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A method for purifying glycerin from by-products of biodiesel production

A biodiesel and by-product technology, applied in the biological field, can solve the problems of heavy resin or membrane burden, pollution, poor removal effect, etc., and achieve the effect of good decontamination and depigmentation effect, low cost and high removal efficiency.

Active Publication Date: 2021-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the poor removal effect of the existing biodiesel by-product crude glycerin purification technology in terms of desalination and removal of organic impurities, and the subsequent use of resin or membrane to separate it, it will cause excessive burden and pollution to the resin or membrane problem, the present invention intends to provide a crude glycerol purification method with high treatment efficiency for salt and organic impurities, relatively simple process and low cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Using palm oil as raw material, sodium hydroxide base is used to catalyze methanol and palm oil through transesterification reaction, standing still, and after layering, biodiesel and its by-product crude glycerin are obtained. Among them, the content of glycerol in biodiesel by-products is 49.6%, the content of fatty acid soap is 19.4%, and the content of fatty acid methyl ester is 9.7%. Carry out the purification of glycerol to it:

[0033] (1) Take 1000g of biodiesel by-products, add 600mL of methanol to it for dilution, then gradually add 40% phosphoric acid solution, adjust the pH value of the feed solution to 4, stir evenly, centrifuge and separate the feed liquid, take the middle layer, Obtained the crude glycerin feed liquid that removes fatty acid ester, most fatty acids and some salts, and the desalination rate of this process is 45.1%;

[0034] (2) Add 0.1mol / L sodium borohydride solution to the crude glycerin feed liquid obtained in (1) to neutralize excess...

Embodiment 2

[0039] Taking sorbifolia oil as raw material, using sodium hydroxide base to catalyze the transesterification reaction between methanol and sorbifolia oil, standing still, and after layering, biodiesel and its by-product crude glycerin are prepared. Among them, the content of glycerol in biodiesel by-products is 51.2%, the content of fatty acid soap is 18.9%, and the content of fatty acid methyl ester is 11.3%. Carry out the purification of glycerol to it:

[0040] (1) Take 1000g of biodiesel by-products, add 1000mL of methanol to it for dilution, then gradually add 40% phosphoric acid solution, adjust the pH value of the feed solution to 4, stir evenly, centrifuge and separate the feed liquid, take the middle layer, Obtain the crude glycerol feed liquid that removes fatty acid ester, most fatty acids and some salts;

[0041] (2) Add 0.1 mol / L sodium hydroxide solution to the crude glycerin feed liquid obtained in (1) to neutralize excess inorganic acid, and adjust the pH of ...

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Abstract

A method for purifying glycerin from the by-products of biodiesel production. First, dilute with methanol, remove part of the inorganic salts, add alkali to neutralize, and then add glycerin insoluble or slightly soluble but miscible with organic acids and other organic impurities. Organic solvents, extraction, removal of organic acids, some pigments and other organic impurities; followed by distillation to remove methanol; diluted with water, followed by purification by acidic cation exchange resin and basic anion exchange resin, and then evaporated, dehydrated, and dehydrated Light components, to obtain high-purity glycerin products. The method of the present invention adopts inorganic acid pretreatment before ion exchange, while neutralizing excess alkali in the feed liquid and removing part of the organic matter, it can also effectively remove the salt therein; the organic solvent extracts the organic acid in the crude glycerin , some pigments and other organic impurities; the above treatments can effectively reduce the burden of desalination in the subsequent ion exchange process and reduce the pollution to the resin. The purity of the glycerin purified by the invention is above 99.5%, the loss of glycerin is small, and the purification yield can reach above 95%.

Description

technical field [0001] The invention belongs to the field of biotechnology, and relates to a method for refining biodiesel by-products, in particular to a method for purifying crude glycerin in biodiesel by-products. Background technique [0002] In today's world, with the increasing demand for alternative clean and renewable fuels, the technology of using biomass to produce biodiesel has been widely promoted. Biodiesel is a new energy source whose performance is very close to that of fossil fuel diesel, and it is also the most promising alternative energy source. For example, the Brazilian government has mandated that fuel sellers add 2% biodiesel to diesel fuel since January 2008. By May 2014, the proportion of biodiesel added will be increased to 6%, and the proportion will continue to increase. This has greatly stimulated the production of biodiesel. According to the report of "Oil World" in Hamburg, Germany, the production of biodiesel reached 32.8 million tons in 2016...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/74C07C31/22
Inventor 孙启梅王崇辉王领民高大成张霖樊亚超
Owner CHINA PETROLEUM & CHEM CORP
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