CN106479678A - Using alcoholysis method by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol - Google Patents
Using alcoholysis method by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol Download PDFInfo
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- 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
- C11B13/00—Recovery of fats, fatty oils or fatty acids from waste materials
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N3/00—Preservation of plants or parts thereof, e.g. inhibiting evaporation, improvement of the appearance of leaves or protection against physical influences such as UV radiation using chemical compositions; Grafting wax
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/36—Hydroxylated esters of higher fatty acids
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/74—Recovery of fats, fatty oils, fatty acids or other fatty substances, e.g. lanolin or waxes
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- Polymers & Plastics (AREA)
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Abstract
The present invention relates to a kind of utilization alcoholysis method, by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol, belongs to solid waste resource recovery and utilizes field.The method includes：(1) the useless oil degumming pretreatment of kitchen；(2) alcoholysis is carried out to kitchen waste oil using the small molecular alcohol of polyfunctionality.The present invention carries out alcoholysis with the small molecular alcohol of polyfunctionality to kitchen waste oil, introduces hydroxyl, thus obtaining kitchen waste oil polyhydric alcohol, product hydroxyl value can reach 307.9mgKOH/g on strand.The invention provides a kind of kitchen waste oil resource utilization ways, both the environmental pollutions such as the improper waste water bringing of kitchen waste oil disposal, waste gas can have been solved the problems, such as, in addition kitchen waste oil wide material sources, cheap, can reduce the production cost of polyurethane polyhydric alcohol with it for raw material again.
Description
Technical field
The present invention relates to a kind of utilization alcoholysis method is by the optimization of process conditions side of kitchen waste oil synthesis of polyurethane polyhydric alcohol
Method, belongs to solid waste resource recovery and utilizes field.
Background technology
Polyurethane full name is polyurethanes (Polyurethane, PU), is the various multipurpose of a class product form
Synthetic resin, it is with products such as foam plasticss, elastomer, coating, adhesive, fiber, synthetic leather, waterproof material and pavement materials
Form, is widely used in each field.Because polyurethane formulations are flexible, product form is various, product propertiess are excellent, in all trades and professions
Application more and more extensive, at present, more than 1,500,000 tons, market annual rate of growth is left 10% for China's polyurethane product annual production
The right side, development is steadily.But, traditionally two primary raw material polyhydric alcohol of synthesis of polyurethane the same with most polymers material
(Polyol) and isocyanates derive from non-renewable petroleum resources, therefore traditional petroleum base polyurethane material exists many
Shortcoming, for example：Because fossil resources price fluctuation is big, and increasingly depleted, cause production cost Continued；The disappearing of petroleum chemicals
Consumption produces CO2With other harmful gass, atmosphere pollution, aggravate greenhouse effect；Product is difficult to biodegradation, harm environment etc..Cause
This is the requirement meeting Green Chemistry and sustainable development, and the problem seeking novel polyurethane raw material becomes polyurethane material field
Hot research content.
Kitchen waste oil as one of the most cheap and yield biomass material the abundantest, with its hypotoxicity, itself can
Biological degradability and wide material sources, cheap the advantages of, receive much concern in polymer raw material research.Kitchen waste oil includes ground
Ditch oil, frying waste oil and swill oil etc. stem from the waste grease of catering trade, and composition is mainly in vegetable oil for cooking and food
Animal oil, chemical composition is mainly triglycerides.Kitchen waste oil quality extreme difference, poisonous and harmful element severe overweight, directly
Discharge causes water pollution；Long-term take in cause alimentary toxicosis, induce an illness, even carcinogenic.The waste cooking oil of 1kg flows into water
Body, can pollute 15000m2The water surface.Food-safety problem frequently occurs in recent years, and consumers in general's body and psychology are all made
Become serious infringement, therefore will prevent kitchen waste oil and return to dining table, more will forbid directly discharging.National restaurant unit produces every year
The stock number of kitchen waste grease be 276.5 ten thousand t it is considered to resource recovery, can collection and utilization stock number be 2,000,000 t.Profit
It is that polyurethane polyhydric alcohol prepared by raw material with kitchen waste oil, both can solve the improper waste water bringing of kitchen waste oil disposal, waste gas
Deng the problem of environmental pollution, can prevent kitchen waste oil from returning dining table simultaneously, endanger human health.Therefore, explore kitchen waste oil
The optimization of process conditions method of synthesis of polyurethane polyhydric alcohol becomes the task of top priority.
