CN104419456A - Refining method and refining apparatus of high-quality biodiesel - Google Patents
Refining method and refining apparatus of high-quality biodiesel Download PDFInfo
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- CN104419456A CN104419456A CN201310375362.4A CN201310375362A CN104419456A CN 104419456 A CN104419456 A CN 104419456A CN 201310375362 A CN201310375362 A CN 201310375362A CN 104419456 A CN104419456 A CN 104419456A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G53/00—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes
- C10G53/02—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only
- C10G53/12—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only including at least one alkaline treatment step
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/20—Characteristics of the feedstock or the products
- C10G2300/201—Impurities
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/20—Characteristics of the feedstock or the products
- C10G2300/201—Impurities
- C10G2300/205—Metal content
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/40—Characteristics of the process deviating from typical ways of processing
- C10G2300/4006—Temperature
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/40—Characteristics of the process deviating from typical ways of processing
- C10G2300/4012—Pressure
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/80—Additives
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Fats And Perfumes (AREA)
Abstract
The invention relates to a refining method of high-quality biodiesel, which comprises the following steps: adding alkaline liquor into inferior-quality biodiesel to obtain low-acid value biodiesel with an acid value of less than 0.5 mg KOH/g, centrifuging the low-acid value biodiesel with an acid value of less than 0.5 mg KOH/g to remove soap generated by neutralization, and glycerin and alkaline liquor generated in extraction, so as to obtain pure low-acid value biodiesel, washing the pure low-acid value biodiesel in soft water, stirring, centrifuging to separate water and impurities such as water-soluble metal ions, so as to obtain low-acid value low-metal biodiesel with a high water content, heating the low-acid value low-metal biodiesel with a high water content in vacuum equipment, and then performing vacuum dehydration to obtain the high-quality biodiesel. The refining method of the invention is simple in process, high in production efficiency, and convenient for large scale production, and the produced biodiesel conforms to the national standard of biodiesel after detection.
Description
Technical field
The present invention relates to a kind of process for purification of high quality biologic diesel oil, belong to new forms of energy purifying products technical field.
Background technology
Current domestic production biofuel adopts two kinds of raw materials mostly: a kind of tankage utilizing sewer oil, waste animal and vegetable oil, refined vegetable oil, this degree spoiled by rancid oil or fat is higher therefore acid value is higher, another kind utilizes quality better, the animal-plant oil of acid value within 3mgKOH/g.
The first raw material is higher due to acid value, mostly adopts soda acid two-step approach production technique, and the thick methyl esters obtained after reaction is because color is comparatively dark, smell is heavier, impurity is more, cannot meet the standard of national biofuel, usually all needs distillation process to purify.The general acid number of the biofuel obtained after purification, at about 1mgKOH/g, has a small amount of glycerine, and the content of fatty acid methyl ester is generally upper and lower at 94--95%, and the standard acid number being also difficult to reach national biofuel is less than the requirement of 0.5 mgKOH/g.
The second raw material is lower due to acid value, mostly adopts single stage method, makees catalyzer carry out transesterification reaction with alkali, to be separated to obtain biofuel by glycerine with soap.The general smell of this biofuel is comparatively large, and color is comparatively dark, and glycerol content is higher and have certain soap to exist, so glycerine exceeds standard, the content of fatty acid methyl ester only has 92-93%, and quality does not reach the standard of national biofuel yet.
Summary of the invention
For the present situation that domestic biofuel enterprise produces, for guaranteeing that biodiesel oil product is up to state standards, must be separated to the biofuel of distillation gained or single stage method the inferior quality biofuel obtained and refining, make product promote quality and be up to state standards.
