A device for producing biological base oil and preparation method thereof

Abstract

The invention discloses a device for producing bio-based oil, including a methyl oleate storage tank, an ester exchange reactor, a flash device, an oleic acid polyol ester storage tank, an epoxidation static mixer, an epoxidation reactor, an epoxidation flash device and a filtering device; the methyl oleate storage tank is connected to the top of the ester exchange reactor; a raw material inlet is provided on the ester exchange reactor; the bottom of the ester exchange reactor is connected to the flash device; one end of the oleic acid polyol ester storage tank is connected to the flash device, and the other end is connected to the first input end of the epoxidation reactor; the second input end of the epoxidation reactor is connected to the epoxidation static mixer, and the output end is once connected to the epoxidation flash device and the filtering device. The device is simple and easy to operate in the present invention, and can obtain a production bio-based oil with excellent performance and high yield.

Description

Technical Field

[0001] The present invention relates to the technical field of bio-based oil, and more particularly to a device for producing bio-based oil and a preparation method thereof. Background Art

[0002] The mainstream direction of new energy sources is to use various animal and plant oils to produce lubricant base oils, biodiesel or biosolvent oils. Biolubricant base oils have excellent physical properties, including high flash point, low melting point, and suitable viscosity performance. When preparing various types of lubricants, there is no need for complicated refining processes, such as sulfonation, alkali washing, dewaxing, and pour point reduction of mineral base oils. At the same time, it avoids the discharge of large amounts of wastewater and waste residues to pollute the environment. Therefore, the production of biolubricant base oils provides green raw materials for the production of new lubricants. Similarly, as biodiesel, it is pure in quality and has much lower impurity content such as sulfides than mineral oil. Therefore, it has good ignition performance and complete combustion. It is an excellent fuel, and the exhaust gas it emits SO 2 , He, CO and other contents are very low, which is very beneficial to environmental protection.

[0003] The production process of bio-lubricants is mostly to carry out ester exchange reaction between animal and plant oils and alcohol chemicals (such as methanol, ethanol, etc.) under the action of catalysts, maintaining the required temperature to generate corresponding fatty acid esters. Vegetable oils (such as rapeseed oil, soybean oil, peanut oil, corn oil, cottonseed oil, etc.), animal oils (such as fish oil, lard, tallow, sheep oil, etc.), waste oils or microbial oils are all sources of fatty acids. These inexhaustible gifts from nature are biodegradable, safe and non-toxic, and are clean and environmentally friendly raw materials for the production of synthetic esters.

[0004] However, the current equipment for preparing esters is complex, and there are a series of problems such as high raw material unit consumption and large losses, high energy consumption and long reaction time, unstable reaction zone, low product quality, low yield, etc. Therefore, how to provide a device and preparation method for producing bio-based oils with simple equipment, simple operation, and excellent performance and high yield is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the present invention provides a device and a preparation method for producing bio-based oil which has simple device and simple operation and can obtain a bio-based oil with excellent performance and high yield.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme: a device for producing bio-based oil, comprising a methyl oleate storage tank, an ester exchange reactor, a flash device, an oleic acid polyol ester storage tank, an epoxidation static mixer, an epoxidation reactor, an epoxidation flash device and a filtering device;

[0007] The methyl oleate storage tank is connected to the top of the transesterification reactor;

[0008] The transesterification reaction kettle is provided with a raw material inlet; the bottom end of the transesterification reaction kettle is connected to the flash evaporation device;

[0009] One end of the oleic acid polyol ester storage tank is connected to the flash evaporation device, and the other end is connected to the first input end of the epoxidation reactor;

[0010] The second input end of the epoxidation reaction kettle is connected to the epoxidation static mixer, and the output end is connected to the epoxidation flash device and the filtering device.

[0011] The beneficial effects of the present invention are as follows: the ester exchange reaction kettle and the flash evaporation device are provided in the present invention for preparing oleic acid polyol esters, and no low-boiling substances remain therein, thereby ensuring that the synthesized polyol fatty acid esters can be used at high temperatures; the epoxidation reaction kettle and the epoxidation flash evaporation device are also provided in the present invention for preparing bio-base oil by epoxidation, and the use of the device can ensure the yield and performance of the final product.

