Two-step method for preparing biodiesel

A technology of biodiesel and two-step method, which is applied in the direction of biofuel, biological raw material, petroleum industry, etc., can solve the problems of complex catalyst preparation process and high energy consumption, and achieve the effect of strong adaptability, high concentration and high purity of raw materials

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Soybean oil and methanol are reacted to produce fatty acid methyl ester and glycerol. The process conditions, material input and output are as follows:

[0024] The mixture of methanol and soybean oil is sent into a tubular reactor for reaction, wherein the molar ratio of alcohol to oil is 12:1, potassium stearate is 0.08% of the mass of soybean oil, and the volume space velocity of the reaction liquid is 0.4h -1 , the reaction temperature is 280°C, and the pressure is 8MPa. After the first reaction, the oil conversion rate exceeds 96%. The pressure of the reaction mixture was directly reduced to normal pressure, methanol was recovered by flash evaporation, and then the temperature was lowered to 50° C., and stood for 4 hours to separate glycerin. The crude ester phase after the separation of glycerin, and supplemented methanol are sent to a tubular reactor for reaction, wherein the molar ratio of alcohol to oil is 12:1, and dimethyl carbonate and potassium stearate ar...

Embodiment 2

[0026] Cottonseed oil reacts with mixed fatty alcohols to produce biodiesel and glycerin. The process conditions, material input and output are as follows:

[0027] The mixed fatty alcohol is methanol solution containing 20wt% ethanol. The mixture of cottonseed oil and fatty alcohol is sent into a tubular reactor for reaction, wherein the molar ratio of alcohol to oil is 40:1, KOH is 0.05% of the quality of cottonseed oil, the reaction temperature is 250°C, the pressure is 6MPa, and the volume of the reaction solution Airspeed is 10h -1 . After the first reaction, the oil conversion rate is about 98%. The pressure of the reacted mixture was reduced to one atmospheric pressure, the fatty alcohol was recovered by flash evaporation, and then the temperature was lowered to 60° C., and the glycerol was centrifuged at 4000 rpm. The crude ester phase after separation of glycerin and supplemented fatty alcohol are fed into a tubular reactor for reaction, wherein the molar ratio of ...

Embodiment 3

[0029] Rapeseed oil reacts with methanol to produce fatty acid methyl ester and glycerol. The process conditions, material input and output are as follows:

[0030] Rapeseed oil and methanol, according to the molar ratio of alcohol to oil 15:1, are sent into the tubular reactor for reaction, wherein, NaOH is 0.03% of the mass of rapeseed oil, and the volume space velocity of the reaction liquid is 2h -1, the reactor temperature is 200°C, and the pressure is 4MPa. After the first reaction, the oil conversion rate is about 85%. The pressure of the reaction mixture was reduced, and the methanol was recovered by flash evaporation under normal pressure, and then the temperature was lowered to 50° C., and the mixture was allowed to stand for 4 hours to separate glycerin. The crude ester phase after separation of glycerin, and supplemented methanol are sent to a tubular reactor for reaction, wherein the molar ratio of alcohol to oil is 30:1, and dimethyl ether and NaOH are 10% and 0...

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Abstract

The invention relates to a method for preparing biodiesel by a two-step process, which comprises the following steps: (1) supplying grease and fatty alcohol to a reactor, reacting at 190-300 DEG C under the pressure of 3-11 MPa, and separating fatty alcohol and glycerol from the crude product after reaction to obtain the crude ester phase; and (2) supplying the crude ester phase and fatty alcoholto the reactor, adding ethers, carbonates and / or carboxylates containing methoxy or oxyethyl functional groups, reacting at 190-300 DEG C under the pressure of 3-11 MPa, and collecting the biodiesel from the mixture after reaction. The invention has the advantages of simple technique, strong adaptability of raw materials, high biodiesel purity, simple after-treatment, clean production process andhigh concentration of the byproduct glycerol, and the grease utilization ratio approaches to 100%.

Description

technical field [0001] The invention relates to the technical field of biomass energy, in particular to a process for producing biodiesel by reacting animal and vegetable oils with fatty alcohols as raw materials. 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 one of the important alternative fuels for petrochemical diesel. The transesterification method is the most widely used biodiesel production method, that is, the fatty acid lower alcohol ester is obtained through the transesterification reaction of oil and lower alcohol (such as methanol or ethanol). 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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