CN103374461A - Method for preparing biodiesel by using vegetable oil - Google Patents
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- CN103374461A CN103374461A CN2012101251667A CN201210125166A CN103374461A CN 103374461 A CN103374461 A CN 103374461A CN 2012101251667 A CN2012101251667 A CN 2012101251667A CN 201210125166 A CN201210125166 A CN 201210125166A CN 103374461 A CN103374461 A CN 103374461A
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Abstract
The invention discloses a method for preparing biodiesel by using vegetable oil. The method for preparing biodiesel by using vegetable oil comprises the following steps of: firstly, acquiring an oil phase solution obtained through the pre-esterification reaction of vegetable oil; then, heating the oil phase solution to the temperature between 60 DEG C and 85 DEG C by utilizing a microwave heating method, and adding a homogeneous base catalyst and first alcohol into the oil phase solution, thereby obtaining a transesterification solution; separating the biodiesel from the transesterification solution after the transesterification solution is cooled down. Because the microwave heating method has the advantages of rapid heating, uniform heat transfer and the like, the transesterification reaction time can be shortened to be within 4 seconds and 30 minutes; on the other hand, the biodiesel obtained finally also has high transfer rate and high selection rate, so that the method is used for completing the biodiesel production within a short time under the situation of not sacrificing the biodiesel quality.
Description
Technical field
The present invention relates to a kind of preparation method of biodiesel, relate in particular to a kind of method of using vegetables oil to prepare biodiesel.
Background technology
The exhausting of the energy on the earth is the subject under discussion that continues for a long time to receive publicity, and more each side desires most ardently the problem of solution, and product official educational circles also drops into ample resources already, gets down to research and the production of substitute energy.Wherein, especially with the tight related petroleum-based energy of national economic development and people's livelihood demand, come into one's own most.Present stage, greatly mainly with the substitute energy of biodiesel (Biodiesel) as oil, the biodiesel general reference utilizes vegetables oil to make the biomass energy of diesel oil, is mainly used in the fuel of transportation means.
Prepare the correlation technique of biodiesel with vegetables oil, mainly be divided into Physical and chemical method.Physical is to have high-energy-density and combustible characteristic as the basis take animal-plant oil, makes biofuel.In principle, because vegetables oil contains the different material of saturation ratio, can make the lubricating oil generation polymerization on the diesel motor, therefore, crude vegetables oil only can directly use in diesel motor at short notice; And vegetables oil is different with the diesel oil molecules structure, and this probably further causes the problems such as atomization badness, incomplete combustion, spray nozzle clogging.As for chemical method, be that triglyceride is changed its molecular structure via chemical reaction, and then produce the fatty acid methyl ester of strand, i.e. biodiesel.Because chemical method can fundamentally improve flowability and the viscosity of biodiesel, and conforms to the characteristic of petrifaction diesel for the biodiesel that obtains with this legal system, therefore, at present industrial most employing chemical method is made biodiesel.
Chemical method is mainly take transesterification as main, at first, transesterification (Trans-esterification reaction) is the reaction generation lipid acid by triglyceride and short chain alcohol, in other words, this reaction utilizes short chain alcohol to replace the interior glycerine of triglyceride, forms the fatty acid ester of strand, after reaction, the fatty acid ester flowability of strand greatly improves, and viscosity also reduces many.Its three stages transesterification formula is as follows:
The change that affects transesterification is because of the kind of the mole ratio that mainly comprises oil and alcohol, short chain alcohol, catalyst kind etc.At first, transesterification is reversible reaction, and in the reaction formula chemical dose of oil and alcohol to count ratio be 1 to 3, for the direction that makes the past methyl esters of chemical equilibrium moves, usually can add excessive alcohol and improve reaction yield, its mole ratio major part is made as 1 to 6; Secondly, carrying out transesterification needs catalyst to come accelerated reaction speed and raising reaction yield (percent yield) usually, the catalyst that can be used for transesterification has highly basic, strong acid, biochemical enzyme etc., wherein, effect with the highly basic catalyst is better than the strong acid catalyst again, so industrially usually accelerate transesterification with the highly basic catalyst; Moreover the short chain alcohol that can be used for transesterification comprises methyl alcohol, ethanol, propyl alcohol, butanols and amylalcohol, and wherein methyl alcohol and ethanol are the most normal reactant that is used, especially methyl alcohol.Methanol prices is cheap, the also advantage on the belongings physical chemistry characteristic, its polarity is the strongest, chain length is also the shortest, can be fast and triglyceride react, and industrial alkali catalyst commonly used can be dissolved in the methyl alcohol.