[0012] Preferably, the method further comprises: a methyl oleate recovery system, wherein the methyl oleate recovery system is connected to the upper part of the transesterification reactor.

[0013] The beneficial effects of adopting the above technical solution are as follows: the system is set up to recycle methyl oleate and realize green chemistry.

[0014] Preferably, the flash device comprises a flash tank and a flash heater, the input end of the flash heater is respectively connected to the bottom end of the ester exchange reactor and the output end of the flash tank, and the output end is connected to the input end of the flash tank; the output end of the flash tank is also connected to the oleic acid polyol ester storage tank.

[0015] The beneficial effect of adopting the above technical solution is that the above device is set up to ensure that methyl oleate can be completely evaporated and thoroughly removed, thereby ensuring the purity and yield of oleic acid polyol ester and avoiding affecting subsequent steps.

[0016] Preferably, it further comprises: a formic acid storage tank and a hydrogen peroxide storage tank, and the epoxidation static mixer is connected to the formic acid storage tank and the hydrogen peroxide storage tank respectively.

[0017] The beneficial effects of adopting the above technical solution are: controlling the dosage of formic acid and hydrogen peroxide to ensure that the raw materials in the epoxidation static mixer can be supplied to the subsequent reaction steps.

[0018] Preferably, the epoxy flash device comprises an epoxy flash tank and an epoxy flash heater, the input end of the epoxy flash heater is connected to the output end of the epoxidation reactor, and the output end is connected to the input end of the epoxidation flash tank; the output end of the epoxy flash tank is connected to the filtering device.

[0019] Beneficial effects of adopting the above technical solution: the above device is adopted to promote the reaction between oleic acid polyol ester and hydrogen peroxide.

[0020] Preferably, the filtering device comprises a filtering mixing tank, a filter, a filtrate temporary storage tank and a bio-base oil storage tank; a filter inlet is provided at the top of the filtering mixing tank; the input end of the filtering mixing tank is connected to the output end of the epoxy flash tank, and the output end is connected to the filter, the filtrate temporary storage tank and the bio-base oil storage tank in sequence.

[0021] The beneficial effect of adopting the above technical solution is that the filtering device is provided to filter out impurities and obtain a colorless, odorless bio-based oil with a low freezing point.

[0022] Preferably, it also includes: a plurality of circulation pumps, and circulation pumps are provided between the transesterification reactor and the flash heater, between the flash tank and the flash heater, between the epoxidation reactor and the epoxidation flash heater, between the epoxidation flash tank and the epoxidation flash heater, between the filtration mixing tank and the filter, and between the filtrate temporary storage tank and the bio-base oil storage tank.

[0023] Beneficial effects of adopting the above technical solution: The purpose of adopting the circulating pump is to generate power to prompt the material to enter the required device.

[0024] The present invention also provides a method for producing a bio-based oil, characterized in that it comprises the following steps:

[0025] (1) under nitrogen protection, adding polyols into an ester exchange reaction kettle through a raw material inlet and heating to 60-100° C.; after the polyols are dissolved, adding formic acid catalyst and methyl oleate into the ester exchange reaction kettle, and controlling the speed of the ester exchange reaction kettle to be 60-80 r / min, the temperature to be 160-200° C., and reacting for 3-10 hours; then, adding phosphoric acid into the ester exchange reaction kettle to obtain a mixture A; wherein the mass of the formic acid catalyst accounts for 0.1-0.3% of the mass of the methyl oleate, and the mass of the phosphoric acid accounts for 0.05-0.1% of the mass of the methyl oleate;

[0026] (2) Pumping mixed material A into a flash evaporator and heating it at 180-200° C. for 2-3 hours, then stopping the heating and cooling it to obtain oleic acid polyol ester;

[0027] (3) pumping oleic acid polyol ester into the epoxidation reaction kettle, and starting stirring to control the temperature to 60-65° C.; passing formic acid and hydrogen peroxide into the epoxidation reaction kettle through the epoxidation static mixer, and controlling the temperature to 60-65° C. with cooling water, and stirring to obtain a mixture B;

[0028] (4) heating the mixture B to 100-105° C. and pumping it into an epoxy flash evaporator to remove moisture to obtain a mixture C;

[0029] (5) Pumping the mixed material C into a filtering device, stirring, adding a filtering agent and filtering, thereby obtaining the bio-based oil.

