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Recovery and purification method of glycerol as by-product of biodiesel production prepared by Jatrohpa curcas seed oil

A technology for biodiesel and tung seeds, which is applied in the preparation of liquid hydrocarbon mixtures, biofuels, biomaterials, etc., can solve problems such as failure to produce and stop production of synthetic glycerin units, and achieve good product quality, reduced production costs, and high output. Effect

Inactive Publication Date: 2012-07-11
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the implementation of my country's policy of reform and opening up, my country has successively introduced several sets of technologies and devices for chemically synthesizing glycerin. However, epichlorohydrin, the intermediate raw material for synthesizing glycerin, is not only in short supply in the domestic market, but also has a higher price than glycerin. As a result, the synthetic glycerin plant has been shut down for more than ten years, and has not been able to produce

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of crude glycerin:

[0035] Add 800g of jatropha seed oil into the reaction flask, stir and heat to 60°C, then add 260ml of methanol (or ethanol) solution dissolved in 10.5g of potassium hydroxide, and fully stir for 60min. After the reaction, transfer it to a separatory funnel, let it stand overnight, and divide it into upper and lower layers, the upper layer is a biodiesel layer, and the lower layer is a crude glycerin layer.

[0036] 2. Separation and purification of crude glycerin

[0037] Put the lower layer at 50°C, evaporate the methanol (or ethanol) in the crude glycerol under reduced pressure under the absolute pressure of 0.08MPa, stir and heat the remaining liquid to 60°C, add 40.0ml of 40% sulfuric acid solution, and stir for 30

[0038] min, after the reaction, transfer it to a separatory funnel, let it stand for 1.0h, and divide it into upper and lower layers, the upper layer is a fatty acid layer, and the lower layer is a glycerin layer, a...

Embodiment 2

[0042] 1. Preparation of crude glycerin:

[0043] With embodiment 1.

[0044] 2. Separation and purification of crude glycerin

[0045] Put the lower layer at 50°C, distill the methanol (or ethanol) in the crude glycerol under reduced pressure under the absolute pressure of 0.08MPa, stir and heat the remaining liquid to 60°C, add 40.0ml of 40% sulfuric acid solution, and stir for 60

[0046] min, after the reaction, transfer it to a separatory funnel, let it stand for 1.0h, and divide it into upper and lower layers, the upper layer is a fatty acid layer, and the lower layer is a glycerin layer, and the lower layer is separated. Add about 35.2 ml of 50% potassium hydroxide solution to the lower layer to neutralize the pH value to 6, stir at room temperature for 30 min, and filter. Add 100ml of 95% ethanol to the filtrate, stir evenly, put it at 10°C, let it stand overnight, and then filter to precipitate solids. The filtrate is evaporated to remove ethanol under reduced press...

Embodiment 3

[0050] 1. Preparation of crude glycerin:

[0051] With embodiment 1.

[0052] 2. Separation and purification of crude glycerin

[0053] Put the lower layer at 50°C, evaporate the methanol (or ethanol) in the crude glycerol under reduced pressure at an absolute pressure of 0.08MPa, stir and heat the remaining liquid to 40°C, add 40.0ml of 40% sulfuric acid solution, stir for 60min, and the reaction is complete Finally, transfer to a separatory funnel, let it stand for 1.0h, and divide into upper and lower layers, the upper layer is a fatty acid layer, and the lower layer is a glycerin layer, and the lower layer liquid is separated. Add about 35.2 ml of 50% potassium hydroxide solution to the lower layer to neutralize the pH value to 6, stir at room temperature for 30 min, and filter. Add 100ml of 90% ethanol to the filtrate, stir evenly, put it at 20°C, let it stand overnight, and then filter to precipitate solids. The filtrate is evaporated to remove ethanol under reduced pr...

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Abstract

The invention discloses a recovery and refining method for a diesel byproduct, glycerin produced by barbadosnut seed oil, wherein the glycerin can finally reach the medical-grade standard. The concrete method comprises the following steps: methanol is vaporized under pressure reduction in a waste liquid obtained after the barbadosnut seed oil uses potassium hydroxide as a catalyst to produce biodiesel through a methanol or alcohol ester exchange reaction, an aqueous solution of acid is added into a remaining liquid for reaction, a crude fatty acid is removed through liquid separation, then anaqueous solution of alkali is used to neutralize to be neutral, a filtrate is added with absolute ethyl alcohol after the filtration, kept stand for one night, and is refiltered, inorganic salt is further removed, and alcohol is removed through vaporization. Finally, the molecular distillation is performed to obtain medical-grade high-purity glycerin. The medical-grade glycerin is produced by utilizing the barbadosnut seed oil to produce the biodiesel byproduct, the obtained product has the advantages of excellent performance, suitability for industrialized production and so on, and the method greatly reduces the production cost for the biodiesel and has remarkable economical and social benefits.

Description

technical field [0001] The invention relates to a method for recovering and refining the by-product glycerin after biodiesel is produced from jatropha (Jatropha curcas) seed oil, so as to finally produce glycerin that reaches pharmaceutical grade standards. Background technique [0002] Developing biodiesel industry and increasing national fuel oil sources and reserves are important national energy policies of our country. As the most suitable variety for biodiesel production at present, the bottleneck in the promotion and use of biodiesel made from jatropha seed oil is that the production cost is relatively high, and it cannot compete with petrochemical diesel. Comprehensively utilize the whole Jatropha plant and processing by-products, with the goal of greatly improving the comprehensive economic benefits of the entire Jatropha industry, improving the economic benefits of industry, agriculture, and forestry in the region, and providing strong support for poverty alleviatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/74C10G3/00
CPCY02E50/13Y02P30/20Y02E50/10
Inventor 李宝才杨宏博角仕云张惠芬戴伟锋何静刘存存李敏刘建珍张水花毕艳艳李月梅秦谊黄昆
Owner KUNMING UNIV OF SCI & TECH
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