Among transesterification, different according to method, comprise again highly basic catalysis method, strong acid catalysis method, enzyme catalysis method, supercritical fluid method, ionic liquid method, supersonic method, reach homogeneous method etc.Wherein, take highly basic catalysis method and strong acid catalysis method as common method.
The highly basic catalysis method, the mechanism of its transesterification is nucleophilic substitution reaction, C among the triglyceride C=O is positively charged slightly, can attract RO-ion generation nucleophilic substitution reaction, again because three-dimensional arrangement limits, and short chain alcohol is desirable RO-ion source, so the methyl alcohol reaction is effective, along with the increase of methyl alcohol chain length, speed of reaction can will and then reduce.The mechanism of highly basic catalysis transesterification can be divided into four steps: first step is highly basic catalyst and alcohol reaction, produces the positively charged ion in RO-ion and the alkali catalyst; Second step is that RO-attacks ionic group and attacks triglyceride and carry out nucleophilic substitution reaction, produces one and is shaped as tetrahedral intermediate; Third step is reaction intermediate and short chain alcohol reaction, regenerates the RO-ion.The 4th step is the intermediate after rearranging, and splits into alkyl ester and Diglyceride.The active substance that regenerates in the third step (RO-ion) can catalysis transesterification, so constantly circulation.
Common highly basic catalyst comprises the alkoxide of sodium hydroxide, potassium hydroxide, various carbonate and sodium and potassium, wherein the activity of metal alkoxide is the highest, right this kind highly basic catalyst almost completely can not allow the existence of water, if there is moisture to produce easily saponification reaction, and saponification reaction can consume the alkali catalyst, affects catalyst efficiency; The soap that saponification reaction produces can make product form colloidal solution, the product viscosity increases, and then reduces the reaction yield of strand ester; Moreover saponification reaction also can relatedly affect separating of glycerine and strand ester, makes the follow-up water-washing step that is difficult for carrying out; In addition, the content of free fatty acids can not be too high, because of free fatty acids also can with highly basic generation saponification reaction.
The strong acid catalysis method, to use sour catalyst catalysis transesterification, during with sour catalyst catalysis vegetable and animals oils transesterification, the acid catalyst can make C=O key summary positively charged in the triglyceride, attract short chain alcohol to carry out nucleophilic substitution reaction, produce a tetrahedral reaction intermediate, then take off Diglyceride and hydrogen ion, produce at last the fatty acid methyl ester of strand.The sour catalyst transesterification mechanism of Diglyceride and monoglyceride is the same.Easy and the reactant generation hydroxy acid of the water capacity in the stock oil, the reaction yield of reduction fatty acid ester is so when using sour catalyst, the water content in the stock oil should have its restriction.The reaction mechanism of the transesterification of strong acid catalysis monoglyceride is as follows:
The employed strong acid of transesterification is bronsted acid (Bronsted acid), such as hydrochloric acid (HCl), boron trifluoride (BF3), phosphoric acid (H3PO4), sulfuric acid (H2SO4) and sulfonic acid etc., wherein sulfonic acid and sulfuric acid are the strong acid catalysts of normal use.Use strong acid catalysis transesterification that very high reaction yield is arranged, but reaction is very slow, usually need 3 to 48 hours reaction times, and temperature of reaction is higher than 100° centigrade.B.Freeman etc. (J Am Oil Chem.Soc., 63,1375,1986) point out, if want to reach high conversion, when to use mole per-cent be 1 sulfuric acid, soybean oil with the methyl alcohol mole than being 30 to 1, during the parameter of 65 ℃ of temperature of reaction, costing 50 hours; If the use butanols is constant at reaction conditions, and only temperature of reaction is changed in 117 ℃ the situation, cost 3 hours; If use ethanol is constant at reaction conditions, and only temperature of reaction is changed in 78 ℃ the situation, cost 18 hours.
In addition, in general, sulfuric acid phase is between 1 to 5 for Weight ratio of oil.(the Trans ASAE such as M.Canakci, 45,1203-1210,1999) with animal grease and methyl alcohol reaction, operating weight per-cent is that 1,3,5 sulfuric acid is done catalyst respectively, and result of study points out that the transformation efficiency of fatty acid methyl ester is promoted to 95.0% by 72.7% when sulfuric acid consumption during from weight percent 1 to 5, show that the catalyst consumption is more within the specific limits, transformation efficiency is higher.However, the higher then representative products of catalyst consumption subsequent processing steps is more numerous and diverse, when using calcium oxide (CaO) to come neutralized reaction product acid, the catalyst consumption is more, and the consumption of calcium oxide will increase, and the acid waste liquid that must wash also will become many, therefore, cause cost to increase and environmental issue.
