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Juice Filtration with ECLIPSE MEMBRANES™

Porous PTFE Membranes for Juice Filtration

Membrane filtration employing a cross flow design, is a proven technology in the fruit juice industry. It has been practiced for over 20 years with remarkable success, replacing more traditional forms of filtration including plate and frame, rotary vacuum systems and diatomaceous earth coatings. For many juices, especially apple and pear, cross flow membrane filtration is the most widely employed form of filtration.

 

A review of the literature shows that cross flow membrane filtration produces a more consistent product, excellent clarity, lends itself readily to automation, and generates minimal waste.

 

In theory, clarification by tangential or cross flow membrane filtration can be used for all fruit juices but filtration performance depends on the viscosity, pulp content and characteristics of the fruit juices. It is often combined with an enzymatic treatment (increasing the yield with a better recycle of the retentate). These juices are then used as beverages, for flavored mineral waters, etc., or to prepare for further processing steps such as concentration, de-acidification, extraction, etc.

 

While the use of cross flow membrane filtration is not as widely accepted for the darker juices (from grapes, berries, cranberries, etc.) membrane filtration is growing annually in this market segment as well.

 

With tangential ultrafiltration, one is able to produce microbiologically stabilized juices (pasteurization of the permeate is not required, eliminating a processing step that hurts the taste of the product). The retentate consisting of pulp and microorganisms is pasteurized. The clarified juice can also be remixed with the pulp retentate after it’s pasteurization.

 

Besides exacting control over pore size distribution and flux rate, the membranes and potting system need to be able to tolerate the aggressive and frequent cleaning cycles common to all food and beverage filtration processes. Along with the repeated cleaning cycles, the membranes and potting system must be able to tolerate repeated pressure and temperature swings without splits, ruptures, tears, or pull-out from the potted end.

 

For many juices, there is the added complication of the high solids content requiring large diameter tubular membranes to prevent blinding with solids. There is also the associated abrasion and wear that comes with high velocity, high solids flow.

What Distinguishes Markel's System from Competitors on the Market

What separates the Markel porous PTFE hollow fiber and tubular membrane system from competitors on the market is:

 

• Both the tubular membrane and equally importantly, the potting system, are highly resistant to the most aggressive cleaning systems employed in the juice industry, including strong alkali, acids, and ozone cleaning agents. The Markel porous PTFE hollow fiber will not chemically degrade nor will any contaminants leach from the membrane or potting system.

 

• The extremely high service temperature (120 °C or above, depending on the potting system) allows the cleaning process to be conducted at elevated temperatures, greatly shortening the cleaning cycle.

 

• Markel porous PTFE hollow fiber and tubular membranes are very resistant to the abrasive action of a high solids process stream.

 

• The strength of Markel porous PTFE hollow fiber membranes exceeds that of typical polymeric membrane systems on the market, and requires no skeletal support or sub-structure.

 

• Individual Markel tubular membranes are easily replaced, meaning that if a tube is damaged or obstructed, the module may be brought back to full surface area in a short period of time at minimal cost.

More Information about Porous PTFE Membranes for Juice Filtration

 

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