Diesel decoagulant: principle, application and development prospect

Abstract
Diesel point depressant is a kind of additive used to reduce the freezing point and cold filter point of diesel, which is widely used in cold areas to improve the low temperature flow performance of diesel. In this paper, the principle, type, action mechanism, application status and future development direction of diesel point depressant are introduced in detail.

introduction
Diesel oil is an important energy source, and its performance directly affects the efficiency and reliability of the engine. However, at low temperatures, the wax crystals in diesel are easy to precipitate, resulting in increased fuel viscosity and even blocking fuel filters and pipelines. In order to solve this problem, diesel decoagulant came into being. By changing the formation and distribution of wax crystals in diesel oil, they reduce the freezing point and cold filter point of diesel oil to ensure its normal flow in low temperature environment.

First, the basic principle of diesel decoagulant
Diesel decoagulant mainly improves the low temperature fluidity of diesel through the following mechanisms:

Crystal improvement: change the shape of the wax crystal, so that it is not easy to aggregate and grow.
Dispersion: Dispersion of wax crystals to prevent the formation of large particles, thereby reducing the viscosity of diesel oil.
Crystal nucleus formation: Provide a large number of crystal nuclei, and promote the wax crystal to form a large number of tiny crystals at low temperatures to avoid the generation of large crystals.
Second, the type of diesel decoagulant
Diesel decoagulants can be mainly divided into the following categories according to their chemical structure and mechanism of action:

Polymer-based point depressants, such as ethylene-vinyl acetate copolymer (EVA), reduce the freezing point of diesel oil by changing the shape and distribution of wax crystals.
Surface active dosage forms: such as nonylphenol polyoxyethylene ether (NP-10), by adsorption on the surface of the wax crystal, prevent its aggregation.
Organometallic compound type coagulant: such as organometallic compounds containing zinc and calcium, which change the growth mode of wax crystals by forming complex complexes.
Third, the mechanism of diesel decoagulant
Different types of diesel decoagulants improve the low temperature performance of diesel through different mechanisms of action:

Polymer type point depressant: By interacting with the surface of the wax crystal, the growth direction of the crystal is changed, so that it forms smaller and more uniform particles.
Surfactant depressant: By forming an adsorption film on the surface of the wax crystal, it prevents the further aggregation and growth of the crystal.
Organometallic compound type coagulant: By forming a complex with the wax crystal, changing the internal structure of the crystal, so that it is not easy to precipitate at low temperature.
Fourth, the application status of diesel decoagulant
Diesel point depressant is widely used in diesel fuel in cold regions of the world. Here are some examples of its use in different regions and environments:

Europe: Due to the cold winter in Europe, diesel decoagulants are widely used in transportation and heating diesel.
North America: The cold climate in North America has also led to the widespread use of diesel decoagulants in automotive and industrial diesel.
Asia: In cold regions such as China and Russia, diesel point depressants are widely used in the fuel of agricultural machinery and construction vehicles.
Fifth, the development trend of diesel decoagulant
With the improvement of environmental protection requirements and the continuous development of new technologies, the research and application of diesel decoagulants also show the following major development trends:

Green environmental protection: Research and development of low toxicity, non-toxic and good biodegradability of diesel decoagulants to reduce the impact on the environment.
High efficiency and multi-function: The development of a variety of functions of the composite point reducer, not only can reduce the freezing point of diesel, but also improve its lubricity, cleanliness and other properties.
Intelligent application: The use of intelligent control technology, according to different environmental temperature and diesel quality, automatically adjust the amount of decoagulant addition, to achieve precise control.

6. Experimental study on diesel decoagulant
7. Experimental research on polymer type point depressant
   1.1 Experimental purpose

To verify the effectiveness of ethylene-vinyl acetate copolymer (EVA) as a point reducing agent for diesel oil.

1.2 Experimental Materials

Diesel sample
EVA decoagulant
Low temperature freezer
viscometer
1.3 Experimental methods

The diesel sample was divided into several equal parts, and different concentrations of EVA were added respectively.
Drop the sample to a set temperature (e.g. -20°C) in a cryogenic freezer.
The viscosity change of the diesel sample is measured at regular intervals (such as 30 minutes).
1.4 Experimental Results

The results of viscosimeter measurement show that the viscosity of the diesel sample with EVA is obviously lower than that without EVA at low temperature, which indicates that Eva can effectively reduce the viscosity of diesel at low temperature.

