Process flow: Crude oil is pumped into the oil refining pot for degumming and neutralization. When the oil and soap are clearly separated and sink quickly, stop stirring, let it stand, and then suck out the upper layer of clear oil until it is washed with water. The saponaria is put into the saponaria bucket from the bottom emptying pipe. When the saponaria contains a lot of oil, stop putting the soapstock, and the soapstock is pumped into the soapstock canister. The remaining oil in the refining tank is mixed into the next tank to continue. The clean oil transferred from the refining tank is washed with water and then sent to the decolorization tank for adsorption decolorization.
The decolorized oil is pumped into the gas separator at a constant flow rate through a pump, and the flow rate of the oil is adjusted by a flow meter. In the gas separator, oil is sprayed out through multiple nozzles on the feed pipe, and a high vacuum with an absolute pressure of about 3 mmHg is maintained in the gas separator to release a small amount of air infiltrated into the oil. The oil comes out of the gas separator, is pumped into the oil-oil exchanger, exchanges heat with the hot oil from the deodorization tower, and is heated to at least 180°C. From the oil-oil heat exchanger, the oil flows into the heat-conducting oil furnace heater and is heated to 260°C. The heat-conducting oil is heated to 290°C in the heat-conducting oil furnace and is recycled in the whole process. The hot oil to be deodorized enters the combined deodorization tower from the heat-conducting oil heater, where fatty acids and other relatively volatile odor substances are removed by direct steaming in the packing section, and then enters the plate section for deodorization and thermal decolorization. When processing oils with low acid value or low requirements for the acid value of the finished oil, it is not necessary to pass through the packing section, and directly deodorize and thermally decolorize the plate section. The deacidified and deodorized oil is discharged from the combined deodorization tower, pumped into the heat exchanger to exchange with the oil to be deodorized, and then enters the cooler, where it is cooled by water. After cooling, the oil temperature is not higher than 70°C, and then passes through the fine filter. Carry out insurance filtering, and then store in the product oil tank for storage.
For deodorized rice bran oil, tea seed oil, corn germ oil and other oils with high fat (wax) content, further dewaxing and degreasing should be carried out.
Main features: physical refining process is adopted, no alkali refining and deacidification is required, the loss of neutral oil is avoided, and the production cost is greatly reduced.
Suitable oil varieties: rice bran oil, tea seed oil, corn germ, animal oil and other oils with high acid value and many impurities.
The main complete sets of equipment: heat exchangers, gas separators, heaters, combined deodorizers, fatty acid traps, coolers, four-stage steam jet pumps, heat conduction oil furnace units.