Salad oil production process
Acid: by steam or hot water, and make fat hydration, and then to remove impurities, the steam import oil, free fatty acids with steam distilled out, remove after condensation;Or get hot water mixed with oil emulsification and clarified in a centrifuge to remove phospholipids, free fatty acid and plant materials such as mucus.And vacuum drying, the product is called crude oil.
Alkali refining: by alkali refining, can further remove most of the free fatty acids, phospholipids, pigment, iron and copper ions and some sulfur-containing compounds.And 0.02% ~ 0.5% of phosphoric acid in cylindrical POTS, 60 ~ 90 ℃ under processing 15-30 minutes, another amount to 1% ~ 3% of 3% ~ 8% concentration of sodium hydroxide (caustic soda) is 10 ~ 30 minutes of saponification, due to the saponification material than major sank into the bottom of the pot after release called soapstock;Then under 65 ℃ water or dilute acid washing twice, put into water, then under the 114 ℃ heating to remove moisture, dry storage into the oil tank.
Hydrogenated: using the method of selective hydrogenation (temperature 200 ℃, pressure 41370 mpa) or non selective hydrogenation method (temperature 135 ℃, pressure 413690 mpa) processing, add 0.01% ~ 0.2% in coil hydrogenated pot of formic acid nickel or nickel carbonate, so as to promote unsaturated fatty acids in oils and fats hydrogenation and become saturated fatty acid, the cis into trans fatty acid isomers, to increase the degree of hardening of grease and oxidation resistance, and to improve oil fragrance.If using a hydrogenation device called kaufman, can under the temperature below 100 ℃, add 40% of the Miscella (an) oil solvent mixture, oil continuously through the catalyst (ni), also can complete hydrogenation process.In the oil there are only a small amount of oleic acid, the oil quality improved.
Esterification: the process is in 95 ~ 135 ℃ heating temperature about 2 hours, can also be used in catalyst (0.1% ~ 0.5% sodium methanol or
Alkali refining: by alkali refining, can further remove most of the free fatty acids, phospholipids, pigment, iron and copper ions and some sulfur-containing compounds.And 0.02% ~ 0.5% of phosphoric acid in cylindrical POTS, 60 ~ 90 ℃ under processing 15-30 minutes, another amount to 1% ~ 3% of 3% ~ 8% concentration of sodium hydroxide (caustic soda) is 10 ~ 30 minutes of saponification, due to the saponification material than major sank into the bottom of the pot after release called soapstock;Then under 65 ℃ water or dilute acid washing twice, put into water, then under the 114 ℃ heating to remove moisture, dry storage into the oil tank.
Hydrogenated: using the method of selective hydrogenation (temperature 200 ℃, pressure 41370 mpa) or non selective hydrogenation method (temperature 135 ℃, pressure 413690 mpa) processing, add 0.01% ~ 0.2% in coil hydrogenated pot of formic acid nickel or nickel carbonate, so as to promote unsaturated fatty acids in oils and fats hydrogenation and become saturated fatty acid, the cis into trans fatty acid isomers, to increase the degree of hardening of grease and oxidation resistance, and to improve oil fragrance.If using a hydrogenation device called kaufman, can under the temperature below 100 ℃, add 40% of the Miscella (an) oil solvent mixture, oil continuously through the catalyst (ni), also can complete hydrogenation process.In the oil there are only a small amount of oleic acid, the oil quality improved.
Esterification: the process is in 95 ~ 135 ℃ heating temperature about 2 hours, can also be used in catalyst (0.1% ~ 0.5% sodium methanol or