Dry rendering of fat

Dry rendering is a widely used method in the animal by-products industry for the extraction of fats from animal tissues. Unlike wet rendering, this process does not use water or steam. It can be suitable for certain types of raw materials and final uses.

Dry rendering involves heating raw materials to high temperatures to separate fat from proteins and moisture content. It is effective for certain applications, but wet rendering offers significant advantages in terms of product quality and higher yield. (PEPITO uses advanced wet rendering techniques to ensure efficient and sustainable extraction of fats and proteins from animal by-products.)

Key aspects of the dry rendering method

Process description:

• Heating: Raw animal by-products such as fatty tissue are exposed to high temperatures in large vessels or boilers. This heat breaks down the cellular structure and releases the fat.

• Separation: As the temperature increases, the fat separates from the protein solids and moisture. The fat rises to the surface, where it can be collected or drained away.

• Refining: The collected fat is further refined to remove any remaining impurities. This ensures a high-quality final product.

• Drying: The remaining solid materials, which include proteins and bones, are dried to remove moisture. This leads to the production of processed animal protein.

Dry vs wet rendering, or the disadvantages of dry rendering:

• Lower product quality: Dry-rendered fats often have a darker color and stronger odor compared to wet-rendered fats. This may require additional refining in order to meet quality standards.

• Insufficient fat extraction: Dry rendering may not extract as much fat from raw materials as wet rendering, which can lead to lower yields.

• Release of odor: The high temperatures used in dry rendering can create strong odors, which then requires effective odor control measures.

Quality and properties:

• Odor and color: Fats obtained from dry rendering may have a more intense color and odor than those produced using wet rendering, which can be resolved by additional refining.

Considerations:

• Temperature control: Accurate temperature control is essential to avoid burning or spoiling the fat, which could affect quality.

• Odor control: This process can produce strong odors, which require effective measures to control them.