Among aforesaid method, no matter be highly basic catalysis method or the strong acid catalysis method excessively slow problem of time that all responds, therefore, relevant dealer and research institution all are devoted to shorten the preparation time of biodiesel, to promote production capacity and to reduce time cost.
Summary of the invention
Main purpose of the present invention is to solve the method for preparing biodiesel with vegetables oil, the problem that preparation time is long of having now.
For reaching above-mentioned purpose, the invention provides and a kind ofly prepare the method for biodiesel with vegetables oil, the method may further comprise the steps:
One prepares step, obtains an oil-phase solution that is obtained through a pre-esterification reactor by a vegetables oil;
One transesterification step, be heated to a temperature between 60 ℃ to 85 ℃ with this oil-phase solution of microwave heating decree, and a homogeneous phase alkali catalyst and one first alcohol added among this oil-phase solution and obtain a transesterification solution, relative this oil-phase solution of this homogeneous phase alkali catalyst has the weight percent between 0.8 to 1.5, and the mole that relative this oil-phase solution of this first alcohol has between 5 to 12 is counted ratio; And
One first separating step, after cooling, this transesterification solution separating goes out matter diesel oil in all one's life certainly.
As known from the above, the present invention's method of preparing biodiesel with vegetables oil is compared to the accessible beneficial functional of existing skill:
One, the present invention adopts this microwave heating method that this oil-phase solution is heated, because microwave heating is rapidly and evenly, needn't heat transfer process, so, can significantly shorten the time that this transesterification step is carried out, promote by this production capacity in the unit time;
Two, secondly, microwave heating can be led to overpowering adjustment, controls fast gradient of temperature, can effectively avoid overheated situation to occur, and reduces the chance of destroying the organic compound bond, in other words, and for reaching the effect that promotes this biodiesel yield;
Three moreover, because microwave heating is to be controlled in the heated chamber of metal material and the waveguide to operate, this can do effective control to microwave from leakage, and microwave can discharge of noxious gases, does not produce waste heat yet or causes dust pollution, therefore, in manufacturing processed, very low to the harm of environment;
Four, in addition, owing to be subjected to the material of microwave heating need not pass through other intermediate conversion links, directly microwave energy absorbing and then heating, so except a small amount of transmission loss, microwave energy does not almost have other loss, compared to the method for general conventional heating, efficient more improves.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 prepares the schema of method one embodiment of biodiesel with vegetables oil for the present invention.
Embodiment
Relevant the present invention prepares detailed description and the technology contents of the method for biodiesel with vegetables oil, now just cooperate description of drawings as follows:
See also Fig. 1, for the present invention prepares the schema of method one embodiment of biodiesel with vegetables oil, at first, carry out one and prepare step, obtain an oil-phase solution that is obtained through a pre-esterification reactor by a vegetables oil.In the present embodiment, this preparation step comprises pre-esterif iotacation step and one second separating step, be respectively step S1 and step S2, step S1 is heated to this vegetables oil first one temperature between 50 ℃ to 80 ℃, to be heated to this temperature, among a sulfuric acid and one second this vegetables oil of alcohol adding, obtain a pre-esterification solution to carry out this pre-esterification reactor, this sulfuric acid phase has weight percent between 0.5 to 2.0 to this vegetables oil, and this second alcohol relatively this vegetables oil has weight percent between 10.0 to 20.0.This vegetables oil, this sulfuric acid and this second alcohol carry out the reaction times of this pre-esterification reactor between 2 hours to 4 hours.
In the present invention, this vegetables oil can be barbadosnut seed oil, soybean oil, Oleum Cocois, plam oil or peanut oil, and preferably for using a microwave heater that this vegetables oil is heated, right the present invention is not limited to this, according to actual process design, also can adopt the equipment of other and this microwave heater equivalence that this vegetables oil is heated.In addition, among the present invention, this second alcohol can be methyl alcohol, ethanol or propyl alcohol, and in present embodiment, this second alcohol preferably is methyl alcohol.
