Dewaxing & Winterization

Process Description

The process of crystallization of non glyceride components and long-chain high melting compounds is known as dewaxing and winterization respectively. Oils like sunflower oil and corn oil consist of non triglyceride  compounds whereas rice bran oil, cottonseed oil and hydrogenated soybean oil consist of long chain high melting components. During cold weather these components cause oil to become hazy upon storage. These components must be removed to ensure oil transparency. Dewaxing or winterization are a critical process of oil refining in cold weather regions.

The dewaxing or winterization process involves the cooling of oil to crystallize high melting compounds followed by filtration or centrifugation to separate crystallized mass from oils. Bleached or deodorized oil is first cooled through a series of heat exchangers and then fed to the crystallizers. Crystallizers are equipped with double-layered coils circulated with chilled water. Once crystals form, the oil is filtered through filters and sent for further processing.

Kumar offers dewaxing or winterization plants with different types of filters like horizontal pressure leaf filter, recessed plate filters and gravity filters.


Dewaxing is used for sunflower and corn oil while winterization is used for rice bran, hydrogenated soybean and cottonseed oil.

The Kumar Advantage
  • Specially designed VFD driven crystallizers for complete process control
  • Minimum utility consumption
  • Special double-layered coil crystallizers
  • Shell retraction filters for easy cleaning
  • Automatic cleaning filters for ease of operation
  • Multiple options for filters - plate and frame filter, horizontal pressure leaf filter, gravity filter and recessed plate filter