CN114774204A - Normal-pressure low-temperature continuous methanol removing system for crude methyl ester and application method thereof - Google Patents
Normal-pressure low-temperature continuous methanol removing system for crude methyl ester and application method thereof Download PDFInfo
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- CN114774204A CN114774204A CN202210431875.1A CN202210431875A CN114774204A CN 114774204 A CN114774204 A CN 114774204A CN 202210431875 A CN202210431875 A CN 202210431875A CN 114774204 A CN114774204 A CN 114774204A
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- methanol
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 330
- 150000004702 methyl esters Chemical class 0.000 title claims abstract description 141
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 128
- 238000001704 evaporation Methods 0.000 claims abstract description 89
- 230000008020 evaporation Effects 0.000 claims abstract description 81
- 239000000463 material Substances 0.000 claims abstract description 69
- 238000000926 separation method Methods 0.000 claims abstract description 69
- 238000005507 spraying Methods 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 239000003225 biodiesel Substances 0.000 abstract description 6
- 230000002688 persistence Effects 0.000 abstract description 2
- 238000007670 refining Methods 0.000 abstract description 2
- 238000003795 desorption Methods 0.000 description 30
- 230000007547 defect Effects 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 238000009835 boiling Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 150000002148 esters Chemical group 0.000 description 2
- 238000002309 gasification Methods 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
- 238000004458 analytical method Methods 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008162 cooking oil Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000005516 engineering process Methods 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
- 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
- 238000004064 recycling Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
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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 removing system comprises: the separation tank is internally provided with a separation chamber which is communicated along the axial direction of the separation tank; the low-temperature evaporation devices are arranged in the separation cavity at intervals along the axial direction of the separation tank, each low-temperature evaporation device is provided with an evaporation cavity for containing materials, and each evaporation cavity is communicated with each other; and the feeding piece is arranged at one end of the separation chamber and is used for conveying the crude methyl ester to the low-temperature evaporation device for heating and evaporating the methanol in the crude methyl ester. The method for removing methanol comprises the following steps: s1, low-temperature preheating; s2, introducing materials; s3, multilayer low-temperature evaporation treatment and S4, product collection; this application is through optimizing the system of traditional crude methyl ester demethyl mellow wine, adopts low temperature evaporation plant to carry out the evaporation treatment of persistence to crude methyl ester, has improved the effect that crude methyl ester demethyl mellow wine.
Description
Technical Field
The application relates to the field of biodiesel refining, in particular to a crude methyl ester normal-pressure low-temperature continuous methanol removing system and an application method thereof.
Background
The illegal cooking oil contains animal and vegetable oil and alcohol, and is prepared into biodiesel through ester exchange, the main component of the biodiesel is fatty acid monoalkyl ester, most typically fatty acid methyl ester, and the biodiesel is an excellent supplement and substitute for petroleum diesel.
In the prior art, the crude methyl ester containing methanol is generally heated, but in the heating process of the crude methyl ester, in order to remove the methanol sufficiently, the heating temperature needs to be increased, and the methanol is sufficiently heated under the action of high temperature of more than 150 ℃ so as to remove the methanol.
In view of the above-mentioned related technologies, the inventors found that in the process of removing methanol from the existing crude methyl ester, the crude methyl ester is carbonized under the action of a high temperature for a long time, thereby affecting the purification quality of the methyl ester. Meanwhile, the efficiency of removing the methanol from the crude methyl ester is low, and the methanol can be effectively removed only by fully heating.
Disclosure of Invention
In order to overcome the defect that the conventional crude methyl ester cannot be subjected to continuous methanol removal treatment under the normal pressure and low temperature state, the application provides a crude methyl ester normal pressure and low temperature continuous methanol removal system and an application method thereof.
