Membrane Filtration within the Chemical Industry
Membrane technology has made major progress in recent years and is nowadays the method of choice for many processes in the chemical industry, wherever substances are to be separated efficiently and gently.
A prime example of this is dia-filtration, in which solutes and particles with higher molecular weights are retained while solutes with lower molecular weights are "washed" out of the process fluid.
Membrane technology and membrane filtration for the Chemical Industry
With a broad choice of microfiltration membranes (MF), ultrafiltration membranes (UF) and nanofiltration membranes (NF), a wide range of molecular weight cut-offs are available. MICRODYN-NADIR offers a wide product portfolio, which is comprised of flat membranes, formats, spiral wound modules, hollow fiber modules and tubular membrane modules. Our membranes have been developed based on different polymers, such as Polypropylene (PP), Polyethylene (PE), Polyethersulfone (PES), Polyacrylonitrile (PAN), Polystrene (PS), Polyvinylidene fluorid (PVDF) and Regenerate Cellulose (RC).
Chemically resistant membranes for filtration challenges in the Chemical Industry
Membrane filtration represents one of the best technologies available for production processes in the chemical industry. Not only does it serve as a so-called end-of-pipe procedure, but it can also play a role in process intensification. For instance, in heterogeneous reactions membranes are used to separate the product and reagent, for catalyst recirculation or concentration for reuse. Chemical resistance often plays a decisive role when selecting a suitable membrane or module. MICRODYN-NADIR possesses substantial experience regarding the correct selection of membrane and module materials. The high chemical and mechanical resistance of the materials used ensures effective cleaning and stable filtration performance.
Diafiltration is a widely-used process within the chemical industry for separating salts, acids and bases from aqueous reaction mixtures or washing suspensions. A typical application is desalting and concentration of reactive dyestuffs and optical brighteners.
This procedure requires the membrane and module to demonstrate very high stability to variations in pH and temperature, excellent resistance to abrasion and high flow and retention rates.
Permanently hydrophilic membranes for high fluxes and reliable retention
MICRODYN-NADIR modules have excelled in these applications due to their high stability and long life times. The permanently hydrophilic properties of these membranes enable high fluxes and retention rates, even at low molecular weight cut-offs.
MICRODYN-NADIR offers SPIRA-CEL® spiral wound modules that are temperature stable up to
80 °C. This eliminates the need for excessive cooling of reaction mixtures which simplifies the entire process. The modules can be fine-tuned to the process demands by choosing the right combination of different membrane and spacer types to achieve maximum efficiency.
Applications for membrane technology within the Chemical Industry
- Preparation of process water
- Catalyst separation
- Dye desalination
- Latex concentration
- Desalination of optical brighteners
- Separation of dissolved materials or compounds after catalysis
- Acid/caustic recycling
- Filtration of suspended matter from heterogeneous reactions
- Concentration after diafiltration