CN103242916A - Method for improving stability of bio-oil - Google Patents
Method for improving stability of bio-oil Download PDFInfo
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Abstract
The invention relates to a method for improving the stability of bio-oil. Methyl acetate of different concentration is added to the bio-oil; increase of moisture content can be effectively restrained by adding the methyl acetate through testing the change of the moisture content, the pH value (25 DEG C) and the kinematic viscosity (25 DEG C) of the bio-oil to which the methyl acetate is added or not along with the storage time; the pH value is improved to a certain extent; and the viscosity of the bio-oil can be greatly reduced. Compared with the prior art, the method is simple in process, low in cost, and free of expensive equipment and strict condition, can effectively improve the stability of the bio-oil, and reduces the viscosity of the bio-oil. The obtained bio-oil can be effectively stored for more than 42 days at 40 DEG C, and has positive guiding significance on further amplification of the application range of the bio-oil.
Description
Technical field
The present invention relates to a kind of method of adjusting the bio oil performance, especially relate to a kind of method that improves bio oil stability.
Background technology
The dual crisis of energy and environment is the significant challenge that face this century.By present explored energy reserve in the world, oil will be exhausted in 40 years, and Sweet natural gas will exhaust in 60 years, and coal resources still can be exploited about 200 years.Simultaneously, a large amount of uses of fossil oil can cause acid rain, Greenhouse effect, thereby cause vegetation deterioration, and a series of ecological problems such as species diversity reduction have a strong impact on continuous development of society economy.
Biomass energy is the fourth-largest energy that is only second to oil, Sweet natural gas, coal, based on its green, cleaning, renewable, advantage such as raw material sources are abundant, the development research of biomass energy is become the emphasis of various countries' work.Propose in " the medium-term and long-term development program of renewable energy source ": progressively improve the ratio of high-quality clean reproducible energy in energy structure, strive making the renewable energy source consumption reach 15% of total energy consumption to the year two thousand twenty, make renewable energy technologies have the tangible market competitiveness.
The seventies in last century, the outburst of oil crisis makes people begin to pay attention to the biomass liquefying Study on Technology.By using liquefaction technology, after Wood Adhesives from Biomass is bio oil, its energy density is greatly improved, be more convenient for simultaneously transporting and storage, not only can be directly used in the burning of thermodynamics equipment such as existing boiler, and can make its quality close to the quality of fossil oils such as diesel oil by further refining processing, therefrom separation and Extraction goes out the chemical of high added value in addition.Based on this, can realize that the mass-producing of biomass resource and modernization utilize.
Biomass through pyrolysis is one of important way of biomass liquefying technology, enjoys people to pay close attention to owing to having wide industrial prospect.The biomass through pyrolysis technology refers to that biomass heat temperature raising under anaerobic or anoxia condition causes that the cracking of biomass polymer produces bio oil, combustible gas and charcoal.A series of polyreaction can slowly take place and cause its viscosity to increase in bio oil at normal temperatures, and the uniform bio oil of character will produce layering when being increased to a certain degree.In addition, bio oil also has high ignition temperature, high viscosity, severe corrosive is with fossil oil mixing not, general character such as high carbon residue content, this makes bio oil be difficult to directly apply to existing installation, must further improve its relevant nature, and wherein most critical is to improve its stability.
Bio oil is the high complicated organic mixture of oxygen level, comprises most oxygen-bearing organic matters, as ether, ester, aldehyde, ketone, phenol, pure and mild organic acid etc.Oxygen in the bio oil mainly comes from phenols that the degraded of Mierocrystalline cellulose in the biomass material, hemicellulose and xylogen produces and the similar various oxygen-containing functional groups of poly-phenolic compound.Rich oxygen content makes that bio oil poor stability, calorific value are low, corrodibility by force, not volatile, and can not dissolve each other with alkane.Therefore, want directly bio oil must to reduce oxygen level through further modification as high-grade energy.