1.5 Experimental Conclusion

EVA can significantly reduce the low temperature viscosity of diesel oil and improve its low temperature fluidity, which verifies its effectiveness as a diesel oil point lowering agent.

2. Experimental study of surface active dosage type coagulant
   2.1 Experimental purpose

The anticoagulation effect of nonylphenol polyoxyethylene ether (NP-10) in diesel oil was studied.

2.2 Experimental Materials

Diesel sample
NP-10 decoagulant
Low temperature freezer
microscope
2.3 Experimental methods

The diesel oil sample was divided into several equal parts, and different concentrations of NP-10 coagulant were added respectively.
Drop the sample to a set temperature (e.g. -20°C) in a cryogenic freezer.
Use a microscope to observe and record the formation and distribution of wax crystals.
2.4 Experimental results

Under microscope, the number and size of wax crystals in the diesel samples with NP-10 are obviously smaller than those without NP-10, which indicates that NP-10 can effectively inhibit the formation and aggregation of wax crystals.

2.5 Experimental Conclusions

By changing the formation and distribution of wax crystals, NP-10 can effectively reduce the freezing point and cold filter point of diesel oil, which proves its potential as a diesel oil point depressant.

7. Practical application cases of diesel decoagulant
8. Application of a European logistics company
   1.1 Company Background

The logistics company is located in the northern region of Europe, where diesel vehicles are often affected by fuel problems in the cold winter.

1.2 Problem Description

The low temperature in winter leads to the precipitation of wax crystals in diesel fuel, blocking fuel filters and pipelines, and affecting the normal operation of vehicles.

1.3 Solution

The company decided to add EVA polymer point depressant to diesel to improve the low temperature fluidity of diesel.

1.4 Application Effect

During a winter period of use, the vehicle’s start-up and operation in a low temperature environment is significantly improved, the blockage of fuel filters and pipelines is significantly reduced, and the transportation efficiency is improved.

1.5 Economic Benefits

By using diesel point depressants, the company has reduced vehicle maintenance and downtime, reducing overall transportation costs by about 15 percent.

2. Application of a North American agricultural machinery company
   2.1 Company Background

The company is located in the central region of North America, where winter temperatures are colder and agricultural machinery often faces problems with low diesel fuel liquidity.

2.2 Problem Description

At low temperature, solidification and viscosity increase of diesel fuel make it difficult to start agricultural machinery and affect normal operation.

2.3 Solution

The company uses NP-10 surfactant decoagulant, which is regularly added to diesel fuel.

2.4 Application Effect

In a winter use, the starting performance of agricultural machinery in a low temperature environment is significantly improved, and the low temperature fluidity of diesel fuel is greatly improved.

2.5 Economic Benefits

Through the use of diesel point depressants, the company has improved the operational efficiency of agricultural machinery, reduced fuel-related failure rates and maintenance costs, and improved the overall economic efficiency by about 12%.

Viii. Future research direction of diesel decoagulant
Development of new point depressants: Research and development of more efficient and environmentally friendly point depressants, especially for the application of bio-based materials and nanomaterials.
Multifunctional compound point depressant: The development of compound point depressant with multiple functions can not only reduce the freezing point of diesel, but also improve its lubricity, cleanliness and other properties.
Intelligent control technology: The application of intelligent control technology to achieve the precise addition of diesel coagulant, maximize its use effect.
Environmental friendly coagulant: With the improvement of environmental protection requirements, the development of low-toxicity, non-toxic and good biodegradable diesel coagulant will be an important research direction in the future.
Ix. Conclusion
Diesel decoagulant plays an important role in improving the low temperature performance of diesel oil. With the continuous progress of technology and the change of market demand, its application prospect will be more broad. Future research should focus on the development of efficient and environmentally friendly coagulants to meet the needs of different regions and environments, and provide a strong guarantee for the wide application of diesel.