Oilseed and oil processing technology-Selection basis and basic process flow of extraction process
Whether the extraction production can proceed smoothly is closely related to the selected process, which directly affects the product quality, production cost, production capacity and operating conditions of the oil plant after it is put into production. Therefore, an advanced and reasonable technological process should be adopted. The basis for selecting the process flow is:
①Select according to the variety and nature of raw materials
According to the different types of raw materials, different technological processes are adopted.
Such as processing cottonseed. The technological process is:
Cottonseed → cleaning → delinting → hulling → kernel husk separation → softening → flaking → cooking → pre-pressing → extraction.
For rapeseed, the technological process is:
Rapeseed → cleaning → flaking → cooking → pre-pressing → extraction.
According to the different oil content of raw materials, determine whether to use single extraction or pre-pressing extraction. As mentioned above, rapeseed and cottonseed kernels are all high-oil raw materials, so the pre-pressing extraction process should be used. However, the oil content of soybeans is low, so a single extraction process should be used.
Soybean → cleaning → crushing → softening →flaking→ drying → extraction.
②Select according to the requirements for products and by-products
The requirements for products and by-products are different, and the process conditions should be changed accordingly. For example, soybeans are also processed, and soybean meal is used to extract protein powder. Soybeans must be peeled to reduce the content of crude fiber and relatively increase the content of protein. It is:
Soybean → cleaning → drying → temperature adjustment → crushing → peeling → softening → flaking → extraction → extraction meal → baking → cooling → crushing → high protein soybean meal.
③Select according to production capacity
Oil plants with large production capacity can choose more complicated processes and more advanced equipment; oil plants with small production capacity can choose relatively simple processes and equipment. For example, a extraction workshop with a daily processing capacity of more than 50 tons may consider using paraffin oil exhaust gas absorption devices and refrigerated exhaust gas recovery solvent devices.
①Select according to the variety and nature of raw materials
According to the different types of raw materials, different technological processes are adopted.
Such as processing cottonseed. The technological process is:
Cottonseed → cleaning → delinting → hulling → kernel husk separation → softening → flaking → cooking → pre-pressing → extraction.
For rapeseed, the technological process is:
Rapeseed → cleaning → flaking → cooking → pre-pressing → extraction.
According to the different oil content of raw materials, determine whether to use single extraction or pre-pressing extraction. As mentioned above, rapeseed and cottonseed kernels are all high-oil raw materials, so the pre-pressing extraction process should be used. However, the oil content of soybeans is low, so a single extraction process should be used.
Soybean → cleaning → crushing → softening →flaking→ drying → extraction.
②Select according to the requirements for products and by-products
The requirements for products and by-products are different, and the process conditions should be changed accordingly. For example, soybeans are also processed, and soybean meal is used to extract protein powder. Soybeans must be peeled to reduce the content of crude fiber and relatively increase the content of protein. It is:
Soybean → cleaning → drying → temperature adjustment → crushing → peeling → softening → flaking → extraction → extraction meal → baking → cooling → crushing → high protein soybean meal.
③Select according to production capacity
Oil plants with large production capacity can choose more complicated processes and more advanced equipment; oil plants with small production capacity can choose relatively simple processes and equipment. For example, a extraction workshop with a daily processing capacity of more than 50 tons may consider using paraffin oil exhaust gas absorption devices and refrigerated exhaust gas recovery solvent devices.