In a first aspect, the application provides a crude methyl ester normal-pressure low-temperature continuous methanol removal system, which adopts the following technical scheme:
a crude methyl ester atmospheric pressure low temperature continuous methanol removing system comprises:
the separation tank is internally provided with a separation chamber which is communicated along the axial direction of the separation tank;
the low-temperature evaporation devices are arranged in the separation cavity at intervals along the axial direction of the separation tank, each low-temperature evaporation device is provided with an evaporation cavity for containing materials, and the evaporation cavities are communicated;
and the feeding piece is arranged at one end of the separation chamber and is used for conveying the crude methyl ester to the low-temperature evaporation device to be heated and evaporated.
Through adopting above-mentioned technical scheme, this application technical scheme removes the system of methyl alcohol through optimizing traditional thick methyl ester simultaneously, adopts a plurality of low temperature evaporation plant to carry out the evaporation treatment of many times persistence to thick methyl ester, because a plurality of low temperature evaporation plant that this application adopted all are equipped with the evaporation cavity, through the multilayer heating of evaporation cavity, effectively improve traditional desorption methyl alcohol single structure desorption methyl alcohol efficiency and the not good defect of desorption quality to thick methyl ester removes the effect of methyl alcohol has further been improved.
Preferably, each of the low temperature evaporation devices includes:
the heating tray is provided with an evaporation chamber with one open end, and the orthographic projection of the feeding piece is positioned in the evaporation chamber;
at least one layer of heating part which is formed into a coil pipe and at least one part of the coil pipe is arranged in the evaporation chamber;
the material collecting tray is arranged on one side, away from the feeding piece, of the heating tray, the orthographic projection of the heating tray is located in the material collecting tray, and the material collecting tray is provided with a through hole in the thickness direction of the material collecting tray.
Through adopting above-mentioned technical scheme, this application is through the technical scheme who sets up two tray structures, through heating tray and heating portion, realize the effective heating process to thick methyl ester, make the effective gasification desorption of the methyl alcohol of low boiling point, thick methyl ester in the heating tray in every layer of low temperature evaporation device fills with the back, thick methyl ester overflows and falls into to the material and collects the tray in, under the effect of the small opening that sets up in the tray is collected to the material, the whereabouts carries out multilayer processing layer upon layer, thereby further improve the heating process degree of thick methyl ester, the desorption quality of thick methyl ester desorption methyl alcohol has been improved.
Preferably, the low-temperature evaporation apparatus further includes:
one end of 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.
Through adopting above-mentioned technical scheme, this application chooses steam as the medium of heating treatment in the low temperature evaporation plant for use, because steam is cheap easily to obtain in the actual production process, the actual production of being convenient for has effectively improved desorption efficiency. On this basis, the steam temperature that this application further optimized the adoption, through reducing evaporation treatment's temperature, effectively improve traditional high temperature desorption methyl alcohol in-process, can the defect of carbomorphism methyl ester to when effectively improving the efficiency of desorption methyl alcohol, still further improve desorption methyl alcohol quality.
Preferably, the crude methyl ester normal-pressure low-temperature continuous methanol removing system further comprises a sliding heating driving assembly, and 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.
Through adopting above-mentioned technical scheme, this application drives heating portion through further having set up slip heating drive assembly, makes heating portion carry out the in-process that heats to thick methyl ester, realizes the stirring to thick methyl ester through reciprocating motion to improve the efficiency of thick methyl ester desorption methyl alcohol, improved the quality of thick methyl ester desorption methyl alcohol.
Preferably, the sliding heating driving assembly includes:
the separation tank comprises a sliding plate, a separation tank and a separation tank, wherein a sliding rail is arranged on one side of the sliding plate, and the arrangement direction of the sliding rail is consistent with the radial direction of the separation tank;
a fixed block, one end of which is provided with a hose and is communicated with the steam generating device, the other end of which is provided with a supporting tube, one end of the supporting tube is fixedly connected with the heating part, and one side of the fixed block is provided with a chute so that the fixed block is slidably connected with the sliding plate;
the driving mechanism comprises a driving cylinder, wherein one end of the driving cylinder is fixedly connected with a fixed block, and the fixed block can slide under the driving of the driving cylinder.
