Alfa Laval

Membrana plana de Osmosis Inversa

The selection of nanofiltration and reverse osmosis membranes from Alfa Laval covers a broad spectrum of flux properties and rejection capabilities. The membranes are used in an extensive range of processes applied in the food, beverage, dairy, biotech and pharmaceutical industries

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Alfa Laval offers various polymeric flat sheet membranes for nanofiltration (NF) and reverse osmosis (RO). The membrane material is thinfilm composite based on a unique construction on either polypropylene (PP) or polyester (PE) support material which provides optimum cleaning conditions.

NF membranes

The NF membrane for nanofiltration is cast on polyester support with a magnesium sulfate rejection of >98%

RO membranes

Alfa Laval offers three different polymeric flat sheet membrane types for reverse osmosis. RO90 and  RO99 membranes are cast on polyester support with sodium chloride rejections between 90 and >98%. The RO98pHt membrane, which is cast on polypropylene support with a sodium chloride rejection of >97%, is tolerant to high pH and temperature.

Benefits

  • cover a broad spectrum of flux properties, pore sizes, molecular weight cut-off values and rejection capabilities
  • available by the metre, as standard 20 x 20 cm sheets or cut into flat sections to fit into all Alfa Laval plate-and-frame module configurations
  • delivered with necessary lock and passage rings
  • suitable for extensive range of processes
  • manufactured by Alfa Laval's own membrane centre

Cómo funciona

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Reverse osmosis (RO)

RO uses the tightest possible membrane in liquid separation. In principle, water is the only material that can permeate the membrane. All other materials (salts, sugars, etc.) will be unable to pass through.

Nanofiltration (NF)

NF is not as fine a separation process as reverse osmosis, and uses membranes that are slightly more open. Nanofiltration allows small ions to pass through while excluding larger ions and most organic components.

Ultrafiltration (UF)

UF involves using membranes in which the pores are larger and the pressure is relatively low. Salts, sugars, organic acids and smaller peptides are allowed to pass, while proteins, fats and polysaccharides are not.

Microfiltration (MF)

In MF, suspended solids, bacteria and fat globules are normally the only substances not allowed to pass through.