In storage process, between the unsaturated link(age) polymerization slowly or polycondensation can take place, esterification can take place in hydroxyl and carboxyl, and etherification reaction can take place for hydroxyl and carbonyl, these aging reactions cause the molecular-weight average of bio oil to increase, and macro manifestations is that viscosity increases.The cornstalk bio oil is measured in the kinematic viscosity under the differing temps, found when temperature is lower than 85 ℃, biological oil viscosity raises along with temperature and reduces, and meets the sticking warm universal correlation function of liquid; When temperature was higher than 85 ℃, biological oil viscosity raise along with temperature and rises.Result of study shows that there are reactions such as polymerization, esterification in bio oil inside, and small-molecule substance reaction generates macromolecular substance and causes the bio oil apparent viscosity to increase, and high temperature is conducive to reaction and carries out.Therefore, bio oil is left under the low temperature environment can inhibited reaction, increases stability.
The water that the moisture that biomass material itself has and heat scission reaction process generate, add that bio oil has very strong water absorbability, can absorb airborne water molecules, simultaneously, the inner a series of aging reactions that take place of bio oil also can produce a certain amount of water molecules, so the water ratio of bio oil is very high.Contain a certain amount of water in the bio oil and can reduce its viscosity, change system pH, but along with the shelf-time prolongs, moisture content has surpassed certain limit (30%), inner each the component compole gender gap of bio oil enlarges gradually, originally the liquid of homogeneous just is difficult to keep evenly layering can occurring: one is highly viscous material mutually; Another is mutually for containing the liquid phase of water and soluble substance.
At present how a lot of scholars have done a large amount of research to improving bio oil stability, as by shortening, and catalytic pyrolysis, gas phase catalysis, modes such as steam reforming and emulsification also can be mixed some organic solvents and be improved its quality.Find by the retrieval to document, improve the bio oil Study on Stability by the interpolation methyl acetate and do not appear in the newspapers as yet.
Summary of the invention
Purpose of the present invention is exactly to propose a kind of by adding the method for methyl acetate raising bio oil stability for the defective that overcomes above-mentioned prior art existence.The aging reaction of bio oil inside can produce water, and the water ratio increase can cause bio oil physico-chemical property instability, causes layering; Reduce the bio oil water ratio, can improve its stability.The pH value is to estimate whether stable another index of bio oil, and pH value descends, and is conducive to aging reaction and carries out, so control the pH value and can improve bio oil stability.Viscosity is as estimating the important index whether bio oil inside aging reaction takes place, and its absolute value is more little, and relative growth rate is more little, illustrates that then the inner aging reaction of bio oil is inhibited, and stability is improved.Add and bio oil water ratio, kinematic viscosity (25 ℃) and the pH value (25 ℃) of the adding methyl acetate variation discovery with waiting time by test, add the increase that methyl acetate can effectively suppress water ratio, improve its pH value to a certain extent, and can reduce biological oil viscosity dramatically.Therefore, the present invention has directive significance to the range of application of further expansion bio oil.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of method that improves bio oil stability by add the stability that ethyl acetate improves bio oil in the bio oil for preparing, specifically may further comprise the steps:
(1) biomass material is prepared: be raw material with the pine wood chip, behind the screening particle diameter under 105 ℃ of temperature dry 24h;
(2) producing of bio oil: adopt the bubbling fluidized bed biomass fast pyrolysis device, control heat scission reaction temperature is 500 ℃, and fluidizing agent is nitrogen, and fluidising air velocity is 60Lmin
-1, be that raw material is produced bio oil with dried pine wood chip;
(3) in bio oil, add methyl acetate: in the bio oil for preparing, add methyl acetate, namely obtain methyl acetate after mixing and handle bio oil, place the encloses container storage to get final product.
The particle diameter of the pine wood chip that screening obtains is 30～80 orders.
Described bubbling fluidized bed biomass fast pyrolysis device is made of the deuterostrophies feeder, bubbling style fluidized-bed reactor, cyclonic separator, hot steam strainer, the continuous condenser of level Four, the static trap that connect successively.
Described methyl acetate is the analytical pure methyl acetate, pureness specifications 〉=99.5%.
Described methyl acetate addition in bio oil is 4～20wt%.
Described methyl acetate addition in bio oil is preferably 20wt%.
Described methyl acetate is handled bio oil and is stored in encloses container in 40 ℃.
Compared with prior art, the present invention has following beneficial effect:
1, technology is simple, and this method only needs to add a certain amount of methyl acetate in bio oil, mixes the sealing storage, does not need bio oil is carried out complicated processing treatment; Cost is low, does not need expensive equipment and strict condition.
2, adding mass percent concentration in bio oil is that 4%～20% methyl acetate (〉=99.5%) can effectively improve bio oil stability, reduces bio oil viscosity, can effectively store more than 42 days under 40 ℃.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment.
