Alfa Laval

UF spiral

Les membranes d'ultrafiltration en spirale (UF) d'Alfa Laval constituent un choix éprouvé pour de nombreux processus dans les industries agroalimentaire, des boissons, des produits laitiers, de la biotechnologie et de la pharmacie, utilisées pour la récupération, la purification, le fractionnement et la concentration de produits. Alfa Laval propose une gamme complète de membranes UF avec différentes caractéristiques et propriétés.

Spiral wound membrane UF

Améliorez la rentabilité de votre processus de fabrication de membranes d'UF

  • Fonctionnement économique grâce à une faible consommation d'énergie
  • Efficaces – pas besoin de remplacer/d'éliminer les cartouches ou les consommables utilisés dans la filtration frontale traditionnelle.
  • Excellentes stabilités chimique et thermique avec une durée de vie jusqu'à plusieurs années
  • Faibles coûts de démarrage par rapport à d'autres solutions
  • Flexibles – disponibles dans différentes combinaisons de longueur, de diamètre et de taille d'entretoise
L'expérience d'Alfa Laval dans la technologie membranaire remonte à l'invention de la technologie membranaire elle-même (plus de 50 ans). Les membranes d'UF, qui sont fabriquées dans notre propre usine, se fondent sur une architecture unique en polypropylène ou en polyester et une conception sanitaire parfaitement adaptée qui offre des conditions de nettoyage optimales. Extrêmement durables, ces membranes ont d'excellentes stabilités chimique et thermique et leur durée de vie atteint plusieurs années. Nous avons à la fois des membranes planes (pour la filtration ou les travaux de laboratoire) et à spirale (pour les applications plus importantes), ce qui représente un avantage lors de votre passage à une production supérieure.
.

Alfa Laval offers different ultrafiltration membrane technology

The ultrafiltration spiral membranes range from 1,000-100,000 molecular weight cut off (MWCO), and the applied pressure is relatively low. Salts, sugars, organic acids and smaller peptides pass through the pores while proteins, fats and polysaccharides are retained.

With our spiral wound UF membranes you can fractionate a feed stream into two distinct streams, with each stream containing dissolved components with different molecular weights.

UF-pHt™ series

  • UF-pHt™ membranes tolerate high temperatures and pH values. The membranes are made of polysulphone or polyethersulphone on polypropylene support material. MWCO values range between 2,000 and 100,000 Da. Most of the spiral UF membrane are USDA approved and Halal certified.

UF-PP series

  • The UF-PP membranes are made of fluoro polymer, polysulphone, regenerated cellulose acetate or composite fluoro polymer on polypropylene support material. MWCO values range from 1,000 to 100,000 MWCO. One type is Halal certified.

UF-PET series

  • The UF-PET ultrafiltration spiral membranes are based on polyester support material. The polymeric membrane is made of polysulphone, polyethersulphone or regenerated cellulose acetate with up to 100,000 MWCO values. Certain types are USDA approved and we can offer products with Halal certificates upon request. 

Dairy series

Alfa Laval has two series of spiral wound membranes tailor-made for dairy applications: Dairy UF-PET and the Dairy UF-pHt™.

  • The dairy UF-PET spiral membranes, which are manufactured with polyester support material, are available with MWCO values between 5,000 and 10,000 Da.  
  • The dairy UF-pHt™ spiral membranes, which are cast on polypropylene backing paper, are available with MWCO values between 5,000 and 20,000 Da.

Both types are USDA approved and we can offer products with Halal certificates upon request. 

Our ultrafiltration membrane materials are compliant with all major regulations 

Our spiral wound membrane materials are compliant with all major regulations 

All membrane materials used for both flat sheet and spiral wound membrane configurations meet EU Regulation (EC) 1935/2004, EU Regulation 10/2011, EU Regulation (EC) 2023/2006 and FDA regulations (CFR) Title 21, and are suitable for use in food and pharmaceutical processing applications. Compliance also extends to the related equipment and fittings, including items such as plate-and-frame units, element housings and pumps, supporting safe and efficient spiral membrane filtration in a wide range of industries.

Ultrafiltration spiral membrane from Alfa Laval

Fonctionnement

.

The basic technology behind membrane filtration involves using a semi-permeable membrane to separate a liquid into two distinct streams.

Pumping this liquid across the surface of the membrane creates a positive trans-membrane pressure that allows any components smaller than the porosity of the membrane to pass through, forming the permeate.

Any components larger than the pore size simply cannot pass through, and remain behind in what is called the retentate. The surface of the spiral wound membrane is kept free of blockages by the force of the liquid flow moving parallel to the membrane surface.

Construction of the ultrafiltration spiral membrane

Efficient spiral membrane filtration

A spiral membrane comprises of several membrane 'envelopes' with two membrane sheets separated by a permeate spacer mesh, each glued to a central permeate collection tube.

Between each pair of envelopes there is a spacer which creates the feed channel, allowing the feed to flow across the length of the spiral wound membrane, whilst the permeate passing through the membrane into the membrane envelope flows in a spiral pattern to the permeate collection tube.

 

Red = Feed/retentate.

Green = Permeate.

The flow pattern in a UF spiral membrane where red represents the feed/retentate and yellow the permeate.