Demulsifier
Oil-water emulsions need to be efficiently and quickly separated, increasing the output of crude oil, or benefitting next refining step, and causing impurities dissolved in the separated water.
Zhengxiang's demulsifiers are generally available for both oil-soluble and water -soluble type with different concentrations. When added to produced fluids, our demulsifiers migrate to the water/oil interface, rupture or weaken the rigid film and enhance water droplet coalescence. They operate at low dosages and show high efficiency at lower operating temperatures, while providing rapid water drop with minimum oil carryover.
Zhengxiang offers a broad range of emulsion breaking formulas to help achieve production and environmental goals. There are desalting demulsifier, hi-wax-content crude oil demulsifier, dense-crude oil demulsifier, EOR demulsifier, high-water-content crude oil demulsifier and reverse demulsifier etc.
SHANDONG ZHENGXIANG PETROLEUM TECHNOLOGY CO.,LTD
Zhengxiang company is a capably professional chemical company, located in Dongying city, the city of oil. We have a professional technical and sales team which have full experience in chemical field including many-years working experience in a global international company, and familiarity with international business, trade rules and domestic chemical industry.
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Strictly follow the MSDS and domestic & foreign safety and environmental protection laws and regulations, and actively implement HSE management.
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Sea and land transport ("China Railway Express", other railways, trucks), joint sea-and-rail transportation. Transfer or direct. Various packaging forms.
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![Extra Thick Crude Oil Demulsifier]()
Extra Thick Crude Oil DemulsifierZX-D2-02 is a concentrated demulsifier for the dehydration and desalting of crude oil emulsions. It can be used both in oilfield and refinery.read more -
![Fracturing And Acidizing Demulsifier]()
Fracturing And Acidizing DemulsifierDuring the oil well stimulation operations such as fracturing and acidizing, the working fluid flows through the reservoir at a high speed, forming an emulsion with the crude oil in the reservoir,...read more -
![Demulsifier For Crude Oil]()
Demulsifier For Crude OilCrude oil demulsifier (demulsifier for crude oil) ZX-D3-04 is an oilfield chemical additive used for oil-water separation in petroleum extraction fluids. It achieves oil-water separation by...read more -
![Anionic Flocculant]()
Anionic FlocculantA high-performance anionic flocculant ZX-D3-03 designed for efficient solid-liquid separation in oilfield wastewater and industrial water treatment systems. With strong adsorption and bridging...read more -
![Oxalkylated Resin Demulsifier]()
Oxalkylated Resin DemulsifierOxalkylated Resin Demulsifier ZX-D2-08 effectively breaks oil-water emulsions in oilfield applications. Enhance separation efficiency and reduce operational downtime with our high-performance...read more -
![Demulsifier]()
DemulsifierThe main function of desalting demulsifier ZX-D3-01 is to achieve desalination and dehydration of crude oil by disrupting the emulsified state of oil and water and promoting the separation of...read more -
![Desalting Demulsifier Water/oil Soluble Type]()
Desalting Demulsifier Water/oil Soluble TypeOur Water/Oil Soluble Desalting Demulsifier ZX-D1-01 is designed to break emulsions and separate water from crude oil during the refining process. By enhancing oil purity and reducing salt...read more -
![Concentrated Demulsifier]()
Concentrated DemulsifierConcentrated demulsifier ZX-D2-07 is a cross-link PO/EO block polymer dissolved in a mixture of high boiling hydrocarbons. Concentrated Demulsifier ZX-D2-07 is a chemical additive mainly used to...read more -
![Demulsifier for Top Oil]()
Demulsifier for Top OilDemulsifier for Top Oil ZX-D1-04 has an RSN of 6.5 and is 100% active. Used as a secondary component, it is very good for treating the top oil. It is a chemical treatment agent used in crude oil...read more -
![Low-temperature resistant Demulsifier]()
Low-temperature resistant DemulsifierCrude oil low-temperature demulsifier ZX-D2-06 is a chemical agent specifically designed for the decomposition of crude oil emulsions. It can achieve oil-water separation at low temperatures...read more -
![Demulsifier oil soluble type]()
Demulsifier oil soluble typeZX-D2-05 High efficiency demulsifier oil soluble type is a complete oil soluble demulsifier, which is a mixed formulation demulsifier of wetting agent and other surfactants. It has good surface...read more -
![Universal oil-soluble Demulsifier]()
Universal oil-soluble DemulsifierOur universal demulsifier ZX-D1-05 can quickly and effectively separate oil-water emulsions, ensuring smooth oilfield production and reducing downtime. Designed specifically for various oilfield...read more
Application of Demulsifier
Demulsifiers are widely applied in the oil and gas industry to address the issue of water-in-oil or oil-in-water emulsions that form during the extraction, storage, and transportation of crude oil and in the production of natural gas. These emulsions can cause several problems, such as reduced oil flow rates, increased viscosity, corrosion, and fouling of equipment. Here are the key applications of demulsifiers:
Crude Oil Production
In oil wells, water often mixes with the oil, creating a water-in-oil emulsion. Demulsifiers are added to the production stream to break the emulsion so that oil and water can be separated more effectively in separation vessels or tanks.
