CN106318647A - Low-pollution production method for biodiesel - Google Patents

Low-pollution production method for biodiesel Download PDF

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Publication number
CN106318647A
CN106318647A CN201610904574.0A CN201610904574A CN106318647A CN 106318647 A CN106318647 A CN 106318647A CN 201610904574 A CN201610904574 A CN 201610904574A CN 106318647 A CN106318647 A CN 106318647A
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China
Prior art keywords
biodiesel
storage tank
methanol
production method
liquid
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CN201610904574.0A
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Chinese (zh)
Inventor
陈波
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Sichuan Lan Bang New Energy Technology Co Ltd
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Sichuan Lan Bang New Energy Technology Co Ltd
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Priority to CN201610904574.0A priority Critical patent/CN106318647A/en
Publication of CN106318647A publication Critical patent/CN106318647A/en
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    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11C—FATTY ACIDS FROM FATS, OILS OR WAXES; CANDLES; FATS, OILS OR FATTY ACIDS BY CHEMICAL MODIFICATION OF FATS, OILS, OR FATTY ACIDS OBTAINED THEREFROM
    • C11C3/00—Fats, oils, or fatty acids by chemical modification of fats, oils, or fatty acids obtained therefrom
    • C11C3/04—Fats, oils, or fatty acids by chemical modification of fats, oils, or fatty acids obtained therefrom by esterification of fats or fatty oils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/79—Injecting reactants
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
    • C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
    • C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/02—Liquid carbonaceous fuels essentially based on components consisting of carbon, hydrogen, and oxygen only
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B3/00—Refining fats or fatty oils
    • C11B3/12—Refining fats or fatty oils by distillation
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11C—FATTY ACIDS FROM FATS, OILS OR WAXES; CANDLES; FATS, OILS OR FATTY ACIDS BY CHEMICAL MODIFICATION OF FATS, OILS, OR FATTY ACIDS OBTAINED THEREFROM
    • C11C3/00—Fats, oils, or fatty acids by chemical modification of fats, oils, or fatty acids obtained therefrom
    • C11C3/04—Fats, oils, or fatty acids by chemical modification of fats, oils, or fatty acids obtained therefrom by esterification of fats or fatty oils
    • C11C3/10—Ester interchange
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/304—Alkali metal compounds of sodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/306—Alkali metal compounds of potassium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/604—Hydroxides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2270/00—Specifically adapted fuels
    • C10L2270/02—Specifically adapted fuels for internal combustion engines
    • C10L2270/026—Specifically adapted fuels for internal combustion engines for diesel engines, e.g. automobiles, stationary, marine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel

Abstract

The invention relates to the field of biodiesel and especially relates to a low-pollution production method for biodiesel. The method comprises the steps of esterifying, exchanging ester and dealcoholizing crude methyl ester. The method is characterized in that gas treatment is contained in the step of esterification reaction, and the dealcoholizing treatment and dewatering treatment are carried out for the crude methyl ester. According to the method provided by the invention, the recovery of methyl alcohol in various steps can be effectively increased, and the environmental pollution can be reduced.

