CN113563976A - Gas-phase esterification system of waste grease and method for treating waste grease - Google Patents
Gas-phase esterification system of waste grease and method for treating waste grease Download PDFInfo
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- CN113563976A CN113563976A CN202110823574.9A CN202110823574A CN113563976A CN 113563976 A CN113563976 A CN 113563976A CN 202110823574 A CN202110823574 A CN 202110823574A CN 113563976 A CN113563976 A CN 113563976A
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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
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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
- 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
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Abstract
The invention discloses a gas-phase esterification system of waste grease and a method for treating the waste grease by using the same, and belongs to the technical field of biodiesel. The gas phase esterification system comprises a methanol tank, a third-stage esterification reaction tower, a second-stage esterification reaction tower, a first-stage esterification reaction tower and a waste grease tank which are sequentially communicated; the device also comprises a sulfuric acid tank which is respectively communicated with the third-stage esterification reaction tower, the second-stage esterification reaction tower and the first-stage esterification reaction tower. The method comprises the steps of carrying out primary esterification reaction on sulfuric acid, methanol and waste oil in a primary esterification reaction tower at the temperature of 115 ℃ and 125 ℃ to generate primary esterified oil; carrying out a secondary esterification reaction on the primary esterified oil, methanol and sulfuric acid in a secondary esterification reaction tower to generate secondary esterified oil; the second-level esterified oil, methanol and sulfuric acid react in a third-level esterification reaction tower at the temperature of 115 ℃ and 125 ℃ to generate third-level esterified oil. The system can greatly reduce the addition of sulfuric acid and the acid value of the esterified oil can be reduced to 0.53 KOH/(mg/g).
Description
Technical Field
The invention relates to the technical field of biodiesel, in particular to a gas-phase esterification system of waste grease and a method for treating the waste grease.
Background
The sulfuric acid gas phase esterification catalyst has the problems of large dosage, high energy consumption and low production efficiency in the esterification reaction process. The dosage of the sulfuric acid for gas phase esterification of the sulfuric acid catalyzed methanol at 120 ℃ is generally between 0.5 and 0.7 percent, a plurality of problems are brought to subsequent processing due to the problem of large catalyst dosage, and the acid value is difficult to be reduced below 1KOH/(mg/g) due to the large dosage of the methanol.
Disclosure of Invention
In order to solve the technical problem, the method of metering and adding the sulfuric acid catalyst in stages is adopted to achieve the purpose of greatly reducing the dosage of the catalyst.
The invention aims to overcome the technical defects and provides a gas phase esterification system of waste oil and a method for treating the waste oil by using the gas phase esterification system, which solves the technical problems that the use amount of sulfuric acid and methanol is large and the acid value is difficult to be reduced below 1KOH/(mg/g) in the prior art.
In order to achieve the technical purpose, the invention provides a gas phase esterification system of waste oil and a method for treating the waste oil by using the same.
The invention provides a gas-phase esterification system for waste oil, which comprises a methanol tank, a three-stage esterification reaction tower, a two-stage esterification reaction tower, a first-stage esterification reaction tower and a waste oil tank which are sequentially communicated; the discharge end of the methanol tank is communicated with the third-stage esterification reaction tower, and the discharge end of the waste grease tank is communicated with the first-stage esterification reaction tower;
the device also comprises a sulfuric acid tank, wherein the discharge end of the sulfuric acid tank is communicated with the third-stage esterification reaction tower, the second-stage esterification reaction tower and the first-stage esterification reaction tower respectively.
Further, the device also comprises a first pipeline, a second pipeline, a third pipeline and a fourth pipeline; the discharge end of the methanol tank is communicated with the bottom of the third-stage esterification reaction tower through the first pipeline; a discharge hole at the top of the third esterification tower is communicated with a feed inlet at the bottom of the second esterification reaction tower through the second pipeline; a discharge hole at the top of the secondary esterification tower is communicated with a feed inlet at the bottom of the primary esterification tower through the third pipeline; and the discharge hole of the waste grease tank is communicated with the top feed inlet of the primary esterification reaction tower through the fourth pipeline.
The first oil pump is used for conveying the first-stage esterified oil in the first-stage esterification reaction tower to the second-stage esterification reaction tower.
The feeding end of the second oil pump is communicated with the bottom of the second-stage esterification reaction tower, the discharging end of the second oil pump is communicated with the top of the third-stage esterification reaction tower, and the second oil pump is used for conveying the second-stage esterified oil in the second-stage esterification reaction tower into the third-stage esterification reaction tower.
And further, the device also comprises a methanol distillation tower, wherein a feed inlet at the bottom of the methanol distillation tower is connected with the top of the primary esterification reaction tower, and the methanol distillation tower is used for purifying the methanol after the primary esterification reaction.
Further, still include the methanol and keep in the jar, the feed end of methanol jar of keeping in with the methanol distillation tower intercommunication, the methanol jar of keeping in is used for the methanol after the storage purification.
Further, the device also comprises a first heater, wherein the feeding end of the first heater is communicated with the waste grease tank, the discharging end of the first heater is communicated with the third-stage esterification reaction tower, and the first heater is used for heating waste grease.
And the feeding end of the second heater is communicated with the methanol tank, the discharging end of the second heater is communicated with the third-stage esterification reaction tower, and the second heater is used for heating methanol.
Further, the first-stage esterification reaction tower, the second-stage esterification reaction tower or the third-stage esterification reaction tower comprises a tower body, a first distributor and a second distributor; the first distributor is arranged at the bottom in the tower body, the second distributor is arranged at the top in the tower body, the first distributor is used for distributing methanol, and the second distributor is used for distributing waste grease or esterified oil.
In addition, the invention also provides a method for treating the waste oil by the gas-phase esterification system of the waste oil, which comprises the following steps:
carrying out primary esterification reaction on sulfuric acid, methanol and waste oil in a primary esterification reaction tower at the temperature of 115 ℃ and 125 ℃ to generate primary esterified oil;
the first-stage esterified oil, methanol and sulfuric acid are subjected to a second-stage esterification reaction in a second-stage esterification reaction tower at the temperature of 115 ℃ and 125 ℃ to generate second-stage esterified oil;
and the secondary esterified oil, methanol and sulfuric acid react in a tertiary esterification reaction tower at the temperature of 115-125 ℃ to generate tertiary esterified oil.
Compared with the prior art, the invention has the beneficial effects that: the methanol tank, the third-stage esterification reaction tower, the second-stage esterification reaction tower, the first-stage esterification reaction tower and the waste oil tank are sequentially communicated, methanol in the methanol tank enters the third-stage esterification reaction tower, the waste oil tank enters the first-stage esterification reaction tower, the methanol preferentially participates in the third-stage esterification reaction, then participates in the second-stage esterification reaction, and finally participates in the first-stage esterification reaction, the initial waste oil and the methanol are subjected to esterification reaction under the catalysis of sulfuric acid to generate first-stage esterified oil, the first-stage esterified oil enters the second-stage esterification reaction tower and is subjected to esterification reaction with the methanol under the action of sulfuric acid to generate second-stage esterified oil, the second-stage esterified oil enters the third-stage esterification reaction tower and is subjected to esterification reaction under the action of sulfuric acid to generate third-stage esterified oil, the acid value of the esterified oil is continuously reduced, the requirement on the methanol is higher, so that the requirement of the esterification reaction on the methanol is met by adopting a methanol reverse reaction, methanol is efficiently utilized, the reaction is coherent, the esterification efficiency is improved, in addition, sulfuric acid enters three esterification reaction towers in sections respectively, corresponding sulfuric acid is added according to the acid value, the addition amount of the sulfuric acid is greatly reduced, the addition amount of the sulfuric acid can be reduced to about 0.3 percent, and the acid value of the esterified oil can be reduced to 0.53 KOH/(mg/g).
Drawings
FIG. 1 is a schematic view of a gas-phase esterification system for waste fats and oils according to example 1 of the present invention.
FIG. 2 is a schematic diagram showing the structure of a first-stage esterification reaction column in example 1 of the present invention.
Description of reference numerals: 1. a methanol tank; 2. a third-stage esterification reaction tower; 3. a secondary esterification reaction tower; 4. a first-stage esterification reaction tower; 41. a tower body; 42. a first distributor; 43. a second distributor; 5. a waste grease tank; 6. a sulfuric acid tank; 7. a metering pump; 8. a first conduit; 9. a second conduit; 10. a third pipeline; 11. a fourth conduit; 12. a first oil pump; 13. a second oil pump; 14. a methanol distillation column; 15. a methanol temporary storage tank; 16. a first heater; 161. a first U-shaped heat exchanger; 162. a second U-shaped heat exchanger; 17. a second heater; 18. a plate condenser.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
With reference to fig. 1-2, the present embodiment provides a gas phase esterification system for waste oil, including a methanol tank 1, a third-stage esterification reaction tower 2, a second-stage esterification reaction tower 3, a first-stage esterification reaction tower 4, and a waste oil tank 5, which are sequentially communicated; the discharge end of the methanol tank 1 is communicated with the third-stage esterification reaction tower 2, and the discharge end of the waste grease tank 5 is communicated with the first-stage esterification reaction tower 4;
the device also comprises a sulfuric acid tank 6, wherein the discharge end of the sulfuric acid tank 6 is respectively communicated with the third-stage esterification reaction tower 2, the second-stage esterification reaction tower 3 and the first-stage esterification reaction tower 4.
Further, a sulfuric acid tank 6 is respectively communicated with the tops of the third-stage esterification reaction tower 2, the second-stage esterification reaction tower 3 and the first-stage esterification reaction tower 4 through a metering pump 7.
On the basis of the above embodiment, the present embodiment further includes a first duct 8, a second duct 9, a third duct 10, and a fourth duct 11; the discharge end of the methanol tank 1 is communicated with the bottom of the third-stage esterification reaction tower 2 through a first pipeline 8; a discharge port at the top of the third esterification tower is communicated with a feed port at the bottom of the second esterification reaction tower 3 through a second pipeline 9; a discharge port at the top of the second-stage esterification reaction tower 3 is communicated with a feed port at the bottom of the first-stage esterification reaction tower 4 through a third pipeline 10; the discharge hole of the waste grease tank 5 is communicated with the top feed inlet of the first-stage esterification reaction tower 4 through a fourth pipeline 11. The bottom of the gas-phase methanol entering each esterification reaction tower can be fully contacted with reactants in the esterification reaction tower, the waste grease tank 5 and the sulfuric acid enter from the top of the primary esterification reaction tower 4 together and can be fully contacted with the gas-phase methanol which flows upwards from the bottom in the primary esterification reaction tower 4, and the efficiency of the primary esterification reaction is favorably improved.
On the basis of the above embodiment, the present embodiment further includes a first oil pump 12, a feed end of the first oil pump 12 is communicated with the bottom of the first-stage esterification reaction tower 4, a discharge end of the first oil pump 12 is communicated with the top of the second-stage esterification reaction tower 3, and the first oil pump 12 is configured to convey the first-stage esterified oil in the first-stage esterification reaction tower 4 to the second-stage esterification reaction tower 3. First oil pump 12 exports first-order esterified oil from the bottom of first-order esterification reaction tower 4, later imports from the top of second grade esterification reaction tower 3, is favorable to the abundant contact of first-order esterified oil and gaseous phase methyl alcohol, and then improves second grade esterification reaction's efficiency.
On the basis of the above embodiment, the present embodiment further includes a second oil pump 13, a feeding end of the second oil pump 13 is communicated with the bottom of the second-stage esterification reaction tower 3, a discharging end of the second oil pump 13 is connected with the top of the third-stage esterification reaction tower 2, and the second oil pump 13 is configured to convey the second-stage esterified oil in the second-stage esterification reaction tower 3 to the third-stage esterification reaction tower 2. Is beneficial to the full contact of the second-level esterified oil and the gas-phase methanol, thereby improving the efficiency of the third-level esterification reaction.
On the basis of the above embodiment, the present embodiment further includes a methanol distillation tower 14, a bottom feed inlet of the methanol distillation tower 14 is connected to the top of the first-order esterification reaction tower 4, and the methanol distillation tower 14 is used for purifying methanol after the first-order esterification reaction. The methanol reacted in the first esterification reaction tower 4 overflows from the top opening of the first esterification reaction tower and enters a methanol distillation tower 14 to be purified to obtain the methanol.
On the basis of the above embodiment, this embodiment further includes a methanol temporary storage tank 15, the feed end of the methanol temporary storage tank 15 is communicated with the methanol distillation tower 14, and the methanol temporary storage tank 15 is used for storing the purified methanol.
On the basis of the above embodiment, the present embodiment further includes a first heater 16, a feed end of the first heater 16 is communicated with the waste grease tank 5, a discharge end of the first heater 16 is communicated with the third-stage esterification reaction tower 2, and the first heater 16 is used for heating the waste grease. The first heater 16 heats the waste grease to reach 115-125 ℃ required by the esterification reaction. Further, the first heater 16 of the present embodiment includes a first U-shaped heat exchanger 161 and a second U-shaped heat exchanger 162, the waste grease tank 5 is communicated with the first U-shaped heat exchanger 161, the first U-shaped heat exchanger 161 is communicated with the second U-shaped heat exchanger 162, and the second U-shaped heat exchanger 162 is communicated with the third esterification reaction tower.
On the basis of the above embodiment, the present embodiment further comprises a second heater 17, wherein a feed end of the second heater 17 is communicated with the methanol tank 1, a discharge end of the second heater 17 is communicated with the third-stage esterification reaction tower 2, and the second heater 17 is used for heating methanol. The second heater 17 heats the methanol to form gas-phase methanol, and the gas-phase methanol is introduced into the third-stage esterification reaction tower 2.
On the basis of the above embodiment, in this embodiment, the first-stage esterification reaction tower 4, the second-stage esterification reaction tower 3, or the third-stage esterification reaction tower 2 includes a tower body 41, a first distributor 42, and a second distributor 43; the first distributor 42 is arranged at the bottom in the tower body 41, the second distributor 43 is arranged at the top in the tower body 41, the first distributor 42 is used for distributing methanol, and the second distributor 43 is used for distributing waste grease or esterified oil. Further, the first distributor 42 and the second distributor 43 are corrosion-resistant polyvinylidene fluoride distributors, the pore diameter of the first distributor 42 is 0.5-1.5mm, preferably 0.6-1.2mm, more preferably 0.9-1.1mm, and the pore diameter of the first distributor 43 is 2.0-5.0mm, preferably 2.5-4.0mm, more preferably 3.0-3.2 mm.
On the basis of the above embodiments, the system in this embodiment further includes a plate condenser 18, where the plate condenser 18 is used to control the temperature of the whole system, and the device is a device commonly used in the art and will not be described herein again.
In addition, a pump is usually arranged between the devices in the whole system for convenient transportation, which is shown in fig. 1, and the design of the pump belongs to the devices commonly used in the field, so that the detailed description is omitted, and a plurality of switch valves are correspondingly arranged.
In addition, the embodiment also includes a method for processing waste grease by the gas phase esterification system of waste grease, which includes the following steps:
sulfuric acid, methanol and waste oil are subjected to primary esterification reaction in a primary esterification reaction tower 4 at the temperature of 115 ℃ and 125 ℃ to generate primary esterified oil; the reaction time is 60 to 120 minutes, preferably 70 to 110 minutes, and more preferably 90 to 100 minutes;
the first-stage esterified oil, methanol and sulfuric acid are subjected to a second-stage esterification reaction in a second-stage esterification reaction tower 3 at the temperature of 115 ℃ and 125 ℃ to generate second-stage esterified oil; the time of the secondary esterification reaction is 60 to 120 minutes, preferably 70 to 110 minutes, and more preferably 90 to 100 minutes;
the secondary esterified oil, methanol and sulfuric acid react in a tertiary esterification reaction tower 2 at the temperature of 115 ℃ and 125 ℃ to generate tertiary esterified oil; the time of the tertiary esterification reaction is 90-150 minutes, preferably 100-130 minutes, and more preferably 110-120 minutes.
The ratio of the methanol steam (gas phase methanol) dosage to the grease with specific acid value is generally 5-15%, the dosage is smaller when the acid value is lower, and conversely, the dosage is larger when the acid value is higher. The relationship between the amount of methanol used and the acid value is shown in Table 1 below.
TABLE 1 amount of methanol for oils with different acid value
| Acid value of oil (KOH/(mg/g)) | Amount of methanol (%) |
| 20 | 7 |
| 40 | 8 |
| 60 | 9 |
| 80 | 10 |
| 100 | 11 |
| 120 | 12 |
| 140 | 13 |
| 160 | 14 |
| 180 | 15 |
And (4) related tests:
by adopting the system in the embodiment, the waste oil with different acid values is not favorable, the reaction temperature in the three esterification reaction towers is 122 ℃, the time of the first-stage esterification reaction is 90 minutes, the time of the second-stage esterification reaction is 90 minutes, the time of the third-stage esterification reaction is 120 minutes, and the use amounts of sulfuric acid and methanol and the acid value of the third-stage esterified oil are shown in table 2.
TABLE 2 results of the systematic treatment of waste oils and fats of different acid value
As can be seen from Table 2, the acid value of the waste oil treated by the system can be reduced to 0.53KOH/(mg/g), the dosage of the sulfuric acid is less than 0.3 percent, the dosage of the methanol is 7 to 12 percent, and the dosages of the methanol and the sulfuric acid are less.
And (3) comparison test:
the results of treating the waste oils and fats in the above test with acid value reduction treatment only in the three-stage esterification reaction tower at 122 ℃ for 8 hours are shown in Table 3.
TABLE 3 results of treating waste oils and fats by three-stage esterification reaction tower
As can be seen from Table 3, when only three esterification towers are used to treat waste oil, the use amounts of sulfuric acid and methanol are high, and the acid value cannot be reduced below 1KOH/(mg/g) after 8 hours of esterification reaction.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A gas phase esterification system of waste oil is characterized by comprising a methanol tank, a third-stage esterification reaction tower, a second-stage esterification reaction tower, a first-stage esterification reaction tower and a waste oil tank which are sequentially communicated; the discharge end of the methanol tank is communicated with the third-stage esterification reaction tower, and the discharge end of the waste grease tank is communicated with the first-stage esterification reaction tower;
the device also comprises a sulfuric acid tank, wherein the discharge end of the sulfuric acid tank is communicated with the third-stage esterification reaction tower, the second-stage esterification reaction tower and the first-stage esterification reaction tower respectively.
2. The gas-phase esterification system of waste fats and oils according to claim 1, further comprising a first pipe, a second pipe, a third pipe and a fourth pipe; the discharge end of the methanol tank is communicated with the bottom of the third-stage esterification reaction tower through the first pipeline; a discharge hole at the top of the third esterification tower is communicated with a feed inlet at the bottom of the second esterification reaction tower through the second pipeline; a discharge hole at the top of the secondary esterification tower is communicated with a feed inlet at the bottom of the primary esterification tower through the third pipeline; and the discharge hole of the waste grease tank is communicated with the top feed inlet of the primary esterification reaction tower through the fourth pipeline.
3. The gas-phase esterification system of waste grease of claim 1, further comprising a first oil pump, wherein a feed end of the first oil pump is communicated with the bottom of the first-stage esterification reaction tower, a discharge end of the first oil pump is communicated with the top of the second-stage esterification reaction tower, and the first oil pump is used for conveying the first-stage esterified oil in the first-stage esterification reaction tower into the second-stage esterification reaction tower.
4. The gas-phase esterification system for waste grease of claim 1, further comprising a second oil pump, wherein a feed end of the second oil pump is communicated with the bottom of the second-stage esterification reaction tower, a discharge end of the second oil pump is communicated with the top of the third-stage esterification reaction tower, and the second oil pump is used for conveying the second-stage esterified oil in the second-stage esterification reaction tower into the third-stage esterification reaction tower.
5. The gas-phase esterification system of waste oils and fats according to claim 1, further comprising a methanol distillation tower, wherein a bottom feed inlet of the methanol distillation tower is connected to the top of the primary esterification reaction tower, and the methanol distillation tower is used for purifying the methanol after the primary esterification reaction.
6. The gas phase esterification system for waste oil and fat as claimed in claim 5, further comprising a methanol temporary storage tank, wherein the feed end of the methanol temporary storage tank is communicated with the methanol distillation tower, and the methanol temporary storage tank is used for storing purified methanol.
7. The gas-phase esterification system for waste grease of claim 1, further comprising a first heater, wherein the feed end of the first heater is communicated with the waste grease tank, the discharge end of the first heater is communicated with the tertiary esterification reaction tower, and the first heater is used for heating the waste grease.
8. The gas-phase esterification system for waste oil and fat according to claim 1, further comprising a second heater, wherein a feed end of the second heater is communicated with the methanol tank, a discharge end of the second heater is communicated with the third-stage esterification reaction tower, and the second heater is used for heating methanol.
9. The gas-phase esterification system of waste fats and oils according to claim 1, wherein the first-stage esterification reaction tower, the second-stage esterification reaction tower, or the third-stage esterification reaction tower comprises a tower body, a first distributor, and a second distributor; the first distributor is arranged at the bottom in the tower body, the second distributor is arranged at the top in the tower body, the first distributor is used for distributing methanol, and the second distributor is used for distributing waste grease or esterified oil.
10. A method for treating waste oil and fat in a gas phase esterification system of waste oil and fat according to any one of claims 1 to 9, comprising the steps of:
carrying out primary esterification reaction on sulfuric acid, methanol and waste oil in a primary esterification reaction tower at the temperature of 115 ℃ and 125 ℃ to generate primary esterified oil;
the first-stage esterified oil, methanol and sulfuric acid are subjected to a second-stage esterification reaction in a second-stage esterification reaction tower at the temperature of 115 ℃ and 125 ℃ to generate second-stage esterified oil;
and the secondary esterified oil, methanol and sulfuric acid react in a tertiary esterification reaction tower at the temperature of 115-125 ℃ to generate tertiary esterified oil.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114634843A (en) * | 2022-04-07 | 2022-06-17 | 湖北天基生物能源科技发展有限公司 | Method for esterification reaction of swill-cooked dirty oil and subcritical gaseous methanol |
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| WO2003042343A1 (en) * | 2001-11-16 | 2003-05-22 | Gapes Richard J | Esterification of fatty acids in oil |
| CN105586154A (en) * | 2015-12-31 | 2016-05-18 | 陕西合盛生物柴油技术开发有限公司 | Continuous esterification method for preparing biodiesel from waste grease |
| CN105733819A (en) * | 2014-12-09 | 2016-07-06 | 中国中轻国际工程有限公司 | Low-grade grease continuous pre-esterification and methanol continuous recovery energy-saving device and process |
| CN110093212A (en) * | 2019-04-23 | 2019-08-06 | 龙岩卓越新能源股份有限公司 | A kind of method of waste oil continuous esterification production |
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2021
- 2021-07-21 CN CN202110823574.9A patent/CN113563976A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003042343A1 (en) * | 2001-11-16 | 2003-05-22 | Gapes Richard J | Esterification of fatty acids in oil |
| CN105733819A (en) * | 2014-12-09 | 2016-07-06 | 中国中轻国际工程有限公司 | Low-grade grease continuous pre-esterification and methanol continuous recovery energy-saving device and process |
| CN105586154A (en) * | 2015-12-31 | 2016-05-18 | 陕西合盛生物柴油技术开发有限公司 | Continuous esterification method for preparing biodiesel from waste grease |
| CN110093212A (en) * | 2019-04-23 | 2019-08-06 | 龙岩卓越新能源股份有限公司 | A kind of method of waste oil continuous esterification production |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114634843A (en) * | 2022-04-07 | 2022-06-17 | 湖北天基生物能源科技发展有限公司 | Method for esterification reaction of swill-cooked dirty oil and subcritical gaseous methanol |
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Application publication date: 20211029 |