After finishing this pre-esterification reactor, carry out step S2, after this pre-esterification solution cooling, this pre-esterification solution separating goes out this oil-phase solution certainly.In the present embodiment, this second separating step is centrifugal for first this pre-esterification solution being carried out, and takes out one second oil reservoir, then, in a temperature between 60 ℃ to 70 ℃, use a distilled water to clean this second oil reservoir, until this second oil reservoir is neutral, afterwards, again this second oil reservoir is carried out centrifugally, take out this oil-phase solution, last, this oil-phase solution is toasted, toast in a temperature between 70 ℃ to 90 ℃ and carried out about 12 hours.Wherein, this oil-phase solution has an acid value that is lower than 1mgKOH/g.
After obtaining this oil-phase solution, carry out step S3, it is a transesterification step, use a microwave heating method that this oil-phase solution is heated to a temperature between 60 ℃ to 85 ℃, and with carrying out a transesterification among a homogeneous phase alkali catalyst and one first this oil-phase solution of alcohol adding, obtain a transesterification solution, wherein, relative this oil-phase solution of this homogeneous phase alkali catalyst has the weight percent between 0.8 to 1.5, and the mole that relative this oil-phase solution of this first alcohol has between 5 to 12 is counted ratio.This homogeneous phase alkali catalyst, this first alcohol and this oil-phase solution carry out the reaction times of this transesterification between 4 seconds to 30 minutes, in the present invention, the reaction times of this transesterification is preferably between 5 seconds to 5 minutes, and the best is between 5 seconds to 120 seconds.
With this pre-esterif iotacation step, this transesterification step is preferably for using a microwave heater that this oil-phase solution is heated.In addition, in the present invention, this homogeneous phase alkali catalyst can be the oxyhydroxide of an alkali metal group or the oxyhydroxide of an alkaline earths, in present embodiment, this homogeneous phase alkali catalyst preferably is potassium hydroxide, sodium hydroxide or magnesium hydroxide, and this first alcohol can be methyl alcohol, ethanol or propyl alcohol, in present embodiment, this first alcohol preferably is methyl alcohol.
After finishing this transesterification step, namely carrying out step S4, is one first separating step, and after this transesterification solution cooling, this transesterification solution separating goes out matter diesel oil in all one's life certainly.In the present embodiment, this first separating step is centrifugal for first this transesterification solution being carried out, and takes out one first oil reservoir, then, in a temperature between 60 ℃ to 70 ℃, use a distilled water to clean this first oil reservoir, until this first oil reservoir is neutral, afterwards, again this first oil reservoir is carried out centrifugally, take out this biodiesel, last, this oil-phase solution is toasted, toast in a temperature between 70 ℃ to 90 ℃ and carried out about 12 hours.About this preparation step, as illustrating, right the present invention does not limit with abovementioned steps and obtains this oil-phase solution present embodiment, according to actual process, can adopt other equivalent methods yet with this pre-esterif iotacation step and this second separating step.
Wherein, alleged this microwave heating method of the present invention is frequency of utilization between the hertzian wave between the 300MHz-300GHz (be wavelength 1 meter (not containing 1 meter) hertzian wave between to 1 millimeter), and it has fluctuation and corpuscular property.The energy of microwave quantum is 1.99 * 10
-25～1.99 * 10
-22J.Wherein, microwave has penetrable material, by material reflection with by material absorbing three specific characters, and concerning the materials such as glass, plastic cement and porcelain, microwave almost can pass through fully and not be absorbed; The meetings such as water and food absorbing microwave and make self-heating; As for metal species, then can microwave reflection.In addition, microwave belongs to non-free radiation (non-ionizing radiation), be the hertzian wave of energy less than 10 electron-volts (eV), the energy of this degree is not sufficient to make atom to produce ion or free radical, therefore, injury to the organic compound bond is very low, can improve the stability of technique.
