth with high glucose rejection (Y. H. Kim, S.-H. Moon J. Chem. Technol. Biotechnol. 2001, 76(2),169-178) by means of a water splitting electrodialysis process.

PC 200 D for medium anions with a mass of about 200 dalton

The type of membranes used and the process conditions choosen are determined by the requirements of application. For more information about typical applications of the different types of membranes please confer our overview (DE) .
When choosing the membrane type, the chemical and physical properties of the membranes listed below have to be taken into account.
PCA offers support at all stages of process realization from the first application screening through to the engineering and planning of the plant to you.

 

Data Sheets

 

See Technical Specifications: Technical Datasheet PCA membranes

 

Available Sizes and Qualities

 

Membranes are available in the following sizes:

 

standard sizes: 250 x 250 mm 0.82 x 0.82 ft
  500 x 500 mm 1.64 x 1.64 ft
  1000 x 500 mm 3.29 x 1.64 ft
other sizes: on request email
maximum size 500 mm in width
1350 mm in length
 

The membrane types can be ordered in qualities differing in the reinforcement used:

  • Standard reinforcement system: Polyester fabric

  • Alternative reinforcement fabrics: Polyamide, PEEK (only available for some types)

     

     

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