View Table of Contents Beer Stabilization (continued) BASF Divergan ® F and Divergan ® RS PVPP (Polyvinylpolypyrrolidone) Manufactured by BASF, Divergan F is used throughout the world to stabilize beer against chill haze. BASF’s unique polymerization process produces the purest PVPP, 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 be dosed inline or through 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.
Micrograph of Divergan ® F (PVPP)
Particle Size: ~ 50 um Dose Rate: Beer up to 65% malt
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)
Dose Rate: Beer more than 65% malt
Dosing of Stabilizers • Inline Dosing: 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. • Batch Dosing: Add the kieselsol, hydrogel/xerogel, or 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. Alone: 25-40 g/hL (~5-10 lb/100 US bbl). With Silica: 10-30 g/hL (~2.5-7.75 lb/100US bbl) Preparation: Mix with deoxygenated water at a 10% w/w ratio. The use of a CO2 sparger in the slurry water will help to deoxygenate the water. Agitate slurry for 1-2 hours prior to addition. Contact time: 5 minutes Polyphenol removal effectiveness: 55% of mass Pack Size: 44 lb (20 kg) drum
• Removal from Beer: Stabilizers are removed from beer via centrifugation or filtration.
18 2025 - 2026 Gusmer Enterprises, Inc. Brewing Products Catalog
Powered by FlippingBook