Crosspure Polymer�The Future of Diatomaceous Earth-free Filtration
MBAA TQ doi:10.1094/TQ-46-4-1216-01 |
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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
