Innovative liquid filtration and separation by solvent resistant membranes
Organic Solvent Nanofiltration (OSN)
Chemical resistant membrane materials, in combination with innovative technology to modify surfaces for specific purposes, enable a wide range of new promising applications for membrane separation processes.
Based on these developments Organic Solvent Nanofiltration (OSN) offers attractive solutions for challenging separations in the molecular range between ultrafiltration and reverse osmosis, focusing on treatment of organic liquids.
As alternative to or in combination with conventional separation operations, solvent resistant membranes provide the opportunity of highly efficient process installations for the selective separation of liquid organic mixtures.
BORSIG Membrane Technology provides composite membranes with excellent performance to meet high requirements in nanofiltration applications. Based on our know-how and experience in process design and engineering various applications have been already implemented.


Features and Advantages of OSN-Membranes from BORSIG
Membrane Technology

Outstanding performance with regard to permeability and selectivity;
Chemical resistance to organic media e.g.: Alkanes (Hexane, etc.), Aromatics (Toluene, etc.), Alcohols (Ethanol, etc.), Ethers (THF, etc.), Ketones (Acetone, etc.), Esters (Ethyl acetate, etc.);
Long-term durability;
Mechanical stability in a wide range of pressures and temperatures;
Easy configuration for different types of modules.

Applications (Examples)

Recovery of homogenous catalysts from reaction mixtures;
Conditioning of liquid hydrocarbons;
Purification of organic solvents;
Concentration and cleaning of fine chemicals;
Recycling of used lube oil;
Fractionating of different molecules.

Highly sophisticated test units and advanced analytics ensure the optimised selection and reliable evaluation of membranes.
Membrane production and supply of required membrane modules in envelope or spiral wound type design is provided by BORSIG Membrane Technology to all international codes and standards.

Our Services at a Glance

Evaluation of your separation problem and technical support by our experts;
Lab-scale membrane tests (chemical resistance, membrane screening, feasibility studies);
Development and optimisation of nanofiltration membranes for your specific application;
In-house membrane and module manufacturing;
Pilot scale field tests;
Process design (basic engineering);
Detail engineering and construction;
Process units (pilot scale, production process systems).



Cell design enables defined cross-flow velocities;
Reproducible test results;
Simultaneous testing of two membranes possible;
Feed, retentate and permeate sampling (during unit operating);
Automated unit control and monitoring;
Computer-aided data processing and documentation;
Temperature-controlled tests.

Scope of Applications

Membrane screening and characterisation;
Long-term performance tests;
Determination of reliable scale-up parameters for industrial modules;
Optimisation tests for industrial process parameters;
Small-scale production and processing for product evaluation (purification, concentration).