Description

A kind of low stain production method of biodiesel
Technical field
The present invention relates to field of biodiesel oil, especially a kind of oligosaprobic production method of biodiesel.
Background technology
Biodiesel is the regenerative resource of cleaning, it using biomass resource as raw material based on the one that processes Diesel oil (liquid fuel), main chemical compositions is fatty acid methyl ester.Specifically, vegetable and animals oils, such as Oleum Brassicae campestris, soybean oil, flower Oil generation, Semen Maydis oil, Testa oryzae oil, Oleum Gossypii semen；And animal and vegetable oil leftover acidification oil, fatty acid；Animal oil: Adeps Sus domestica, chicken oil, duck Oil, animal bone scalp pomade etc. are through a series of chemical conversions, and refined liquid fuel, is the petroleum diesel succedaneum of high-quality.Raw Thing diesel oil is typical " green energy resource ", greatly develops biodiesel to sustainable economic development, advances energy substitution, alleviate ring Border pressure, controls urban atmospheric pollution and has great strategic importance.
Existing biodiesel mainly has base catalysis method, acid catalyzed process, lipase or biological enzyme, supercritical extraction, It is contemplated that the factor of each side, commercially produce and mostly use base catalysis method and acid catalyzed process, and in current state of China Under feelings and current oil price, food stage oils and fats is used to produce biodiesel as raw material the most unrealistic, waste cooking oil and portion Divide industrial oils and fats cost comparatively speaking relatively low.But, these waste greases usually contain higher free fatty, thus right First to be esterified with acid catalyzed process in these waste greases, then carry out ester exchange reaction by base catalyst.Base catalysis Method and acid catalyzed process are otherwise known as chemical method.
Mostly use phosphoric acid or sulphuric acid as catalyst, sulphuric acid or phosphoric acid with steam and methanol mixed in esterification process Form combination gas, enter methanol loop system, through condensation, obtain the useless methanol acid solution that pH is about 4, enter back into methanol essence Evaporating tank to be separated with waste liquid by methanol, the methanol after separation is continuing with, and waste liquid discharges after treatment.But it is big owing to waste liquid containing Measuring sulphuric acid or phosphoric acid, belong to dangerization waste water, intractability is big, consume height；During the most whole, the existence of sulphuric acid causes equipment Requiring height, each storage tank needs to use stainless steel, and pump needs, with magnetic drive pump etc., to cause engineering required investment height；Rectification gained first The aobvious acidity of alcohol, is not suitable for ester exchange reaction, and during rectification, methanol concentration is relatively low, and rectification consumes big and methanol loss is relatively big, typically For in wastewater of rectification containing 5～the methanol of 7%.
It is only weakly alkaline thick methyl ester, containing a certain amount of methanol with water wherein by obtain after ester exchange reaction.Existing The thick methyl ester having, when dealcoholation treatment, is carried out often through the method for dehydration after first dealcoholysis.Dehydration after dealcoholysis step completes In step, gas the most directly discharges, and has a strong impact on gas in environment, and dehydration and still contains a certain amount of methanol.And The gas of existing thick methyl ester dealcoholysis gained reclaims the most relatively difficult.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of oligosaprobic production method, can effectively reduce biodiesel pair The pollution of environment.
To achieve these goals, the technical solution adopted in the present invention is, the low stain producer of a kind of biodiesel Method, including esterification, ester exchange, thick methyl ester dealcoholysis step, wherein step of esterification includes gas treatment, described thick methyl ester Dealcoholysis includes that dealcoholation treatment and processed, described gas treatment comprise the following steps:
1. gas alkalization: use original alkali liquor to spray gas, make gas pH >=9；
2. condensation: the gas after alkalization enters storage tank after condensing；
3. dispensing: the liquid in storage tank enters in material-compound tank and carries out mix with alkali, obtains circulation alkali liquor；
4. circulation: the original alkali liquor in using circulation alkali liquor to replace step 1. repeats step the most 3. 1 time or repeatedly；
5. methanol rectification: through 1 time or repeatedly circulation after, in liquid in storage tank during methanol content >=65wt%, liquid in storage tank is entered Row methanol rectification, obtains methanol and waste water；
