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Method for preparing low condensation point biodiesel from high acid value oil

A technology of biodiesel and high acid value oil, which is applied in the fields of biofuel, petroleum industry, fatty acid esterification, etc., can solve the problems that have not been seen in relevant reports, and achieve the improvement of low temperature fluidity, stability, and low temperature fluidity Improved effect

Inactive Publication Date: 2010-11-10
YUNNAN MINGHUI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] How to use high acid value oil to prepare biodiesel with low freezing point has not been reported so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] ①Pretreatment of waste oil: Take 200g of waste oil with an acid value of 121.5mgKOH / g and a water content of 3% and 100ml of an 8% aluminum sulfate solution, add them to an 800ml beaker, heat to 65-70°C, and stir After 20 minutes, pour it into a separatory funnel and let it stand for layering to separate the lower layer containing colloid and impurities. Put the upper layer of oil in a 1000ml round bottom flask and dehydrate it at 110-115°C to a water content of 0.4% to obtain 191.4g of oil.

[0029] ②Esterification reaction of oil: add pretreated oil, 150ml methanol, 50ml ethanol and 1.2g phosphomolybdenum tungstic acid into a 1000ml three-neck flask, heat at 65-72°C, stir for 60min, and evaporate unreacted alcohol under reduced pressure. Put the oil in a separatory funnel and let it stand for stratification, drain the catalyst water phase in the lower layer, pour it into a crucible and put it in an oven to dry the water to obtain 0.98 g of solid acid. The oil layer wa...

Embodiment 2

[0032] ① Pretreatment of palm waste oil: Take 100g of palm waste oil with an acid value of 119.8mgKOH / g and a moisture content of 3% and 60ml of aluminum sulfate solution with a concentration of 6%, add it to a 500ml beaker, and heat it to 65-70°C , stirred for 20 minutes, poured into a separatory funnel and allowed to stand for layering to separate the lower layer containing colloids and impurities. The upper layer of oil was placed in a 500ml round bottom flask and dehydrated to a water content of 0.4% at 110-115°C to obtain 92.6g of oil.

[0033] ②Esterification reaction of oil: add the pretreated oil, 60ml of methanol, 20ml of ethanol and 1.0g of phosphomolybdenum tungstic acid into a 500ml three-neck flask, heat at 65-70°C, stir for 40min, and evaporate the unreacted alcohol under reduced pressure. The oil was placed in a separatory funnel and allowed to stand for stratification, and the catalyst water phase in the lower layer was discharged, poured into a crucible and dri...

Embodiment 3

[0036]①Pretreatment of waste oil: Take 100g of waste oil with an acid value of 181.4mgKOH / g and a water content of 2% and 70ml of aluminum sulfate solution with a concentration of 5%, add them to a 500ml beaker, heat to 65-70°C, and stir After 20 minutes, pour it into a separatory funnel and let it stand for layering to separate the colloid and impurities in the lower layer. Put the oil in the upper layer in a 500ml round-bottomed flask and dehydrate at 110-115°C to a water content of 0.4% to obtain 92.8g of oil.

[0037] ②Esterification reaction of oil: add the pretreated oil, 70ml of methanol, 20ml of ethanol and 1.0g of phosphotungstic acid into a 500ml three-necked flask, heat at 65-70°C, stir for 30min, and steam the unreacted alcohol under reduced pressure. The oil was placed in a separatory funnel and allowed to stand for stratification, and the catalyst water phase in the lower layer was discharged, poured into a crucible and dried in an oven to obtain 0.89 g of solid a...

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Abstract

The invention discloses a method for preparing low condensation point biodiesel from high acid value oil. Animal and vegetable oils with the acid value higher than 80mgKOH / g serving as a raw material and mixed alcohol of methanol, ethanol and isopropanol undergo esterification and interesterification two-step reaction to prepare the low condensation point biodiesel. The intersolubiltiy of the oil and the methanol is improved by the ethanol so as to promote the methyl esterification reaction; meanwhile, the product contains a small amount of fatty acid ethyl esters, and new solid catalysts of tungsten molybdophosphate and phosphotungstic acidesterification replace concentrated sulfuric acid in the esterification reaction; and in the interesterification reaction, the ethanol and the isopropanol promote the conversion of glyceride, and simultaneously the product contains partial fatty acid ethyl esters and branched-chain aliphatic esters. Therefore, the reaction is easy to carry out, the cold flow properties of the biodiesel can be improved and the condensation point of the biodiesel can be reduced.

Description

technical field [0001] The invention belongs to a method for preparing biodiesel, more specifically, the invention relates to a method for preparing biodiesel with a low freezing point from high acid value oil. Background technique [0002] Due to the depletion of fossil fuel resources and the urgent need for environmental protection, the development of clean energy has attracted more and more attention. From the perspective of environmental protection and resource strategy, energy researchers from all over the world are actively exploring the development of alternative fuels and renewable energy, and biodiesel is one of them. [0003] In the prior art, the production of biodiesel is generally obtained by alcoholysis of oil and methanol, mainly because the reaction speed of methanol is high and the price is cheap. Most of the properties of biodiesel prepared from grease and methanol are close to those of petrochemical diesel, but there is a certain gap between its low tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/04C11C3/10C10L1/02
CPCY02E50/13Y02E50/10
Inventor 刘谋盛杨亚玲夏清海陈开生李冉
Owner YUNNAN MINGHUI PETROCHEM
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