Method for refining biodiesel by-product crude glycerine
A technology for biodiesel and crude glycerin, applied in the chemical industry, can solve the problems of high energy consumption and high equipment requirements, and achieve the effects of low equipment requirements, increased value and simple methods
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Embodiment 2
[0014] A method for refining crude glycerol by-product of biodiesel, which comprises: 1. Saponification: take a certain mass of crude glycerin by-product of biodiesel, and carry out saponification reaction according to the molar ratio of methanol solution of potassium hydroxide to esters of 2; 2. Acidification: Add 30g of saponified crude glycerin into a 500mL three-neck flask, add polar reagent methanol as an extractant at a volume ratio of 4:1, and then add dilute sulfuric acid solution to make the pH of the solution 5, stir, and stand for stratification Remove the lower layer liquid; 3. Adsorption: add 80mg / L activated carbon to the lower layer liquid respectively, heat to remove methanol at 70°C; finally pour the solution into a separatory funnel, cool and separate layers; 4. Measure the glycerin content to be 79.17% .
Embodiment 3
[0016] A method for refining biodiesel by-product crude glycerin, which includes 1. saponification: take a certain quality of biodiesel by-product crude glycerin, and carry out saponification reaction according to the molar ratio of potassium hydroxide methanol solution to esters of 1.5; 2. acidification : In a 500mL three-necked flask, add 30g of saponified crude glycerol, add polar reagent methanol as the extraction agent at a volume ratio of 2:1, then add dilute sulfuric acid solution, so that the pH of the solution is 24, stir, and leave to separate layers to take Lower layer liquid; 3. Adsorption: Add 60mg / L activated carbon to the lower layer liquid, heat at 70°C to remove methanol; finally pour the solution into a separatory funnel, cool and separate layers; 4. Determine the glycerin content to be 86.34%.
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