Crude Oil Demulsifier

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The crude oil demulsifier is a high-molecular-weight polyether nonionic surfactant polymerized from propylene oxide (PO) and ethylene oxide (EO) using polyamines, polyols, diepoxides and various resins as initiators. With molecular weights typically between 2,000 and 20,000, the amphiphilic structure (lipophilic + hydrophilic groups) penetrates the oil-water interface, disrupts the natural emulsifier film, and coalesces water droplets for oil-water separation.

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Product Overview

The crude oil demulsifier is a high-molecular-weight polyether nonionic surfactant polymerized from propylene oxide (PO) and ethylene oxide (EO) using polyamines, polyols, diepoxides and various resins as initiators. With molecular weights typically between 2,000 and 20,000, the amphiphilic structure (lipophilic + hydrophilic groups) penetrates the oil-water interface, disrupts the natural emulsifier film, and coalesces water droplets for oil-water separation.

The water-soluble type (DM-W) is used for high water-cut produced fluids; the oil-soluble type (DM-O) is suitable for low water-cut or long-distance pipeline conditions. Both types can be used in combination based on crude oil properties.

Packaging and Storage

Item	Specification
Model	HDC-DM Series (Water-soluble DM-W / Oil-soluble DM-O)
Packaging	200L iron/HDPE drum (~200 kg net) 1000L IBC tote (~1000 kg net) Bulk tanker delivery
Storage	Cool, dry, ventilated; away from sunlight; keep sealed
Shelf Life	12 months
Precautions	May thicken at low temperature — allow to reach ambient temperature and stir before use

Technical Specifications

Item	DM-W	DM-O	Test Standard
Appearance	Uniform liquid, no impurities	Uniform liquid, no impurities	Visual
pH	6-8	6-8	GB/T 9724
Density	0.98-1.08 g/cm³	0.90-1.00 g/cm³	GB/T 4472
Kinematic Viscosity	≤100 mm²/s	≤80 mm²/s	GB/T 265
Pour Point	Below local minimum temp.	Below local minimum temp.	GB/T 510
Flash Point	≥60℃	≥60℃	GB/T 261
Dehydration Rate	≥95%（60℃，120min） ≥95% at 60°C, 120 min	≥95%（60℃，120min）	SY/T 5280-2018
Oil in Water	≤500 mg/L	≤500 mg/L	spectrophotometry
Solubility	Soluble in water	Soluble in alcohols, hydrocarbons	Visual

Product Advantages

• Fast breaking speed

Visible oil-water separation within 5-15 minutes; dehydration rate exceeds 90% in 30-60 minutes
• Clean water output

Separated water is clear with oil content ≤500 mg/L — suitable for direct reinjection or discharge, reducing downstream water treatment load
• Clear interface

Narrow and well-defined oil-water interface — no excessive rag layer or emulsion band
• Low-temperature performance

Effective breaking at 40-50°C — suitable for stations without heating facilities
• Strong compatibility

No precipitation or mutual efficacy reduction when used with corrosion inhibitors, biocides or scale inhibitors
• Customizable formulations

Over 100 polyether formulations available — can be tailored to specific crude properties (density, viscosity, water cut, asphaltene content)

Application Scenarios

● Wellhead — demulsifier injected at the wellhead utilizes pipeline turbulence for in-transit breaking, achieving partial dehydration by the time crude reaches the central station

● Central station three-phase separators — dosed upstream of separators to accelerate oil-water separation and increase throughput

● Electric dehydrators — used as pre-treatment to reduce water cut to ≤0.5% before electrostatic dehydration

● Refinery desalting — injected upstream of desalters to remove salts and impurities from crude oil

● Heavy oil and polymer-flood fluids — customized formulations for viscous and polymer-containing crudes

Dosing Guidelines

Demulsifier performance is highly crude-specific — the same model may perform differently in different oilfields. Indoor bottle testing with field crude samples is recommended before application. Compare dehydration rate, oil-in-water content and interface clarity across different models and dosages to select the optimal formulation.

Crude Type	Dosage	Temperature	Settling Time
Light crude	20-50 ppm	40-60℃	30-60 min
Medium crude	30-80 ppm	50-70℃	60-120 min
Heavy crude	50-100 ppm	60-80℃	120-180 min
Polymer-flood fluid	50-150 ppm	55-75℃	90-180 min
Refinery desalting	5-20 ppm	110-140℃	Electrostatic

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