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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 of high equipment investment and energy consumption, complex catalyst preparation process and high energy consumption, achieve strong adaptability of raw materials, avoid The effect of accumulation of saponification and high purity

Inactive Publication Date: 2014-12-24
佛山市天晟隆油脂化工有限公司
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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

[0037] To produce biodiesel by reacting soybean oil with methanol, the process conditions, material input and output are as follows:

[0038] Methanol and soybean oil are fed into a tubular reactor for reaction, and the reaction conditions are: the molar ratio of alcohol to oil is 12:1, adding 2% ZnO / Ca(OH) of soybean oil quality 2 / KF and Na 2 SiO 3 / CaO / KF mixture solid base, the volume space velocity of the reaction solution is 0.5 / h, the reaction temperature is 65°C, and the pressure is 5MPa. 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 reaches 90%, 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...

Embodiment 2

[0040] 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:

[0041] Send methanol and cottonseed oil into a tubular reactor for reaction, the molar ratio of alcohol to oil is 15:1, KOH is 0.3‰ of the mass of soybean oil, and ZnO / Ca(OH) of 3% of the mass of soybean oil is added 2 / KF and Na 2 SiO 3 / CaO / KF mixture solid base, the reaction liquid volume space velocity is 4 / h, the reactor temperature is 75°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 meth...

Embodiment 3

[0043] Using palm oil to react with methanol to produce biodiesel, the process conditions, material input and output are as follows:

[0044] Methanol and palm oil are fed into a tubular reactor for reaction, the molar ratio of alcohol to oil is 9:1, NaOH is 0.1‰ of soybean oil quality, and ZnO / Ca(OH) of 4% soybean oil quality is added 2 / KF and Na 2 SiO 3 / CaO / KF mixture solid base, the volume space velocity of the reaction solution is 1 / h, the reactor temperature is 55°C, and the pressure is 3MPa. After the reaction, the oil conversion rate reaches 88%. 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% Pingjia O-25 (high-carbon aliphatic alcohol polyoxyethylene ether, hydrophilic-lipophilic balance value is about 17) in the methyl ester phase,...

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Abstract

A method for preparing biodiesel includes the steps of 1 subjecting oil and fat and fatty alcohol to transesterification under the condition of solid base of zinc oxide / calcium hydroxide / potassium fluoride and sodium silicate / calcium oxide / potassium fluoride mixture; 2 evaporating fatty alcohol from a reacted mixture and separating glycerol; 3 adding one or more non-ionic surfactants serving as filter aids to a mixture obtained in step 2 and separating fatty monoglyceride through a ceramic membrane to obtain high-purity biodiesel. The method for preparing biodiesel is simple in process, high in adaptability of raw materials and capable of avoiding the problem of saponification accumulation, achieving an oil and fat utilization rate close to 100%, high biodiesel purity and simple post-treatment, omitting reduced pressure distillation, obtaining high concentration of byproduct glycerol, requiring low temperature and pressure for transesterification, reducing costs, realizing high yield of biodiesel and using water bath for heating to achieve constant reaction temperature.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/00C11C3/10C11C1/08C10L1/02
CPCY02E50/10
Inventor 李彦峰资燕李嘉锡
Owner 佛山市天晟隆油脂化工有限公司
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