Content of the invention
It is an object of the invention to provide a kind of used kitchen waste oil synthesis of polyurethane using alcoholysis method (Alcoholysis)
The optimum process condition of polyhydric alcohol (Polyol).
The present invention utilizes alcoholysis method (Alcoholysis), carries out alcohol with the small molecular alcohol of polyfunctionality to kitchen waste oil
Solution, introduces hydroxyl, thus obtaining kitchen waste oil polyhydric alcohol on strand.The essence of alcoholysis is to pass through to add in reactant mixture
Enter excessive hydroxyl, so that effective hydroxyl redistributing on reactive carboxyl.
A kind of utilization alcoholysis method, by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol, comprises the following steps：(1) kitchen
Useless oil degumming pretreatment；(2) alcoholysis is carried out to kitchen waste oil using the small molecular alcohol of polyfunctionality.
(1) the useless oil degumming pretreatment of kitchen：
Kitchen waste oil is mixed with distilled water, heats and stir, when temperature is increased to 60-70 DEG C, add phosphoric acid, constant temperature continues
Continuous stirring a period of time, filtered while hot, filtrate is placed in stratification in separatory funnel, discards lower floor's waste liquid, then use equivalent
Hot wash supernatant liquid be 6.8-7.2 to pH, by the liquid regulating pH be placed in drying baker dry, obtain final product refined kitchen
Waste oil.
Preferably, the volume ratio that kitchen waste oil is mixed with distilled water is 2:1-3:1；The addition of phosphoric acid is 0.1-
0.2wt%, phosphoric acid concentration is 85wt%；The time that constant temperature continues stirring is 20-50min；The temperature of hot water is more than 70 DEG C；Dry
Dry temperature is 100-120 DEG C, and drying time is 2-4h.
Described kitchen waste oil includes frying waste oil, swill oil and waste oil etc..
Peptized impurities (mainly phospholipid) in kitchen waste oil are the stable factors of impact oils and fatss, in oil alkali refining process
In can promote emulsifying, increase operating difficultiess it is therefore desirable to removing.By adding mineral acid, by the nonhydratable phosphorus in kitchen waste oil
Fat is converted into hydrated phospholipid, and in phospholipid hydration process, hydrophobic group is attached to water away from hydrone, hydrophilic group towards periphery, is formed
Micelle, produces density contrast with oils and fatss, therefore can separate.
(2) carry out alcoholysis using the process conditions optimizing：
The small molecular alcohol of the refined kitchen waste oil obtaining after degumming pretreatment and polyfunctionality is in molar ratio 5.5:1-
6.5:It is placed in the four-hole boiling flask with agitating device and thermometer after 1 mixing, after air in logical nitrogen emptying bottle, four mouthfuls are burnt
Bottle sealing, begins to warm up and does not stop to stir, and rises to temperature and is 185-195 DEG C, adds 0.1-0.2wt% calcium oxide as catalysis
Agent, continues heated at constant temperature 80-100min, obtains the alcoholysis product containing polyurethane polyhydric alcohol.
Preferably, the small molecular alcohol of described polyfunctionality is glycerol；Refined kitchen waste oil and the small molecule of polyfunctionality
Alcohol (alcohol oil) mol ratio is 6:1, alcoholysis reaction temperature is 190 DEG C, and the alcoholysis reaction time is 90min, and catalyst amount is
0.13wt%.
