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Preparation method of biodiesel

A biodiesel and oil technology, applied in the preparation of organic compounds, hydroxyl compounds, biofuels, etc., can solve the problems of high equipment investment and energy consumption, complex catalyst preparation process, high energy consumption, and achieve strong adaptability of raw materials, The effect of avoiding accumulation of saponification and high purity

Inactive Publication Date: 2015-01-07
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 and KF / MMT 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 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 the pore size of 0.2μm...

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 and KF / MMT 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 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 about 15.0) in the methyl ester phas...

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 and KF / MMT mixture solid base, the reaction liquid volume space velocity is 1 / h, the reactor temperature is 55°C, and the pressure is 3MPa. 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 methyl ester phase, under the transmembrane...

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Abstract

The invention discloses a preparation method of biodiesel. The preparation method comprises the following steps: 1) carrying out transesterification on grease and fatty alcohol under the condition of ZnO / Ca(OH)2 / KF and KF / MMT mixture solid base; 2) steaming out the fatty alcohol from the mixture after the reaction and separating the glycerinum; 3) adding one or more nonionic surfactants in the mixture obtained in the step 2) to serve as filter aids, separating the fatty acid monoglyceride through a ceramic membrane to obtain the high-purity biodiesel. According to the preparation method, the process is simple, the adaptability of raw materials is relatively high, the problem of saponified matter accumulation is avoided, the grease utilization rate can be close to 100%, the purity of the biodiesel is high, the aftertreatment is simple, the reduced pressure distillation is avoided, the concentration of the byproduct glycerinum is high, the temperature and the pressure required by the transesterification are low, the cost is reduced, the yield of the biodiesel is high, and water-bath heating is used, so that the reaction temperature is constant.

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): C11C3/10C10L1/02B01J27/138C07C31/22C07C29/80
CPCB01J27/138C07C29/1285C07C29/80C10L1/02C11C3/10C07C31/225Y02E50/10
Inventor 李彦峰资燕李嘉锡
Owner 佛山市天晟隆油脂化工有限公司