Элементы для ультрафильтрации | Alfa Laval

Элементы для ультрафильтрации

The ultrafiltration spiral membranes from Alfa Laval are based on a unique construction of either polypropylene or polyester support material in a hygienic full-fit design that provides optimum cleaning conditions. The spiral membranes are available with different ultrafiltration membrane types and in different combinations of length, diameter and feed spacer size

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The pores of the membranes used for Alfa Laval ultrafiltration spiral membranes are small, having a cut-off range from 1,000 to 100,000 molecular weight (MWCO), and the applied pressure is relatively low. Salts, sugars, organic acids and smaller peptides pass through the pores of the membrane, whereas proteins, fats and polysaccharides are retained.

Using appropriate ultrafiltration membranes also makes it possible to fractionate a feed stream into two distinct streams, with each stream containing dissolved components with different molecular weights.

The Alfa Laval ultrafiltration spiral membranes are a popular choice for many processes applied in the food, beverage, dairy, biotech and pharmaceutical industries where they are used for product recovery for example of an active from fermentation broth, as well as product purification, fractionation and concentration.

Alfa Laval offers a comprehensive range of spiral membranes with different characteristics and properties.

Dairy series 

For dairy applications Alfa Laval offers two series of tailor-made spiral membranes: The Dairy UF-PE series and the Dairy UF-pHt series. The spiral membranes of these series are USDA approved.

The dairy UF-PE spiral membrane, which is manufactured with polyester support material, is available with MWCO values between 5,000 and 20,000 dalton.  

The dairy UF-pHt spiral membrane, which is cast on polypropylene backing paper, is available with MCWO values between 5,000 and 20,000 dalton.

ETNA series

The ETNA spiral membrane is made of composite fluoro polymer cast on polypropylene (PP) backing material. The ETNA spiral membrane is available in two different types with a molecular weight cut-off value (MWCO) of either 1,000 or 10,000 dalton.

FS series

The FS spiral membrane is also made of composite fluoro polymer cast on polypropylene backing material. The FS spiral membrane has a MWCO value of 100,000 dalton.

RC-PE Series

RC-PE series

The RC-PE spiral membrane is made of regenerated cellulose cast on polyester support material. The RC-PE spiral membrane has a MWCO value of 10,000 dalton.

RC-PP series

The RC-PP spiral membrane is made of regenerated cellulose cast on polypropylene support material. The RC-PP spiral membrane has a MWCO value of 10,000 dalton.

UF-PE series

The UF-PE spiral membrane is made of either polysulphone or polyethersulphone cast on polyester support material. The UF-PE spiral membrane is available in different types with MWCO values ranging from 5,000 to 25,000 dalton.

UF-pHt series

The UF-pHt spiral membrane is characterized by its tolerance towards high pH and temperature. It is made of polysulphone or polyethersulphone cast on polypropylene backing material. The UF-pHt spiral membrane is available in different types with MWCO values ranging from 2,000 to 100,000 dalton.

UFX-pHt series

The UFX-pHt spiral membrane is characterized by its ability to tolerate high pH and temperatures. The membrane, which is cast on polypropylene support material, is made of polysulphone, permanently hydrophilic. The UFX-pHt spiral membrane has a MWCO value of 10,000.

Benefits

  • cost-effective operation due to low energy consumption
  • long life time compared to traditional dead-end filtration  
  • cover a broad spectrum of flux properties and pore sizes
  • available in different combinations of length, diameter and spacer size 
  • sanitary design with all materials in compliance with EU Regulation (EC) 1935/2004, EU Regulation 10/2011 and FDA regulations (CFR) Title 21
  • same membrane types available as both flat sheet membranes and spiral membranes
  • suitable for extensive range of processes
  • manufactured by Alfa Laval's own membrane centre
Ultrafiltration spiral membrane from Alfa Laval

Принцип работы

В основе технологии мембранной фильтрации лежит использование полупроницаемой мембраны для разделения жидкости на два разных потока.
 
Перекачивание жидкости через поверхность мембраны создает положительное трансмембранное давление, которое позволяет любым компонентам, размер которых меньше пористости мембраны, проходить через нее, образуя пермеат.
 
Компоненты, размер которых превышает размер пор, просто не могут пройти через мембрану и остаются в так называемом ретентате. Поверхность мембраны остается свободной от засорения под действием силы потока жидкости, движущегося параллельно поверхности мембраны.
 

Спиральная мембрана состоит из нескольких мембранных "конвертов" с 2 мембранными листами, разделенными сеткой для разделения пермеата, каждый из которых приклеен к центральной трубе для сбора пермеата.

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Между каждой парой оболочек находится разделитель, который создает канал подачи, позволяя потоку подачи проходить по всей длине спиральной мембраны, в то время как пермеат, проходящий через мембрану в оболочку мембраны, течет по спирали в трубу для сбора пермеата.
 
Красный = Подача/ретентат.
Желтый = пермеат.