In order to achieve the above object, the present invention is achieved by the following technical solutions:
The present invention is a kind of process for purification of high quality biologic diesel oil: the method comprises the following steps:
(1) low acid number biofuel is produced: in inferior quality biofuel, add alkali lye, obtain the low acid number biofuel of acid number at below 0.5mgKOH/g, after adding alkali lye, fatty acid neutralization reaction in inferior quality biofuel generates soap, and the water in alkali lye extracts the glycerine be dissolved in inferior quality biofuel;
(2) produce purer low acid number biofuel: by above-mentioned acid number the low acid number biofuel of below 0.5mgKOH/g removed by centrifugation above-mentioned in and generate soap, glycerine in above-mentioned extraction and alkali lye, obtain purer low acid number biofuel;
(3) biofuel of the higher low metal of low acid number of water ratio is produced: soft water washing will be added in above-mentioned purer low acid number biofuel, by the impurity such as centrifugation water outlet and water-soluble metal ion after stirring, obtain the biofuel of the higher low metal of low acid number of water ratio;
(4) high-quality biofuel is produced: the final vacuum that the biofuel of the low metal of low acid number higher for above-mentioned water ratio heated up in vacuum apparatus dewaters, and obtains high-quality biofuel.
In the present invention, alkali lye is the mixed solution of sodium hydroxide solution or potassium hydroxide solution or sodium hydroxide and potassium hydroxide.
Preferred version of the present invention is: in step (2) with step (3), centrifugation adopts disk centrifuge or channel separator to be separated, separation factor >=8000.
Preferred version of the present invention is: in above-mentioned steps (4), vacuum hydro-extraction temperature is 70 to 90 DEG C, and pressure is-0.085MPa to-0.1MPa.
Preferred version of the present invention is: described concentration of sodium hydroxide solution≤30%, described potassium hydroxide solution concentration≤20%.
The refining plant of a kind of high quality biologic diesel oil of the present invention, during this device comprises and still, inferior quality biofuel and alkali lye in and stir in still, reaction, in and still be connected with the first whizzer, in and still reaction soln entered centrifugally in the first whizzer obtain purer low acid number biofuel by pump, first whizzer is connected with washing kettle by pump, the purer low acid number biofuel obtained by the first centrifuge is pumped in washing kettle, add soft water at washing kettle to stir, then the biofuel flowing out the higher low metal of low acid number of water ratio after soluble metal ion removed by the second whizzer is pumped into, second whizzer is connected with preheater, preheater is connected with evaporating kettle by pipeline, evaporating kettle is by being connected with vacuum pump after gas condenser, discharge after the moisture condensation of the biofuel of the low metal of low acid number higher for water ratio, non-condensable gas is extracted out by vacuum pump, moisture can evaporate away by the biofuel through the higher low metal of low acid number of the water ratio of evaporating kettle, qualified high-quality biological diesel oil is extracted out by pump, obtain the biofuel of high-quality.
Further improvement of the present invention is: on evaporating kettle, be provided with the visor that two are observed evaporating kettle inner case.
Further improvement of the present invention is: evaporating kettle temperature is 70 to 90 DEG C, and pressure is-0.085MPa to-0.1Mpa.
The invention has the beneficial effects as follows: the present invention removes the materials such as soap, glycerine and alkali lye by centrifugation, and eliminate the metal ion of solubility, and finally by vacuum hydro-extraction, obtain the biofuel of high-quality, the present invention produces that high-quality biological diesel colour is shallow, smell is light, impurity is few, acid number of biodiesel after purification, at below 0.5mgKOH/g, meets the standard acid number of national biofuel.
Present invention process is simple, and without the need to manual operation, can realize the biofuel of automatically refining high-quality, the time is short, and production efficiency is high, is convenient to large-scale production, and the biofuel of producing all meets the standard of country to biofuel through detecting.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Fig. 2 is structural representation of the present invention.
Wherein: in 1-and still, 2-first whizzer, 3-washing kettle, 4-second whizzer, 5-preheater, 6-evaporating kettle, 7-gas condenser, 8-vacuum pump, 9-visor.
Embodiment
In order to deepen the understanding of the present invention, be described in further detail the present invention below in conjunction with drawings and Examples, this embodiment, only for explaining the present invention, not forming protection scope of the present invention and limiting.