Described thick methyl ester dealcoholysis step passes through vacuum pump for being mixed with processed gained gas by dealcoholation treatment gained gas Entering condenser after extraction, condensed liquid enters and reclaims storage tank, reclaims storage tank and is provided with circulating pump, and circulating pump extraction is reclaimed Liquid in tank the most just sprays, and turns again to reclaim storage tank after condensed liquid mixing.
Further, described step 1. in alkali liquor be the one in sodium hydroxide solution or potassium hydroxide or mixing.
Further, the alkali that 3. described step plants is the one in sodium hydroxide or potassium hydroxide or mixing.
As preferably, described step 1. in alkali liquor solute and described step 3. in alkali be material of the same race, for hydroxide One in sodium or potassium hydroxide.
Further, described step 3. in circulation alkali liquor pH >=10.
As preferably, 5. described step during methanol content >=75wt%, carries out methanol essence in liquid in storage tank to liquid in storage tank Evaporate.
Further, the described storage tank that reclaims itself is its volume 15～methanol solution of 25% containing volume.
Further, described concentration of methanol solution is not higher than 15wt%.
Further, described dealcoholation treatment uses flash tank, and treatment temperature is 75～85 DEG C.
Further, described processed uses flash tank, and treatment temperature is 125～135 DEG C.
As preferably, described dealcoholation treatment temperature is 80 DEG C.
As preferably, described processed temperature is 130 DEG C.
As preferably, described circulating pump uses water ring vacuum pump.
Further, when in the liquid in described recycling can, methanol content is not less than 45wt%, methanol is recycled.
Can effectively be neutralized the mixed gas in esterification by method of the present invention, thus after effectively solving As etching problem to equipment of the acid of catalyst in continuous processing procedure, stainless steel storage tank originally is made to be replaced by ordinary carbon steel material Matter, magnetic drive pump originally is replaced by conventional pumps, the 1/5 of former cost of investment that cost of investment is not enough；The aobvious alkalescence of rectification gained methanol Can be used for follow-up ester exchange reaction to use, and methanol tank；In rectification gained waste water for sodium sulfate with less than 1wt% methanol, be Conventional waste water, process is convenient, cost for wastewater treatment is low；After using repeatedly circulation, methanol content is high, and rectification loss is little, and power consumption is more Few；It is also carried out processed gained gas reclaiming simultaneously, has reduced the waste of methanol, reduce the pollution to environment, simultaneously Can also contribute to the absorption of the methanol gas produced in dealcoholysis step, in side utilizes circulating pump extraction recycling can after the condenser The methanol solution of low concentration spray, the dissolving that can further speed up methanol is easy to reclaim.It is achieved thereby that it is biological Diesel oil low stain produces.
Detailed description of the invention
Below by specific embodiment, the present invention is described in further detail.
Embodiment 1: the low stain production method of a kind of biodiesel, including esterification, ester exchange, thick methyl ester dealcoholysis step, Wherein step of esterification includes gas treatment, and described thick methyl ester dealcoholysis includes dealcoholation treatment and processed, described Gas treatment comprises the following steps:
1. gas alkalization: use potassium hydroxide solution to spray gas, make gas pH >=9；
2. condensation: the gas after alkalization enters storage tank after condensing；
3. dispensing: the liquid in storage tank enters in material-compound tank and carries out mix with sodium hydroxide and potassium hydroxide, is circulated Alkali liquor, circulation alkali liquor pH >=10；
4. circulation: the original alkali liquor in using circulation alkali liquor to replace step 1. repeats step the most 3. 1 time；
5. methanol rectification: after 1 time circulates, in liquid in storage tank during methanol content >=65wt%, liquid in storage tank is carried out methanol Rectification, obtains methanol and waste water；
Described thick methyl ester dealcoholysis step passes through vacuum pump for being mixed with processed gained gas by dealcoholation treatment gained gas Entering condenser after extraction, condensed liquid enters and reclaims storage tank, reclaims storage tank and is provided with circulating pump, and circulating pump extraction is reclaimed Liquid in tank the most just sprays, and turns again to reclaim storage tank after condensed liquid mixing.
Described reclaims storage tank itself containing the methanol solution that volume is its volume 20%.
Described concentration of methanol solution is not higher than 15wt%.
Described dealcoholation treatment uses flash tank, and treatment temperature is 80 DEG C.