Prepare the method for biodiesel for further specifying the present invention with vegetables oil, see also the following experimental example that carries out according to the present invention, this only provides for the purpose that exemplifies explanation, and is not intended to limit the scope of the invention.In following experimental example, the crazy seeds of trees oil of Shi Yong Ma is as illustrating, and the preparation flow of each experimental example is:
A. first the crazy seeds of trees oil of 700g De Ma is positioned over a capacity and is in 1 liter the double-neck flask;
B. follow, use this microwave heater to this double-neck flask heating, to be heated after 70 ℃, add sulfuric acid and methyl alcohol, the reaction times is 2 hours;
C. after obtaining this pre-esterification solution, this pre-esterification solution is carried out centrifugal and takes out this second oil reservoir;
D. after, use temperature this distilled water between 60 ℃ to 70 ℃ cleans this second oil reservoir to neutral;
E. after cleaning, again this second oil reservoir is carried out centrifugally, take out this oil-phase solution;
F. this oil-phase solution is carried out about 12 hours baking in the temperature between 70 ℃ to 90 ℃;
G. it is 250 milliliters double-neck flask that this oil-phase solution of getting 60g places a capacity;
H. then, use this microwave heater to this double-neck flask heating, to be heated after 70 ℃, add this homogeneous phase alkali catalyst and methyl alcohol;
I. after obtaining this transesterification solution, this transesterification solution is carried out centrifugal and takes out this first oil reservoir;
J. follow, use temperature this distilled water between 60 ℃ to 70 ℃ cleans this first oil reservoir to neutral;
K. again this first oil reservoir is carried out centrifugally, take out this biodiesel;
L. make this biodiesel carry out about 12 hours baking in the temperature between 70 ℃ to 90 ℃.
For understanding through behind this transesterification, the transformation efficiency of this biodiesel below further carries out the measurement of the proportion of this biodiesel for each experimental example.Being determined as of proportion: will pour in 50 milliliters the graduated cylinder through oven dry and cooled this biodiesel, put into specific gravity hydrometer, after specific gravity hydrometer is stable, read scale and triplicate, get the average of its record value, be the specific gravity value of this biodiesel, the specific gravity value of pre-esterification oil product of barbadosnut seed oil biodiesel product and fs is 0.912g/cm
3, the biodiesel of subordinate phase transesterification, proportion are 0.872g/cm
3Proportion is more near 0.872g/cm
3, its transformation efficiency is more approaching to react completely.
The parameter of the experimental example that the present invention carries out is as shown in the table:
Table 1 in the experimental example 1 to 12, turns the parameter of esterification reaction use and the proportion of reaction metaplasm diesel oil
Table 2 in the experimental example 13 to 24, turns the parameter of esterification reaction use and the proportion of reaction metaplasm diesel oil
As known from the above, the experimental example 1 to 24 that carries out according to the present invention, after this pre-esterification reactor of process and this turn esterification reaction, resulting this biodiesel, its proportion is all near 0.872g/cm
3, namely represent this biodiesel and have high conversion and high selectivity.Especially with resulting this biodiesel of parameter of experimental example 3 to 12 and experimental example 17 to 24, the most near 0.872g/cm
3, its character is best; Simultaneously and since the present invention carry out this turn esterified step, be to adopt this microwave heating method, so can effectively shorten the process time, according to upper table result, this turns esterified step all can finish in 30 minutes, and possessed certain transformation efficiency and selection rate.The suitable processing parameter if arrange in pairs or groups, the fastest can to obtain proportion about 20 seconds be 0.872g/cm
3This biodiesel, namely experimental example 20.
For further verifying effect of the present invention, point out (Harumi Veny etc. according to document, Int.J.Thermophys (2009) 30:529-541), under 25 ℃, barbadosnut seed oil methyl esters biodiesel after barbadosnut seed oil and the transesterification, its proportion are respectively 0.91042 and 0.87304g/cm
3, this and result of the present invention meet, and please join following table:
In sum, the present invention mainly adopts and uses this microwave heating method, have by it heat up rapidly, the advantage such as homogeneous heating, the time that effectively shortens this transesterification step is in 4 seconds to 30 minute, and obtains the biodiesel that this has high conversion and high selectivity; Again, but because gradient of temperature is controlled in the adjustment of microwave heating mat power fast, like this, can avoid overheated generation, and then improve the yield of this biodiesel; In addition, operate because microwave heating is controlled in the heated chamber of metal material and the waveguide, microwave is difficult for revealing, and microwave itself can't discharge of noxious gases, also can not produce waste heat or form dust pollution, so very low to the harm of environment; At last, owing to be subjected to the material of microwave heating need not pass through other intermediate conversion links, directly microwave energy absorbing and then heating, so except a small amount of transmission loss, microwave energy does not almost have other loss, compared to the method for general conventional heating, efficient more improves.
