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Method for preparing biodiesel from lipid under supercritical condition

A biodiesel and oil technology, which is applied in the preparation of biological raw materials, biofuels, liquid hydrocarbon mixtures, etc., can solve problems such as difficult industrial production, and achieve the effects of relatively mild reaction conditions, wide adaptability of raw materials, and easy industrial production

Inactive Publication Date: 2009-08-12
SHANDONG PEANUT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the deficiencies and defects of the prior art, the present invention adds an appropriate amount of catalyst to the methanol in the critical state, and solves the problem of preparing biodiesel when the methanol is in a supercritical state, and the production process must be carried out under high temperature and high pressure, making it difficult to carry out industrial production. Thereby provide a kind of new method that supercritical condition utilizes grease to produce biodiesel, and this method is specifically as follows:

Method used

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  • Method for preparing biodiesel from lipid under supercritical condition
  • Method for preparing biodiesel from lipid under supercritical condition
  • Method for preparing biodiesel from lipid under supercritical condition

Examples

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Embodiment 1

[0020] Embodiment 1, prepare biodiesel with grease

[0021] In the first step, 10 kilograms of grease, 6 grams of concentrated hydrochloric acid (36%wt) and methanol are mixed, wherein the mol ratio of methanol to grease is 40:1;

[0022] In the second step, react for 6 minutes at 240°C, pressure 10MPa, and stirring intensity 400r / min;

[0023] In the third step, the reaction is completed, and the solution is poured into a separatory funnel and allowed to stand overnight for stratification;

[0024] In the fourth step, take the upper layer solution and wash and dry it repeatedly to obtain 9.937KG of yellow, clear and transparent biodiesel.

Embodiment 2

[0025] Embodiment 2, the influence of temperature of reaction on transesterification reaction

[0026] The present invention is implemented under the conditions of alcohol-oil molar ratio 40 / 1, reaction pressure 10MPa, catalyst consumption 0.06%, reaction time 6min stirring intensity 400r / min, the influence of different reaction temperatures on biodiesel yield is shown in figure 1 . from figure 1 It can be seen that the biodiesel yield increases with increasing temperature. As the temperature increases, the activity of the reactants increases, the reaction speed increases, and the yield of biodiesel increases. When the temperature reaches 240°C, methanol reaches the supercritical point, and the yield of biodiesel increases significantly. If the temperature continues to rise, the increase in biodiesel yield is not obvious. If the temperature is too high, the energy consumption and manufacturing cost of the equipment will be increased, and the unsafe factors will also be incr...

Embodiment 3

[0027] Embodiment 3, the influence of supercritical pressure on transesterification reaction

[0028] Implement the present invention under the conditions of alcohol-oil molar ratio 40 / 1, catalyst consumption 0.06%, reaction time 6min, reaction temperature 240 ℃, stirring intensity 400r / min, the influence of reaction pressure on biodiesel yield is shown in figure 2 . from figure 2 It can be seen that when methanol does not reach the supercritical state, the reaction is very slow, and the yield of biodiesel is very low. With the increase of pressure, methanol reaches the supercritical state, and the yield of biodiesel increases rapidly. When the pressure reaches 10MPa, As the pressure increases, the yield of biodiesel does not increase significantly, and the reaction pressure is too high, the color of biodiesel will deepen, and it will also increase equipment investment, energy consumption and equipment maintenance costs, and also increase unsafe factors. Therefore, this st...

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Abstract

The invention discloses a method for preparing biodiesel from grease under supercritical conditions, which belongs to the technical field of biodiesel production by the grease. The method comprises the following steps : step one, mixing the grease, concentrated hydrochloric acid which accounts for 0.06 percent of the mass of the grease and methanol, wherein the molar ratio of the methanol to the grease is 35-45: 1; step two, reacting for 4 to 8 minutes under the conditions that the temperature is between 240 and 260 DEG C, the pressure is between 9 and 12MPa and the stirring intensity is 400r / min; step three, finishing the reaction, and pouring the solution into a separatory funnel for standing overnight and layering; and step four, taking supernatant solution, and obtaining the biodiesel after the repeated washing and drying. The method for preparing the biodiesel from the grease has the biodiesel yield reaching 99.37 percent, has broad raw material adaptability and relatively mild reaction conditions, and is easy to realize the industrialized production.

Description

technical field [0001] The invention relates to a new method for producing biodiesel from oil, which belongs to the technique of producing biodiesel from oil. Specifically, when methanol is in a supercritical state, a small amount of concentrated hydrochloric acid is added as a catalyst to prepare biodiesel. Background technique [0002] Biodiesel is a clean and safe new fuel that can replace petrochemical diesel produced from renewable resources such as vegetable oil or animal oil. The main components are ester compounds formed by long-chain saturated unsaturated fatty acids such as palmitic acid, stearic acid, oleic acid, linoleic acid and methanol or ethanol. Biodiesel has the characteristics of renewable, easy biodegradation, low combustion pollutant emissions, and low greenhouse gas emissions. Biodiesel has similar properties to petrodiesel. And it has its unparalleled advantages: (1) It has excellent environmental protection characteristics. (2) It has better low-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 杨庆利禹山林朱凤于丽娜毕洁张初署
Owner SHANDONG PEANUT RES INST
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