[0030] Beneficial effects of the present invention: The process of the present invention is simple, easy to operate, and more suitable for large-scale industrial production.

[0031] Preferably, in step (3), the stirring speed is 60-80 r / min, the mass of the hydrogen peroxide accounts for 25-30% of the mass of the oleic acid polyol ester, and the mass of the formic acid accounts for 2.5-3% of the mass of the oleic acid polyol ester.

[0032] Preferably, in step (4), the filtering agent is a mixture of diatomaceous earth and kaolin, the mass of the kaolin is 0.01-0.05% of the mass of the mixture C, and the mass of the diatomaceous earth is 0.01-0.05% of the mass of the mixture C; the stirring speed is 60-80 r / min, the temperature is 95-105°C; and the filtering time is 0.5-2h.

[0033] The beneficial effects of adopting the above technical solution are: using cheap diatomaceous earth and white clay as filtering agents, achieving good filtering and decolorizing effects, and being able to effectively reduce the cost of the decolorization process.

[0034] It can be seen from the above technical scheme that, compared with the prior art, the present invention discloses a device for producing bio-base oil and a preparation method thereof. The oleic acid polyol ester prepared by the device of the present invention has a light yellow appearance, an acid value of about 0.1-0.3 mgKOH / g, and an oleic acid polyol ester content of more than 98%; and the final finished bio-base oil has the properties of being colorless, odorless, having a high flash point and a low freezing point. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0036] Figure 1The accompanying drawing is a schematic structural diagram of the preparation of oleic acid polyol ester provided by the present invention;

[0037] Figure 2 The accompanying drawing is a schematic structural diagram of the epoxidation reaction provided by the present invention;

[0038] Figure 3 The accompanying drawing is a schematic diagram of the structure of the filtering device provided by the present invention;

[0039] Among them, 1-methyl oleate storage tank, 2-ester exchange reactor, 3-flash device, 4-oleic acid polyol ester storage tank, 5-epoxidation static mixer, 6-epoxidation reactor, 7-epoxy flash device, 8-filtration device, 9-methyl oleate recovery system, 10-formic acid storage tank, 11-hydrogen peroxide storage tank, 12-filtration device, 13-circulation pump I, 14-circulation pump II, 15-circulation pump III, 16-circulation pump IV, 17-circulation pump V, 18-circulation pump VI,

[0040] 21-Raw material import, 31-Flash tank, 32-Flash heater, 61-Sewage system, 71-Epoxy flash tank, 72-Epoxy flash heater, 81-Filtration mixing tank, 82-Filter, 83-Filtrate temporary storage tank, 84-Bio-base oil storage tank, 85-Filter agent import. DETAILED DESCRIPTION

[0041] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Refer to the attached Figure 1-3 As shown, the embodiment of the present invention discloses a device for producing bio-based oil, including a methyl oleate storage tank 1, an ester exchange reactor 2, a flash device 3, an oleic acid polyol ester storage tank 4, an epoxidation static mixer 5, an epoxidation reactor 6, an epoxidation flash device 73 and a filtering device 128;

[0043] The methyl oleate storage tank 1 is connected to the top of the transesterification reactor 2;

[0044] The ester exchange reaction kettle 2 is provided with a raw material inlet 21; the bottom end of the ester exchange reaction kettle 2 is connected to the flash evaporation device 3;

[0045] One end of the oleic acid polyol ester storage tank 4 is connected to the flash evaporation device 3, and the other end is connected to the first input end of the epoxidation reactor 6;

[0046] The second input end of the epoxidation reactor 6 is connected to the epoxidation static mixer 5 , and the output end is connected to the epoxidation flash device 3 and the filtering device 12 .

