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Crosspure Polymer�The Future of Diatomaceous Earth-free Filtration

MBAA TQ doi:10.1094/TQ-46-4-1216-01  |  VIEW ARTICLE

John Foley (1), Andrew Fratianni (1), Helmut Meffert (2), Gero Spika (2), and Uwe Schnell (1). 1. BASF Corp., Florham Park, NJ. 2. BASF SE, Ludwigshafen, Germany.

Abstract
BASF, in cooperation with breweries in Europe, has succeeded in demonstrating that Crosspure polymer is an effective technical and economic alternative to diatomaceous earth (DE) filtration and colloidal stabilization. The innovative product works in a manner similar to diatomaceous earth filtration (precoat filtration) combined with stabilization by polyvinylpolypyrrolidone (PVPP). The product is designed to be regenerated repeatedly so that a brewery can eliminate much of its inventory of filtration and stabilization aids. For these trials, various commercial lager beers were filtered and stabilized using Crosspure filter aid on an 8.2- or 45-m(^2) candle filter. Beer filtered with Crosspure achieved the target specifications for clarity, stability, and organoleptic qualities, and these analytical targets were maintained after several regenerations. Degrees Plato, alcohol, color, and turbidity were equal for beers filtered with either Crosspure or DE plus PVPP. For Crosspure, differential pressure during filtration remained within acceptable limits and was unchanged after several regenerations. The forcing test indicated that Crosspure-treated beers would have longer shelf-life stability when measured based on haze formation. When compared with DE plus single-use PVPP, operating costs for filter systems using Crosspure were up to 80% lower.

Keywords: Crosspure, filtration, diatomaceous earth, ecofriendly, polyphenols, PVPP 

S�ntesis
BASF, con la cooperaci�n de cervecer�as europeas, ha demostrado que el pol�mero Crosspure es una alternativa econ�mica y t�cnicamente efectiva a la filtraci�n con tierra diatom�cea (DE) y la estabilizaci�n coloidal. Este producto innovativo funciona de una manera similar a la filtraci�n con tierra diatom�cea (filtraci�n con precapa) en combinaci�n con estabilizaci�n mediante polivinilpolipirrolidona (PVPP). El producto se dise�� de manera que podr�a ser regenerado repetidas veces de manera que una cervecer�a pueda reducir su inventario de adyuvantes de filtraci�n y de estabilizaci�n. Varias cervezas (tipo lager) comerciales fueron filtradas y estabilizados utilizando el adyuvante de filtraci�n Crosspure en filtros de vela de 8.2 m(^2) y de 45 m(^2). Cerveza filtrada con Crosspure alcanz� las especificaciones requeridas para claridad, estabilidad, y calidad sensorial, y estas metas fueron mantenidas aun despu�s de varias regeneraciones. Los valores de extracto original, alcohol, color, y turbidez fueron iguales para cervezas filtradas tanto con Crosspure como con DE m�s PVPP. La presi�n diferencial en el filtro durante la filtraci�n con Crosspure se mantuvo dentro de l�mites aceptables y no empeor� despu�s de varias regeneraciones. La prueba forzada demostr� que las cervezas tratadas con Crosspure tendr�an mayor estabilidad de estante en mediciones basadas en la formaci�n de turbidez. Al compararla con DE m�s PVPP no regenerable, los costos de los sistemas de filtraci�n con Crosspure resultaron ser hasta 80% m�s bajos.

Palabras claves: Crosspure, eco amistoso, filtraci�n, tierra diatom�cea, polifenoles, PVPP

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