Demulsifier additive

At present, there are a wide variety of demulsifier additive for crude oil at home and abroad, but most of demulsifier additive compositions are non-ionic demulsifier additive and their demulsification effects vary.

But in terms of their molecular composition, they are mainly copolymers of ethylene oxide and propylene oxide. Currently, there are mainly five types of commonly used non-ionic demulsifier additive in oilfields:

1.Peregal or OP type, which is a copolymer of high-carbon alcohol or alkylphenol as the initiator and ethylene oxide.

2.SP type, a copolymer with high-carbon alcohol as the initiator.

3.BE and BP types and their modified products, two or three segment copolymers of propylene glycol with ethylene oxide and propylene oxide and their modified products.

4.GP type, a three-segment copolymer with glycerol as the initiator.

5.AR and AF types and their modified products, binary and ternary copolymers with alkylphenol formaldehyde resin as the initiator and their modified products.

Demulsifier dewatering can effectively disrupt the stable structure in the crude oil emulsion, separating the emulsified water from the crude oil. This helps to reduce the water content of the crude oil and thereby enhance its purity. For instance, after demulsification treatment, the water content of the crude oil can be decreased from a relatively high percentage (such as 10%--30%) to a lower level (such as 0.5%--3%), making it more in line with the processing requirements of refineries.