[0047] In one embodiment, the system further comprises: a methyl oleate recovery system 9 , which is connected to the upper part of the transesterification reactor 2 .

[0048] In one embodiment, the flash device 3 includes a flash tank 31 and a flash heater 32, the input end of the flash heater 32 is connected to the bottom end of the transesterification reactor 2 and the output end of the flash tank 31, and the output end is connected to the input end of the flash tank 31; the output end of the flash tank 31 is also connected to the oleic acid polyol ester storage tank 4. The above device is set to ensure that methyl oleate can be completely evaporated and thoroughly removed, thereby ensuring the purity and yield of oleic acid polyol esters and avoiding affecting subsequent steps.

[0049] In one embodiment, it also includes: a formic acid storage tank 10 and a hydrogen peroxide storage tank 11, and the epoxidation static mixer 5 is respectively connected to the formic acid storage tank 10 and the hydrogen peroxide storage tank 11. The formic acid storage tank 10 and the hydrogen peroxide storage tank 11 are provided to control the amount of formic acid and hydrogen peroxide, so as to ensure that the raw materials in the epoxidation static mixer 5 can be supplied to the subsequent reaction steps.

[0050] In one embodiment, the epoxy flash device 73 includes an epoxy flash tank 71 and an epoxy flash heater 72, the input end of the epoxy flash heater 72 is connected to the output end of the epoxidation reactor 6, and the output end is connected to the input end of the epoxidation flash tank 31; the output end of the epoxy flash tank 71 is connected to the filter device 12. The above device is used to promote the reaction between oleic acid polyol ester and hydrogen peroxide. A sewage system 61 is also set at the bottom of the epoxidation reactor 6, which is used to discharge the sewage of the epoxidation reactor 6 into the sewage system 61 for treatment to avoid environmental pollution.

[0051] In one embodiment, the filter device 12 includes a filter mixing tank 81, a filter 82, a filtrate temporary storage tank 83 and a bio-based oil storage tank 84; a filter inlet 85 is provided at the top of the filter mixing tank 81; the input end of the filter mixing tank 81 is connected to the output end of the epoxy flash tank 71, and the output end is sequentially connected to the filter 82, the filtrate temporary storage tank 83 and the bio-based oil storage tank 84. The filter device 12 is provided to filter out impurities and obtain a colorless, odorless and low-condensation-point bio-based oil.

[0052] In one embodiment, it also includes: multiple circulation pumps, and circulation pumps are provided between the transesterification reactor 2 and the flash heater 32, between the flash tank 31 and the flash heater 32, between the epoxidation reactor 6 and the epoxidation flash heater 72, between the epoxidation flash tank 31 and the epoxidation flash heater 72, between the filtration mixing tank 81 and the filter 82, and between the filtrate temporary storage tank 83 and the bio-base oil storage tank 84. The purpose of using the circulation pump is to generate power to promote the material to enter the required device.

[0053] Example 1

[0054] The method for producing bio-based oil using the above device comprises the following steps:

[0055] (1) Under nitrogen protection, polyol is added into the transesterification reactor 2 through the raw material inlet 21 and heated to 60° C.; after the polyol is dissolved, formic acid catalyst and methyl oleate are added into the transesterification reactor 2, and the speed of the transesterification reactor 2 is controlled to be 60 r / min, the temperature is controlled to be 160° C., and the reaction is carried out for 3 hours; then, phosphoric acid is added into the transesterification reactor 2 and the pH value of the transesterification reactor 2 is controlled to be 7; a mixture A is obtained; wherein the mass of the formic acid catalyst accounts for 0.1% of the mass of the methyl oleate, and the mass of the phosphoric acid accounts for 0.05% of the mass of the methyl oleate;

