Because some solids are poorly soluble in water, when one or more of these solids are present in large quantities in an aqueous solution, they can exist in an emulsion state under hydraulic or external agitation, forming an emulsion. Theoretically, such a system is unstable. However, if surfactants (such as soil particles) are present, the emulsion state can become very severe, making it difficult to separate the two phases. The most typical examples are oil-water mixtures in oil-water separation and water-oil mixtures in wastewater treatment, where relatively stable oil-in-water or water-in-oil structures are formed between the two phases. The theoretical basis for this is the “electric double layer structure.”

In this situation, certain agents are added to disrupt the stable double-layer structure and stabilize the emulsion system, thereby achieving phase separation. These agents used to disrupt the emulsion are called demulsifiers.

Main uses: Demulsifiers are surfactants that break down the structure of emulsions, separating the different phases within the emulsion. Crude oil demulsification refers to using the chemical action of demulsifiers to separate oil and water from an emulsion of oil and water, thus achieving crude oil dehydration and ensuring the water content standard for exported crude oil.

The simplest and most effective method for separating the organic and aqueous phases is to use a demulsifier to eliminate the emulsion and form an emulsion interface of a certain strength, thus achieving phase separation. However, different demulsifiers have varying abilities to demulsify the organic phase, and their performance directly affects the separation effect. In penicillin production, an important procedure involves extracting penicillin from the fermentation broth using an organic solvent (such as butyl acetate). Because the fermentation broth contains complex substances such as proteins, sugars, and mycelia, the interface between the organic and aqueous phases is unclear during extraction, forming an emulsion zone of a certain strength, which significantly impacts the yield of the final product. Therefore, it is essential to use a demulsifier to eliminate the emulsion and achieve rapid and effective phase separation.

The principle and uses of demulsifiers

Because some solids are poorly soluble in water, when one or more of these solids are present in large quantities in an aqueous solution, they can exist in an emulsion state under hydraulic or external agitation, forming an emulsion. Theoretically, such a system is unstable. However, if surfactants (such as soil particles) are present, the emulsion state can become very severe, making it difficult to separate the two phases. The most typical examples are oil-water mixtures in oil-water separation and water-oil mixtures in wastewater treatment, where relatively stable oil-in-water or water-in-oil structures are formed between the two phases. The theoretical basis for this is the “electric double layer structure.”

In this situation, certain agents are added to disrupt the stable double-layer structure and stabilize the emulsion system, thereby achieving phase separation. These agents used to disrupt the emulsion are called demulsifiers.

Main uses: Demulsifiers are surfactants that break down the structure of emulsions, separating the different phases within the emulsion. Crude oil demulsification refers to using the chemical action of demulsifiers to separate oil and water from an emulsion of oil and water, thus achieving crude oil dehydration and ensuring the water content standard for exported crude oil.

The simplest and most effective method for separating the organic and aqueous phases is to use a demulsifier to eliminate the emulsion and form an emulsion interface of a certain strength, thus achieving phase separation. However, different demulsifiers have varying abilities to demulsify the organic phase, and their performance directly affects the separation effect. In penicillin production, an important procedure involves extracting penicillin from the fermentation broth using an organic solvent (such as butyl acetate). Because the fermentation broth contains complex substances such as proteins, sugars, and mycelia, the interface between the organic and aqueous phases is unclear during extraction, forming an emulsion zone of a certain strength, which significantly impacts the yield of the final product. Therefore, it is essential to use a demulsifier to eliminate the emulsion and achieve rapid and effective phase separation.