Oils and oils-determination of soap content

How much is a reasonable amount of soap? -------------------------------------- I think it was 96%. -------------------------------------- I also want to know, looking forward to the expert's advice? -------------------------------------- This post was last edited by tj4587_78 on 2009 - 10 - 15 16:13 The soap content of oil has not been heard, oil should not contain soap! Do you want to know the percentage of fat? If so, it should be above 96%. Unsaponifiable matter should be less than 1%. -------------------------------------- The saponification rate, the higher the better! GB 5533 - 85 Test of vegetable oils and fats-------------------------------------------------------------------------------------2003 - 9 - 13 People's Republic of China National Standard Inspection of vegetable oils and fats-Determination of soap content GB5533 - 85 Inspection of vegetable oils Methods for determination of saponified matter content This standard is applicable to the determination of soap content in commercial vegetable oils and fats. The soap content in the oil, that is, the amount of saponified matter remaining in the oil after alkali refining (calculated by sodium oleate). 1 instruments and appliances 1.1 conical flask: 250 ml; 1.2 graduated cylinder; 1.3 microburet; 1.4 thermostatic water bath; 1.5 electric furnace; 1.6 beaker, reagent bottle, etc.; 1.7 analytical balance: sensitive 0.0001g; 1.8 balance: sensitive 0.01g. 2 Reagent 2.1 Petroleum ether: boiling point 60~90 ℃; 2.2 95% neutral ethanol; 2.3 0.2% methyl red ethanol solution; 2.4 0.02N sulfuric acid solution; 2.5 anhydrous sodium carbonate. 3 Operation method Weigh and mix about 10 g (W) of sample, pour into a dry conical flask, add 10 ml of ethanol and 60 ml of petroleum ether, shake to dissolve the sample, slowly add 80 ml of distilled water at 80 ℃, shake to make emulsion, drop 3 drops of methyl red indicator, add 0.02 N sulfuric acid solution drop by drop while hot, shake once for each drop, drop until the solution under stratification shows reddish color. 4 Results Calculate the soap content of oil according to the following formula: V × N × 0.304 Soap content (%)= ─ ─ ─ ─ × 100 W Formula: V--Volume of sulfuric acid solution used for titration, ml; N--Equivalent concentration of sulfuric acid solution; W--Weight of sample, g; 0.304--grams of sodium oleate per milliequivalent sulfuric acid. The allowable difference of double test results shall not exceed 0.02%, and the average shall be the measurement result. Take the second place after decimal point for determination results. - -------------------------------- This standard is drafted by Grain Storage and Transportation Bureau of Ministry of Commerce. Main drafters of this standard Gao Xiuwu, Yang Haoran, Wu Yanxia and Lv Guifen. ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- National Bureau of Standards 1985 - 11 - 02 Published 1986 - 07 - 01 Implemented-------------------------------------- No account? Register-------------------------------------- I would like to do a safety survey of feed-grade blended oils (I am a research student). this is only the preliminary stage of information search. Do you know the processing flow of mixed oil? Thank you, master ha-------------------------------------- QQ 859968416-------------------------------------- I think it's... Now all do TBA--------------------------------------