[0056] (2) The mixed material A is pumped into the flash tank 31 via the circulation pump I 13 and heated at 180° C. for 2 h, and then the heating is stopped and the temperature is lowered to 80° C. to obtain oleic acid polyol ester, which is pumped into the oleic acid polyol ester storage tank 4 via the circulation pump II 14 for standby use; the content of oleic acid polyol ester is 99.2%;

[0057] (3) Pumping oleic acid polyol ester into the epoxidation reactor 6, and starting stirring to control the temperature to 60° C.; pumping formic acid in the formic acid storage tank 10 and hydrogen peroxide in the hydrogen peroxide storage tank 11 into the epoxidation reactor 6 through the epoxidation static mixer 5, and controlling the temperature of the epoxidation reactor 6 at 60° C. with cooling water, stirring at a speed of 60 r / min, and keeping the temperature for 5 hours to obtain a mixture B; letting it stand for 2 hours, and then pumping the remaining hydrogen peroxide and formic acid into the sewage system 61 for treatment and discharge; wherein the mass of hydrogen peroxide accounts for 25% of the mass of oleic acid polyol ester, and the mass of formic acid accounts for 2.5% of the mass of oleic acid polyol ester.

[0058] (4) The vacuum degree of the epoxidation reactor 6 is controlled to be (-0.1) MPa, and the mixture B in the epoxidation reactor 6 is heated to 100° C., and then pumped into the epoxy flash tank 71 through the circulation pump III 15, and the moisture is removed from the epoxy flash through the epoxy flash heater 72 to obtain a mixture C; (5) The mixture C is pumped into the filtration mixing tank 81 through the circulation pump IV 16, and stirred at a speed of 60 r / min, and then kaolin and diatomaceous earth are added into the filtration mixing tank 81 through the filter inlet 85, and stirred at 95° C. and 60 r / min for adsorption reaction for 0.5 h, and then the material is pumped into the filter 82 through the circulation pump V 17, and the obtained product enters the filtrate temporary storage tank 83, and then pumped into the bio-base oil storage tank 84 through the circulation pump VI 18; wherein the mass of the kaolin is 0.01% of the mass of the mixture C, and the mass of the diatomaceous earth is 0.01% of the mass of the mixture C.

[0059] Example 2

[0060] The method for producing bio-based oil using the above device comprises the following steps:

[0061] (1) Under nitrogen protection, polyol is added into the transesterification reactor 2 through the raw material inlet 21 and heated to 100° C.; after the polyol is dissolved, formic acid catalyst and methyl oleate are added into the transesterification reactor 2, and the speed of the transesterification reactor 2 is controlled to be 80 r / min, the temperature is controlled to be 180° C., and the reaction is carried out for 10 hours; then, phosphoric acid is added into the transesterification reactor 2 and the pH value of the transesterification reactor 2 is controlled to be 7; a mixture A is obtained; wherein the mass of the formic acid catalyst accounts for 0.3% of the mass of the methyl oleate, and the mass of the phosphoric acid accounts for 0.1% of the mass of the methyl oleate;

[0062] (2) The mixed material A is pumped into the flash tank 31 via the circulation pump I 13 and heated at 200° C. for 3 h, then the heating is stopped and the temperature is lowered to 80° C. to obtain oleic acid polyol ester, which is pumped into the oleic acid polyol ester storage tank 4 via the circulation pump II 14 for standby use; the content of oleic acid polyol ester is 99.6%;

[0063] (3) Pumping oleic acid polyol ester into the epoxidation reactor 6, and starting stirring to control the temperature to 65° C.; pumping formic acid in the formic acid storage tank 10 and hydrogen peroxide in the hydrogen peroxide storage tank 11 into the epoxidation reactor 6 through the epoxidation static mixer 5, and controlling the temperature of the epoxidation reactor 6 at 65° C. with cooling water, stirring at a speed of 80 r / min, and keeping the temperature for 8 hours to obtain a mixture B; letting it stand for 2 hours, and then pumping the remaining hydrogen peroxide and formic acid into the sewage system 61 for treatment and discharge; wherein the mass of hydrogen peroxide accounts for 30% of the mass of oleic acid polyol ester, and the mass of formic acid accounts for 3% of the mass of oleic acid polyol ester.

