Method for purifying glycerin from biodiesel production by-products
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A biodiesel and by-product technology, applied in the biological field, can solve the problems of poor removal effect, heavy resin or membrane burden and pollution, and achieve low cost, good impurity removal and depigmentation effect, and high removal efficiency
Active Publication Date: 2019-05-07
CHINA PETROLEUM & CHEM CORP +1
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[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
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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
The invention relates to a method for purifying glycerin from biodiesel production by-products. The method comprises: diluting with methanol, removing part of inorganic salts, neutralizing by adding an alkali, adding an organic solvent insoluble or slightly soluble with glycerin and miscible with organic acids and other organic impurities, extracting, removing organic acids, partial pigments and other organic impurities, distilling to remove the methanol, diluting by adding water, purifying sequentially with an acidic cation exchange resin and an alkaline anion exchange resin, carrying out evaporation dehydration, and removing light components to obtain the high-purity glycerin product. According to the present invention, with the method, the pretreatment is performed with the inorganic acid before the ion exchange, such that the salt can be effectively removed while the excess alkali in the material liquid can be neutralized and part of the organic matters can be removed; the organicsolvent extracts the organic acid, part of the pigments and other organic impurities in the crude glycerin; with the treatment, the burden of the desalting in the subsequent ion exchange process is effectively reduced, and the pollution on the resin is reduced; and the purity of the purified glycerin is above 99.5%, the glycerin loss is low, and the purification yield can reach more than 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...
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