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Preparation method of high-purity biodiesel

A biodiesel and high-purity technology, applied in biofuel, bio-raw material, petroleum industry, etc., can solve the problems of high equipment investment and energy consumption, complex catalyst preparation process, high energy consumption, etc., to achieve strong adaptability of raw materials and avoid saponification The effect of substance accumulation and high purity

Active Publication Date: 2011-11-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in the process
Firstly, the catalyst preparation process is complicated, the energy consumption is high, and waste water, waste gas, etc. need to be treated at the same time.
Moreover, in the biodiesel production process, catalyst loading, deactivation and disposal will bring new problems
More importantly, under relatively harsh reaction conditions, the oil undergoes a two-stage reaction. The temperature needs to be lowered in the middle, and then the temperature is raised to pressurize the reaction to achieve a final yield of about 10%, which makes the equipment investment and energy efficiency of the process higher consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] To produce biodiesel by reacting soybean oil with methanol, the process conditions, material input and output are as follows:

[0023] Send methanol and soybean oil into a tubular reactor for reaction, the reaction conditions are: the molar ratio of alcohol to oil is 12:1, potassium oleate is 0.08% of the mass of soybean oil, and the volume space velocity of the reaction liquid is 0.5h -1 , the reaction temperature is 280°C, and the pressure is 8MPa. The reacted material was depressurized and flashed to remove methanol, then the temperature was lowered to 40°C, and glycerol was centrifuged. In the obtained methyl ester phase, the mass concentration of methyl ester exceeds 95%, and the mass concentration of monoglyceride is 5%. Next, after mixing 4% of Span80 (sorbitan monooleate, hydrophilic-lipophilic balance value is about 4.3) in the methyl ester phase, under the transmembrane pressure difference of 0.15MPa, through the pore size of 0.2μm The ceramic membrane is us...

Embodiment 2

[0025] Cottonseed oil with an acid value of 10mgKOH / g is reacted with methanol to produce biodiesel. The process conditions, material input and output are as follows:

[0026] Send methanol and cottonseed oil into a tubular reactor for reaction, the molar ratio of alcohol to oil is 25:1, KOH is 0.3‰ of the mass of soybean oil, and the volume space velocity of the reaction liquid is 5h -1 , the reactor temperature is 260°C, and the pressure is 6MPa. After the reaction, the oil conversion rate is about 90%. The reacted material was decompressed and flashed to remove methanol, then the temperature was lowered to 50°C, and glycerin was separated by sedimentation. In the oil phase after separation of glycerin, the mass concentration of monoglycerides is 12%. Next, after mixing 1% Tween80 (polyoxyethylene sorbitan monostearate, hydrophilic-lipophilic balance value is about 15.0) in the methyl ester phase, under the transmembrane pressure difference of 0.2MPa, through the pore diam...

Embodiment 3

[0028] Using palm oil to react with methanol to produce biodiesel, the process conditions, material input and output are as follows:

[0029] Send methanol and palm oil into a tubular reactor for reaction, the molar ratio of alcohol to oil is 9:1, the NaOH is 0.1‰ of the mass of soybean oil, and the volume space velocity of the reaction liquid is 1h -1, the reactor temperature is 200°C, and the pressure is 4MPa. After the reaction, the oil conversion rate exceeds 80%. The reacted material was depressurized and flashed to remove methanol, then the temperature was lowered to 30°C, and glycerin was separated by sedimentation. In the oil phase after separation of glycerin, the mass concentration of monoglycerides is about 13%. Next, after mixing 2% Pingpinga O-25 (high-carbon aliphatic alcohol polyoxyethylene ether, hydrophilic-lipophilic balance value is about 17) in the methyl ester phase, under the transmembrane pressure difference of 0.25MPa, through the pore diameter A cer...

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Abstract

The invention relates to a preparation method of high purity biodiesel. The method comprises steps that: (1) grease and fatty alcohol are subject to an ester interchange reaction with almost no basic catalyst; (2) fatty alcohol in a reaction product, which is a mixture, is removed through steaming, and glycerin is separated; (2) one or more nonionic surfactants are added to the mixture obtained from the step (2) as filter aids, and fatty acid monoglyceride is separated by a ceramic membrane, such that high purity biodiesel is obtained. According to the invention, the technology of the invention is simple; raw material adaptability is relatively high; a saponification product accumulation problem is avoided; utilization rate of grease approaches 100%; biodiesel purity is high; post-treatment is simple; and a problem of a high concentration of a vacuum distillation by-product glycerin is solved.

Description

technical field [0001] The invention relates to the technical field of biomass energy, in particular to a method for preparing biodiesel. Background technique [0002] As people pay more and more attention to environmental issues and oil prices continue to rise, biodiesel, as a green renewable energy source, has become an important alternative fuel for petrochemical diesel. The transesterification method is the most widely used biodiesel production method, that is, animal and vegetable oils and lower alcohols (such as methanol or ethanol) are transesterified to obtain fatty acid lower alcohol esters. Due to methanol's high reactivity and low price, the most typical biodiesel is fatty acid methyl ester. [0003] Fatty acid, that is, triglycerides of fatty acids, undergoes transesterification with lower alcohols, and is converted into diacylglycerols, monoglycerides in turn, and finally lower alcohol esters of fatty acids and glycerin are obtained. Since the transesterificat...

Claims

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Application Information

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IPC IPC(8): C11C3/10C10L1/02
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 张家仁闵恩泽杜泽学
Owner CHINA PETROLEUM & CHEM CORP
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