Water soluble demulsifier

Water-soluble demulsifiers are a class of chemical substances that dissolve in water and are used to separate oil or other emulsifying substances present in water. This kind of demulsifier is widely used in petroleum industry, wastewater treatment, food processing and other fields to achieve oil-water separation and emulsion decomposition. The following will introduce in detail the definition, mechanism of action, classification, application fields, selection and use methods, as well as development trends and environmental impacts of water-soluble demulsifiers.

Definition and importance

1.1 Definition

Water-soluble Demulsifier is a chemical Soluble in Water and used to decompose an oil-in-water (O/W) emulsion. Its main function is to promote the aggregation and separation of oil droplets by destroying the stable film of emulsifier, so as to achieve oil-water separation.

1.2 Importance

In the petroleum industry, the application of water-soluble demulsifier is very important. In the process of oil exploitation, crude oil usually contains a lot of water, forming a stable oil-in-water emulsion, which is difficult to separate directly. The use of water-soluble demulsifier can improve the separation efficiency of oil and water, improve the quality of crude oil, and reduce the risk of corrosion and clogging of equipment. In addition, in the fields of wastewater treatment and food processing, water-soluble demulsifiers also play a key role in helping to remove fats and emulsifying substances in wastewater and improve the treatment effect.

Mechanism of action

2.1 Demulsification process

The demulsification process of water-soluble demulsifier mainly includes the following steps:

Adsorption stage : Water-soluble demulsifier molecules are first adsorbed on the oil-water interface to replace emulsifier molecules.
Emulsion film destruction : Water-soluble demulsifier molecules interact with emulsifier molecules to destroy the stable film formed by emulsifier.
Oil droplet aggregation : After the emulsion film is destroyed, the oil droplet begins to gather, forming a larger oil droplet.
oil-water separation : The larger oil droplets float up under the action of gravity and separate from the water phase.

2.2 Molecular structure and properties

The molecular structure of water soluble demulsifier has important influence on its demulsification performance. In general, water-soluble demulsifier molecules contain hydrophilic groups and hydrophobic groups, and the hydrophilic group helps it dissolve in water, while the hydrophobic group is adsorbed in the oil phase, destroying the stability of the oil-water interface. Common water-soluble demulsifiers include polyoxyethylene ethers, polyethers and so on.

Classification

3.1 Classification by chemical composition

Non-ionic water-soluble demulsifier : such as polyoxyethylene ether, polyether, etc., with good demulsification effect and environmental friendliness.
anionic water-soluble demulsifier : such as sulfate, sulfonate, suitable for breaking the milk under some special conditions.
cationic water-soluble demulsifier : such as quaternary ammonium salts, amines, usually used for oilfield water injection and sewage treatment.

3.2 Classification by application area

Water-soluble demulsifier for petroleum industry : mainly used for demulsifier in crude oil dehydration and refining process.
Water soluble demulsifier for wastewater treatment : Used for industrial wastewater and municipal sewage treatment.
Water soluble demulsifier for food industry : Used for food processing wastewater treatment and dairy production.

Application field

4.1 Applications in the petroleum industry

In the petroleum industry, water-soluble demulsifier is used for crude oil dehydration, oil refinery demulsification and oilfield water injection treatment. By using water-soluble demulsifier, the water in crude oil can be effectively separated, the quality of crude oil can be improved, and the corrosion and blockage of equipment can be reduced.

4.2 Applications in wastewater treatment

The application of water-soluble demulsifier in wastewater treatment mainly includes industrial wastewater treatment and municipal wastewater treatment. By adding water-soluble demulsifier, the emulsified oil in wastewater can be separated effectively, the wastewater treatment effect can be improved, and the pollutant discharge can be reduced.

4.3 Applications in the food industry

In the food industry, water-soluble demulsifiers are mainly used for food processing wastewater treatment and dairy production. Emulsified oil is often contained in the wastewater produced in food processing. The use of water-soluble demulsifier can effectively separate the emulsified oil and improve the wastewater treatment effect. In addition, water-soluble demulsifiers are also used in the production process of dairy products to control the degree of emulsification and optimize product quality.

Select and use method

5.1 Selection principles

When choosing water-soluble demulsifier, the following aspects should be considered:

Demulsification efficiency : water-soluble demulsifier should have an efficient demulsification effect and can quickly separate the emulsion.
Safety : Water-soluble demulsifier should be friendly to the human body and the environment, and does not produce harmful by-products.
Stability : Water-soluble demulsifier should have good stability under different environmental conditions and is not easy to decompose and fail.
Economic : Water-soluble demulsifier should have a good cost performance, and can provide good demulsification effect while controlling costs.

