Method 1: Using corn oil as raw material
Preparation of Acido Linoleico Crude Product Measure clarified corn oil, gradually add 200g/L sodium hydroxide solution, stir while adding, continue to stir for 15min after adding, stand at 25-40°C for saponification for 48h, take out the saponified product, and use Pound it into pieces with a wooden shovel, slowly add 45%-50% sulfuric acid, and acidify at 30-40°C for 7 hours to obtain the crude product of Acido Linoleico.
Corn Germ Oil [NaOH,25-40℃]→Saponified [H2SO4,30-40℃]→Acido Linoleico crude product
Preparation of finished linoleic acid product Take the crude product in a separatory funnel, add 2 times the volume of tap water at 30°C, shake, separate the water layer, repeat this 5-6 times, then wash with warm distilled water until there is no sulfate , to obtain linoleic acid solution. Add 100g/L anhydrous sodium sulfate, shake well, and let stand at 25-30°C for 48-96h to obtain the refined product. Suction filter the refined product, and the filtrate is the finished product of linoleic acid.
Acido Linoleico crude product [H2O, 30℃] → Acido Linoleico liquid [anhydrous Na2SO4, 25℃] → linoleic acid refined product [suction filtration] → Acido Linoleico finished product
Method 2: Using soybean oil foot as raw material
Preparation of soap slurry Take soybean oil scraps, heat to about 90°C, add a little sodium hydroxide solution of 1/10-1/7 times the amount, continue heating for 15 minutes, then add the remaining lye, until the phenolphthalein indicator turns purple , and then heated and boiled for 2-3h to obtain saponified matter. Add 1/20-1/10 times the amount of industrial sodium chloride to the saponified product twice, heat until the soap slurry does not stick to the knife when sampling with the spatula, and stop when there is obvious black water precipitation, and then heat for 1-2h, Insulate and stand for 3 hours, pump out the lower layer of black water to obtain soap slurry.
Refined oil offal [NaOH,>90℃]→saponified liquid[NaCl]→soap slurry
Preparation of black fatty acid Add the waste acid water extracted from the first batch of acidification to the soap slurry, heat it with steam for 30 minutes, let it stand for 1 hour, draw out the waste water, and then slowly add 1/10-1/7 times the amount of concentrated sulfuric acid to When stratification occurs, let stand for 1 hour, take out the waste acid water in the lower layer, and reserve it for the next batch of acidification to obtain the acidification solution. Add 3 times the amount of clear water to the acidification solution, heat it with steam to above 80°C for 20 minutes, let it stand for 30 minutes, pump out the waste water, and repeat the operation 3-4 times until the pH value of the waste water is 6-7 to obtain black fatty acid.
Soap slurry [H2SO4]→acidified solution[H2O,>80℃]→black fatty acid
Preparation of Acido Linoleico Crude Product Heat black fatty acid to about 105°C, suck it into the distillation tower in batches, and distill under reduced pressure. 190-200°C. For 1.5 hours each time, steam the mixed fatty acids and put the black feet once. Freeze the mixed fatty acid to about 0-2°C, take it out and put it in a wet cloth bag and press it with a hydraulic press, gradually increase the pressure to 14.71MPa, press for 10-12 hours, the extruded liquid is crude linoleic acid, and the solid matter left in the bag For stearic acid.
Preparation of Acido Linoleico Finished Product Heat the crude linoleic acid to 100°C, suck it into the distillation tower, feed 90kg each time, the temperature of the biphenyl furnace is 265-275°C, the pressure is 19.6-49kPa, the vacuum of the distillation tower is above 99.75kPa, and the gas phase temperature is 185 -200°C, the distillate is Acido Linoleico.
Crude linoleic acid [185-200°C, 100kpa]→Acido Linoleico finished product.