Low Temperature Waste Engine Oil Purification Technology

Traditional methods used in waste engine oil treatment were burdensome both economically and environmentally due to the high temperature requirement of up to 500 °C. 

With our new generation system, the purification process only takes place between 50–95 °C.

Waste Engine Oil Low-Temperature Refining System

Licensed Technical Application and Process Guidelines

The information provided below has been prepared to present the general application principles and technical framework of the waste engine oil refining system developed by Bartu Engine Oils.

Detailed formulations, specific ratios, and process optimization data are shared with licensed users within the scope of the licensing agreement.

The final performance of the system may vary depending on raw material quality, equipment specifications, environmental conditions, and operator practices.

1. Raw Material Preparation and Pre-Treatment

Collected waste engine oil is allowed to settle for a minimum of 48 hours in order to separate free water and coarse contaminants.

After settling, the upper layer of oil is carefully transferred without disturbing the sediment at the bottom.

The extracted oil is heated to approximately 60°C and passed through a staged pre-filtration process, gradually reducing filtration size from 50 microns to 10 microns.

Following pre-filtration, the oil is heated within the range of 95–110°C for a period depending on its moisture content. During this stage, controlled and intermittent mixing is applied to ensure effective dehydration.

2. Drying and Mixing Process

Once the dehydration stage is completed, the oil is transferred to the mixing tank.

Additives specified under the license agreement are introduced gradually and in a controlled manner using a mixer operating at 150–300 RPM.

The additives are applied in a defined sequence:

• First-stage additive is introduced and mixed for the required duration.

• Second-stage additive is added and mixing continues.
• Third-stage additive is applied to achieve full homogeneity.

After each stage, homogeneity is verified by sampling from upper and lower levels. Uniform color, odor, and consistency must be achieved before proceeding.

3. Settling and Resting Stage

Upon completion of mixing, the oil may be transferred to a separate settling tank or left in the same tank for sedimentation.

The settling period is typically around 24 hours, during which the mixture remains completely static.

For high-quality production, it is recommended that the clarified oil be rested for an additional minimum period of 48 hours.

Tank outlet points should be positioned at a suitable height to prevent sediment withdrawal.

4. Filtration and Final Purification

Before final filtration, the oil is reheated to approximately 60°C.

Filtration may be performed using the following systems:

• Cloth bag or sack filters (5 µm – 1 µm, 1–2 bar)

• Filter press systems (7–12 bar depending on plate configuration)

The formation of filter cake on filter cloths plays a critical role in achieving proper clarification.

Low and stable filtration pressure is recommended. Excessive pressure may negatively affect filtration efficiency and product quality.

5. Product Quality and Adjustments

When the process is properly applied, the final product generally falls within the mineral base oil category.

Common output grades include:

• SN150 (low viscosity)

• SN350 (medium viscosity)
• SN500 (high viscosity)

Final product classification is determined through measurements conducted after each production batch.

Viscosity adjustments may be performed using appropriate base oil blending methods when required.

Low-temperature refining preserves molecular structure and reduces additive consumption in final lubricant formulations.

6. Equipment and System Requirements

The mixing system is one of the most critical components of the process.

Mixers should be equipped with:

• Wave breakers (baffles)

• Appropriate impeller-type propellers
• Design based on static and mechanical calculations
• Tank geometry suitable for uniform circulation

Equipment dimensions and impeller configuration should be selected according to production capacity.

7. Quality Control and Batch Monitoring

Due to variations in raw materials, each production batch may exhibit different characteristics.

For this reason, the following checks are recommended after each batch:

• Viscosity measurement

• Moisture content verification
• Flash point evaluation
• Visual and odor inspection

These controls are essential for maintaining consistent production quality.

8. Safety and Occupational Health

Waste engine oil may contain flammable and volatile substances.

For this reason:

• Open flames must not be used

• Closed-system heating is recommended
• Personal protective equipment must be worn
• Adequate ventilation must be ensured

All applicable occupational safety regulations must be followed.

9. License Scope and Technical Support

This system is provided under license as proprietary know-how and process technology developed by Bartu Engine Oils.

Within the scope of the license, the following support services are provided:

• Application guidance

• Technical consultancy
• Installation support
• Initial production assistance
• Process optimization support

Detailed formulations and operating ratios are shared exclusively with licensed users.

10. General Evaluation

When the stated application principles, equipment requirements, and process sequence are followed accurately, the system is designed to achieve high efficiency and produce commercially valuable base oil.

Final results are directly related to operational discipline, equipment quality, and implementation accuracy.