Embodiment 1
Be raw material with the pine wood chip, adopt Shanghai Communications University's agricultural and the bubbling fluidized bed biomass fast pyrolysis device of biomass energy engineering center of biological institute independent development to produce bio oil.The bubbling fluidized bed biomass fast pyrolysis device is made of the deuterostrophies feeder, bubbling style fluidized-bed reactor, cyclonic separator, hot steam strainer, the continuous condenser of level Four, the static trap that connect successively.
Concrete steps are:
The first step, biomass material are prepared: adopt the pine wood chip, after the screening of different meshes sieve, get the pine wood chip after the screening, dry 24h under 105 ℃ of temperature; Pine wood chip after the described screening, particle diameter are 30 orders;
In second step, the producing of bio oil: adopting the bubbling fluidized bed biomass fast pyrolysis device, is that raw material is produced bio oil with dried pine wood chip, and its heat scission reaction temperature is 500 ℃, and fluidizing agent is nitrogen, and fluidising air velocity is 60Lmin
-1
In the 3rd step, calculate the methyl acetate addition: calculate that to add mass percent concentration in a certain amount of bio oil be the quality of 4% required methyl acetate; Described methyl acetate is the analytical pure methyl acetate, pureness specifications 〉=99.5%;
In the 4th step, in bio oil, add methyl acetate: take by weighing a certain amount of new system bio oil, add and calculate required methyl acetate, make methyl acetate after mixing and handle bio oil, place encloses container to store; The storage condition is 40 ℃ of steady temperatures.
Made bio oil being divided into the blank group and adding mass percent concentration is 4% methyl acetate group.The sealing of 2 groups of bio oil left under 40 ℃ of drying conditionss store 42d, measure bio oil characteristic (water ratio, pH value (25 ℃), kinematic viscosity (25 ℃)) with the Changing Pattern of period of storage (42d).Add methyl acetate to improving the effect of bio oil stability with the test data explanation of storing 0 day and storing 42 days below.
The water cut test result shows, blank group water ratio is increased to 39.58% from 36.48%, has increased by 8.50%; The bio oil water ratio that contains 4% methyl acetate is increased to 36.63% from 35.40%, has increased by 3.47%.Compare with the blank group, the bio oil initial aqueous rate of adding 4% methyl acetate descends, and its rate of increase is organized less than blank.
PH value test result shows, blank group pH value (25 ℃) rises to 3.35 from 2.88, has increased by 16.32%; The pH value (25 ℃) that contains the bio oil of 4% methyl acetate rises to 3.34 from 3.01, has increased by 10.96%.This shows, though add the rate of increase that 4% methyl acetate has reduced the pH value, can improve the pH value of bio oil.
The viscosity test result shows that blank group viscosity (25 ℃) is from 7.429mm
2S
-1Be increased to 16.420mm
2S
-1, increased by 1.210 times.Contain the bio oil viscosity (25 ℃) of 4% methyl acetate from 6.264mm
2S
-1Be increased to 8.255mm
2S
-1, increased by 0.318 times.Compare with the blank group, the bio oil initial viscosity that adds 4% methyl acetate descends to some extent, and its rate of increase is organized less than blank.
Embodiment 2
Be raw material with the pine wood chip, adopt Shanghai Communications University's agricultural and the bubbling fluidized bed biomass fast pyrolysis device of biomass energy engineering center of biological institute independent development to produce bio oil.Concrete steps are:
The first step, biomass material are prepared: adopt the pine wood chip, after the screening of different meshes sieve, get the pine wood chip after the screening, dry 24h under 105 ℃ of temperature; Pine wood chip after the described screening, particle diameter are 50 orders.
In second step, the producing of bio oil: adopting the bubbling fluidized bed biomass fast pyrolysis device, is that raw material is produced bio oil with dried pine wood chip, and its heat scission reaction temperature is 500 ℃, and fluidizing agent is nitrogen, and fluidising air velocity is 60Lmin
-1
In the 3rd step, calculate the methyl acetate addition: calculate that to add mass percent concentration in a certain amount of bio oil be the quality of 8% required methyl acetate; Described methyl acetate is the analytical pure methyl acetate, pureness specifications 〉=99.5%;
In the 4th step, in bio oil, add methyl acetate: take by weighing a certain amount of new system bio oil, add and calculate required methyl acetate, make methyl acetate after mixing and handle bio oil, place encloses container to store; The storage condition is 40 ℃ of steady temperatures.
