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

Inactive Publication Date: 2014-03-26
QINGDAO JIENENG ENERGY SAVING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods require high equipment and consume a lot of energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a method for refining biodiesel by-product crude glycerine. The method comprises the following steps: saponifying, namely weighing a certain amount of biodiesel by-product crude glycerine, and carrying out saponification according to the molar ratio of potassium hydroxide methanol solution to esters being 1-2; 2, acidizing, namely adding 30g of saponified crude glycerine to a 500mL of three-necked flask, adding a polar reagent methanol as an extracting agent according to the volume ratio of 4:1 to 1:4, adding a dilute acid solution to adjust the pH of the solution to be 1-5, agitating, standing and layering and collecting subnatant; 3, adsorbing, namely respectively adding 50-80mg / L of activated carbon to the subnatant, heating at 70 DEG C to remove methanol, finally pouring the solution into a separating funnel, cooling and layering: 4, determining the content of glycerine. The method has the beneficial effects that the biodiesel by-product crude glycerine is refined, so that not only is the value of crude glycerine improved, but also raw materials are supplied to the fields such as pharmacy, food and the like. The method disclosed by the invention is simple, mild in reaction condition, low in requirement on equipment, and strong in practicability.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for refining crude glycerol, a by-product of biodiesel. Background technique [0002] Pure glycerin (glycerol) is a colorless, sweet-smelling viscous liquid that is widely used in pharmaceutical, food, cosmetic, cellophane, insulating materials and chemical industries. A large amount of by-product crude glycerin is produced in the process of producing biodiesel from animal and vegetable oils. Crude glycerin can be purified by removing the salt content in glycerin through macroporous strong acid ion resin. and use membrane filtration to remove impurities. However, these methods require high equipment and consume a lot of energy. Contents of the invention [0003] According to above-mentioned deficiencies, the object of the present invention is to provide a kind of method for the crude glycerol refining of biodiesel by-product. [0004] The technical scheme of the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/22C07C29/74
CPCC07C29/74
Inventor 于政钦
Owner QINGDAO JIENENG ENERGY SAVING ENVIRONMENTAL PROTECTION TECH
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