[0064] (4) The vacuum degree of the epoxidation reactor 6 is controlled to be (-0.1) MPa, and the mixture B in the epoxidation reactor 6 is heated to 105° C., and then pumped into the epoxy flash tank 71 through the circulation pump III 15, and the moisture is removed from the epoxy flash through the epoxy flash heater 72 to obtain a mixture C; (5) The mixture C is pumped into the filtration mixing tank 81 through the circulation pump IV 16, and stirred at a speed of 80 r / min, and then kaolin and diatomaceous earth are added into the filtration mixing tank 81 through the filter inlet 85, and stirred at 105° C. and 80 r / min for adsorption reaction for 2 hours, and then the material is pumped into the filter 82 through the circulation pump V 17, and the obtained product enters the filtrate temporary storage tank 83, and then pumped into the bio-base oil storage tank 84 through the circulation pump VI 18; wherein the mass of the kaolin is 0.05% of the mass of the mixture C, and the mass of the diatomaceous earth is 0.05% of the mass of the mixture C.

[0065] Example 3

[0066] The method for producing bio-based oil using the above device comprises the following steps:

[0067] (1) Under nitrogen protection, polyol is added into the transesterification reactor 2 through the raw material inlet 21 and heated to 80° C.; after the polyol is dissolved, formic acid catalyst and methyl oleate are added into the transesterification reactor 2, and the speed of the transesterification reactor 2 is controlled to be 70 r / min, the temperature is controlled to be 200° C., and the reaction is carried out for 6 hours; then, phosphoric acid is added into the transesterification reactor 2 and the pH value of the transesterification reactor 2 is controlled to be 7; a mixture A is obtained; wherein the mass of the formic acid catalyst accounts for 0.2% of the mass of the methyl oleate, and the mass of the phosphoric acid accounts for 0.08% of the mass of the methyl oleate;

[0068] (2) The mixed material A is pumped into the flash tank 31 via the circulation pump I 13, and heated at 190° C. for 2.5 h, and then the heating is stopped and the temperature is lowered to 80° C. to obtain oleic acid polyol ester, which is pumped into the oleic acid polyol ester storage tank 4 via the circulation pump II 14 for standby use; the content of oleic acid polyol ester is 99.5%;

[0069] (3) Pumping oleic acid polyol ester into the epoxidation reactor 6, and starting stirring to control the temperature to 60° C.; pumping formic acid in the formic acid storage tank 10 and hydrogen peroxide in the hydrogen peroxide storage tank 11 into the epoxidation reactor 6 through the epoxidation static mixer 5, and controlling the temperature of the epoxidation reactor 6 at 60° C. with cooling water, stirring at a speed of 70 r / min, and keeping the temperature for 7 hours to obtain a mixture B; letting it stand for 2 hours, and then pumping the remaining hydrogen peroxide and formic acid into the sewage system 61 for treatment and discharge; wherein the mass of hydrogen peroxide accounts for 28% of the mass of oleic acid polyol ester, and the mass of formic acid accounts for 2.5% of the mass of oleic acid polyol ester.

[0070] (4) The vacuum degree of the epoxidation reactor 6 is controlled to be (-0.1) MPa, and the mixture B in the epoxidation reactor 6 is heated to 102° C., and then pumped into the epoxy flash tank 71 through the circulation pump III 15, and the moisture is removed from the epoxy flash through the epoxy flash heater 72 to obtain a mixture C; (5) The mixture C is pumped into the filtration mixing tank 81 through the circulation pump IV 16, and stirred at a speed of 60 r / min, and then kaolin and diatomaceous earth are added into the filtration mixing tank 81 through the filter inlet 85, and stirred at 100° C. and 60 r / min for adsorption reaction for 1.2 hours, and then the material is pumped into the filter 82 through the circulation pump V 17, and the obtained product enters the filtrate temporary storage tank 83, and then pumped into the bio-base oil storage tank 84 through the circulation pump VI 18; wherein the mass of the kaolin is 0.03% of the mass of the mixture C, and the mass of the diatomaceous earth is 0.03% of the mass of the mixture C.