Made bio oil being divided into the blank group and adding mass percent concentration is 8% methyl acetate group.The sealing of 2 groups of bio oil left under 40 ℃ of drying conditionss store 42d, measure bio oil characteristic (water ratio, pH value (25 ℃), kinematic viscosity (25 ℃)) with the Changing Pattern of period of storage (42d).Add methyl acetate to improving the effect of bio oil stability with the test data explanation of storing 0 day and storing 42 days below.
The water cut test result shows, blank group water ratio is increased to 39.58% from 36.48%, has increased by 8.50%, and the bio oil water ratio that contains 8% methyl acetate drops to 31.95% from 34.49%, has descended 7.36%.Compare with the blank group, the bio oil initial aqueous rate of adding 8% methyl acetate descends, and its rate of increase is less than blank group (showing as negative growth).
PH value test result shows, blank group pH value (25 ℃) rises to 3.35 from 2.88, has increased by 16.32%; The pH value (25 ℃) that contains the bio oil of 8% methyl acetate rises to 3.44 from 3.14, has increased by 9.55%.This shows, though add the rate of increase that 8% methyl acetate has reduced the pH value, can improve the pH value of bio oil.
The viscosity test result shows that blank group viscosity (25 ℃) is from 7.429mm
2S
-1Be increased to 16.420mm
2S
-1, increased by 1.210 times.Contain the bio oil viscosity (25 ℃) of 8% methyl acetate from 5.491mm
2S
-1Be increased to 7.015mm
2S
-1, increased by 0.278 times.Compare with the blank group, the bio oil initial viscosity that adds 8% methyl acetate descends by a relatively large margin, and its rate of increase is organized less than blank.
Embodiment 3
Be raw material with the pine wood chip, adopt Shanghai Communications University's agricultural and the bubbling fluidized bed biomass fast pyrolysis device of biomass energy engineering center of biological institute independent development to produce bio oil.Concrete steps are:
The first step, biomass material are prepared: adopt the pine wood chip, after the screening of different meshes sieve, get the pine wood chip after the screening, dry 24h under 105 ℃ of temperature; Pine wood chip after the described screening, particle diameter are 60 orders.
In second step, the producing of bio oil: adopting the bubbling fluidized bed biomass fast pyrolysis device, is that raw material is produced bio oil with dried pine wood chip, and its heat scission reaction temperature is 500 ℃, and fluidizing agent is nitrogen, and fluidising air velocity is 60Lmin
-1
In the 3rd step, calculate the methyl acetate addition: calculate that to add mass percent concentration in a certain amount of bio oil be the quality of 12% required methyl acetate; Described methyl acetate is the analytical pure methyl acetate, pureness specifications 〉=99.5%;
In the 4th step, in bio oil, add methyl acetate: take by weighing a certain amount of new system bio oil, add and calculate required methyl acetate, make methyl acetate after mixing and handle bio oil, place encloses container to store; The storage condition is 40 ℃ of steady temperatures.
Made bio oil being divided into the blank group and adding mass percent concentration is 12% methyl acetate group.The sealing of 2 groups of bio oil left under 40 ℃ of drying conditionss store 42d, measure bio oil characteristic (water ratio, pH value (25 ℃) kinematic viscosity (25 ℃)) with the Changing Pattern of period of storage (42d).Add methyl acetate to improving the effect of bio oil stability with the test data explanation of storing 0 day and storing 42 days below.
The water cut test result shows, blank group water ratio is increased to 39.58% from 36.48%, has increased by 8.50%, and the bio oil water ratio that contains 12% methyl acetate is reduced to 31.63% from 32.29%, has reduced by 2.04%.Compare with the blank group, the bio oil initial aqueous rate of adding 12% methyl acetate descends, and its rate of increase is organized less than blank, and shows as negative growth.
PH value test result shows, blank group pH value (25 ℃) rises to 3.35 from 2.88, has increased by 16.32%; The pH value (25 ℃) that contains the bio oil of 12% methyl acetate rises to 3.43 from 3.18, has increased by 7.86%.This shows, though add the rate of increase that 12% methyl acetate has reduced the pH value, can improve the pH value of bio oil.
