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Biodiesel preparation method

A biodiesel and oil technology, applied in the fields of biofuel, petroleum industry, liquid carbon-containing fuel, etc., can solve the problems of high equipment investment and energy consumption, high energy consumption, complex catalyst preparation process, etc., to achieve strong adaptability of raw materials, High purity and avoid the accumulation of saponification

Inactive Publication Date: 2015-03-11
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

[0032] To produce biodiesel by reacting soybean oil with methanol, the process conditions, material input and output are as follows:

[0033] 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, KF / MMT and Na 2 SiO 3 The mixture is a 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 89%, 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...

Embodiment 2

[0035] 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:

[0036] 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, KF / MMT and Na 2 SiO 3 The mixture is solid alkali, the volume space velocity of the reaction liquid is 4 / h, the temperature of the reactor is 75°C, and the pressure is 6MPa. After the reaction, the oil conversion rate is about 89%. 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...

Embodiment 3

[0038] Using palm oil to react with methanol to produce biodiesel, the process conditions, material input and output are as follows:

[0039]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, KF / MMT and Na 2 SiO 3 The mixture is solid alkali, the volume space velocity of the reaction liquid is 1 / h, the temperature of the reactor is 55° C., and the pressure is 3 MPa. After the reaction, the oil conversion rate reaches 87%. 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 met...

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Abstract

The invention relates to a biodiesel preparation method, which comprises the following steps: 1)oil and fatty alcohol enable an ester interchange reaction under solid alkali condition of a ZnO / Ca(OH)2 / KF, KF / MMT and Na2SiO3 mixture; 2) evaporating fatty alcohol in the reacted mixture, separating glycerin; 3)adding one or more nonionic surfactant in the mixture as a filter aid, separating glyceryl monoaliphatic ester through a ceramic membrane to obtain the high purity biodiesel. The method has the advantages of simple process, strong raw material adaptability and accumulation prevention of saponification substance; oil utilization rate can approach 100%, the biodiesel purity is high, post-treatment is simple, vacuum distillation can be avoided, concentration of the by-product glycerin is high, temperature and pressure required by the ester interchange reaction are low, cost is reduced, biodiesel yield is high, and water-bath heating is used for keeping 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): C11C3/10C10L1/02
CPCC10L1/02C11C3/10Y02E50/10
Inventor 李彦峰资燕李嘉锡
Owner 佛山市天晟隆油脂化工有限公司