Method for refining crude glycerine being by-product of biodiesel

A technology of biodiesel and crude glycerin, which is applied in the chemical industry, can solve the problems of high cost of pure glycerin, and achieve the effects of reducing the cost of glycerin recovery and refining, high efficiency and simple process

Inactive Publication Date: 2014-05-07
QINGDAO JIENENG ENERGY SAVING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously the cost of producing pure glycerin from this is very expensive

Method used

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  • Method for refining crude glycerine being by-product of biodiesel

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Embodiment 1

[0019] A method for refining crude glycerin, a by-product of biodiesel, comprising the following steps: adding crude glycerol produced in the biodiesel production process into an acidification reactor, adjusting the pH to 5 with dilute sulfuric acid, and acidifying at 45°C for 30 minutes; the upper layer The acidified oil is returned to the biodiesel production system as a raw material for biodiesel production. The glycerol solution in the lower layer enters the neutralization reactor, and the pH is adjusted to 7.5 with barium hydroxide solution, and the stratification is allowed to stand; the resulting precipitate is discharged from the bottom of the reactor, and the obtained dilute glycerin Solution cation exchange column, anion exchange column and mixed anion and cation exchange column remove various impurities to obtain a dilute glycerin solution; the dilute glycerol solution enters a short-distance pipeline evaporator for thin-layer efficient rapid continuous evaporation an...

Embodiment 2

[0021] A method for refining crude glycerin, a by-product of biodiesel, comprising the following steps: adding crude glycerol produced in the biodiesel production process into an acidification reactor, adjusting the pH to 6 with dilute sulfuric acid, and acidifying at 50°C for 60 minutes; the upper layer The acidified oil is returned to the biodiesel production system as a raw material for biodiesel production. The glycerol solution in the lower layer enters the neutralization reactor, and the pH is adjusted to 8.5 with barium hydroxide solution, and the stratification is allowed to stand; the resulting precipitate is discharged from the bottom of the reactor, and the obtained dilute glycerin Solution cation exchange column, anion exchange column and mixed anion and cation exchange column remove various impurities to obtain a dilute glycerin solution; the dilute glycerol solution enters a short-distance pipeline evaporator for thin-layer efficient rapid continuous evaporation an...

Embodiment 3

[0023] A method for refining crude glycerin, a by-product of biodiesel, comprising the following steps: adding crude glycerol produced in the biodiesel production process into an acidification reactor, adjusting the pH to 5.5 with dilute sulfuric acid, and acidifying at 53°C for 45 minutes; the upper layer The acidified oil is returned to the biodiesel production system as a raw material for biodiesel production. The glycerol solution in the lower layer enters the neutralization reactor, and the pH is adjusted to 8.0 with barium hydroxide solution, and the stratification is allowed to stand; the resulting precipitate is discharged from the bottom of the reactor, and the obtained dilute glycerin Solution cation exchange column, anion exchange column and mixed anion and cation exchange column remove various impurities to obtain a dilute glycerin solution; the dilute glycerol solution enters a short-distance pipeline evaporator for thin-layer efficient rapid continuous evaporation ...

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Abstract

The invention relates to a method for refining crude glycerine being a by-product of biodiesel, which comprises the following steps: the crude glycerine produced during the production process of biodiesel is added into an acidification reactor, dilute acid is utilized to adjust the pH to be faintly acid, and acidizing is performed for 30-60 minutes at the temperature of 45-50 DEG C; upper-layer acid oil returns to a biodiesel preparation system and is used as the biodiesel production raw material, the lower-layer glycerine solution enters into a neutralized reactor, a dilute aqueous alkali is used for adjusting the pH to alkalescence, and standing is performed for layering; the produced sediment is discharged from the bottom of the reactor, and various impurities in the obtained dilute glycerite are removed via an ion exchange column to obtain a glycerinum dilute solution; the glycerinum dilute solution enters into a short-range pipeline evaporator, and thin layer efficient rapid continuous evaporation and concentration are performed to obtain high-purity glycerine. The method has the following benefits: through the combination of ion exchange and the pipeline thin layer evaporation technology, the flow is simple, the efficiency is high, and the costs for recycling and refining glycerine and preparing biodiesel are reduced.

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] Biodiesel is a kind of biomass energy that has developed rapidly in recent years. Compared with petrochemical diesel, it has excellent environmental protection, good low-temperature start-up and good renewability, etc., and has been highly valued by countries all over the world. Popular alternative to petrochemical diesel. A large amount of crude glycerol is produced as a by-product during the production of biodiesel, and approximately 100 kg of glycerol can be produced for every 1 ton of biodiesel produced. [0003] High-purity glycerin is a very important industrial raw material and is widely used in industries such as food, medicine, cosmetics and tobacco. However, the crude glycerol obtained from the production of biodiesel contains impurities. Whether it can be further purified d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/22C07C29/88C07C29/76C07C29/78
CPCC07C29/76C07C29/78C07C29/88
Inventor 田英勇
Owner QINGDAO JIENENG ENERGY SAVING ENVIRONMENTAL PROTECTION TECH
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