EMULSIFIER FOR INVERT EMULSIONS Russian patent published in 2019 - IPC B01F17/14 E21B43/27 C09K8/80 

FIELD: chemistry.

SUBSTANCE: invention relates to emulsifiers of invert emulsions and can be used in oil and gas industry. Proposed emulsifier of invert emulsions contains an oil-soluble surfactant and a hydrocarbon solvent, characterized in that as an oil-soluble surfactant it contains a mixture of mono- and/or dialkyl esters of phosphoric acid - a product of reacting phosphorus pentoxide and fatty alcohols, in form of separate alcohols or mixture of alcohols with length of hydrocarbon radical C₈-C₂₀, with the following ratio of components, wt. %: oil-soluble surfactant 20–80; hydrocarbon solvent 20–80.

EFFECT: disclosed is a novel efficient emulsifier for obtaining a homogeneous mixture of two immiscible liquids, such as oil and water, which enables invert emulsions with given rheological characteristics, having high thermal stability and aggregative stability.

1 cl, 7 ex, 1 tbl