Certainly; the present invention also can have other various embodiments; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (13)
1. one kind prepares the method for biodiesel with vegetables oil, it is characterized in that the method may further comprise the steps:
One prepares step, obtains an oil-phase solution that is obtained through a pre-esterification reactor by a vegetables oil;
One transesterification step, be heated to a temperature between 60 ℃ to 85 ℃ with this oil-phase solution of microwave heating decree, and a homogeneous phase alkali catalyst and one first alcohol added among this oil-phase solution and obtain a transesterification solution, relative this oil-phase solution of this homogeneous phase alkali catalyst has the weight percent between 0.8 to 1.5, and the mole that relative this oil-phase solution of this first alcohol has between 5 to 12 is counted ratio; And
One first separating step, after cooling, this transesterification solution separating goes out matter diesel oil in all one's life certainly.
2. describedly according to claim 1 prepare the method for biodiesel with vegetables oil, it is characterized in that this vegetables oil is to select the group that free barbadosnut seed oil, soybean oil, Oleum Cocois, plam oil and peanut oil form.
3. describedly according to claim 1 prepare the method for biodiesel with vegetables oil, it is characterized in that, this oil-phase solution has an acid value that is lower than 1mg KOH/g.
4. describedly according to claim 1 prepare the method for biodiesel with vegetables oil, it is characterized in that this first separating step may further comprise the steps:
This transesterification solution centrifugal is taken out one first oil reservoir;
In a temperature between 60 ℃ to 70 ℃, use a distilled water to clean this first oil reservoir to neutral;
Centrifugal and take out this biodiesel to this first oil reservoir; And
In a temperature between 60 ℃ to 70 ℃ this biodiesel is toasted.
5. describedly according to claim 1 prepare the method for biodiesel with vegetables oil, it is characterized in that this preparation step comprises:
One pre-esterif iotacation step, make this vegetables oil be heated to a temperature between 50 ℃ to 80 ℃, and a sulfuric acid and one second alcohol added among this vegetables oil and obtain a pre-esterification solution, this sulfuric acid phase has weight percent between 0.5 to 2.0 to this vegetables oil, and this second alcohol relatively this vegetables oil has weight percent between 10.0 to 20.0; And
One second separating step, after cooling, this pre-esterification solution separating goes out this oil-phase solution certainly.
6. describedly according to claim 5 prepare the method for biodiesel with vegetables oil, it is characterized in that this second separating step may further comprise the steps:
This pre-esterification solution centrifugal is taken out one second oil reservoir;
In a temperature between 60 ℃ to 70 ℃, use a distilled water to clean this second oil reservoir to neutral;
Centrifugal and take out this oil-phase solution to this second oil reservoir; And
In a temperature between 70 ℃ to 90 ℃ this oil-phase solution is toasted.
7. describedly according to claim 5 prepare the method for biodiesel with vegetables oil, it is characterized in that this second alcohol is for selecting the group that free methyl alcohol, ethanol and propyl alcohol form.
8. describedly according to claim 5 prepare the method for biodiesel with vegetables oil, it is characterized in that, among this pre-esterif iotacation step, for using a microwave reactor this vegetables oil is heated.
9. describedly according to claim 1 prepare the method for biodiesel with vegetables oil, it is characterized in that, this transesterification step was carried out in reaction times between 4 seconds to 30 minutes.
10. describedly according to claim 1 prepare the method for biodiesel with vegetables oil, it is characterized in that this homogeneous phase alkali catalyst is the oxyhydroxide of an alkali metal group or the oxyhydroxide of an alkaline earths.
11. describedly according to claim 1 prepare the method for biodiesel with vegetables oil, it is characterized in that this homogeneous phase alkali catalyst is to select the group that free potassium hydroxide, sodium hydroxide and magnesium hydroxide form.
12. describedly according to claim 1 prepare the method for biodiesel with vegetables oil, it is characterized in that this first alcohol is for selecting the group that free methyl alcohol, ethanol and propyl alcohol form.
13. describedly according to claim 1 prepare the method for biodiesel with vegetables oil, it is characterized in that this microwave heating method is for using a microwave reactor that this oil-phase solution is heated.
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| CN101074390A (en) * | 2007-07-19 | 2007-11-21 | 杨庆利 | Production of biological diesel oil by high-acid value grease |
| CN101307246A (en) * | 2008-06-26 | 2008-11-19 | 济南大学 | Process for co-preparing biodiesel by ultrasonic and microwave |
| CN102311883A (en) * | 2011-08-10 | 2012-01-11 | 北京清研利华石油化学技术有限公司 | Method for preparing high-purity biodiesel |
| CN102703135A (en) * | 2012-05-03 | 2012-10-03 | 北京国力源高分子科技研发中心 | Method for producing biodiesel |
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