Oilseed and oil processing technology-Recovery of solvent in solvent-carrying air
1. Process flow
Air can enter the extractor along with the feed, and enter the entire extraction equipment system to mix with solvent vapor. This part of air cannot be condensed into liquid, so it is called "solvent-carrying air". The long-term accumulation of solvent-carrying air increases the pressure in the system and affects the smooth progress of production. Therefore, the solvent-carrying air must be discharged from the system in time. However, this part of the air contains a large amount of solvent vapor, and the solvent contained in it needs to be recovered before being discharged. The solvent-carrying air from the extractor, water separation tank, miscella tank, condenser, and solvent cyclic tank is all collected in the air balancing tank, and then enters the final condenser.
Some oil plants combine the air balancing tank and the final condenser into one. After the solvent contained in the solvent-carrying air is partially condensed and recovered, there is still uncondensed gas, which still contains a small amount of solvent, and should be recovered as much as possible before the exhaust gas is emptied.
2. Process equipment
At present, the commonly used methods mainly include: solvent recovery from vent gas with paraffin oil and freezing recovery at low temperature.
Air can enter the extractor along with the feed, and enter the entire extraction equipment system to mix with solvent vapor. This part of air cannot be condensed into liquid, so it is called "solvent-carrying air". The long-term accumulation of solvent-carrying air increases the pressure in the system and affects the smooth progress of production. Therefore, the solvent-carrying air must be discharged from the system in time. However, this part of the air contains a large amount of solvent vapor, and the solvent contained in it needs to be recovered before being discharged. The solvent-carrying air from the extractor, water separation tank, miscella tank, condenser, and solvent cyclic tank is all collected in the air balancing tank, and then enters the final condenser.
Some oil plants combine the air balancing tank and the final condenser into one. After the solvent contained in the solvent-carrying air is partially condensed and recovered, there is still uncondensed gas, which still contains a small amount of solvent, and should be recovered as much as possible before the exhaust gas is emptied.
2. Process equipment
At present, the commonly used methods mainly include: solvent recovery from vent gas with paraffin oil and freezing recovery at low temperature.
