Beer decolorizing film and preparation method thereof

Abstract

The invention discloses a beer decolorizing membrane and a preparation method thereof.The beer decolorizing membrane is prepared by taking a mixed solution of PVA, PAA and a cross-linking agent as a hydrophilic membrane coating solution, a mixed solution of gamma-aminopropyltriethoxysilane, water and ethyl alcohol as a hole blocking solution and a non-woven fabric coated with a mixed solution of PEI, NMP and LiCl as a base membrane, immersing the base membrane into the hole blocking solution, and carrying out vacuum drying to obtain the beer decolorizing membrane. And then coating the hydrophilic coating liquid on the surface, and carrying out polymerization reaction. The prepared beer decolorizing membrane is good in hydrophilicity, large in flux and high in pollution resistance, pigments, residual sugar, protein, amino acid and a small amount of other macromolecular flavor components in beer can be effectively intercepted, colorless and transparent beer with the unchanged alcoholic strength is prepared, the colored beer which does not penetrate through the membrane can be sold as low-alcohol beer after being diluted and subjected to alcohol reduction, and the method is suitable for popularization and application. Therefore, the maximum resource utilization of the raw beer is realized.

Description

technical field [0001] The invention relates to the technical field of membrane material preparation, in particular to a beer decolorization membrane and a preparation method thereof. Background technique [0002] Since the birth of beer, it has been generally divided into light yellow beer, dark beer and dark beer according to its color. The most general on the market at present is light yellow beer, although the method of beer production is different, and kind is also more, its color and local flavor are all basically the same, thereby make light yellow beer become the beer beverage kind that is widely accepted by people. In recent years, transparent cola, coffee and beer have become more and more popular. It is generally believed that one of the reasons for the popularity of transparent beverages is the demand for health. This type of beverage product is easier to give consumers the impression of no burden and no calories, caters to the trend of healthy eating in recent ...

AI Technical Summary

Problems solved by technology

However, the activated carbon process has the following problems: (1) After decolorization, activated carbon is dissolved in the solution as a solid, and there is a problem of solid-liquid separation, which cannot be completely separated at present, and will leak into beer products; (2) In addition to adsorbing pigment substances, activated carbon is partially Ethanol and a large number of aroma components will also be adsorbed; (3) Activated carbon is easy to form solid waste and is a consumable

In addition, some patented technologies at home and abroad use reverse osmosis and ultrafiltration to treat beer. However, the effect of ultrafiltration membranes on pigment interception is not ideal, and the processing capacity of reverse osmosis membranes is too small, requiring high operating pressure.