View Table of Contents Beer Stabilization (continued) NALCO Nalco 1072 – ( Kieselsol or SilicaSol ) Nalco 1072 kieselsol is a liquid colloidal suspension of silicon dioxide, which is extremely effective in chillproofing and has been used in production of “vegan-friendly” beers. The resulting silica/protein complexes form relatively compact sediment cakes (tank bottoms) that aid in separation (through filtration) from the stabilized beer. Nalco 1072 is a ready-to-use solution that offers convenience in use. Particle Size : ~ 8 nm Dose Rate: 200-500 ppm Contact Time: ~ 8 hr Sizes: 5 USG pails, 55 USG polydrums BASF Divergan ® F and Divergan ® RS PVPP (Polyvinylpolypyrrolidone) Gusmer is a major distributor of Divergan F to the beer industry. Manufactured by BASF, Divergan F is used throughout the world to chill haze stabilize beer. BASF’s unique polymerization process produces the purest polyvinylpolypyrrolidone, which more selectively adsorbs the polyphenols that can cause instabilities. There is evidence that Divergan F also helps to stabilize flavor through the reduction of flavonoid polyphenols, which are particularly prone to polymerize into products of higher molecular weight and potential bitter flavor. Divergan F works quickly, and its short contact time means it can frequently be dosed inline, but it can also be dosed in a batch method. Divergan RS is a regenerable PVPP, which works in the same manner, but offers some economies to larger facilities that are set up to regenerate it. Alone: 10-30 g/hL (~2.5-7.75 lb/100 US bbl) With Silica: 10-20 g/hL (~2.5-5.0 lb/100 US bbl) Alone: 25-40 g/hL (~5-10 lb/100 US bbl). With Silica: 10-30 g/hL (~2.5-7.75 lb/100US bbl) Contact time: 5 minutes Polyphenol removal effectiveness: 55% of mass Dose Rate: Beer more than 65% malt Particle Size: ~ 50 um Dose Rate: Beer up to 65% malt
Preparation of Stabilizers Kieselsol: These solutions come ready-made and can be added as described in the dosing section below. Hydrogel/Xerogel/PVPP: The amorphous powder should be mixed with deoxygenated water at a 10% w/w ratio. (1 kg powder: 10 liters DAW or ~8 lb: 10 USG DAW). The use of a CO 2 sparger in the slurry water will help to deoxygenate the water. Agitation: Hydrogel/Xerogel – Agitate slurry for at least 20 minutes prior to addition. PVPP – Agitate slurry for 1-2 hours prior to addition. Dosing of Stabilizers Inline Method: The kieselsol, hydrogel/xerogel or PVPP slurries are dosed proportionally into the beer stream by means of a metering pump. The products are allowed to react with the beer. Depending upon contact time required for each product, a buffer tank may be utilized. Resultant sediments should be removed via filtration depending on the requirements of the specific stabilizer. Batch Method: Add the kieselsol or hydrogel/xerogel/ PVPP slurries into the product while filling the finishing tank. Add the stabilizing agent proportionally during the fill or as a single shot method through the spray ball arm. Once the stabilizing agent has reacted with the respective protein or tannin, it will settle to the bottom of the tank as sediment. Settling times vary due to tank geometry and stabilizer/protein/tannin complex size. The stabilized beer can be separated from the sediment prior to filtration and any leftover sediment is easily removed during CIP. Inadvertent over-dosing or contact time of several days causes no negative effects in the beer. For more information on beer chill haze stabilization and the use of stabilizing agents, please contact your Gusmer representative.
Divergan F Sizes: 20 kg drums Divergan RS Size: 20 kg drums
Micrograph of Divergan ® F (PVPP)
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