The viscosity test result shows that blank group viscosity (25 ℃) is from 7.429mm
2S
-1Be increased to 16.420mm
2S
-1, increased by 1.210 times.Contain the bio oil viscosity (25 ℃) of 12% methyl acetate from 4.774mm
2S
-1Be increased to 5.835mm
2S
-1, increased by 0.222 times.Compare with the blank group, the bio oil initial viscosity that adds 12% methyl acetate descends significantly, and its rate of increase is organized less than blank.
Embodiment 4
Be raw material with the pine wood chip, adopt Shanghai Communications University's agricultural and the bubbling fluidized bed biomass fast pyrolysis device of biomass energy engineering center of biological institute independent development to produce bio oil.Concrete steps are:
The first step, biomass material are prepared: adopt the pine wood chip, after the screening of different meshes sieve, get the pine wood chip after the screening, dry 24h under 105 ℃ of temperature; Pine wood chip after the described screening, particle diameter are 80 orders.
In second step, the producing of bio oil: adopting the bubbling fluidized bed biomass fast pyrolysis device, is that raw material is produced bio oil with dried pine wood chip, and its heat scission reaction temperature is 500 ℃, and fluidizing agent is nitrogen, and fluidising air velocity is 60Lmin
-1
In the 3rd step, calculate the methyl acetate addition: calculate that to add mass percent concentration in a certain amount of bio oil be the quality of 16% required methyl acetate; Described methyl acetate is the analytical pure methyl acetate, pureness specifications 〉=99.5%;
In the 4th step, in bio oil, add methyl acetate: take by weighing a certain amount of new system bio oil, add and calculate required methyl acetate, make methyl acetate after mixing and handle bio oil, place encloses container to store; The storage condition is 40 ℃ of steady temperatures.
Made bio oil being divided into the blank group and adding mass percent concentration is 16% methyl acetate group.The sealing of 2 groups of bio oil left under 40 ℃ of drying conditionss store 42d, measure bio oil characteristic (water ratio, pH value (25 ℃), kinematic viscosity (25 ℃)) with the Changing Pattern of period of storage (42d).Add methyl acetate to improving the effect of bio oil stability with the test data explanation of storing 0 day and storing 42 days below.
The water cut test result shows, blank group water ratio is increased to 39.58% from 36.48%, has increased by 8.50%, and the bio oil water ratio that contains 16% methyl acetate is reduced to 29.61% from 30.88%, has reduced by 4.11%.Compare with the blank group, the bio oil initial aqueous rate of adding 16% methyl acetate descends, and its rate of increase is organized less than blank, and shows as negative growth.
PH value test result shows, blank group pH value (25 ℃) rises to 3.35 from 2.88, has increased by 16.32%; The pH value (25 ℃) that contains the bio oil of 16% methyl acetate rises to 3.49 from 3.31, has increased by 5.44%.This shows, though add the rate of increase that 16% methyl acetate has reduced the pH value, can effectively improve the pH value of bio oil.
The viscosity test result shows that blank group viscosity (25 ℃) is from 7.429mm
2S
-1Be increased to 16.420mm
2S
-1, increased by 1.210 times.Contain the bio oil viscosity (25 ℃) of 16% methyl acetate from 4.136mm
2S
-1Be increased to 5.105mm
2S
-1, increased by 0.234 times.Compare with the blank group, the bio oil initial viscosity that adds 16% methyl acetate descends significantly, and its rate of increase is organized less than blank.
Embodiment 5
Be raw material with the pine wood chip, adopt Shanghai Communications University's agricultural and the bubbling fluidized bed biomass fast pyrolysis device of biomass energy engineering center of biological institute independent development to produce bio oil.Concrete steps are:
The first step, biomass material are prepared: adopt the pine wood chip, after the screening of different meshes sieve, get the pine wood chip after the screening, dry 24h under 105 ℃ of temperature; Pine wood chip after the described screening, particle diameter are 40 orders.
In second step, the producing of bio oil: adopting the bubbling fluidized bed biomass fast pyrolysis device, is that raw material is produced bio oil with dried pine wood chip, and its heat scission reaction temperature is 500 ℃, and fluidizing agent is nitrogen, and fluidising air velocity is 60Lmin
-1
In the 3rd step, calculate the methyl acetate addition: calculate that to add mass percent concentration in a certain amount of bio oil be the quality of 20% required methyl acetate; Described methyl acetate is the analytical pure methyl acetate, pureness specifications 〉=99.5%;
In the 4th step, in bio oil, add methyl acetate: take by weighing a certain amount of new system bio oil, add and calculate required methyl acetate, make methyl acetate after mixing and handle bio oil, place encloses container to store; The storage condition is 40 ℃ of steady temperatures.