As shown in Figure 1-2, the present invention is a kind of process for purification of high quality biologic diesel oil: the method comprises the following steps:
(1) low acid number biofuel is produced: in inferior quality biofuel, add alkali lye, obtain the low acid number biofuel of acid number at below 0.5mgKOH/g, after adding alkali lye, fatty acid neutralization reaction in inferior quality biofuel generates soap, water in alkali lye extracts the glycerine be dissolved in inferior quality biofuel, described alkali lye is the mixed solution of sodium hydroxide solution or potassium hydroxide solution or sodium hydroxide and potassium hydroxide, described concentration of sodium hydroxide solution≤30%, described potassium hydroxide solution concentration≤20%;
(2) produce purer low acid number biofuel: by above-mentioned acid number the low acid number biofuel of below 0.5mgKOH/g removed by centrifugation above-mentioned in and generate soap, glycerine in above-mentioned extraction and alkali lye, obtain purer low acid number biofuel, centrifugation adopts disk centrifuge or channel separator to be separated, separation factor >=8000;
(3) biofuel of the higher low metal of low acid number of water ratio is produced: soft water washing will be added in above-mentioned purer low acid number biofuel, by the impurity such as centrifugation water outlet and water-soluble metal ion after stirring, obtain the biofuel of the higher low metal of low acid number of water ratio, centrifugation adopts disk centrifuge or channel separator to be separated, separation factor >=8000;
(4) high-quality biofuel is produced: the final vacuum that the biofuel of the low metal of low acid number higher for above-mentioned water ratio heated up in vacuum apparatus dewaters, obtain high-quality biofuel, vacuum hydro-extraction temperature is 70 to 90 DEG C, and pressure is-0.085MPa to-0.1MPa.
Low-quality biofuel is added certain alkaline reaction, acid number is made to reach below 0.5mgKOH/g, go out glycerine through centrifugation, soap gives up and alkali lye, obtain purer low acid number biofuel, this biofuel through soft water washing and centrifugation, removes residual soap, glycerine and metal ion again; Finally by the vacuum hydro-extraction of 70-90 DEG C, after removing micro-moisture, obtain high-quality biofuel.
With still 1 during device described in a kind of refining plant of high quality biologic diesel oil comprises, described inferior quality biofuel and alkali lye are in described and stir in still 1, reaction, the first whizzer 2 is connected with still 1 in described, in described and still 1 reaction soln entered centrifugally in the first whizzer 2 obtain purer low acid number biofuel by pump, described first whizzer 2 is connected with washing kettle 3 by pump, to pump in described washing kettle 3 by the centrifugal purer low acid number biofuel obtained of the first whizzer 2, add soft water at described washing kettle 3 to stir, then the biofuel flowing out the higher low metal of low acid number of water ratio after soluble metal ion removed by the second whizzer 4 is pumped into, described second whizzer 4 is connected with preheater 5, described preheater 5 is connected with evaporating kettle 6 by pipeline, evaporating kettle 6 temperature is 70 to 90 DEG C, pressure is-0.085MPa to-0.1Mpa, described evaporating kettle 6 is provided with the visor 9 that two are observed evaporating kettle 6 inner case, described evaporating kettle 6 is by being connected with vacuum pump 8 after gas condenser 7, discharge after the moisture condensation of the biofuel of the low metal of low acid number higher for water ratio, non-condensable gas is extracted out by described vacuum pump 8, moisture can evaporate away by the biofuel through the higher low metal of low acid number of the water ratio of evaporating kettle 6, qualified high-quality biological diesel oil is extracted out by pump, obtain the biofuel of high-quality, moisture can evaporate away by the biofuel through the higher low metal of low acid number of the water ratio of evaporating kettle 6, qualified high-quality biological diesel oil is extracted out by pump.