In order to improve the hydroxyl value of kitchen waste oil synthesis of polyurethane polyhydric alcohol, the present inventor couple further using alcoholysis method
Using alcoholysis method, the process conditions of kitchen waste oil synthesis of polyurethane polyhydric alcohol are optimized research, real by single factor test
Test, probed into molar ratio of methanol to oil, reaction temperature, response time to polyurethane polyhydric alcohol hydroxyl value and product acid fall rate
Impact is it is determined that optimum process condition.
1) utilize alcoholysis method by the optimum process condition of kitchen waste oil synthesis of polyurethane polyhydric alcohol
Using alcoholysis method, three reaction factors of kitchen waste oil synthesis of polyurethane polyhydric alcohol are：Molar ratio of methanol to oil, anti-
Answer temperature and response time.Optimum process condition is 6 for molar ratio of methanol to oil:1, optimal reaction temperature is 190 DEG C, during optimum response
Between be 90min.During using alcoholysis method by kitchen waste oil synthesis of polyurethane polyhydric alcohol, hydroxyl value may be up to 307.9mgKOH/g.
2) utilize alcoholysis method by fall rate most preferably sour in kitchen waste oil synthesis of polyurethane polyol process
Raw material acid number has certain impact to the quality of polyurethane products.Meanwhile, acid number is also to evaluate oil quality quality
An important indicator.The present invention utilizes alcoholysis method by kitchen waste oil synthesis of polyurethane polyhydric alcohol, under optimum process condition, produces
Thing acid fall rate reaches 95.08%.
Advantages of the present invention and beneficial effect are：
The invention provides a kind of kitchen waste oil resource utilization ways, both can solve that kitchen waste oil disposal is improper to bring
Waste water, the problem of the environmental pollution such as waste gas, in addition kitchen waste oil wide material sources, cheap, can be dropped with it for raw material again
The production cost of oligourethane polyhydric alcohol.
The invention provides using the optimum process condition of kitchen waste oil synthesis of polyurethane polyhydric alcohol, this process conditions is grasped
Make simple, convenient control, at optimum conditions, polyurethane with polyhydric alcohol hydroxyl value is higher, yield is higher, in terms of industrialized production
More there is vast potential for future development.
Brief description
Fig. 1 is the impact to product hydroxyl value for the molar ratio of methanol to oil.
Fig. 2 is the impact to product hydroxyl value for the temperature.
Fig. 3 is the impact to product acid fall rate for the molar ratio of methanol to oil.
Fig. 4 is the impact to product acid fall rate for the temperature.
Fig. 5 is kitchen waste oil and the contrast of alcoholysis product infrared spectrum.
Specific embodiment
The present invention utilizes alcoholysis method (Alcoholysis) by kitchen waste oil synthesis of polyurethane with polyhydric alcohol (Polyol), has
Body carries out alcoholysis using the small molecular alcohol glycerol of polyfunctionality to kitchen waste oil, introduces hydroxyl, thus being eaten on strand
Kitchen waste oil polyhydric alcohol.And respectively pass through orthogonal and experiment of single factor, probe into molar ratio of methanol to oil, alcohol water mol ratio, reaction temperature,
The impact to product hydroxyl value for the response time, obtains the optimum process condition of alcoholysis.
1. the useless oil degumming pretreatment of kitchen
Peptized impurities (mainly phospholipid) in kitchen waste oil are the stable factors of impact oils and fatss, in oil alkali refining process
In can promote emulsifying, increase operating difficultiess it is therefore desirable to removing.By adding mineral acid, by the nonhydratable phosphorus in kitchen waste oil
Fat is converted into hydrated phospholipid, and in phospholipid hydration process, hydrophobic group is attached to water away from hydrone, hydrophilic group towards periphery, is formed
Micelle, produces density contrast with oils and fatss, therefore can separate.