Made bio oil being divided into the blank group and adding mass percent concentration is 20% methyl acetate group.The sealing of 2 groups of bio oil left under 40 ℃ of drying conditionss store 42d, measure bio oil characteristic (water ratio, pH value (25 ℃), kinematic viscosity (25 ℃)) with the Changing Pattern of period of storage (42d).Add methyl acetate to improving the effect of bio oil stability with the test data explanation of storing 0 day and storing 42 days below.
The water cut test result shows, blank group water ratio is increased to 39.58% from 36.48%, has increased by 8.50%, and the bio oil water ratio that contains 20% methyl acetate is reduced to 29.25% from 30.17%, has reduced by 3.05%.Though add the rate of increase that methyl acetate has reduced water ratio, water ratio obviously descends.
PH value test result shows, blank group pH value (25 ℃) rises to 3.35 from 2.88, has increased by 16.32%; The pH value (25 ℃) that contains the bio oil of 20% methyl acetate rises to 3.61 from 3.40, has increased by 6.18%.This shows, though add the rate of increase that 20% methyl acetate has reduced the pH value, can effectively improve the pH value of bio oil.
The viscosity test result shows that blank group viscosity (25 ℃) is from 7.429mm
2S
-1Be increased to 16.420mm
2S
-1, increased by 1.210 times.Contain the bio oil viscosity (25 ℃) of 20% methyl acetate from 3.618mm
2S
-1Be increased to 4.452mm
2S
-1, increased by 0.231 times.Compare with the blank group, the bio oil initial viscosity that adds 20% methyl acetate descends significantly, and its rate of increase is organized less than blank.
Comparative example 1～5 finds that when the methyl acetate mass percent concentration that adds was 20%, the initial aqueous rate of gained bio oil was minimum, and initial viscosity is minimum, and initial pH is the highest; Store after 42 days, the water ratio of bio oil (adding 20% methyl acetate) still all is lower than other each concentration groups, the pH value is the highest, viscosity is minimum, and the effect that suppresses the viscosity growth in storage process is the most obvious, therefore, take all factors into consideration, the methyl acetate best in quality percentage concentration that adds is 20%.
Claims (7)
1. a method that improves bio oil stability is characterized in that, this method specifically may further comprise the steps by add the stability that ethyl acetate improves bio oil in the bio oil for preparing:
(1) biomass material is prepared: be raw material with the pine wood chip, behind the screening particle diameter under 105 ℃ of temperature dry 24h;
(2) producing of bio oil: adopt the bubbling fluidized bed biomass fast pyrolysis device, control heat scission reaction temperature is 500 ℃, and fluidizing agent is nitrogen, and fluidising air velocity is 60Lmin
-1, be that raw material is produced bio oil with dried pine wood chip;
(3) in bio oil, add methyl acetate: in the bio oil for preparing, add methyl acetate, namely obtain methyl acetate after mixing and handle bio oil, place the encloses container storage to get final product.
2. a kind of method that improves bio oil stability according to claim 1 is characterized in that, the particle diameter of the pine wood chip that screening obtains is 30～80 orders.
3. a kind of method that improves bio oil stability according to claim 1, it is characterized in that, described bubbling fluidized bed biomass fast pyrolysis device is made of the deuterostrophies feeder, bubbling style fluidized-bed reactor, cyclonic separator, hot steam strainer, the continuous condenser of level Four, the static trap that connect successively.
4. a kind of method that improves bio oil stability according to claim 1 is characterized in that, described methyl acetate is the analytical pure methyl acetate, pureness specifications 〉=99.5%.
5. a kind of method that improves bio oil stability according to claim 1 is characterized in that, described methyl acetate addition in bio oil is 4～20wt%.
6. a kind of method that improves bio oil stability according to claim 1 or 5 is characterized in that described methyl acetate addition in bio oil is preferably 20wt%.
7. a kind of method that improves bio oil stability according to claim 1 is characterized in that, described methyl acetate is handled bio oil and stored in encloses container in 40 ℃.
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