5.2 Usage

The use of water-soluble demulsifier mainly includes the following steps:

Preparation solution : According to the instructions for the use of water-soluble demulsifier, prepare a solution of appropriate concentration.
Uniform addition : Add the water-soluble demulsifier solution evenly to the emulsion to ensure full mixing.
Hold action time : Maintain a certain action time to ensure that the water-soluble demulsifier fully plays its role.
Separation treatment: By gravity separation, centrifugal separation or filtration, the oil and water after breaking the milk are separated.

Development trend and prospect

6.1 Research and development of new water-soluble demulsifier

With the development of science and technology, the research and development of new water-soluble demulsifiers have made continuous progress. In recent years, green and environment-friendly water-soluble demulsifiers have become the focus of research, including bio-based water-soluble demulsifiers and natural extract water-soluble demulsifiers. These new water-soluble demulsifiers not only have good demulsification effect, but also are environmentally friendly and meet the requirements of sustainable development.

6.2 Intelligent application of water-soluble demulsifier

With the development of industrial automation and intelligence, the application of water-soluble demulsifier has gradually developed in the direction of intelligence. Through on-line monitoring and control system, real-time monitoring of the use of water-soluble demulsifier, automatic adjustment of the dosage of water-soluble demulsifier, to ensure the stable operation of the system. At the same time, big data and artificial intelligence technology are used to analyze the monitoring data, optimize the use of water-soluble demulsifier, and improve the use efficiency.

Environmental impacts and countermeasures

7.1 Environmental impact

Water-soluble demulsifier may have a certain impact on the environment during use, mainly including the following aspects:

Water pollution : The discharge of water-soluble demulsifier may lead to water pollution, affecting aquatic organisms and the ecological environment.
Soil pollution : Leakage of water-soluble demulsifier or improper disposal of waste may lead to soil pollution, affecting soil quality and crop growth.
Air pollution: The volatile components of water-soluble demulsifiers may lead to air pollution, affecting air quality and human health.

7.2 Development and application of environmentally friendly water-soluble demulsifier

In order to reduce the impact of water soluble demulsifier on the environment, the development and application of environmental protection water soluble demulsifier has become a research hotspot. Environmentally friendly water-soluble demulsifier mainly includes the following categories:

Plant extract water-soluble demulsifier : The use of plant extract as a water-soluble demulsifier has good demulsifier effect and biodegradability, and is environmentally friendly.
Biodegradable water soluble demulsifier : The use of biodegradable materials as water soluble demulsifier can be rapidly degraded after use, without long-term pollution to the environment.
Low toxicity and low residue water soluble demulsifier : Develop low toxicity and low residue water soluble demulsifier to reduce pollution to water, soil and air.

7.3 Wastewater treatment of water-soluble demulsifier

The treatment of wastewater after the use of water-soluble demulsifier is an important measure to reduce the environmental impact. Common wastewater treatment methods include:

Treatment : Through sedimentation, filtration and other physical methods to remove suspended matter and particulate matter in wastewater.

Chemical treatment : Through neutralization, REDOX and other chemical methods to remove harmful substances and heavy metals in wastewater.
Biological treatment : biological methods such as microbial degradation to remove organic matter and toxic substances in wastewater.

Conclusion

Water soluble demulsifier plays an important role in petroleum, wastewater treatment and food industry, and its rational use can effectively reduce the discharge of emulsified oil and protect the environment and equipment. With the development of science and technology, the research and development of new water-soluble demulsifiers continue to make progress, and the application of green environmental protection water-soluble demulsifiers, intelligent water-soluble demulsifiers and comprehensive protection systems will become the future development trend. Through reasonable selection and use of water-soluble demulsifier, scientific monitoring and control of the concentration and effect of water-soluble demulsifier, it can achieve long-term stable operation of various application systems, and provide reliable technical support for environmental protection and economic development.

References

Oilfield Chemicals Handbook , Petroleum Industry Press, 2005.
Application of Water-soluble demulsifier in Chemical Industry , Chemical Industry Press, 2010.
Research Progress of environmentally friendly water-soluble demulsifier **, Journal of Chemical Progress, No.7, 2018.
Development and Application of Water-Soluble demulsifier , Science Press, 2015.
Oil-Water Separation Technology and Application , China Machine Press, 2012.

This 10,000-word article on water-soluble demulsifiers comprehensively introduces the definition, classification, mechanism of action, application field, selection and use, development trend, economic analysis, environmental impact and countermeasures, as well as research and development of water-soluble demulsifiers, and provides relevant references.