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Method for preparing biodiesel

A biodiesel and oil technology, applied in the direction of preparation of biological raw materials, biofuels, liquid hydrocarbon mixtures, etc., can solve the problems of water cannot be removed in time, long reaction time, large amount of methanol, etc., to achieve industrial production, low specific gravity, Reduce the effect of post-treatment processes

Inactive Publication Date: 2009-09-16
江苏悦达卡特新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The conventional esterification reaction is carried out under high temperature and high pressure conditions. During the esterification reaction, while the fatty acid methyl ester is formed due to the continuous dehydration of the oil, the water produced in the reaction cannot be eliminated in time and will be mixed with methanol. Although it can be removed by adding excess methanol Guaranteed esterification reaction, but as the reaction time increases, a reverse reaction occurs due to the increase in the amount of water
Furthermore, since the boiling point of methanol is 64.7°C, and the reaction temperature in the reactor is higher than the boiling point of methanol, methanol is continuously vaporized and evaporated during the stirring process to gradually reduce the concentration of methanol, so the amount of methanol is large and energy consumption is increased. , long reaction time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The invention adopts animal oil to prepare biodiesel.

[0013] Add 1 mole (300 grams) of oil and 3 moles of anhydrous methanol (96 grams) or 3 moles of absolute ethanol (138 grams) into the reactor, stir under cooling conditions, when the temperature drops to 10 ~ At 15°C, slowly add 1 mole (119 grams) of thionyl chloride catalyst dropwise and continue to stir for esterification reaction. The temperature of the esterification reaction is controlled at 10-15°C. After the dropwise addition, continue to stir for 1 hour, and the esterification The reaction is over. Cool the liquid material after the esterification reaction, and when the temperature of the liquid material drops to 5-20°C, slowly add 1.2 moles (142.8 grams) of water dropwise, let the mixed liquid material after adding water stand still or centrifuge to separate layers, and release The glycerol of the mixed liquid material of the lower floor, in obtaining the upper mixed liquid material containing biodiesel, ...

Embodiment 2

[0015] The invention adopts vegetable oil to prepare biodiesel.

[0016] Add 1 mole (280 grams) of oil and 6 moles of anhydrous methanol (192 grams) or 6 moles of absolute ethanol (276 grams) into the reaction kettle, stir under cooling conditions, when the temperature drops to 10~ At 15°C, slowly add 1.5 moles (179 grams) of thionyl chloride catalyst dropwise and continue to stir for esterification reaction. The temperature of the esterification reaction is controlled at 5-10°C. After the reaction is finished, the liquid material after the esterification reaction is cooled, and when the temperature of the liquid material drops to 10-25° C., slowly add 1.5 moles (27 grams) of water, and the mixed liquid material after adding water is left to stand or centrifuged. layer, emit the glycerin of the mixed liquid material of the lower floor, and add an alkaline solution to adjust the pH value in the upper mixed liquid material containing biodiesel, such as adding the sodium hydroxid...

Embodiment 3

[0018] The invention adopts animal and vegetable mixed oil to prepare biodiesel.

[0019] Add 1 mole (320 grams) of oil and 4 moles of anhydrous methanol (128 grams) or 4 moles of absolute ethanol (184 grams) into the reaction kettle, stir under cooling conditions, and when the temperature drops to 10~ At 15°C, slowly add 1.2 moles (142.8 grams) of thionyl chloride catalyst dropwise and continue to stir for esterification reaction. The temperature of the esterification reaction is controlled at 5 to 15°C. After the dropwise addition, continue to stir for 0.8 hours. After the reaction is finished, the liquid material after the esterification reaction is cooled, and when the temperature of the liquid material drops to 20-30° C., slowly add 1.5 moles (27 grams) of water, and the mixed liquid material after adding water is left to stand or centrifuged. layer, emit the glycerol of the mixed liquid material of the lower floor, add the alkaline aqueous solution of sodium hydroxide wi...

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Abstract

The invention relates to a method for preparing biodiesel, which comprises the following steps: adding grease and absolute methanol into a reaction kettle according to the ratio of 1:3-1:6 (molar ratio), and stirring the grease and the absolute methanol under the cooling condition; when the temperature is reduced to between 5 and 15 DEG C, slowly adding a thionyl chloride catalyst which is 1 to 1.5 times (mol) of the grease dropwise, continuously stirring for esterification reaction, controlling the temperature of the esterification reaction between 5 and 15 DEG C, and continuously stirring for 0.5 to 1 hours after the dropwise addition; cooling a liquid material after the esterification reaction, and slowly adding water dropwise when the temperature of the liquid material is between 5 and 30 DEG C; standing or centrifugally layering the mixed liquid material added with water, discharging glycerin of the lower-layer liquid material, and adding alkaline solution to the upper-layer mixed liquid material containing the biodiesel to regulate pH value to between 7 and 8; and washing the upper-layer mixed liquid material to neutrality, and distilling the upper-layer mixed liquid material under reduced pressure to obtain the biodiesel. The method has low energy consumption, short reaction time and high biodiesel conversion rate.

Description

technical field [0001] The invention relates to a method for preparing biodiesel. Background technique [0002] Biodiesel uses various animal and vegetable oils as raw materials, undergoes transesterification with methanol and other low-carbon alcohols, and finally turns it into a fuel for internal combustion engines—fatty acid methyl esters. Biodiesel has excellent environmental protection performance, low sulfur content, the emission of sulfur dioxide and sulfide is about 30% lower than that of ordinary diesel, the oxygen content can reach 11%, and the ignition performance is good, so the harmful substances such as HC and CO emitted during combustion Compared with ordinary diesel oil, it is greatly reduced. Because its emission does not contain harmful substances such as sulfur dioxide, lead, and halogen, it is very beneficial to environmental protection and meets environmental protection requirements. It is used as a new renewable energy source to partially replace minera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G3/00C11C3/04
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 李乐平吴杰张伟明贾琰
Owner 江苏悦达卡特新能源有限公司