[0071] Performance Testing

[0072] According to the national standard GB / T 20828-2015, the properties of the bio-based oils obtained in Examples 1-3 of the present invention were measured, and the result data are shown in Table 1:

[0073] Performance results of the bio-based oils of Examples 1-3

[0074]

[0075] As shown in Table 1, the bio-based oil obtained by the device and method of the present invention has the characteristics of high flash point, low pour point, and degradability, so that its comprehensive performance is outstanding. Bio-based base oil has a very wide range of applications in aviation, wind power, automobile, mechanical processing, transportation, metallurgy, coal, construction, light industry and other industries. Bio-based base oil is becoming more and more popular. It has the incomparable characteristics of mineral base oil, that is, it can be biodegraded and quickly reduce environmental pollution.

[0076] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for producing a bio-based oil, characterized in that: The following steps are involved: (1) under nitrogen protection, adding polyols into an ester exchange reaction kettle through a raw material inlet and heating to 60-100° C.; after the polyols are dissolved, adding formic acid catalyst and methyl oleate into the ester exchange reaction kettle, and controlling the speed of the ester exchange reaction kettle to be 60-80 r / min, the temperature to be 160-200° C., and reacting for 3-10 hours; then, adding phosphoric acid into the ester exchange reaction kettle to obtain a mixture A; wherein the mass of the formic acid catalyst accounts for 0.1-0.3% of the mass of the methyl oleate, and the mass of the phosphoric acid accounts for 0.05-0.1% of the mass of the methyl oleate; (2) Pumping mixed material A into a flash evaporator and heating it at 180-200° C. for 2-3 hours, then stopping the heating and cooling it to obtain oleic acid polyol ester; (3) pumping oleic acid polyol ester into the epoxidation reaction kettle, and starting stirring to control the temperature to 60-65° C.; passing formic acid and hydrogen peroxide into the epoxidation reaction kettle through the epoxidation static mixer, and controlling the temperature to 60-65° C. with cooling water, and stirring to obtain a mixture B; (4) heating the mixture B to 100-105° C. and pumping it into an epoxy flash evaporator to remove moisture to obtain a mixture C; (5) pumping the mixed material C into a filtering device, stirring, adding a filtering agent and filtering to obtain the bio-based oil; The device used in the above-mentioned method for producing bio-based oil includes a methyl oleate storage tank, an ester exchange reactor, a flash device, an oleic acid polyol ester storage tank, an epoxidation static mixer, an epoxidation reactor, an epoxidation flash device and a filtering device; The methyl oleate storage tank is connected to the top of the transesterification reactor; The transesterification reaction kettle is provided with a raw material inlet; the bottom end of the transesterification reaction kettle is connected to the flash evaporation device; One end of the oleic acid polyol ester storage tank is connected to the flash evaporation device, and the other end is connected to the first input end of the epoxidation reactor; The second input end of the epoxidation reaction kettle is connected to the epoxidation static mixer, and the output end is connected to the epoxy flash device and the filtering device in sequence.

2. A method for producing a bio-based oil according to claim 1, characterized in that: In step (3), the stirring speed is 60-80 r / min, the mass of the hydrogen peroxide accounts for 25-30% of the mass of the oleic acid polyol ester, and the mass of the formic acid accounts for 2.5-3% of the mass of the oleic acid polyol ester.

3. A method for producing a bio-based oil according to claim 1, characterized in that: In step (5), the filtering agent is a mixture of diatomaceous earth and kaolin, the mass of the diatomaceous earth is 0.01-0.05% of the mass of the mixture C, and the mass of the kaolin is 0.01-0.05% of the mass of the mixture C; the stirring speed is 60-80 r / min, the temperature is 95-105°C; and the filtering time is 0.5-2h.

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