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Method for refining biodiesel byproduct glycerin

A technology of biodiesel and by-products, applied in the field of oleochemical industry, can solve the problem of high cost of pure glycerin, and achieve the effects of uniform product quality, high efficiency and lower recovery costs

Inactive Publication Date: 2008-05-21
KUNMING UNIV OF SCI & 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 glycerol from this is very high

Method used

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  • Method for refining biodiesel byproduct glycerin

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The by-product glycerin that rapeseed oil prepares biodiesel produces is added in the acidification reactor, with 3mol L -1 H 2 SO 4 Adjust the pH to 5.2, acidify at 50±5°C for 30 minutes, and let stand to separate layers. The glycerol in the lower layer enters the neutralization reactor, with 3mol·L -1 Ba(OH) 2 Adjust the pH to 8.0, separate the precipitate, and the glycerol layer enters the ion exchange column to remove various impurities and then enters the short-distance pipeline evaporator for concentration and evaporation to obtain the product refined glycerin. The purity of the refined glycerin is 99.24%, the specific gravity (20°C) is 1.2630, no peculiar smell, and the chromaticity (Hazen) is 5.

Embodiment 2

[0019] Embodiment two: the by-product glycerin that Jatropha oil prepares biodiesel produces is added in the acidification reactor, with 3mol L -1 H 2 SO 4 Adjust the pH to 5.8, acidify at 60±5°C for 40 minutes, and let stand to separate layers. The glycerol in the lower layer enters the neutralization reactor, with 3mol·L -1 Ba(OH) 2 Adjust the pH to 8.0, separate the precipitate, and the glycerol layer enters the ion exchange column to remove various impurities and then enters the short-distance pipeline evaporator for concentration and evaporation to obtain the product refined glycerin. The purity of the refined glycerin is 99.65%, the specific gravity (20°C) is 1.2634, no peculiar smell, and the chromaticity (Hazen) is 5.

Embodiment 3

[0020] Embodiment 3: The by-product glycerin that waste oil prepares biodiesel produces is added in the acidification reactor, with 3mol L -1 H 2 SO 4 Adjust the pH to 5.5, acidify at 55±5°C for 35 minutes, and let stand to separate layers. The glycerol in the lower layer enters the neutralization reactor, with 3mol·L -1 Ba(OH) 2 Adjust the pH to 7.8, separate the precipitate, and the glycerin layer enters the ion exchange column to remove various impurities and then enters the short-distance pipeline evaporator for concentration and evaporation to obtain the product refined glycerin. The purity of the refined glycerin is 98.99%, the specific gravity (20°C) is 1.2627, no peculiar smell, and the chromaticity (Hazen) is 5.

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Abstract

The invention provides a method of refining a biological diesel oil by-product of glycerol. The invention relates to the technical field of the oil and fat chemical industry and more particularly a method of refining the biological diesel oil by-product of the glycerol. The steps of the method are that crude glycerol produced during the production process of the biological diesel oil is added into a acidification reactor for the acidification treatment; acidified oil at the upper layer is returned to a biological diesel oil production system as the production materials of the biological diesel oil, and the glycerol at the lower layer is put into a neutralization reactor for the neutralization reaction; the glycerol layer is put into an ion exchange column for impurity removal to obtain the dilute solution of glycerol which contains water; the dilute solution of glycerol is put into a short-stroke pipeline evaporator for continuous evaporation and concentration to obtain the refined glycerol product. The technical process of the invention is simple; the efficiency is high; the investment is less; the quality of the obtained product is uniform; the invention can reduce the recycle cost of the glycerol and the production cost of the biological diesel oil.

Description

technical field [0001] The invention relates to the technical field of oleochemicals, in particular to a method for refining 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, better low-temperature engine start-up performance and safety performance, and is renewable. It has been highly valued by countries all over the world. Become the most popular alternative to petrochemical diesel. High-purity glycerin is a very important industrial raw material and is widely used in industries such as food, medicine, cosmetics and tobacco. Generally, the purification process of crude glycerin needs to go through processes such as filtration, concentration, chemical additives, distillation, etc. If it is to be used in food, cosmetics, pharmaceuticals and other fields, it needs further processing. Clearly, the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/22C07C29/74
Inventor 苏有勇王华包桂蓉吴桢芬王督
Owner KUNMING UNIV OF SCI & TECH
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