Method for preparing biodiesel

A biodiesel and oil technology, which is applied in the fields of biofuel, fatty acid preparation/refining, petroleum industry, etc., can solve the problems such as low temperature fluidity and antioxidant properties of biodiesel, loss of effective components of biodiesel, and increased refrigeration cost, etc. Achieve the effect of alleviating the global energy crisis, avoiding catalyst removal, and convenient operation

Inactive Publication Date: 2011-05-18
TONGJI UNIV
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Problems solved by technology

[0004] At present, there are two main methods for solving the problem of low-temperature fluidity of biodiesel: one is to add a pour point depressant. A method for preparing an improver for low-temperature fluidity of diesel oil. However, due to the wide range of sources of biodiesel raw materials and complex components, there is currently no general-purpose pour point depressant with good performance in the market.
The second is winterization filtration. In the Chinese national patent with the publication number CN1962825A, the inventor pointed out a method of cooling the grease at a low temperature to crystallize the components with a higher freezing point in biodiesel, and then separate the crystal part to improve biological efficiency. The freezing point method of diesel oil, but this method also causes the loss of active components of biodiesel on the basis of increasing the freezing cost
[0006] None of the prior art relates to the method of improving the low-temperature fluidity and oxidation resistance of biodiesel at the same time by using hydrothermal incomplete oxidation technology as shown in the present invention

Method used

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  • Method for preparing biodiesel

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Experimental program
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Embodiment 1

[0031] In the small-scale experiment, the main product after oil hydrolysis-oleic acid was used as the model substance of the unsaturated polymer fatty acid generated after the raw oil hydrolysis; using commercially available 30% H 2 o 2 As the oxidant raw material required in the incomplete oxidation, the reactor adopts a tubular hydrothermal reactor made of SUS316 for a small test experiment.

[0032] This embodiment adopts the following steps:

[0033] 1. Mix 0.7g oleic acid with 1.7ml H 2 o 2 The solution was added to the tubular hydrothermal reactor with a filling rate of 30%. H in the reactor 2 o 2 The concentration is kept at about 3%, so that the amount of oxidizing agent is about oleic acid is completely oxidized to CO 2 and H 2 1% (by molar ratio) of oxygen demand of O, under the conditions of 300° C. and pressure 25-30 MPa, react for 10 minutes to carry out partial selective oxidation reaction.

[0034] 2. After the oxidation reaction is completed, methanol ...

Embodiment 2

[0037] 1. Mix 0.7g oleic acid with 1.7ml H 2 o 2 The solution was added to the tubular hydrothermal reactor with a filling rate of 30%. H in the reactor 2 o 2 The concentration is kept at about 15%, so that the amount of oxidizing agent is completely oxidized to CO 2 and H 25% of O oxygen demand, at 300°C, 5-10MPa, under the condition of 5min for partial selective oxidation.

[0038] 2. After the oxidation reaction is completed, the amount of methanol added is 30 times that of oleic acid (in molar ratio). The hydrothermal esterification reaction is carried out under the condition that the reaction temperature is 350° C., the pressure is 25-30 MPa, and the reaction time is 15 minutes. After the reaction is complete, the product is dealcoholized, the excess low-carbon alcohol is recovered for recycling, and high-quality biodiesel is obtained after rectification dealcoholization. Finally, 0.687g of biodiesel A was obtained.

[0039] The method biodiesel conversion rate re...

Embodiment 3

[0041] 1. Mix 0.7g oleic acid with 1.7ml H 2 o 2 The solution was added to the tubular hydrothermal reactor with a filling rate of 50%. H in the reactor 2 o 2 The concentration is kept at about 20%, so that the amount of oxidizing agent is completely oxidized to CO 2 and H 2 10% of O oxygen demand, at 350 ° C, 20 MPa, under the conditions of reaction 0.5 min for partial selective oxidation.

[0042] 2. After the oxidation reaction is completed, the amount of methanol added is 40 times that of oleic acid (in molar ratio). The reaction temperature is 300° C., 15-20 MPa, and the hydrothermal esterification reaction is carried out under the conditions of reaction for 10 minutes. After the reaction is complete, the product is dealcoholized, the excess low-carbon alcohol is recovered for recycling, and high-quality biodiesel is obtained after rectification dealcoholization. Finally, 0.6866g of biodiesel A was obtained.

[0043] A represents the above-mentioned esterification...

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Abstract

The invention relates to the technical field of environmental engineering, oil chemistry and renewable energy sources, in particular to a method for preparing biodiesel. The method disclosed in the invention comprises the following steps of: conveying fatty acid and an oxidizing agent into a tubular hydrothermal reactor for carrying out selective oxidization treatment on the fatty acid to ensure that unsaturated bonds in the unsaturated fatty acid break to generate micromolecular saturated fatty acid; controlling the reaction conditions that the addition quantity of the oxidizing agent is 1-10 percent of oxygen quantity required for completing oxidizing raw material oil fat into CO2 and H2O, the temperature is 200-350 DEG C, the pressure is 5-30MPa, and the reaction time is 0.5-10min; directly mixing low carbon alcohol with micromolecular saturated fatty acid obtained from the step 1 for esterification to generate high-quality biodiesel with good low-temperature fluidity and strong anti-oxidization resistance; and controlling the reaction conditions that the temperature is 300-400 DEG C, the pressure is 20-35 MPa, the reaction time is 12-30min and the addition quantity of the lower carbon alcohol is 6-40 times that of the fatty acid. According to the method provided by the invention, the low-temperature fluidity and the anti-oxidization property of the biodiesel can be improved.

Description

technical field [0001] The invention relates to the technical fields of environmental engineering technology, oil chemistry and renewable energy, in particular to a method for preparing biodiesel. Background technique [0002] With the depletion of petroleum resources and the gradual improvement of people's awareness of environmental protection, people are paying more and more attention to the substitutes of petroleum fuels. Biodiesel has the advantages of being renewable, biodegradable and environmentally friendly, and is an ideal substitute for petrochemical diesel. [0003] Biodiesel refers to fatty acid methyl ester fuel made from vegetable oil and animal oil through transesterification process. It is a new type of pollution-free renewable energy. However, due to the poor low-temperature fluidity and oxidation resistance of biodiesel, its application range is severely limited. If the low-temperature fluidity and oxidation resistance of biodiesel can be solved, its appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/00C11C3/04C11C1/04C10L1/02
CPCY02E50/13Y02E50/10
Inventor 金放鸣曹江林刘维霍志保
Owner TONGJI UNIV
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