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Method for deacidifying biodiesel

A biodiesel and deacidification technology, which is applied in the fields of biofuel, petroleum industry, fat production, etc., can solve the problems of increased energy consumption, no other removal of biodiesel, huge equipment, etc., and achieve the effect of reducing the acid value

Active Publication Date: 2011-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Using a high ratio of alcohol to oil and adding a large amount of co-solvent will make the device huge, increase energy consumption, and inevitably produce acid-base residues that are difficult to handle
[0009] Apparently, apart from the above supplementary catalytic esterification deacidification, there are no other reports on the removal of organic acid impurities in biodiesel.

Method used

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  • Method for deacidifying biodiesel
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  • Method for deacidifying biodiesel

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Crude biodiesel feedstock: acid value 9.8mgKOH / g

[0028] Deacidification agent composition (mass fraction): 40% methanol + 55% water + 5% ammonia

[0029] Take 100mL of crude biodiesel, put it in a 250mL separating funnel, put it in a 60°C water bath, add 30ml of deacidification agent, keep the temperature for 30min, shake it fully for 5min, and let it stand in the water bath for 10min. It is found that the two phases are clearly separated, and the lower water phase From colorless to deep yellow, the two phases were separated and the following treatments were carried out respectively.

[0030] At 60°C, wash the upper oil phase with water: oil = 1: 10 and settling and dehydrating, then measure the acid value of the oil phase; transfer the lower water phase to a distillation flask for atmospheric flash evaporation, reclaim the distillate, and remove the tail Insert the connecting tube into the receiving bottle, absorb the distilled gas and liquid with water, and measure...

example 2

[0035] Crude biodiesel raw material: acid value 8.70mgKOH / g;

[0036] Deacidification agent composition (mass fraction): 55% ethanol + 42% water + 3% ammonia.

[0037] Refined mixer: Φ10×500mm fiber membrane reactor, fiber wire material is 316L stainless steel, stainless steel wire diameter is 0.10mm, and the effective filling rate of refined mixer is 51%.

[0038] Two micropumps are used to measure crude biodiesel and deacidification agent respectively. After preheating the crude biodiesel to 70°C, the two enter the reactor at the same time at 1000mL / h and 200mL / h respectively. The bottom of the settling tank at the lower end collects the water phase, and the outlet at the top of the settling tank collects deacidified biodiesel.

[0039] The collected oil phase and water phase were treated by a method similar to that of Example 1, and the results obtained are shown in Table 2.

[0040] Table 2 Fiber membrane contact deacidification test results

[0041]

Embodiment 3

[0043] Biodiesel methylated material: acid value 8.7mgKOH / g, containing about 8% (mass fraction) of unseparated glycerin, 0.5% (mass fraction) of methanol, and the rest being fatty acid methyl esters.

[0044] Deacidification agent composition (mass fraction): 10% ammonia + 90% water.

[0045] Refined mixer: Φ10×500mm fiber membrane reactor, fiber wire material is 316L stainless steel, stainless steel wire diameter is 0.10mm, and the effective filling rate of refined mixer is 51%.

[0046] Two micropumps were used to meter crude biodiesel and deacidification agent containing glycerol and methanol respectively. After the biodiesel was preheated to 70°C, the two were simultaneously fed into the reactor at 1000mL / h and 250mL / h respectively. The bottom of the settling tank at the lower end of the fiber membrane reactor collects the water phase, and the outlet at the top of the settling tank collects deacidified biodiesel.

[0047] The collected oil phase and water phase, for the ...

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Abstract

The invention provides a method for deacidifying biodiesel, comprising the following steps of: mixing the biodiesel to be deacidified with a deacidification agent containing water-soluble alcohol, water-soluble amine and water, separating out an oil phase and an aqueous phase after layering, and refining the oil phase to obtain the biodiesel with a qualified acid value. The biodiesel to be deacidified can be a biodiesel intermediate with unseparated glycerol after the ester exchange between oil and alcohol, and can also be crude biodiesel which is removed with the glycerol or / and has a product acid value still out of limits after distillation for colloid removal. The method in the invention not only can be used for conveniently removing organic acid in the biodiesel and obviously reducing the acid value of the biodiesel, but also can be used for effectively reusing or recovering the organic acid and glycerol.

Description

technical field [0001] The invention relates to a method for deacidifying biodiesel. Background technique [0002] Mineral energy such as coal and petroleum resources and other non-renewable energy sources are rapidly being consumed, and renewable energy sources such as biofuels based on biomass are receiving increasing attention. Among them, biodiesel is the product of transesterification between animal and vegetable oils and methanol (a variety of fatty acids A mixture of methyl esters), generally composed of C 10 ~C 20 The methyl ester composition of fatty acids is usually not used alone, but blended into petrochemical diesel in a certain proportion. [0003] At present, there are many technologies for obtaining biodiesel from vegetable oil and methanol through transesterification, such as: CN101126031; CN101134904; US7,420,072; US7,112,229 and so on. [0004] The presence of acidic substances in diesel oil will affect the performance and life of diesel engine oil. Bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B3/00C10L1/02
CPCY02E50/13Y02E50/10
Inventor 吴明清李涛黄燕民潘光成
Owner CHINA PETROLEUM & CHEM CORP
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