By kitchen waste oil and distilled water, (volume ratio is 2 by a certain percentage:1-3:1) mix, heat and stir, temperature raises
During to 60-70 DEG C, add the phosphoric acid (concentration is 85wt%) of 0.1-0.2wt%, constant temperature continues stirring 20-50min, mistake while hot
Filter, filtrate is placed in stratification in separatory funnel, discards lower floor's waste liquid, then washed with the hot water (more than 70 DEG C) of equivalent
Layer liquid is 6.8-7.2 to pH, the liquid regulating pH is placed in baking 2-4h in 100-120 DEG C of drying baker, obtains final product refined kitchen
Waste oil.
The present embodiment carries out the useless oil degumming pretreatment of kitchen using following concrete technology condition：By kitchen waste oil and steaming
Distilled water is 2.5 by volume:1 mixing, is placed in the beaker with thermometer and agitating device, assay device is placed in oil bath pan
In, begin to warm up and do not stop to stir, when temperature is increased to 65 DEG C, add the phosphoric acid (concentration is 85wt%) of 0.15wt%, permanent
Temperature continues stirring 30min, has heated rear filtered while hot, filtrate is placed in stratification in separatory funnel, discarded lower floor's waste liquid, so
Washing supernatant liquid afterwards with the hot water (more than 70 DEG C) of equivalent to pH is 6, and the liquid regulating pH is placed in 110 DEG C of drying baker
Dry 3h, obtain final product refined kitchen waste oil.
2. utilize alcoholysis method by the optimization of process conditions of kitchen waste oil synthesis of polyurethane polyhydric alcohol
In order to be accurately determined optimum process condition, carry out experiment of single factor on the basis of determining influence factor, will take off
The refined kitchen waste oil obtaining after glue pretreatment and glycerol are placed in after mixing by a certain percentage with agitating device and thermometer
In four-hole boiling flask, after air, four-hole boiling flask is sealed in logical nitrogen emptying bottle, begin to warm up and do not stop to stir, rise to a constant temperature
Degree, adds 0.13wt% calcium oxide as catalyst, continues heated at constant temperature certain time, reaction measure after terminating product hydroxyl value and
Acid number, and characterized with infrared.
The impact to product hydroxyl value for 2.1 molar ratio of methanol to oil
Ester bond and small molecular alcohol using kitchen waste oil occur ester exchange reaction that it is carried out with alcoholysis, and it is little that this experiment adopts
Molecule alcohol is glycerol, because reaction has balance, thus excessive using alcohol, take the ratio of the amount of material of glycerol and kitchen waste oil
(molar ratio of methanol to oil) is 4:1、5:1、6:1、7:1 and 8:1 is reacted, each group is reacted different time (30min, 60min,
90min, 120min, 150min and 180min), reaction temperature is 190 DEG C, and the impact to product hydroxyl value for the molar ratio of methanol to oil is such as
Shown in Fig. 1.As seen from Figure 1, during different molar ratio of methanol to oil, the hydroxyl value of gained polyhydric alcohol integrally presents first to rise and declines afterwards
Variation tendency.When molar ratio of methanol to oil is 6:When the 1st, reacting 90min, hydroxyl value increases to maximum 307.9mgKOH/g, declines afterwards,
After 150min, reaction tends to gentle；And molar ratio of methanol to oil is 4:1、5:1、7:1 and 8:When 1, hydroxyl value in front 150min is in
Ascendant trend, declines after reaching maximum during 150min.Because reaction is reversible reaction, when molar ratio of methanol to oil is less, instead
Answer thing concentration larger, be conducive to the positive direction reacted to carry out, but have pertinent literature to report, when molar ratio of methanol to oil is too high, small molecule
Polyhydric alcohol is excessive, and the dehydration (intramolecular dehydration and intermolecular dehydration) between possible hydroxyl in modifying process forms ehter bond；?
Possibly hydroxyl and the hydrogen on carbon carry out elimination reaction and define double bond, cause hydroxyl value to reduce.If response time mistake
Long, hydroxyl value will be led to reduce with side reactions such as hydroxyls dehydrate.
