Solvent extraction technology of edible oil is an efficient method for oil extraction, which is widely used in the processing and production of oil crops such as soybean, rapeseed and peanut. However, in practice, this process also faces some technical difficulties, which need to be constantly overcome and optimized by professional technical teams.

Solvent selection is one of the core problems of technology. Commonly used solvents, such as No.6 solvent oil, have good solubility, but their volatility and flammability put forward strict requirements for production equipment and operating environment. Once the solvent volatilization is not properly controlled, it may not only lead to economic losses, but also cause potential safety hazards. Therefore, how to improve extraction efficiency and reduce solvent loss has become an important direction of technology research and development.

The problem of solvent residue is also a key difficulty. The trace solvent residue may exist in the extracted oil and refined oil, which is directly related to food safety and product quality. In order to meet the national food safety standards, efficient desolventizing processes, such as steam desolventizing and vacuum desolventizing, need to be adopted in the production process, which puts high demands on equipment design and process parameter control.

Energy consumption is another technical problem that needs attention. Solvent extraction process involves many steps of heating, cooling and distillation, and these processes require high energy. If the energy utilization efficiency is low, it will not only increase the production cost, but also cause environmental burden. Therefore, how to optimize the heat energy recovery system and reduce the unit energy consumption is an important topic for enterprises to pursue sustainable development.

The sealing and corrosion resistance of equipment are also key technical points. Because the solvent is corrosive, the choice of equipment materials and sealing performance directly affect the service life and operation stability of production equipment. Advanced sealing technology and material application have played an important role in reducing leakage and improving equipment reliability.

To sum up, the solvent extraction process of edible oil has obvious advantages in improving production efficiency and raw material utilization, but it also faces many technical challenges. Through continuous innovation and optimization of process flow, with the help of modern technical means, these problems are expected to be gradually solved, thus promoting the development of edible oil industry in a more efficient, safer and more environmentally friendly direction.