Described processed uses flash tank, and treatment temperature is 130 DEG C.
Described circulating pump uses water ring vacuum pump.
When in liquid in described recycling can, methanol content is 55wt%, methanol is recycled.
Through checking to show alkalescence through gas treatment gained methanol, being mainly composed of sodium sulfate in waste water, methanol contains Amount is 1wt%.
Embodiment 2: the low stain production method of a kind of biodiesel, including esterification, ester exchange, thick methyl ester dealcoholysis step, Wherein step of esterification includes gas treatment, and described thick methyl ester dealcoholysis includes dealcoholation treatment and processed, described Gas treatment comprises the following steps: 1. gas alkalization: gas uses the mixed liquor of potassium hydroxide solution and potassium hydroxide solution Spray, make gas pH >=9；
2. condensation: the gas after alkalization enters storage tank after condensing；
3. dispensing: the liquid in storage tank enters in material-compound tank and carries out mix with sodium hydroxide, obtains circulation alkali liquor, circulation alkali Liquid pH >=10；
4. circulation: the original alkali liquor in using circulation alkali liquor to replace step 1. repeats step the most 3. 3 times；
5. methanol rectification: after 3 times circulate, in liquid in storage tank during methanol content >=75wt%, liquid in storage tank is carried out methanol Rectification, obtains methanol and waste water；
Described thick methyl ester dealcoholysis step passes through vacuum pump for being mixed with processed gained gas by dealcoholation treatment gained gas Entering condenser after extraction, condensed liquid enters and reclaims storage tank, reclaims storage tank and is provided with circulating pump, and circulating pump extraction is reclaimed Liquid in tank the most just sprays, and turns again to reclaim storage tank after condensed liquid mixing.
Further, the described storage tank that reclaims itself contains the methanol solution that volume is its volume 15%.
Described concentration of methanol solution is not higher than 15wt%.
Described dealcoholation treatment uses flash tank, and treatment temperature is 75 DEG C.
Described processed uses flash tank, and treatment temperature is 125 DEG C.
As preferably, described circulating pump uses water ring vacuum pump.
When in liquid in described recycling can, methanol content is 45wt%, methanol is recycled.
Through inspection methanol after gas treatment shows alkalescence, waste water is mainly composed of sodium sulfate, methanol contains Amount is 0.8wt%.
Embodiment 3: the low stain production method of a kind of biodiesel, including esterification, ester exchange, thick methyl ester dealcoholysis step, Wherein step of esterification includes gas treatment, and described thick methyl ester dealcoholysis includes dealcoholation treatment and processed, described Gas treatment comprises the following steps: 1. gas alkalization: uses sodium hydroxide solution to spray gas, makes gas pH >=9；
2. condensation: the gas after alkalization enters storage tank after condensing；
3. dispensing: the liquid in storage tank enters in material-compound tank and carries out mix with sodium hydroxide, obtains circulation alkali liquor, circulation alkali Liquid pH >=10；
4. circulation: the original alkali liquor in using circulation alkali liquor to replace step 1. repeats step the most repeatedly；
5. methanol rectification: after repeatedly circulation, in liquid in storage tank during methanol content >=75wt%, liquid in storage tank is carried out first Alcohol rectification, obtains methanol and waste water；
Described thick methyl ester dealcoholysis step passes through vacuum pump for being mixed with processed gained gas by dealcoholation treatment gained gas Entering condenser after extraction, condensed liquid enters and reclaims storage tank, reclaims storage tank and is provided with circulating pump, and circulating pump extraction is reclaimed Liquid in tank the most just sprays, and turns again to reclaim storage tank after condensed liquid mixing.
Described reclaims storage tank itself containing the methanol solution that volume is its volume 25%.Described concentration of methanol solution Not higher than 15wt%.
Described dealcoholation treatment uses flash tank, and treatment temperature is 85 DEG C.
Described processed uses flash tank, and treatment temperature is 135 DEG C.
When in liquid in described recycling can, methanol content is 65wt%, methanol is recycled.
Through inspection methanol shows alkalescence, waste water is mainly composed of sodium sulfate, methanol content is 0.5wt%.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area For art personnel, can there be various modifications and variations in the spirit and principles in the present invention, the modification of these equivalents or replacement etc., Within being all contained in protection scope of the present invention.