The impact to product hydroxyl value for 2.2 temperature
Alcoholysis reaction is to form the mixture of a poised state among homogeneous, and its hydroxyl is randomly assigned.But
Carry out so that some products (glycerol) are from molten under the alcoholysis reaction typically peak melting point of each component in higher than mixture
Separate out in liquid, be conducive to reaction to carry out to the direction of product, thus forming the alcoholysis effect of relative orientation.
Fixing molar ratio of methanol to oil is 6:1, at different temperature (170 DEG C, 180 DEG C, 190 DEG C, 200 DEG C, 210 DEG C) carry out
Alcoholysis reaction, reacts the different time (30min, 60min, 90min, 120min, 150min and 180min), reaction temperature is to anti-
Answer the impact of product hydroxyl value as shown in Figure 2.As seen from Figure 2, at different temperatures, with the prolongation product hydroxyl in response time
In downward trend after first rising, alcoholysis reaction product hydroxyl value, at 190 DEG C, reaches highest during reaction 120min, temperature is higher than to value
To occur with side reactions such as hydroxyls dehydrate when 190 DEG C, hydroxyl value has declined.
3. utilize alcoholysis method by the sour fall rate of kitchen waste oil synthesis of polyurethane polyhydric alcohol
The impact to product acid fall rate for 3.1 molar ratio of methanol to oil
Molar ratio of methanol to oil is taken to be 4 respectively:1、5:1、6:1、7:1 and 8:1, each group reaction different time (30min,
60min, 90min, 120min, 150min and 180min), measure the acid number of gained product, acid fall is calculated by formula
Rate.As shown in figure 3, product acid fall rate all increases with the prolongation in response time under the conditions of different molar ratio of methanol to oil, illustrate with
The increase in response time, the acid number of alcoholysis product is reducing always, when alcohol oil rate is 6:When 1, sour fall rate is better than other
Reaction result under conditions of molar ratio of methanol to oil, reaction carries out maximum to fall rate sour during 180min, is 94.64%, acid number also by
159.1mgKOH/g at the beginning drops to 8.52mgKOH/g.With the carrying out of reaction, esterification progressivelyes reach poised state, instead
Answer overlong time can cause the generation of side reaction, not only reduce reaction effect, also can cause the waste of the energy and production efficiency
Decline.
The impact to product acid fall rate for 3.2 temperature
Molar ratio of methanol to oil is taken to be 6:Under the conditions of 1 under different reaction temperatures (170 DEG C, 180 DEG C, 190 DEG C, 200 DEG C, 210
DEG C) reacted, react different time (30min, 60min, 90min, 120min, 150min and 180min), reaction temperature
Impact to product acid fall rate is as shown in Figure 4.As seen from Figure 4, sour fall rate assumes increasing with the increase of reaction temperature
Big trend, illustrates reducing always with the increase acid number of reaction temperature, the reaction 180min acid when reaction temperature is 190 DEG C
Fall rate reaches 95%, and acid number is minimized 7.82mgKOH/g.Consider, esterification is anti-from thermodynamical equilibrium and kinetic reaction speed
Should be an endothermic reaction, raise with reaction temperature, react and carry out to the direction generating ester, in the free fat of 190 DEG C of major parts
Fat acid has been reacted, and reaction trends towards balancing.
Above-mentioned test result indicate that, the optimised process bar of generating polyurethane polyhydric alcohol using alcoholysis method is prepared by kitchen waste oil
Part is：Molar ratio of methanol to oil 6:1,190 DEG C of reaction temperature, response time 90min.