Through adopting above-mentioned technical scheme, this application passes through the fixed block as the connecting pivot of stay tube and hose, and the circulation through driving actuating cylinder drive fixed block slides, realizes the effective motion of heating portion to improve the efficiency of thick methyl ester desorption methyl alcohol, improved the quality of thick methyl ester desorption methyl alcohol.
Preferably, each layer of heating part is provided with two layers of first heating coils and two layers of second heating coils along the axis position of separator tank, and each layer of first heating coils and each layer of second heating coils are arranged at intervals.
Through adopting above-mentioned technical scheme, the structure of heating portion has further been optimized in this application, carries out relative motion through two-layer first heating coil and two-layer second heating coil that set up relatively, improves the area of thick methyl ester evaporation treatment on the heating portion to improve the efficiency of thick methyl ester desorption methyl alcohol, improved the quality of thick methyl ester desorption methyl alcohol.
Preferably, the first heating coil and the second heating coil move relatively.
Through adopting above-mentioned technical scheme, first heating coil and second heating coil direction of motion have further been optimized in this application, through relative motion's setting, form good dispersion to thick methyl ester to further improve the heating portion to the evaporation treatment's of thick methyl ester area, improved the efficiency of thick methyl ester desorption methyl alcohol, improved the quality of thick methyl ester desorption methyl alcohol.
Preferably, the feeding member further comprises:
the material collecting port is arranged at the lower end of the separation tank, and one end of the material collecting port is provided with the material collecting tank for recovering methyl ester materials after methanol is separated;
and the gas collecting port is arranged at the upper end of the separation tank, and a vacuum pump is arranged at one end of the gas collecting port so as to suck the gas in the separation tank.
Through adopting above-mentioned technical scheme, this application is collected the product respectively at the upper end and the lower extreme of knockout drum, removes the methanol-removing to the thick methyl ester and handles two kinds of products that the back produced and carry out subregion and collect, when effectively improving separation efficiency, has changed the quality that thick methyl ester removed the methanol-removing.
In a second aspect, the application provides a method for removing methanol by using the above crude methyl ester normal-pressure low-temperature continuous methanol removing system, which adopts the following technical scheme:
the method for continuously removing methanol at normal pressure and low temperature comprises the following preparation steps:
s1, low-temperature preheating: firstly, generating steam by a steam generating device, conveying the steam into a low-temperature evaporation device through a supporting pipe, and then flowing out of a steam output device to finish preheating treatment in an integral separation tank;
s2, introducing materials: taking crude methyl ester containing methanol as a material, introducing the crude methyl ester into the low-temperature evaporation device through a feeding piece, and spraying the crude methyl ester 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, multilayer low-temperature evaporation treatment: continuously introducing the materials until the materials fall into the material collecting tray from the heating tray, and then falling to a low-temperature evaporation device on the next layer through a leakage hole arranged on the material collecting tray, and repeatedly evaporating to ensure complete removal;
s4, product collection: and (3) collecting the gasified methanol by adopting a vacuum pump, continuously dropping the methyl ester after removing the methanol until the bottom of the separation tank, and collecting the methyl ester through a material collecting port arranged at the bottom of the separation tank to finish the separation and collection of the crude methyl ester containing the methanol.
Through adopting above-mentioned technical scheme, this application removes the heating medium of methyl ester methanol-removing as thick through steam, carries out heat treatment to the methyl alcohol of low boiling, because steam when as heating medium, its temperature is lower, can not carry out the carbomorphism to methyl ester. On the basis, the methanol removal effect of the crude methyl ester is further improved through a scheme of multi-layer low-temperature evaporation treatment, so that the content of methanol in the crude methyl ester is effectively reduced, and the defect that the existing crude methyl ester cannot be subjected to continuous methanol removal treatment under the normal-pressure low-temperature state is overcome.