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Enhanced Oil Recovery (EOR)
Techniques like waterflooding introduce large volumes of water into the oil reservoir to push oil towards production wells. The resulting emulsions require demulsifiers to separate the water from the oil for disposal or reinjection.
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Storage and Transportation
Crude oil may form emulsions during storage or transportation in tanks or pipelines. Adding demulsifiers helps prevent these emulsions from forming or breaks them if they do form, maintaining the flow and preventing potential blockages.
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Refining Processes
In refineries, demulsifiers are used to treat feedstock crude oil to remove entrained water that can interfere with the distillation and other processing operations.
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Gas Processing
Natural gas streams can contain condensate and water, which can form emulsions. Demulsifiers are used to separate the water from the gas stream to protect downstream processing equipment and to recover valuable condensate.
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What is the Primary Function of a Demulsifier In Oil and Gas Production?
A demulsifier is a chemical additive used primarily in the oil and gas industry to separate emulsions of water and oil. During production, it is common for water to become entrained in the oil, forming a stable mixture or emulsion. This can occur naturally due to the geological conditions of the reservoir or as a result of enhanced oil recovery techniques such as waterflooding.
Emulsified water can hinder the refining process and reduce the quality of the crude oil products. It can also cause corrosion and fouling in pipelines and processing equipment, leading to increased maintenance costs and reduced efficiency.
The primary function of a demulsifier is to disrupt the emulsion, allowing the oil and water to coalesce into separate phases, which can then be easily separated. Demulsifiers typically work by reducing the interfacial tension between the oil and water droplets, providing a surface active agent that helps to break the emulsion. This allows for more efficient processing and transport of crude oil, minimizing waste and optimizing production.
The selection of a demulsifier depends on the characteristics of the emulsion, such as the type of crude oil, the salinity of the water, and the temperature at which separation occurs. Proper dosage and timing are critical for effective emulsion breaking. Demulsifiers are an essential part of the downstream processing of petroleum, ensuring that the oil and water are effectively separated before further refining and use.
Is Demulsifier a Surfactant?
Demulsifiers can be classified as surfactants when they contain a hydrophobic tail and a hydrophilic head, which is characteristic of surfactants. Surfactants are compounds that lower the surface tension between two liquids or between a liquid and a solid. In the context of oil and water emulsions, demulsifying surfactants function by adsorbing at the oil-water interface, which reduces the interfacial tension and facilitates the coalescence of the emulsified droplets, allowing for their separation.
However, not all demulsifiers are surfactants. Some demulsifiers act through mechanisms that do not involve altering surface tensions. These can include polymers that increase the viscosity of the continuous phase, which can help in the separation of droplets, or molecules that complex with emulsifying agents, thereby destabilizing the emulsion. Therefore, while many demulsifiers are surfactants, the term "demulsifier" is not synonymous with "surfactant." It refers to any chemical that can be used to break emulsions, whether it functions through surface tension reduction or other mechanisms.
A demulsifier chemically breaks emulsions in produced water by disrupting the interfacial tension between the oil droplets and the water phase. The process involves several steps:
Adsorption: When a demulsifier is introduced into the emulsion, it selectively adsorbs onto the surface of the oil droplets. This occurs because the chemical structure of the demulsifier is designed to be amphiphilic, meaning it has both hydrophilic (water-attracting) and hydrophobic (oil-attracting) parts.
Reduction of Interfacial Tension: The adsorbed demulsifier molecules alter the surface properties of the oil droplets, reducing the interfacial tension between the oil and water phases. This reduction in tension makes it easier for the two liquids to separate.
Emulsion Destabilization
As the interfacial tension decreases, the stability of the emulsion is compromised. The demulsifier molecules act as bridges between the oil droplets and the water, weakening the emulsion structure.
Coalescence
With the destabilization of the emulsion, the droplets start to come closer together and merge, a process known as coalescence. This leads to larger oil globules that are more easily separated from the water due to their increased size.
