Foams during beer production and fermentation can be divided into two types. The first type of foam exists in the fermentation liquid. This type of foam has high viscosity, is easy to foam, and contains proteins, metabolic bacteria and other substances. The second type of foam is caused by CO2 produced by the respiration of microorganisms. It is fine and stable and difficult to eliminate. So what defoaming agent should be used to remove foam during beer fermentation? Nanhui defoamer manufacturer will show you the following 5 types.
(Introduction to defoaming agents for beer)
Defoaming agents can be divided into three categories: defoaming agents, foam suppressors and defoaming agents. In addition, according to their composition and structure, they can be divided into natural oil defoaming agents, silicone defoaming agents and high-grade alcohol defoaming agents. agents, polyether defoaming agents and polyether modified silicone oil defoaming agents, etc. Different types of defoaming agents have different characteristics and application ranges, and should be selected according to specific circumstances.
1. Natural oil defoamer.
Oil not only inhibits foam production, but also provides nutrients to the mycelium. Natural oils are fat-soluble and highly viscous. Different from the surface tension of fermentation broth, they have a certain ability to inhibit the generation of foam. At the same time, oil, as a natural carbon source, can provide nutrients for the growth and metabolism of mycelium, which is beneficial to the development of mycelium. However, the anti-foaming ability of oil is limited, and long-term use will lead to rancidity, oxidative deterioration and other phenomena. Therefore, when using grease, pay attention to using it in appropriate amounts and replacing it in time.
Polydialkylsiloxane defoaming agents have poor solubility in water and are difficult to disperse. When used alone, they have poor defoaming and foam suppression effects. However, we can disperse the silica powder particles in the mixture with the oil before use to improve its surface activity, stability, hydrophilicity and dispersion, thereby effectively enhancing its defoaming and anti-foaming effects. It is worth mentioning that this defoaming agent does not react with substances in the fermentation broth system, does not affect product quality, has a long-lasting foam suppression time, and is physically and chemically stable.
3. Advanced alcohol defoamer.
Advanced alcohol defoamer? This polymer has the advantages of strong penetrating ability, easy dispersion, high temperature and alkali resistance, and high efficiency in small quantities. It is widely used in chemical, pharmaceutical, food and other fields. Mainly refers to polymers of fatty alcohols, polyethers, hydrocarbons, amides, etc. It has strong penetrating ability and can effectively reduce surface tension and viscosity, thereby achieving defoaming effect; it is easy to disperse and can be dissolved in water and oil Evenly dispersed, thereby improving the stability of the product; in addition, it also has the characteristics of high temperature and alkali resistance, and can be used in different environments, with less usage and better effect.
Polyether defoamer is a nonionic surfactant with fast spreading speed, high stability, effective foam suppression and defoaming, and low toxicity. It is widely used in detergents, dyes, inks and other industries.
5. Polyether modified silicone oil defoaming agent.
Polyether modified silicone oil defoamer is a highly efficient defoamer obtained through polyether grafting and block modification. It has the benefits of silicone oil and polyether defoamer, with lower surface tension and greater dispersion. Large, it can effectively suppress and eliminate foam. It is not only widely used in the detergent industry, but also has important applications in food, medicine, cosmetics and other fields.
