Dingsheng Machine’s Advanced Oil Dewaxing Solutions for Optimal Purity
Date:Oct 28th, 2024
Oil dewaxing is a critical process that removes high-melting-point waxes from liquid oils through forced cooling. This separation is achieved by crystallizing waxes and then using filtration or centrifugal separation to eliminate them. Oils such as corn oil, rice bran oil, sunflower seed oil, and cottonseed oil typically require dewaxing to improve quality and clarity.
Key Features of Oil Dewaxing Technology
1. Conventional Dewaxing Process
Conventional dewaxing involves freezing the oil, followed by mechanical separation of waxes without additional aids. Common separation methods include pressure filtration, vacuum filtration, and centrifugal separation. This basic process crystallizes and filters oils in a simple, cost-effective way:
Crystallization: Oils are cooled in a chamber at 0-4°C over 72 hours until they reach 6-10°C. The cooling rate varies, averaging 2°C per hour initially and slowing down in later stages.
Filtration: The oil is then transferred to a 15-18°C filtration room where it undergoes bag filtration for 10-12 hours to separate wax crystals from the oil. Available filtration materials include dacron, cotton, and muslin, with dacron being the fastest.
In most refineries, cooling and crystallization are paired with plate filters to achieve effective dewaxing. For low-wax oils like sunflower oil, cooling to 10-15°C for two days followed by plate filtration can reduce wax content to just 10 mg/kg in the final oil.
2. Major Dewaxing Equipment
Cooling System
Heat Exchanger
Crystallization Tank
Aging Tank
Filtration/Centrifugation
Important Dewaxing Considerations
Pre-heating: Before cooling, the oil should be pre-heated to dissolve any wax that may have precipitated at room temperature.
Consistent Cooling Rate: A steady, gradual cooling rate enhances dewaxing results.
Crystal Maturation: After 72 hours of cooling, wax crystals need to mature for 12-16 hours for optimal separation.
Continuous Filtration: Dual plate filters can be used for continuous filtration, ensuring uninterrupted production.
Dewaxing vs. Fractionation
While dewaxing and fractionation share similar principles, their goals differ. Dewaxing improves taste and clarity by removing wax, while fractionation isolates solid fats and liquid oils based on glyceride melting points for modified product characteristics. For example, fractionated coconut oil with medium-chain fatty acids, like caprylic (C8) and capric acid (C10), is valued for health benefits such as weight management.
Dingsheng Machine offers comprehensive solutions for oil dewaxing with state-of-the-art equipment, ensuring high-quality, clear oils with minimal wax content.
For detailed consultation, contact Dingsheng Machine:
Website: www.dsoilpress.com
Phone: +86-159 3716 3029
Email: company@dingmachinery.com
Key Features of Oil Dewaxing Technology
1. Conventional Dewaxing Process
Conventional dewaxing involves freezing the oil, followed by mechanical separation of waxes without additional aids. Common separation methods include pressure filtration, vacuum filtration, and centrifugal separation. This basic process crystallizes and filters oils in a simple, cost-effective way:
Crystallization: Oils are cooled in a chamber at 0-4°C over 72 hours until they reach 6-10°C. The cooling rate varies, averaging 2°C per hour initially and slowing down in later stages.
Filtration: The oil is then transferred to a 15-18°C filtration room where it undergoes bag filtration for 10-12 hours to separate wax crystals from the oil. Available filtration materials include dacron, cotton, and muslin, with dacron being the fastest.
In most refineries, cooling and crystallization are paired with plate filters to achieve effective dewaxing. For low-wax oils like sunflower oil, cooling to 10-15°C for two days followed by plate filtration can reduce wax content to just 10 mg/kg in the final oil.
2. Major Dewaxing Equipment
Cooling System
Heat Exchanger
Crystallization Tank
Aging Tank
Filtration/Centrifugation
Important Dewaxing Considerations
Pre-heating: Before cooling, the oil should be pre-heated to dissolve any wax that may have precipitated at room temperature.
Consistent Cooling Rate: A steady, gradual cooling rate enhances dewaxing results.
Crystal Maturation: After 72 hours of cooling, wax crystals need to mature for 12-16 hours for optimal separation.
Continuous Filtration: Dual plate filters can be used for continuous filtration, ensuring uninterrupted production.
Dewaxing vs. Fractionation
While dewaxing and fractionation share similar principles, their goals differ. Dewaxing improves taste and clarity by removing wax, while fractionation isolates solid fats and liquid oils based on glyceride melting points for modified product characteristics. For example, fractionated coconut oil with medium-chain fatty acids, like caprylic (C8) and capric acid (C10), is valued for health benefits such as weight management.
Dingsheng Machine offers comprehensive solutions for oil dewaxing with state-of-the-art equipment, ensuring high-quality, clear oils with minimal wax content.
For detailed consultation, contact Dingsheng Machine:
Website: www.dsoilpress.com
Phone: +86-159 3716 3029
Email: company@dingmachinery.com
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