Settling and Separation
The larger oil droplets formed through coalescence will have a higher density compared to the surrounding water. As a result, they will settle faster, facilitating gravity separation or enabling more efficient removal through mechanical separation equipment such as decanters or hydrocyclones.
Can Demulsifiers Be Used on Both Oil-In-Water and Water-in-Oil Emulsions?
Demulsifiers are designed to be effective on both oil-in-water and water-in-oil emulsions. The choice of demulsifier depends on the specific characteristics of the emulsion, including the composition of the oil and water phases, the nature of the emulsifying agents, and the conditions under which the emulsion forms and exists.
For oil-in-water emulsions, demulsifiers typically function by reducing the surface tension at the oil/water interface, promoting the coalescence of oil droplets so they can be separated from the water phase. These demulsifiers often contain surfactants that adsorb onto the oil droplets, lowering the interfacial tension.
In the case of water-in-oil emulsions, demulsifiers work similarly by reducing the interfacial tension, but they are tailored to adsorb preferentially onto the water droplets. This facilitates the aggregation and coalescence of the water droplets, allowing them to separate from the oil phase.
Chemical companies often provide demulsifiers that are versatile and can be effective on both types of emulsions. The effectiveness of a demulsifier is highly dependent on its ability to interact with the interfaces of the emulsion and overcome the forces that stabilize the emulsified state.
To ensure optimal performance, the selection of a demulsifier is usually preceded by laboratory testing to determine the most suitable agent for a particular emulsion. Factors such as pH, temperature, salinity, and the presence of other chemicals in the system are considered to tailor the demulsifier to the specific application.
What are the Typical Active Ingredients Found in Demulsifiers?
Typical active ingredients found in demulsifiers include a variety of chemical compounds that are designed to reduce the interfacial tension between oil and water, thereby facilitating the breakup of emulsions. These ingredients often belong to the following categories:
Anionic Surfactants
These are water-soluble surfactants that possess a negative charge. They are commonly used in demulsifiers because of their ability to adsorb onto the oil droplet surface and reduce surface tension. Sodium dodecylbenzenesulfonate (SDBS) is an example of an anionic surfactant.
Nonionic Surfactants
These surfactants do not have a charge in their ionic form and are widely used in demulsifiers due to their compatibility with a broad range of conditions. They are typically based on polyethylene oxide (PEO) chains and can be modified to adjust their hydrophilic-lipophilic balance (HLB). Ethoxylated alcohols and alkylphenols are examples of nonionic surfactants.
Cationic Surfactants
These are positively charged surfactants that can also be effective demulsifying agents. They are particularly useful in applications where emulsions are stabilized by negatively charged interfaces. Quaternary ammonium salts are common cationic surfactants.
Alkaline Materials
These substances, such as sodium hydroxide (NaOH) or ammonia, can increase the pH of the solution, which can promote demulsification by altering the electrical charges at the oil-water interface.
Polymers
Certain high molecular weight polymers can act as demulsifiers by providing a protective layer around the oil droplets or by creating a network that can bridge between droplets, promoting coalescence.
Corrosion Inhibitors
While not directly acting as demulsifying agents, these compounds are sometimes included in formulations to protect metal surfaces from degradation during the emulsion breaking process.
Yes, there are several environmental considerations when selecting a demulsifier:
Biodegradability: It is important to choose demulsifiers that are readily biodegradable to minimize their persistence in the environment. Demulsifiers that break down quickly reduce the risk of long-term ecological impact.
Toxicity: The demulsifier should have low toxicity to aquatic life to avoid harming ecosystems when produced water is discharged into water bodies.
Bioaccumulation Potential: Demulsifiers with a low potential for bioaccumulation are preferred to prevent the accumulation of chemicals in the food chain and wildlife.
Environmental Regulations: Compliance with local, national, and international environmental regulations is crucial. This includes understanding the legal requirements for the use and discharge of chemicals in produced water.
Impact on Reuse and Disposal: The demulsifier should not adversely affect the reuse of treated water or make disposal processes more complex or environmentally harmful.
Eco-Labeling and Certification: Some demulsifiers may be certified by eco-label programs that indicate they meet certain environmental standards, which can be a guiding factor in selection.
Green Chemistry Principles: Considering green chemistry principles in the design and selection of demulsifiers can lead to more sustainable choices that reduce hazardous substances and energy consumption.
End-of-Life Management: Ensuring there is a plan for managing the demulsifier at the end of its lifecycle, including proper disposal or recycling options, helps minimize environmental impact.
Risk Assessment: Conducting a thorough risk assessment of the demulsifier's potential environmental impacts can inform decisions about its suitability for use.
By taking these factors into account, operators can select demulsifiers that effectively address their operational needs while minimizing the environmental footprint.
How do the Molecular Weights and Structures of Demulsifiers Influence Their Effectiveness?
The molecular weights and structures of demulsifiers play a critical role in determining their effectiveness. The molecular structure affects the interaction of the demulsifier with the oil and water interfaces, influencing the ability to reduce interfacial tension and promote droplet coalescence.
Molecular Weight:
● Higher molecular weight demulsifiers generally have longer hydrophobic chains and can adsorb more densely at the interface, which can improve demulsification by enhancing the stability of the formed oil droplets and reducing the chance of re-emulsification.
● However, very high molecular weights can lead to reduced solubility and slower kinetics of adsorption, potentially reducing the overall efficiency.
Hydrophobic and Hydrophilic Balance:
● The effectiveness of a demulsifier is largely determined by the balance between its hydrophobic and hydrophilic parts. This balance, often referred to as the HLB (hydrophilic-lipophilic balance), should match the characteristics of the emulsion.
● For oil-in-water emulsions, a higher HLB value is generally required, indicating a stronger hydrophilic component to adsorb onto the oil droplets.
● Conversely, for water-in-oil emulsions, a lower HLB value is needed, suggesting a more hydrophobic demulsifier to adsorb onto the water droplets.
Surface Activity:
● The demulsifier's ability to reduce interfacial tension is directly related to its surface activity. Molecules that can spread easily across the oil-water interface will be more effective at reducing tension.
● Molecular weight and structure affect how readily a demulsifier can orient itself at the interface, thus influencing its surface activity.
Thermodynamic Compatibility:
● The demulsifier must be thermodynamically compatible with the emulsion system to effectively reduce the interfacial tension. The molecular structure should allow for favorable interactions with the emulsion components.
Solubility:
● Solubility in the aqueous and oil phases is crucial for demulsifiers to reach and adsorb at the interface. Molecular structure impacts solubility, with a compromise often needed between solubility and surface activity.
Kinetics of Adsorption:
● The rate at which the demulsifier can adsorb at the interface is influenced by its molecular structure. Faster adsorption can lead to quicker demulsification.
Considering all these factors, the design of demulsifiers involves a fine balance between achieving the right HLB, ensuring good surface activity, maintaining appropriate solubility, and optimizing the kinetics of adsorption. The molecular structure of a demulsifier must be carefully selected to suit the specific characteristics of the emulsion being treated.
What are the Safety Precautions and Handling Recommendations For Demulsifiers ?
Demulsifiers, which are chemicals used to break emulsions in oil and water systems, must be handled carefully to ensure operator safety and environmental protection. Here are some safety precautions and handling recommendations:
Personal Protective Equipment (PPE): Always wear appropriate PPE when handling demulsifiers. This includes gloves, safety goggles, long-sleeve shirts, and sometimes face shields or respirators, depending on the chemical's properties and potential hazards.
Material Safety Data Sheets (MSDS): Before using any demulsifier, review the MSDS to understand the chemical's properties, hazards, and recommended exposure limits.
Proper Storage: Store demulsifiers in their original containers, labeled clearly, and kept away from sources of ignition, heat, and direct sunlight. Ensure the storage area is well-ventilated and secure.
Disposal: Follow proper waste disposal procedures as outlined in the MSDS and local regulations. Do not discharge demulsifiers into waterways or sewage systems.
Handling: When transferring demulsifiers, use closed systems to prevent spills and exposure. In case of spills, follow spill response procedures and use absorbent materials to contain the leak.
Emergency Showers and Eye Washes: Ensure that emergency showers and eye washes are readily accessible in case of accidental contact.
Training: Provide training to all personnel who handle demulsifiers, covering proper handling techniques, the risks associated with the chemicals, and emergency response procedures.
Respiratory Protection: If there is a risk of inhaling dust or vapors, use appropriate respiratory protection.
Avoid Contamination: Do not let demulsifiers come into contact with food or drink. Wash hands before eating, drinking, or smoking.
Medical Attention: In case of skin or eye exposure, flush the affected area immediately with copious amounts of water for at least 15 minutes. Seek medical attention if symptoms persist or if there is any doubt about the severity of exposure.
By adhering to these precautions and recommendations, operators can minimize the risks associated with handling demulsifiers and maintain a safe working environment. Always refer to the specific MSDS for detailed safety information regarding the demulsifier in use.
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