Home » Silverson » Brewing Industry – Dispersion of Beer Foam Head Retaining Agents

Brewing Industry – Dispersion of Beer Foam Head Retaining Agents


Solutions for Your TOUGHEST MIXING Applications in Food


 Brewing Industry Dispersion of Beer Foam Head Retaining Agents      



Dispersion of Beer Foam Head Retaining Agents

  Ingredients such as propylene glycol alginate (PGA) may be added to beer to stabilize the foam head and to aid resistance to breakdown of foam in the presence of detergent residues or grease on the glass.

The Process

  PGA is dispersed in water (referred to as “liquor” in the brewing industry) before being added to the beer. A typical dispersion process using conventional mixers would be as follows:• The vessel is charged with water.• The mixer is started.• The alginate is added gradually into the vortex and dispersed into the water.• Mixing continues for up to an hour (depending on batch size) to ensure thorough dispersion.

• The solution is then left to stand for several hours to allow hydration to be completed.

• The mixer is run for a further period to ensure the solution is homogeneous.

• Pasteurization may be carried out to destroy any micro-organisms.


The Problem

  Dispersion of this type of powder is one of the most difficult of all mixing operations. A number of problems are frequently encountered when using conventional mixers:• PGA tends to agglomerate. Partially hydrated material on the outside of the agglomerate prevents dry particles inside from being exposed to the surrounding liquid and dissolved. Conventional agitators do not produce sufficient shear to break these down.• Long mixing times are required to obtain the required dispersion/solution.• Powder has to be added under controlled (labor intensive) conditions to preventlump formation and scumline on the vessel.

• Once viscosity increase or gelling has started to occur, agitation of the solution and therefore dispersion of powder becomes increasingly difficult.

• Aeration must be avoided to prevent foaming, as owing to the nature of the product, the foam is difficult to disperse.


The Solution

By using a Silverson mixer, intermediate stages of production can be eliminated, product quality improved and processing times dramatically reduced as follows:


high speed rotation of the rotor blades

The vessel is charged with the required amount of water.The Silverson mixer is started and the alginate is added all at once as rapidly as possible. The high speed rotation of the rotors creates a powerful suction which draws the water and alginate particles into the workhead.
 high speed rotation of the rotor blades 2 The materials are subjected to intense shear within the workhead. Any agglomerated particles are fully broken down in the clearance between the ends of the rotor blades and the stator wall. The product is then forced out through the stator and returned to the mix.
 high speed rotation of the rotor blades 3 Fresh liquid and powdered ingredients are simultaneously drawn into the workhead, maintaining the mixing cycle. In a short time the product passes through the workhead many times, ensuring that thorough dispersion is rapidly completed.


The Advantages

  Dramatically reduced mixing times• Rapid powder addition rate eliminates operator error• Consistent product quality• Agglomerate-free mix• Stable viscosity of end product

• Thickening/gelling effect of the alginate is maximized

• Reduced aeration and oxygenation due to shorter mixing times.

The Silverson mixer to be used is determined by the batch size, formulation, type of

ingredients used and the viscosity of the end product.

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High Shear Batch Mixers

Suitable for batches of up to 300 gallons

• Can be used on mobile floor stands

• Can easily be moved from vessel to vessel



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High Shear In-Line mixers


• Easily retro fitted to existing plant

• Ideal for larger batches

• Aeration free

• Self pumping

• Can be used to discharge vessel

• Ultra Hygienic models available


Soft Drink Manufacture Dispersion of Artificial Sweeteners (6)



Ideal for larger batches or repeated smaller batches

• Capable of rapidly incorporating large volumes of


• Minimized aeration

• Minimized cleaning requirements

• Controlled powder addition rate

• Minimum operator input required




Vendor Contact Information:

 Visit supplier’s page:




U.K. (United Kingdom) : Ph +44 (0) 1494 786331

U.S. A.(United States of America) :  Ph 413-525-4825  Fax: (413) 525-5804

Germany : 0171 3856588

France: 00 33 1 60 77 91 92.

Spain, Italy, Brazil, Portugal: +44 1494 786331in UK

Silverson Machines,Inc.

355 Chestnut Street, East Longmeadow, MA 01028



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