Animal Oil Extraction Technique

Animal oil extraction equipment is designed for the extraction and refining of various animal fats, such as pork fat, beef and mutton fat, chicken and duck fat, ostrich oil, crocodile oil,etc. It can be configured according to different production scales and process requirements to ensure safe, efficient, and high-quality product output during the oil extraction process.

Technical flow:

Condensation recovery-Vacuum system-Tail gas recovery

                                ↑

Raw material-Grinding-Conveying-Vacuum smelting-Oil dregs separation

-Oil dregs-Pressing-Pressed cake                    ↓

                                      Crudeoil-Filtration-Finished oil

【Grinding Process】: This process utilizes heavy-duty gear-driven meat grinding equipment for the treatment of frozen and fresh materials. The raw materials are first processed through a grinder to achieve a granulated state. The purpose is to uniformly coarse grind the raw materials, reduce smelting time, facilitate material transportation, and ensure that the subsequent pressing section meets the requirements for the granularity of the feed particles. The crushed material is then lifted by a chain plate conveyor to the material distribution conveyor. The material distribution conveyor adopts a shaftless screw blade transmission design to ensure that the material does not stick or clog during the conveying process, thereby ensuring smooth feeding.

【Negative Pressure Smelting Process】: This process utilizes a horizontal smelting pot with a dual stirring structure and is suitable for various animal fat raw materials. The material distribution screw uniformly delivers the raw materials into the smelting pot. By starting the vacuum pump, a negative pressure state is created inside the smelting pot, and heat-conducting oil is heated for smelting. Under the negative pressure and vacuum conditions, as the smelting temperature of the raw materials reaches 85 degrees, the moisture begins to evaporate. The degree of vacuum is maintained at -0.03 to -0.06 Mpa, depending on the amount of steam evaporation. As the smelting temperature increases to 100 degrees, most of the moisture is evaporated. The animal fat raw materials can achieve rapid separation of oil, water, and residue. When the material temperature reaches around 120 degrees, the smelting process is essentially complete. The state of the oil and the dryness/wetness of the residue are observed through inspection holes. After the oil foams and the residue solidifies, the heating valve is closed, and the residue separation machine is started to begin the discharge and separation of the residue. Depending on the grade of the raw materials, the smelting time generally ranges from 1.5 to 3 hours.

【Vacuum Condensation Process】: This process utilizes a water-jet vacuum pump unit, which has a high steam extraction capacity and operates smoothly. The vacuum unit is equipped with a tube-type heat exchanger. Water vapor molecules evaporated from the raw materials, as well as volatile compounds such as oil fumes and odorous substances, are rapidly separated from the raw fat under vacuum conditions. They enter the tube-type heat exchanger along with the airflow in the vacuum pipeline. The heat exchanger utilizes counter-current circulation of cold water to cool down, causing the vapor and fumes to condense into liquid form. The condensed water is collected in a separation tank, while the waste gas is released freely.

【Oil Dregs Separation Process】: This process is used to separate the mixture of refined oil and dregs. First, a sieve plate type oil dregs separator is used for coarse separation, separating the oil dregs larger than 0.4mm from other substances. These large particles of oil dregs are then transported to the pressing section through scraper conveying equipment.

Microscopic oil dregs and crude oil mixture are pumped into a blade filter machine for fine filtration. The filter plates of the machine are made of 316L stainless steel, known for its excellent corrosion resistance. The filtration precision reaches or exceeds 99%, effectively removing tiny particles and impurities. After fine filtration, the clarity of the oil will improve, reaching a clear and transparent state.

Finally, the finished oil is transported to the storage tank. The objective of this process is to separate pure oil from the oil dregs mixture and ensure the quality of the finished oil meets the requirements.

【Meat Pressing Process】: The meat pressing process involves the use of a specialized spiral oil press machine designed for animal meat residue. This press machine possesses excellent performance and allows for the adjustment of pressure to suit the optimal conditions for pressing animal meat residue. The pressing cake is formed in a single operation, with residual oil content at around 10%. The pressed cake exhibits bright color, loose structure, and low powderiness.

The resulting oil obtained from this process is light in color, contains minimal impurities, and boasts a pure aroma, indicating its excellent quality.

【Tail Gas Recovery Process】: The tail gas recovery process involves the use of a packed scrubber tower, which utilizes the contact between gas and liquid to transfer trace pollutants from the adsorbed gas into the liquid. The clean gas is then separated from the contaminated liquid, achieving the goal of purifying the air. The exhaust gas passes through a stainless steel packed scrubber tower and is treated using a reverse absorption method with gas-liquid spray. The liquid is sprayed in a mist (or small droplets) from the top of the tower downward. The exhaust gas reaches the gas-liquid contact point at the bottom of the tower (counterflow). This treatment method cools the exhaust gas, adjusts the trace molecules in the gas, and after treatment through the packing section, it is discharged into the atmosphere.

The scrubber tower receives the collected exhaust gas from the ventilation system and allows it to come into full contact with the washing liquid flowing on the surface of the packing media in the medium of gas/liquid contact reaction. This ensures thorough adsorption of acidic or alkaline pollutants contained in the exhaust gas. The counterflow scrubber tower effectively and economically treats the exhaust gas, achieving a removal efficiency of over 99.5% for odor elimination.

The device utilizes thermal oil and steam as heat media, employing low-temperature vacuum drying technology, which greatly improves production efficiency. The equipment has a high level of automation, significantly reducing labor costs. It increases the one-time extraction rate of oil and grease, resulting in low acid value, good color, energy conservation, and environmental protection. The overall production process is fully enclosed, with centralized recovery and treatment of wastewater and exhaust gas. This addresses the shortcomings of traditional refining workshops in terms of hygiene and cleanliness and aligns with the current national environmental protection policies. The equipment supports diversified production, accommodating various animal fat raw materials for oil refining and raising the animal oil and fat production industry to new heights.

Advantages of the equipment include automatic feeding, simple operation, automatic slag discharge, and compliance with environmental standards. The oil and grease have low peroxide values, transparent color, rich aroma, and no impurities.