Embodiment one
By after adding sodium hydroxide in 5000kg inferior quality biofuel in and carry out stirring one minute in still, sodium hydroxide and 100 kg of water of 1 kilogram are dissolved, then the biofuel after stirring is pumped in butterfly whizzer, by soap, the glycerine of extraction, alkali lye that centrifugal centrifugation generates except lixiviating and fatty acid, flow out low acid number biofuel; Low acid number biofuel is pumped into washing kettle, then in washing kettle, adds 3-5% soft water stir 20 seconds, pump into butterfly whizzer, be separated water outlet and water miscible metal ion by the effect of whizzer, flow out the biofuel of the higher low metal of low acid number of water ratio; The biofuel of the low metal of low acid number higher for this water ratio is pumped in evaporating kettle, open vacuum pump and jacket steam, control still internal pressure at-0.09MPa, temperature in the kettle 80 DEG C, discharging after 0.5 hour, obtains high-quality biofuel, described evaporating kettle is also connected with vacuum pump by gas condenser, steam vacuumizes after condenser, and discharged by water of condensation after moisture condensation, non-condensable gas is extracted out by vacuum pump.Content is as follows after testing for the described biofuel made:
| Project | Quality index | Detected result |
| Density (20 DEG C)/(kg/m 3） | 820--900 | 876 |
| Kinematic viscosity (40 DEG C)/(mm 2/s) | 1.9—6.0 | 3.5 |
| Flash-point (remaining silent)/DEG C | ≥130 | 169 |
| Condensation point/DEG C | Report | 2 |
| Sulphur content (massfraction)/% | ≤0.05 | 0.01 |
| 10o steams excess carbon residue (massfraction)/% | ≤0.3 | 0.05 |
| Sulfated ash (massfraction)/% | ≤0.020 | 0.001 |
| Water-content (massfraction)/% | ≤0.05 | 0.01 |
| Mechanical impurity | Nothing | Nothing |
| Oxidation stability (110 DEG C)/h | ≥6 | 7 |
| Acid number (mgKOH/g) | ≤0.5 | 0.27 |
| Free glycerol content (massfraction)/% | ≤0.020 | Do not detect |
| Total glycerol content (massfraction)/% | ≤0.240 | Do not detect |
The present invention removes the materials such as soap, glycerine and alkali lye by centrifugation, and eliminate the metal ion of solubility, and finally by vacuum hydro-extraction, obtain the biofuel of high-quality, the present invention produces that high-quality biological diesel colour is shallow, smell is light, impurity is few, acid number of biodiesel after purification, at below 0.5mgKOH/g, meets the standard acid number of national biofuel.
Present invention process is simple, and without the need to manual operation, can realize the biofuel of automatically refining high-quality, the time is short, and production efficiency is high, is convenient to large-scale production, and the biofuel of producing all meets the standard of country to biofuel through detecting.
Claims (8)
1. the process for purification of a high quality biologic diesel oil: it is characterized in that: the method comprises the following steps:
(1) low acid number biofuel is produced: in inferior quality biofuel, add alkali lye, obtain the low acid number biofuel of acid number at below 0.5mgKOH/g, after adding alkali lye, fatty acid neutralization reaction in inferior quality biofuel generates soap, and the water in alkali lye extracts the glycerine be dissolved in inferior quality biofuel;
(2) produce purer low acid number biofuel: by above-mentioned acid number the low acid number biofuel of below 0.5mgKOH/g removed by centrifugation above-mentioned in and generate soap, glycerine in above-mentioned extraction and alkali lye, obtain purer low acid number biofuel;
(3) biofuel of the higher low metal of low acid number of water ratio is produced: soft water washing will be added in above-mentioned purer low acid number biofuel, by the impurity such as centrifugation water outlet and water-soluble metal ion after stirring, obtain the biofuel of the higher low metal of low acid number of water ratio;
(4) high-quality biofuel is produced: the final vacuum that the biofuel of the low metal of low acid number higher for above-mentioned water ratio heated up in vacuum apparatus dewaters, and obtains high-quality biofuel.
2. the process for purification of a kind of high quality biologic diesel oil according to claim 1, is characterized in that: described alkali lye is the mixed solution of sodium hydroxide solution or potassium hydroxide solution or sodium hydroxide and potassium hydroxide.