Kitchen waste oil is prepared by generating polyurethane polyhydric alcohol using above-mentioned optimum process condition, reaction measures product after terminating
Hydroxyl value and acid number, product hydroxyl value is 307.9mgKOH/g, and is characterized with infrared, as shown in figure 5, curve above is kitchen
Waste oil infrared spectrum, following curve be alcoholysis product infrared spectrum it can be seen that：Kitchen waste oil and alcoholysis product have substantially phase
As infrared spectrum, wave number 1740.97cm-1And 1709.63cm-1Characteristic absorption peak for ester group C=O；2854.13cm-1With
2923.94cm-1For saturation C-H stretching vibration absworption peak；1460.88cm-1For aromatic ring C=C skeletal vibration absworption peak；
724.75cm-1And 684.70cm-1For alkene C-H out-of-plane bending vibration absworption peak；Compared with initial kitchen waste oil, kitchen is given up
Oil is after alcoholysis reaction in 3317.59cm-1Nearby occur in that wider absworption peak, be the characteristic absorption peak of intermolecular O-H, secondary hydroxyl
Stretching vibration characteristic absorption peak (the 1045.63cm of C-O in base-1、1176.39cm-1And 1108.37cm-1) and locate outside alcohol O-H face
Bending vibration absworption peak (678.31cm-1) there is obvious enhancing, show the increase of hydroxy radical content after alcoholysis reaction.
Claims (10)
1. a kind of utilization alcoholysis method, by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol, comprises the following steps：(1) kitchen is given up
Oil degumming pretreatment；(2) alcoholysis is carried out to kitchen waste oil using the small molecular alcohol of polyfunctionality.
2. utilization alcoholysis method according to claim 1 is by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol, its feature
It is, comprise the following specific steps that：
(1) the useless oil degumming pretreatment of kitchen：Kitchen waste oil is mixed with distilled water, heats and stir, temperature is increased to 60-70
DEG C when, add phosphoric acid, constant temperature continue stirring a period of time, filtered while hot, filtrate is placed in stratification in separatory funnel, discards
Lower floor's waste liquid, is then 6.8-7.2 with the hot wash supernatant liquid of equivalent to pH, the liquid regulating pH is placed in drying baker
Interior drying, obtains final product refined kitchen waste oil；
(2) alcoholysis：Small molecular alcohol by the refined kitchen waste oil obtaining after degumming pretreatment and polyfunctionality is in molar ratio
5.5:1-6.5:It is placed in the four-hole boiling flask with agitating device and thermometer after 1 mixing, will after air in logical nitrogen emptying bottle
Four-hole boiling flask seals, and begins to warm up and does not stop to stir, and rises to temperature and is 185-195 DEG C, adds 0.1-0.2wt% calcium oxide conduct
Catalyst, continues heated at constant temperature 80-100min, obtains the alcoholysis product containing polyurethane polyhydric alcohol.
3. utilization alcoholysis method according to claim 2 is by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol, its feature
It is, the volume ratio that described kitchen waste oil is mixed with distilled water is 2:1-3:1.
4. utilization alcoholysis method according to claim 2 is by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol, its feature
It is, the addition of described phosphoric acid is 0.1-0.2wt%, and phosphoric acid concentration is 85wt%.
5. utilization alcoholysis method according to claim 2 is by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol, its feature
It is, the time that described constant temperature continues stirring is 20-50min.
6. utilization alcoholysis method according to claim 2 is by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol, its feature
It is, described hot water temperature is more than 70 DEG C.
7. utilization alcoholysis method according to claim 2 is by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol, its feature
It is, described drying temperature is 100-120 DEG C, drying time is 2-4h.
8. utilization alcoholysis method according to claim 2 is by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol, its feature
It is, described kitchen waste oil includes frying waste oil, swill oil and waste oil.
9. utilization alcoholysis method according to claim 2 is by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol, its feature
It is, the small molecular alcohol of described polyfunctionality is glycerol.
10. utilization alcoholysis method according to claim 2 is by the method for kitchen waste oil synthesis of polyurethane polyhydric alcohol, its feature
It is, described refined kitchen waste oil is 6 with the mol ratio of the small molecular alcohol of polyfunctionality:1, alcoholysis reaction temperature is 190 DEG C,
The alcoholysis reaction time is 90min, and catalyst amount is 0.13wt%.
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