Cottonseed Oil Refining

Cottonseed oil is darker red than other oils, and it can be eaten by human beings after refining. It contains a lot of essential fatty acids, and it is best mixed with animal fat for consumption. Therefore, the difference between cottonseed and peanut, rapeseed and other edible oils is that peanut and rapeseed can be processed into strong-flavor peanut-rapeseed oil through strong-flavor processing equipment, while cottonseed oil must be refined by refining oil equipment before consumption. The purpose of refining is to remove the impurities in the oil, the most important thing is to remove the gossypol in the cottonseed oil, otherwise the human body will experience symptoms of palpitation, shortness of breath, fatigue, and dizziness after eating this oil containing free gossypol. There is also damage to the skin, so that the skin no longer sweats, and it is accompanied by a burning sensation of the skin, which is very uncomfortable. Regular consumption of crude cottonseed oil can cause damage to spermatogenic cells, leading to infertility.

To remove gossypol in oil, it is necessary to use cottonseed oil refining equipment for alkali refining. The purpose of alkali refining is to remove gossypol, free fatty acids, phospholipids and some pigments and impurities in cottonseed crude oil. We first prepare and measure the lye, and then add it to the oil. The time is controlled within five to ten minutes. When adding the lye, it is also stirred, and the stirring frequency is 60 revolutions per minute.

After adding the lye, do not stop, continue to stir for three minutes. After the oil and soap are separated, then raise the temperature to about 75 degrees and stop. Note here that during the time of raising the temperature, the stirring frequency drops to 30 revolutions per minute. After the temperature is reached, the soapstock and oil begin to separate, and the soapstock sinks rapidly, thus achieving the purpose of removing gossypol.