Dingsheng Machine: Innovative Refining and Dewaxing Technology for High-Quality Oils
Date:Nov 1st, 2024
Dewaxing is an essential process in oil refining, enabling the removal of high-melting-point waxes from liquid oils. By utilizing advanced forced cooling methods, the wax crystallizes and separates from the oil. This is followed by filtration or centrifugal separation. Dewaxing is critical for oils like corn oil, rice bran oil, sunflower seed oil, and cottonseed oil, ensuring superior clarity and quality.
Key Features of the Dewaxing Process
The conventional dewaxing method involves freezing the oil and mechanically separating the crystallized wax without additional aids.
Common separation methods include pressure filtration, vacuum filtration, and centrifugal separation.
Crystallization and Cooling:
Oil is cooled in a chamber at 0–4°C for 72 hours, gradually reaching 6–10°C.
Cooling rates are controlled to optimize crystallization:
First 24 hours: ~2°C/hour
Middle 24 hours: ~0.5°C/hour
Final 24 hours: ~1–2°C/hour
Filtration:
Wax crystals are separated in a 15–18°C filtration chamber using bag filters made from polyester, pure cotton, or cotton fabric. Filtration speed varies based on material: polyester > pure cotton > cotton fabric.
Modern refineries frequently employ cooling, crystallization, and plate filtration systems for efficient separation. For oils with minimal wax content, such as sunflower oil, a two-day cooling at 10–15°C followed by plate filtration achieves excellent results, reducing wax content to just 10 mg/kg.
Key Equipment in Dewaxing Process
Cooling Systems: Ensure uniform and controlled cooling rates.
Heat Exchangers: Facilitate precise temperature adjustments.
Crystallization Tanks: Enable the formation of wax crystals.
Wax Maturation Tanks: Allow crystals to grow for effective separation.
Filtration/Centrifugal Separation Units: Achieve high-efficiency wax removal.
Special Considerations for Optimal Dewaxing
1, Preheating the oil before cooling ensures that any pre-existing wax is fully dissolved, enhancing dewaxing efficiency.
2, Cooling should be gradual and uniform to promote effective wax crystallization.
3, Wax crystals require 12–16 hours of maturation to enlarge sufficiently for filtration.
4, Continuous operations can be achieved using dual plate filtration systems.
Difference Between Dewaxing and Fractionation
While dewaxing improves oil taste and quality by removing wax, fractionation focuses on separating solid fats and liquid oils for specific applications. For instance, fractionation of coconut oil produces medium-chain fatty acids beneficial for weight management and health.
Dingsheng Machine stands out with cutting-edge technology, robust equipment design, and unparalleled expertise in oil refining. Our comprehensive solutions ensure efficient, high-quality dewaxing processes tailored to diverse needs. We prioritize customer satisfaction with reliable after-sales support, including technical guidance, training, and maintenance services.
Contact Us for Professional Dewaxing Solutions
Website: www.dsoilpress.com
Phone: +86-159 3716 3029
Email: company@dingmachinery.com
Key Features of the Dewaxing Process
The conventional dewaxing method involves freezing the oil and mechanically separating the crystallized wax without additional aids.
Common separation methods include pressure filtration, vacuum filtration, and centrifugal separation.
Crystallization and Cooling:
Oil is cooled in a chamber at 0–4°C for 72 hours, gradually reaching 6–10°C.
Cooling rates are controlled to optimize crystallization:
First 24 hours: ~2°C/hour
Middle 24 hours: ~0.5°C/hour
Final 24 hours: ~1–2°C/hour
Filtration:
Wax crystals are separated in a 15–18°C filtration chamber using bag filters made from polyester, pure cotton, or cotton fabric. Filtration speed varies based on material: polyester > pure cotton > cotton fabric.
Modern refineries frequently employ cooling, crystallization, and plate filtration systems for efficient separation. For oils with minimal wax content, such as sunflower oil, a two-day cooling at 10–15°C followed by plate filtration achieves excellent results, reducing wax content to just 10 mg/kg.
Key Equipment in Dewaxing Process
Cooling Systems: Ensure uniform and controlled cooling rates.
Heat Exchangers: Facilitate precise temperature adjustments.
Crystallization Tanks: Enable the formation of wax crystals.
Wax Maturation Tanks: Allow crystals to grow for effective separation.
Filtration/Centrifugal Separation Units: Achieve high-efficiency wax removal.
Special Considerations for Optimal Dewaxing
1, Preheating the oil before cooling ensures that any pre-existing wax is fully dissolved, enhancing dewaxing efficiency.
2, Cooling should be gradual and uniform to promote effective wax crystallization.
3, Wax crystals require 12–16 hours of maturation to enlarge sufficiently for filtration.
4, Continuous operations can be achieved using dual plate filtration systems.
Difference Between Dewaxing and Fractionation
While dewaxing improves oil taste and quality by removing wax, fractionation focuses on separating solid fats and liquid oils for specific applications. For instance, fractionation of coconut oil produces medium-chain fatty acids beneficial for weight management and health.
Dingsheng Machine stands out with cutting-edge technology, robust equipment design, and unparalleled expertise in oil refining. Our comprehensive solutions ensure efficient, high-quality dewaxing processes tailored to diverse needs. We prioritize customer satisfaction with reliable after-sales support, including technical guidance, training, and maintenance services.
Contact Us for Professional Dewaxing Solutions
Website: www.dsoilpress.com
Phone: +86-159 3716 3029
Email: company@dingmachinery.com
Share: