CN114774204B - Device for continuously removing methanol from crude methyl ester at normal pressure and low temperature and application method thereof - Google Patents
Device for continuously removing methanol from crude methyl ester at normal pressure and low temperature and application method thereof Download PDFInfo
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- CN114774204B CN114774204B CN202210431875.1A CN202210431875A CN114774204B CN 114774204 B CN114774204 B CN 114774204B CN 202210431875 A CN202210431875 A CN 202210431875A CN 114774204 B CN114774204 B CN 114774204B
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 327
- 150000004702 methyl esters Chemical class 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 129
- 238000001704 evaporation Methods 0.000 claims abstract description 84
- 230000008020 evaporation Effects 0.000 claims abstract description 81
- 239000000463 material Substances 0.000 claims abstract description 75
- 238000000926 separation method Methods 0.000 claims abstract description 51
- 238000005507 spraying Methods 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000003225 biodiesel Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 7
- 238000007670 refining Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 8
- 238000009835 boiling Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 238000003795 desorption Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 235000019387 fatty acid methyl ester Nutrition 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
Classifications
-
- 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
- C11C1/00—Preparation of fatty acids from fats, fatty oils, or waxes; Refining the fatty acids
- C11C1/08—Refining
- C11C1/10—Refining by distillation
Abstract
The application relates to the field of biodiesel refining, and particularly discloses a crude methyl ester normal-pressure low-temperature continuous methanol removal system and an application method thereof. A crude methyl ester normal pressure low temperature continuous methanol removal system comprising: the separating tank is internally provided with a separating chamber which is communicated along the axial direction of the separating tank; the low-temperature evaporation devices are axially arranged in the separation cavity at intervals along the separation tank, each low-temperature evaporation device is provided with an evaporation cavity for containing materials, and each evaporation cavity is communicated; and the feeding piece is arranged at one end of the separation chamber to convey the crude methyl ester to the low-temperature evaporation device for heating and evaporating methanol in the crude methyl ester. The method for removing methanol comprises the following steps: s1, preheating at a low temperature; s2, introducing materials; s3, carrying out multi-layer low-temperature evaporation treatment, S4 and collecting products; according to the application, the traditional system for removing the methanol from the crude methyl ester is optimized, and the continuous evaporation treatment is carried out on the crude methyl ester by adopting the low-temperature evaporation device, so that the effect of removing the methanol from the crude methyl ester is improved.
Description
Technical Field
The application relates to the field of biodiesel refining, in particular to a device for continuously removing methanol from crude methyl ester at normal pressure and low temperature and an application method thereof.
Background
The bio-diesel is prepared by transesterification of animal and vegetable oil and alcohol, the main component of the bio-diesel is fatty acid monoalkyl ester, most typically fatty acid methyl ester, and the bio-diesel is an excellent petroleum diesel supplement and substitute, and in the refining process, the bio-diesel has a plurality of impurities, such as glycerol, methanol, low-boiling substances and the like, so that the product purity is low, the product quality is poor, the material consumption is high, and when the methanol content in the crude methyl ester is low, the evaporation difficulty is high, and under the condition of limited temperature, the crude methyl ester is difficult to remove methanol, the investment is large, the effect is poor, and the process is complex.
In the prior art, the crude methyl ester containing methanol is generally subjected to heat treatment, but in order to sufficiently remove the methanol in the heating process of the crude methyl ester, the heating temperature needs to be increased, and the crude methyl ester is subjected to sufficient heat treatment under the action of high temperature of more than 150 ℃ so as to remove the methanol.
In view of the above-mentioned related art, the inventors found that the carbonization phenomenon of the crude methyl ester occurs under the long-term high-temperature effect in the process of removing methanol in the existing crude methyl ester, thereby affecting the purification quality of methyl ester. Meanwhile, the efficiency of removing the methanol from the crude methyl ester is low, and the methanol can be effectively removed by fully heating.
Disclosure of Invention
In order to overcome the defect that the prior crude methyl ester cannot be subjected to continuous methanol removal treatment at normal pressure and low temperature, the application provides a device for continuously removing methanol from crude methyl ester at normal pressure and low temperature and an application method thereof.
In a first aspect, the application provides a normal-pressure low-temperature continuous methanol removing device for crude methyl ester, which adopts the following technical scheme:
a device for continuously removing methanol from crude methyl ester at normal pressure and low temperature, which comprises:
The separating tank is internally provided with a separating chamber which is penetrated along the axial direction of the separating tank;
The low-temperature evaporation devices are axially arranged in the separation cavity at intervals along the separation tank, each low-temperature evaporation device is provided with an evaporation cavity for accommodating materials, and each evaporation cavity is communicated;
and the feeding piece is arranged at one end of the separation chamber to convey the crude methyl ester to the low-temperature evaporation device for heating and evaporating methanol in the crude methyl ester.
Through adopting the technical scheme, the traditional device for removing methanol from crude methyl ester is optimized, and the plurality of low-temperature evaporation devices are adopted to perform repeated continuous evaporation treatment on the crude methyl ester.
Preferably, each of the cryogenic evaporation devices comprises:
The heating tray is provided with an evaporation chamber with one end open, and the orthographic projection of the feeding piece is positioned in the evaporation chamber;
at least one layer of heating portion formed as a coil with at least a portion of the coil disposed within the evaporation chamber;
The material collection tray, the material collection tray is located the heating tray is kept away from one side of feed piece, the orthographic projection of heating tray is located the material collection tray, be equipped with on the material collection tray along its thickness direction through-hole.
Through the technical scheme, the application realizes effective heating treatment of the crude methyl ester through the heating tray and the heating part by arranging the technical scheme of the double-tray structure, so that the methanol with a low boiling point is effectively gasified and removed.
Preferably, the cryogenic evaporation device further comprises:
the steam generating device is communicated with one end of the low-temperature heating device;
and one end of the steam output device is communicated with the other end of the low-temperature heating device.
By adopting the technical scheme, the application selects the steam as the medium for heating treatment in the low-temperature evaporation device, and the steam is cheap and easy to obtain in the actual production process, so that the actual production is convenient, and the removal efficiency is effectively improved. On the basis, the application further optimizes the adopted steam temperature, and effectively improves the defect that methyl ester is carbonized in the traditional high-temperature methanol removal process by reducing the evaporation treatment temperature, thereby effectively improving the methanol removal efficiency and the methanol removal quality.
Preferably, the crude methyl ester normal pressure low temperature continuous methanol removing device further comprises a sliding heating driving assembly, wherein the sliding heating driving assembly is arranged between the steam generating device and the low temperature evaporation device, so that the heating part circularly reciprocates along the radial direction of the separation tank.
By adopting the technical scheme, the application further provides the sliding heating driving assembly for driving the heating part, so that the heating part can stir the crude methyl ester through reciprocating motion in the process of heating the crude methyl ester, thereby improving the efficiency of removing the methanol from the crude methyl ester and improving the quality of removing the methanol from the crude methyl ester.
Preferably, the sliding heating driving assembly includes:
The sliding plate is provided with a sliding rail on one side, and the arrangement direction of the sliding rail is consistent with the radial direction of the separating tank;
The fixed block is provided with a hose at one end and is communicated with the steam generating device, a supporting tube is arranged at the other end of the fixed block, one end of the supporting tube is fixedly connected with the heating part, and a chute is arranged at one side of the fixed block so that the fixed block is in sliding connection with the sliding plate;
The driving cylinder, the one end of driving cylinder with the fixed block is fixed to be linked to each other, the fixed block is slidable under the drive of driving cylinder.
By adopting the technical scheme, the fixed block is used as the connecting hinge of the supporting tube and the hose, and the cylinder is driven to drive the fixed block to circularly slide, so that the effective movement of the heating part is realized, the efficiency of removing the methanol from the crude methyl ester is improved, and the quality of removing the methanol from the crude methyl ester is improved.
Preferably, each layer of heating part is provided with two layers of first heating coils and two layers of second heating coils along the axial line position of the separation tank, and each layer of first heating coils and each layer of second heating coils are arranged at intervals.
By adopting the technical scheme, the structure of the heating part is further optimized, and the two layers of first heating coils and the two layers of second heating coils which are oppositely arranged perform relative movement, so that the evaporation treatment area of the crude methyl ester on the heating part is increased, the methanol removing efficiency of the crude methyl ester is improved, and the methanol removing quality of the crude methyl ester is improved.
Preferably, the first heating coil and the second heating coil are moved relative to each other.
By adopting the technical scheme, the application further optimizes the movement direction of the first heating coil and the second heating coil, and forms good dispersion on the crude methyl ester by the arrangement of relative movement, thereby further improving the evaporation treatment area of the heating part on the crude methyl ester, improving the methanol removal efficiency of the crude methyl ester and improving the methanol removal quality of the crude methyl ester.
Preferably, the feeding member further comprises:
The material collecting port is arranged at the lower end of the separating tank, and one end of the material collecting port is provided with the material collecting tank for recovering methyl ester materials after methanol separation;
the gas collection port is arranged at the upper end of the separation tank, and one end of the gas collection port is provided with a vacuum pump to suck the gas in the separation tank.
By adopting the technical scheme, the application collects products at the upper end and the lower end of the separating tank respectively, and the two products generated after the crude methyl ester methanol removal treatment are collected in a separated area, so that the separating efficiency is effectively improved, and the quality of the crude methyl ester methanol removal is improved.
In a second aspect, the application provides a method for removing methanol by using the normal-pressure low-temperature continuous methanol removing device for crude methyl ester, which adopts the following technical scheme:
The method for continuously removing methanol at normal pressure and low temperature comprises the following preparation steps:
s1, preheating at low temperature: firstly, steam is generated by a steam generating device, then is conveyed into a low-temperature evaporation device through a supporting pipe, and then flows out of the steam output device to finish the preheating treatment in the integral separation tank;
S2, feeding materials: the method comprises the steps that crude methyl ester containing methanol is used as a material, the material is fed into the low-temperature evaporation device from a feeding piece, and the material is sprayed onto the surface of a heating part for low-temperature evaporation heating treatment under the spraying treatment of a spraying device of the feeding piece;
S3, multi-layer low-temperature evaporation treatment: continuously introducing materials until the materials fall into the material collecting tray from the heating tray, and then falling into a low-temperature evaporation device of the next layer from the leak holes arranged on the material collecting tray, wherein repeated evaporation ensures complete removal;
S4, collecting products: and collecting gasified methanol by adopting a vacuum pump, continuously dropping methyl ester after methanol removal until the bottom of the separating tank, and collecting the methyl ester through a material collecting port arranged at the bottom of the separating tank, thereby completing the separation and collection of crude methyl ester containing methanol.
By adopting the technical scheme, the application uses the steam as the heating medium for removing the methanol from the crude methyl ester to carry out heat treatment on the methanol with low boiling point, and the methyl ester can not be carbonized due to the low temperature of the steam used as the heating medium. On the basis, the application further improves the methanol removing effect on the crude methyl ester by adopting a multi-layer low-temperature evaporation treatment scheme, thereby effectively reducing the content of methanol in the crude methyl ester and improving the defect that the prior crude methyl ester cannot be subjected to continuous methanol removing treatment at normal pressure and low temperature.
In summary, the application has the following beneficial effects:
according to the application, the traditional device for removing methanol from crude methyl ester is optimized, and a plurality of low-temperature evaporation devices are adopted to perform repeated continuous evaporation treatment on the crude methyl ester.
And secondly, the movement direction of the first heating coil and the movement direction of the second heating coil are further optimized, and good dispersion is formed on the crude methyl ester through the arrangement of relative movement, so that the evaporation treatment area of the heating part on the crude methyl ester is further improved, the methanol removing efficiency of the crude methyl ester is improved, and the methanol removing quality of the crude methyl ester is improved.
Third, through the technical scheme that sets up two tray structures, through heating tray and heating portion, realize the effective heating treatment to crude methyl ester, make the effective gasification desorption of low boiling point methyl alcohol, after the crude methyl ester in the heating tray in every layer of low temperature evaporation plant fills, crude methyl ester overflows and falls into the material collection tray, under the effect of the leak hole that sets up in the material collection tray, falls layer upon layer and carries out multilayer treatment to further improve the heating treatment degree of crude methyl ester, improved the desorption quality of crude methyl ester desorption methyl alcohol.
Drawings
FIG. 1 is a schematic diagram of a crude methyl ester normal pressure low temperature continuous methanol removal device according to an embodiment of the application;
FIG. 2 is a cross-sectional view of a separator tank in a crude methyl ester normal pressure low temperature continuous methanol removal device according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a low-temperature evaporation device in a crude methyl ester normal-pressure low-temperature continuous methanol removal device according to an embodiment of the application;
FIG. 4 is a schematic diagram of a heating tray in a crude methyl ester normal pressure low temperature continuous methanol removal device according to an embodiment of the present application;
FIG. 5 is a schematic diagram of the structure of a raw material collecting tray in a continuous methanol removal device with normal pressure and low temperature for crude methyl ester prepared by the embodiment of the application.
Reference numerals illustrate: 1. a separation tank; 11. a low temperature evaporation device; 111. heating the tray; 112. a heating section; 1121. a first heating coil; 1122. a second heating coil; 113. a raw material collection tray; 1131. a leak hole; 114. a steam generating device; 115. a steam output device; 12. a feed member; 13. a material collection port; 14. a gas collection port; 2. a slide heating drive assembly; 21. a sliding plate; 22. a fixed block; 23. a driving cylinder; 3. a vacuum pump; 4. a methyl ester collection tank; 5. a feed conduit.
Detailed Description
The present application will be described in further detail with reference to fig. 1 to 5.
The embodiment of the application discloses a normal-pressure low-temperature continuous methanol removing device for crude methyl ester. Referring to fig. 1 to 2, a feed pipe 5 is provided on the left side of the separation tank 1, and is connected to a feed member 12 through the feed pipe 5, the feed member 12 is located at the top end portion of the separation tank 1, and crude methyl ester containing methanol is fed into a separation chamber inside the separation tank 1 from top to bottom through the feed member 12. Four groups of low-temperature evaporation devices 11 are arranged in the separation chamber of the separation tank 1 at intervals in the vertical direction, and the crude methyl ester containing methanol is conveyed into the low-temperature evaporation devices 11 for low-temperature evaporation treatment, so that the methanol in the crude methyl ester is effectively removed.
Referring to fig. 2 to 3, a material collecting tray is provided in each low temperature evaporation apparatus 11, and a heating tray 111 is further provided above the material collecting tray, and one end of the heating tray 111 and one end of the material collecting tray are fixed to the inner wall surface of the separation tank 1. The heating tray 111 is provided with a space for accommodating the crude methyl ester conveyed by the feeding member 12, and is further provided with two layers of heating parts 112 for heating the crude methyl ester, wherein the two layers of heating parts 112 are respectively bent by pipelines extending into the separation chamber from two opposite sides of the separation tank 1 to form a first heating coil 1121 and a second heating coil 1122, and the first heating coil 1121 and the second heating coil 1122 which are formed by bending are respectively provided with an upper layer and a lower layer.
Referring to fig. 3, the upper layers of the first heating coil 1121 and the second heating coil 1122 are each a longitudinal continuous bent coil structure, the lower layers of the first heating coil 1121 and the second heating coil 1122 are each a transverse continuous bent coil structure, and the upper layers of the first heating coil 1121 and the second heating coil 1122 are connected by a vertically arranged connecting pipe. The first heating coils 1121 arranged on the upper layer and the lower layer are arranged in a crossing way with the second heating coils 1122 arranged on the upper layer and the lower layer, so that the heating evaporation effect of the crude methyl ester is further improved, and the methanol in the crude methyl ester is effectively removed.
Referring to fig. 4 to 5, the bottom surface area of the heating tray 111 is smaller than that of the material collecting tray, and since the heating tray 111 is filled with coarse methyl ester after continuous feeding of the feeding member 12, the methyl ester after heating treatment in the heating tray 111 gradually overflows and flows into the material collecting tray when continuous feeding is performed. Meanwhile, since the leak 1131 is further formed in the material collecting tray, the crude methyl ester overflowed from the inside of the heating tray 111 leaks from the material collecting tray arranged on the upper layer to the inside of the second-layer heating tray 111, and the secondary heating methanol removing treatment is formed. The double-tray structure can effectively improve the full heating of the crude methyl ester between the multi-layer low-temperature evaporation devices 11, thereby effectively improving the removal efficiency and the removal result of alcohol in the crude methyl ester.
Referring to fig. 2 to 3, one end of the heating part 112 is provided with a support pipe, and the other end of the support pipe is fixedly connected to the fixing block 22. The inside cavity that link up that is equipped with of fixed block 22 is linked together through being linked together with the stay tube in cavity one end that link up, and the other end and the steam generator 114 of cavity link to each other through the hose that link up, and like this, the steam that steam generator 114 produced is through the transportation of hose, fixed pipe and heating portion 112, finally in all collecting steam output device 115, collects the steam after the heat loss through steam output device 115, realizes the cyclic utilization of steam, reduces the cost of taking off the methanol.
Referring to fig. 3, a sliding plate 21 is further disposed at the bottom of the fixed block 22, and a sliding groove disposed on the sliding plate 21 is slidably connected with a sliding rail disposed at the bottom of the fixed block 22, where a direction of the sliding groove is parallel to a direction of the heating portion 112 disposed in the separation tank 1, so that the fixed block 22 is driven by a driving cylinder 23 disposed on the fixed block 22, thereby realizing movement of the fixed block 22 along the sliding groove. Because one end of the fixed block 22 is connected with the supporting pipe, the fixed block 22 which moves circularly back and forth drives the heating part 112 to move back and forth in the heating tray 111, so that the contact area between the crude methyl ester and the heating part 112 is increased through effective movement, and the removal efficiency and the removal result of alcohol in the crude methyl ester are further improved.
Referring to fig. 1, a gas collecting port 14 and a material collecting port 13 are sequentially provided at the top end of a separation tank 1 and the bottom end of the separation tank 1, respectively, and since the removed methanol is in a high-temperature gaseous state, the methanol in a gaseous state is enriched at the top end of the separation tank 1, and is effectively pumped by a vacuum pump 3 connected with one end of the gas collecting port 14. Meanwhile, methyl esters after methanol removal are continuously piled up at the bottom of the separation tank 1, and the methyl esters are effectively collected and stored in the methyl ester collection tank 4 through a material collection port 13 arranged at the bottom of the separation pipe, so that double separation of methyl esters and methanol is effectively realized, and the removal efficiency and removal result of alcohols in methyl crude methyl esters are further improved.
Examples
The biodiesel with 15.58 percent of methanol content is taken as the crude methyl ester containing methanol which is adopted by the application to carry out the methanol removal treatment.
Example 1
The method for continuously removing methanol from crude methyl ester at normal pressure and low temperature comprises the following steps:
s1, preheating at low temperature: firstly, steam is generated by a steam generating device, then is conveyed into a low-temperature evaporation device through a supporting pipe, and then flows out of the steam output device to finish the preheating treatment in the integral separation tank;
S2, feeding materials: introducing crude methyl ester containing methanol into the low-temperature evaporation device from a feeding piece as a material, and spraying the material onto the surface of a heating part under the spray treatment of a spraying device of the feeding piece to perform 75 ℃ low-temperature evaporation heating treatment;
S3, multi-layer low-temperature evaporation treatment: continuously introducing materials until the materials fall into the material collecting tray from the heating tray, and then falling into a low-temperature evaporation device of the next layer from the leak holes arranged on the material collecting tray, wherein repeated evaporation ensures complete removal;
S4, collecting products: and collecting gasified methanol by adopting a vacuum pump, continuously dropping methyl ester after methanol removal until the bottom of the separating tank, and collecting the methyl ester through a material collecting port arranged at the bottom of the separating tank, thereby completing the separation and collection of crude methyl ester containing methanol.
Example 2
The method for continuously removing methanol from crude methyl ester at normal pressure and low temperature comprises the following steps:
s1, preheating at low temperature: firstly, steam is generated by a steam generating device, then is conveyed into a low-temperature evaporation device through a supporting pipe, and then flows out of the steam output device to finish the preheating treatment in the integral separation tank;
s2, feeding materials: introducing crude methyl ester containing methanol into the low-temperature evaporation device from a feeding piece as a material, and spraying the material onto the surface of a heating part under the spray treatment of a spraying device of the feeding piece to perform 77 ℃ low-temperature evaporation heating treatment;
S3, multi-layer low-temperature evaporation treatment: continuously introducing materials until the materials fall into the material collecting tray from the heating tray, and then falling into a low-temperature evaporation device of the next layer from the leak holes arranged on the material collecting tray, wherein repeated evaporation ensures complete removal;
S4, collecting products: and collecting gasified methanol by adopting a vacuum pump, continuously dropping methyl ester after methanol removal until the bottom of the separating tank, and collecting the methyl ester through a material collecting port arranged at the bottom of the separating tank, thereby completing the separation and collection of crude methyl ester containing methanol.
Example 3
The method for continuously removing methanol from crude methyl ester at normal pressure and low temperature comprises the following steps:
s1, preheating at low temperature: firstly, steam is generated by a steam generating device, then is conveyed into a low-temperature evaporation device through a supporting pipe, and then flows out of the steam output device to finish the preheating treatment in the integral separation tank;
S2, feeding materials: introducing crude methyl ester containing methanol into the low-temperature evaporation device from a feeding piece as a material, and spraying the material onto the surface of a heating part under the spray treatment of a spraying device of the feeding piece to perform low-temperature evaporation heating treatment at 80 ℃;
S3, multi-layer low-temperature evaporation treatment: continuously introducing materials until the materials fall into the material collecting tray from the heating tray, and then falling into a low-temperature evaporation device of the next layer from the leak holes arranged on the material collecting tray, wherein repeated evaporation ensures complete removal;
S4, collecting products: and collecting gasified methanol by adopting a vacuum pump, continuously dropping methyl ester after methanol removal until the bottom of the separating tank, and collecting the methyl ester through a material collecting port arranged at the bottom of the separating tank, thereby completing the separation and collection of crude methyl ester containing methanol.
The crude methyl esters prepared in examples 1 to 3 were subjected to methanol content detection. The remaining test results are shown in table 1 below:
Table 1 performance test table
In connection with the analysis of the performance test tables of examples 1 to 3, it can be found that:
The application uses steam as heating medium for removing methyl ester from crude methyl ester to heat treat the methyl ester with low boiling point, and the methyl ester is not carbonized because of the low temperature of the steam used as heating medium. On the basis, the application further improves the methanol removing effect on the crude methyl ester by adopting a multi-layer low-temperature evaporation treatment scheme, thereby effectively reducing the content of methanol in the crude methyl ester and improving the defect that the prior crude methyl ester cannot be subjected to continuous methanol removing treatment at normal pressure and low temperature.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (7)
1. A device for continuously removing methanol from crude methyl ester at normal pressure and low temperature, which is characterized by comprising:
the separation device comprises a separation tank (1), wherein a separation chamber which is penetrated along the axial direction of the separation tank (1) is arranged in the separation tank;
The low-temperature evaporation devices (11) are axially arranged in the separation chamber at intervals along the separation tank (1), each low-temperature evaporation device (11) is provided with an evaporation chamber for containing materials, and each evaporation chamber is communicated;
a feeding piece (12), wherein the feeding piece (12) is arranged at one end of the separation chamber to convey the crude methyl ester to the low-temperature evaporation device (11) for heating and evaporating the methanol in the crude methyl ester;
Each of the cryogenic evaporation devices (11) comprises:
A heating tray (111), wherein the heating tray (111) is provided with an evaporation chamber with one end open, and the orthographic projection of the feeding piece (12) is positioned in the evaporation chamber;
At least one layer of heating portion (112), the heating portion (112) being formed as a coil and at least a portion of the coil being disposed within the evaporation chamber;
The material collecting tray is arranged on one side, far away from the feeding piece (12), of the heating tray (111), the orthographic projection of the heating tray (111) is positioned in the material collecting tray, and a through hole (1131) penetrating along the thickness direction of the material collecting tray is formed in the material collecting tray;
the cryogenic evaporation device (11) further comprises:
A steam generating device (114), wherein one end of the steam generating device (114) is communicated with one end of the low-temperature heating device;
and one end of the steam output device (115) is communicated with the other end of the low-temperature heating device.
2. The normal pressure low temperature continuous methanol removing device for crude methyl ester according to claim 1, further comprising a sliding heating driving assembly (2), wherein the sliding heating driving assembly (2) is arranged between the steam generating device (114) and the low temperature evaporation device (11) so as to enable the heating part (112) to circularly reciprocate along the radial direction of the separation tank (1).
3. A crude methyl ester atmospheric pressure low temperature continuous methanol removal device according to claim 2, wherein the sliding heating driving assembly (2) comprises:
A sliding plate (21), wherein one side of the sliding plate (21) is provided with a sliding rail, and the arrangement direction of the sliding rail is consistent with the radial direction of the separating tank (1);
The fixed block (22), one end of the fixed block (22) is provided with a hose and is communicated with the steam generating device (114), the other end of the fixed block (22) is provided with a supporting tube, one end of the supporting tube is fixedly connected with the heating part (112), and one side of the fixed block (22) is provided with a chute so that the fixed block (22) is in sliding connection with the sliding plate (21);
The driving cylinder (23), one end of the driving cylinder (23) is fixedly connected with the fixed block (22), and the fixed block (22) can slide under the driving of the driving cylinder (23).
4. A crude methyl ester atmospheric pressure low temperature continuous methanol removal device according to claim 3, wherein each layer of said heating part (112) is provided with two layers of first heating coils (1121) and two layers of second heating coils (1122) opposite to each other along the axial line position of said separation tank (1), and each layer of said first heating coils (1121) is spaced from each layer of said second heating coils (1122).
5. The apparatus for atmospheric low temperature continuous methanol removal of crude methyl ester as in claim 4 wherein said first heating coil (1121) and said second heating coil (1122) are in relative motion.
6. A crude methyl ester atmospheric pressure low temperature continuous methanol removal unit in accordance with claim 1, wherein said feed member (12) further comprises:
The material collecting port (13), the material collecting port (13) is arranged at the lower end of the separating tank (1), and one end of the material collecting port (13) is provided with a material collecting tank for recovering methyl ester materials after methanol separation;
And a gas collection port (14), wherein the gas collection port (14) is arranged at the upper end of the separation tank (1), and one end of the gas collection port (14) is provided with a vacuum pump (3) to perform suction treatment on the gas in the separation tank (1).
7. A method for removing methanol by using the continuous methanol removing device with normal pressure and low temperature for crude methyl ester according to any one of claims 1 to 6, which is characterized by comprising the following treatment steps:
S1, preheating at low temperature: firstly, steam is generated by a steam generating device (114), then is conveyed into a low-temperature evaporation device (11) through a supporting pipe, and flows out of a steam output device (115) to finish the preheating treatment in the integral separation tank (1);
S2, feeding materials: introducing crude methyl ester containing methanol into the low-temperature evaporation device (11) from a feeding member (12) as a material, and spraying the material onto the surface of a heating part (112) for low-temperature evaporation heating treatment under the spray treatment of a spraying device of the feeding member (12);
S3, multi-layer low-temperature evaporation treatment: continuously introducing materials until the materials fall into the material collecting tray from the heating tray (111), and then falling into a low-temperature evaporation device (11) of the next layer from a leak hole (1131) arranged on the material collecting tray, so that repeated evaporation ensures complete removal;
S4, collecting products: and collecting gasified methanol by adopting a vacuum pump (3), continuously dropping methyl ester after methanol removal until the bottom of the separating tank (1), and collecting the methyl ester through a material collecting port (13) arranged at the bottom of the separating tank (1), thereby completing the separation and collection of the crude methyl ester containing methanol.
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