3. the process for purification of a kind of high quality biologic diesel oil according to claim 1, is characterized in that: in step (2) and step (3), centrifugation adopts disk centrifuge or channel separator to be separated, separation factor >=8000.
4. the process for purification of a kind of high quality biologic diesel oil according to claim 1, is characterized in that: in above-mentioned steps (4), vacuum hydro-extraction temperature is 70 to 90 DEG C, and pressure is-0.085MPa to-0.1MPa.
5. the process for purification of a kind of high quality biologic diesel oil according to claim 2, is characterized in that: described concentration of sodium hydroxide solution≤30%, described potassium hydroxide solution concentration≤20%.
6. the refining plant of a high quality biologic diesel oil, it is characterized in that: with still (1) during described device comprises, described inferior quality biofuel and alkali lye are in described and stir in still (1), reaction, the first whizzer (2) is connected with still (1) in described, in described and still (1) reaction soln entered centrifugally in the first whizzer (2) obtain purer low acid number biofuel by pump, described first whizzer (2) is connected with washing kettle (3) by pump, to pump in described washing kettle (3) by the centrifugal purer low acid number biofuel obtained of the first whizzer (2), add soft water at described washing kettle (3) to stir, then the biofuel flowing out the higher low metal of low acid number of water ratio after soluble metal ion removed by the second whizzer (4) is pumped into, described second whizzer (4) is connected with preheater (5), described preheater (5) is connected with evaporating kettle (6) by pipeline, described evaporating kettle (6) is by being connected with vacuum pump (8) after gas condenser (7), discharge after the moisture condensation of the biofuel of the low metal of low acid number higher for water ratio, non-condensable gas is extracted out by described vacuum pump (8), moisture can evaporate away by the biofuel through the higher low metal of low acid number of the water ratio of evaporating kettle (6), qualified high-quality biological diesel oil is extracted out by pump, obtain the biofuel of high-quality.
7. the refining plant of a kind of high quality biologic diesel oil according to claim 6, is characterized in that: on described evaporating kettle (6), be provided with the visor (9) that two are observed evaporating kettle (6) inner cases.
8. the refining plant of a kind of high quality biologic diesel oil according to claim 6, is characterized in that: evaporating kettle (6) temperature is 70 to 90 DEG C, and pressure is-0.085MPa to-0.1Mpa.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111234927A (en) * | 2020-02-12 | 2020-06-05 | 常州市金坛区维格生物科技有限公司 | Separation method of low-freezing-point biodiesel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101735845A (en) * | 2008-11-10 | 2010-06-16 | 北京化工大学 | Method for separating and purifying biodiesel |
| CN101985580A (en) * | 2010-11-15 | 2011-03-16 | 江苏永林油脂化工有限公司 | Method for preparing biodiesel from low-boiling-point substance through continuous rectification of oleic acid |
| CN102127490A (en) * | 2010-01-19 | 2011-07-20 | 江苏永林油脂化工有限公司 | Method for preparing biodiesel by vegetable oil acidic oil |
| CN102229859A (en) * | 2011-05-27 | 2011-11-02 | 江苏恒顺达生物能源有限公司 | Method for removing excessive fatty acid from biodiesel |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101735845A (en) * | 2008-11-10 | 2010-06-16 | 北京化工大学 | Method for separating and purifying biodiesel |
| CN102127490A (en) * | 2010-01-19 | 2011-07-20 | 江苏永林油脂化工有限公司 | Method for preparing biodiesel by vegetable oil acidic oil |
| CN101985580A (en) * | 2010-11-15 | 2011-03-16 | 江苏永林油脂化工有限公司 | Method for preparing biodiesel from low-boiling-point substance through continuous rectification of oleic acid |
| CN102229859A (en) * | 2011-05-27 | 2011-11-02 | 江苏恒顺达生物能源有限公司 | Method for removing excessive fatty acid from biodiesel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111234927A (en) * | 2020-02-12 | 2020-06-05 | 常州市金坛区维格生物科技有限公司 | Separation method of low-freezing-point biodiesel |
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Application publication date: 20150318 |