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Method for lowering acid value of biodiesel

A technology of biodiesel and acid value, which is applied in the fields of biofuel, petroleum industry, and fat production, etc. It can solve the problems that the acid value of biodiesel is difficult to meet the requirements, the equipment investment is large, and the production cost is high, so as to reduce the water consumption of washing and improve the quality of finished products. Quality, the effect of solving corrosion

Inactive Publication Date: 2011-11-09
CHONGQING HAOTAI ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the issue of reducing the acid value of biodiesel, it is usually to add NaOH, KOH and other lye to neutralize the fatty acid to reduce the acid value, and the lye will react with fatty acid and fatty acid ester to form saponified products containing sodium, potassium, etc. The saponified matter is emulsified seriously in the later washing and refining process, so the amount of lye added is restricted, so that the acid value of biodiesel is still difficult to meet the requirements, and the process is long, the equipment investment is large, the pollution is serious, and the production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: in the stirring type reaction container of volume 5L, add the biodiesel 2kg that contains excess fatty acid, its acid value is 2.80mgKOH / g, be warming up to 70 ℃; Add mass concentration and be 10% potassium hydroxide solution 50ml, Stir and react at constant temperature for 10 minutes; then add 70ml of calcium nitrate solution with a mass concentration of 10%, and stir and react at constant temperature for 10 minutes; add 0.4kg of water at 75°C and stir for 2 minutes, then heat and settle at 70°C for 30 minutes, and analyze the acid value of the product from the upper layer 0.12mgKOH / g, the deacidification rate is 95.7%.

Embodiment 2

[0019] Embodiment 2: in the stirring type reaction container of volume 5L, add the biodiesel 2kg that contains excess fatty acid, its acid number is 4.68mgKOH / g, be warming up to 70 ℃; Add mass concentration and be 8% potassium hydroxide solution 100ml, Stir at a constant temperature for 10 minutes; then add 140ml of calcium nitrate solution with a mass concentration of 8%, and stir for 10 minutes at a constant temperature; add 0.4kg of water at 75°C and stir for 2 minutes, then heat and settle at 70°C for 30 minutes, and analyze the upper layer to obtain the acid value of the product 0.18mgKOH / g, the deacidification rate is 96.2%.

Embodiment 3

[0020] Embodiment 3: in the stirring type reaction vessel of volume 5L, add the biodiesel 2kg that contains excess fatty acid, its acid value is 3.32mgKOH / g, be warmed up to 70 ℃; Add mass concentration and be 10% sodium hydroxide solution 55ml, Stir and react at constant temperature for 10 minutes; then add 80ml of calcium chloride solution with a mass concentration of 10%, and stir and react at constant temperature for 10 minutes; add 0.4kg of water at 75°C and stir for 2 minutes, then heat and settle at 70°C for 30 minutes, and analyze the acid value of the product by taking the upper layer of material It is 0.22mgKOH / g, and the deacidification rate is 93.4%.

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Abstract

The invention discloses a method for lowering the acid value of biodiesel. The method comprises the following steps of: mixing biodiesel containing surplus fatty acid with an inorganic strongly alkaline solution in a reactor for reacting and adding an inorganic calcium salt solution for mixing and reacting; and performing subsequent treatment such as centrifugal water-washing separation, drying, vacuum distillation and the like on mixed liquor. The method has the advantages that: fatty acid is neutralized with alkaline liquor to lower the acid value of biodiesel, and a neutralized alkali metal saponified substance reacts with the inorganic calcium salt solution to be transformed into water-dissoluble calcium soap for separating and removing, so that the alkali metal saponified substance is prevented from being emulsified severely in the water washing process, the acid value of biodiesel is lowered effectively, the quality of finished biodiesel is enhanced, the process difficulty is lowered, the amount of water for water washing is decreased, and meanwhile, the problem of corrosion of high-acid-value biodiesel on using equipment is solved.

Description

technical field [0001] The invention relates to a method for reducing the acid value of biodiesel. Background technique [0002] With the increasingly tense use of energy in the world, finding various new energy sources that can replace fossil energy sources has become one of the important research tasks of all countries in the world today. Biodiesel has attracted much attention in recent years because of its great advantages in power performance, environmental protection performance and safety performance, and has developed rapidly. The active ingredients of biodiesel are mainly fatty acid esters, which are divided into fatty acid methyl esters and fatty acid ethyl esters according to the materials selected to react with oil during production, and the excess oil after the reaction is mixed with the active ingredients of biodiesel. Most of the oil is waste oil, and its quality is difficult to control, resulting in high acid value of the product, which does not meet the BD10...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B3/04C11B3/00C10L1/02
CPCY02E50/13Y02E50/10
Inventor 陈恒顺严小建沈建平
Owner CHONGQING HAOTAI ENERGY CO LTD
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