Claims (10)

1. a low stain production method for biodiesel, including esterification, ester exchange, thick methyl ester dealcoholysis step, it is characterised in that: Step of esterification includes that gas treatment, described thick methyl ester dealcoholysis include dealcoholation treatment and processed, described gas Process comprises the following steps:
1. gas alkalization: use original alkali liquor to spray gas, make gas pH >=9；
2. condensation: the gas after alkalization enters storage tank after condensing；
3. dispensing: the liquid in storage tank enters in material-compound tank and carries out mix with alkali, obtains circulation alkali liquor；
4. circulation: the original alkali liquor in using circulation alkali liquor to replace step 1. repeats step the most 3. 1 time or repeatedly；
5. methanol rectification: through 1 time or repeatedly circulation after, in liquid in storage tank during methanol content >=65wt%, liquid in storage tank is entered Row methanol rectification, obtains methanol and waste water；
Described thick methyl ester dealcoholysis step passes through vacuum pump for being mixed with processed gained gas by dealcoholation treatment gained gas Entering condenser after extraction, condensed liquid enters and reclaims storage tank, reclaims storage tank and is provided with circulating pump, and circulating pump extraction is reclaimed Liquid in tank the most just sprays, and turns again to reclaim storage tank after condensed liquid mixing.
The low stain production method of a kind of biodiesel the most according to claim 1, it is characterised in that: described step 1. in Alkali liquor be the one in sodium hydroxide solution or potassium hydroxide or mixing.
The low stain production method of a kind of biodiesel the most according to claim 1, it is characterised in that: 3. described step plants Alkali be the one in sodium hydroxide or potassium hydroxide or mixing.
4. according to the low stain production method of a kind of biodiesel described in Claims 2 or 3, it is characterised in that: described step The solute of middle alkali liquor and described step 3. in alkali be material of the same race, for the one in sodium hydroxide or potassium hydroxide.
The low stain production method of a kind of biodiesel the most according to claim 1, it is characterised in that: described step 3. in Circulation alkali liquor pH >=10.
The low stain production method of a kind of biodiesel the most according to claim 1, it is characterised in that: 5. described step exists In liquid in storage tank during methanol content >=75wt%, liquid in storage tank is carried out methanol rectification.
The low stain production method of a kind of biodiesel the most according to claim 1, it is characterised in that: described recovery storage Tank itself is its volume 15～methanol solution of 25% containing volume, and described concentration of methanol solution is not higher than 15wt%.
The low stain production method of a kind of biodiesel the most according to claim 1, it is characterised in that: at described dealcoholysis Reason uses flash tank, and treatment temperature is 75～85 DEG C, and described processed uses flash tank, and treatment temperature is 125～135 ℃。
The low stain production method of a kind of biodiesel the most according to claim 1, it is characterised in that: at described dealcoholysis Reason temperature is 80 DEG C, and described processed temperature is 130 DEG C.
The low stain production method of a kind of biodiesel the most according to claim 1, it is characterised in that: described recycling can When in interior liquid, methanol content is not less than 45wt%, methanol is recycled.
CN201610904574.0A 2016-10-18 2016-10-18 Low-pollution production method for biodiesel Pending CN106318647A (en)

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Application Number Priority Date Filing Date Title
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1995288A (en) * 2006-12-25 2007-07-11 昆明理工大学 Process for preparing biodiesel oil
CN101805671A (en) * 2010-04-09 2010-08-18 上海中器环保科技有限公司 Method for using waste oil for carrying out one-step method acid catalysis to prepare biodiesel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1995288A (en) * 2006-12-25 2007-07-11 昆明理工大学 Process for preparing biodiesel oil
CN101805671A (en) * 2010-04-09 2010-08-18 上海中器环保科技有限公司 Method for using waste oil for carrying out one-step method acid catalysis to prepare biodiesel

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Application publication date: 20170111