In summary, the present application has the following beneficial effects:
first, this application removes the system of methyl alcohol through optimizing traditional thick methyl ester, adopts a plurality of low temperature evaporation plant to carry out the evaporation treatment of continuation many times to thick methyl ester, because a plurality of low temperature evaporation plant that this application adopted all are equipped with the evaporation cavity, and multilayer heating through the evaporation cavity handles, effectively improves traditional desorption methyl alcohol simplex construction desorption methyl alcohol efficiency and the not good defect of desorption quality to thick methyl ester's effect of removing methyl alcohol has further been improved.
The second, further optimized first heating coil and second heating coil direction of motion, through relative motion's setting, formed good dispersion to thick methyl ester to further improved the area of heating portion to the evaporation treatment of thick methyl ester, improved the efficiency of thick methyl ester desorption methyl alcohol, improved the quality of thick methyl ester desorption methyl alcohol.
Third, through the technical scheme who sets up two tray structures, through heating tray and heating portion, realize the effective heat treatment to thick methyl ester, make the effective gasification desorption of the methyl alcohol of low boiling point, after thick methyl ester in the heating tray among every layer of low temperature evaporation device fills up, thick methyl ester overflows and falls into to the material and collects the tray in, under the effect of the small opening that sets up in the material is collected the tray, the whereabouts carries out multilayer processing layer upon layer, thereby further improve the heat treatment degree of thick methyl ester, the desorption quality of thick methyl ester desorption methyl alcohol has been improved.
Drawings
FIG. 1 is a schematic diagram of the structure of a crude methyl ester atmospheric low temperature continuous demethanization system of an embodiment of the present application;
FIG. 2 is a sectional view of the knockout drum in the atmospheric low temperature continuous demethanization system for crude methyl ester of the present application example;
FIG. 3 is a schematic diagram of the low temperature evaporation plant in the crude methyl ester atmospheric low temperature continuous methanol removal system of the embodiment of the present application;
FIG. 4 is a schematic view of the heating tray structure in the atmospheric low temperature continuous methanol removal system for crude methyl ester of the present application;
FIG. 5 is a schematic diagram of the structure of the raw material collecting tray in the atmospheric low-temperature continuous methanol removing system for crude methyl ester prepared by the embodiment of the application.
Description of reference numerals: 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 feeding member; 13. a material collection port; 14. a gas collection port; 2. a sliding 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 is described in further detail below with reference to fig. 1-5.
The embodiment of the application discloses a system for continuously removing methanol from crude methyl ester at normal pressure and low temperature. 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 the crude methyl ester containing methanol is fed into the separation chamber inside the separation tank 1 from the top down 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, each low-temperature evaporation device 11 is provided with a material collection tray, a heating tray 111 is further provided above the material collection tray, and one end of each of the heating tray 111 and the material collection tray is fixed to the inner wall surface of the separation tank 1. The heating tray 111 is internally provided with a holding space for holding coarse methyl ester conveyed by the feeding part 12, and in the holding space, two layers of heating parts 112 for heating the coarse methyl ester are further arranged, 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 both 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 both longitudinal continuous bending coil structures, the lower layers of the first heating coil 1121 and the second heating coil 1122 are both transverse continuous bending coil structures, and the upper layers of the first heating coil 1121 and the second heating coil 1122 are communicated through vertically arranged connecting pipes. The first heating coil 1121 arranged on the upper layer and the second heating coil 1122 arranged on the lower layer are arranged in a crossed manner, so that the heating and evaporating effects of the crude methyl ester are further improved, and the methanol in the crude methyl ester is effectively removed.
Referring to fig. 4 to 5, the area of the bottom surface of the heating tray 111 is smaller than that of the material collecting tray, and after the feeding member 12 continuously feeds the heating tray 111, the heating tray 111 is filled with coarse methyl ester, and when the coarse methyl ester is continuously fed, the methyl ester heated in the heating tray 111 gradually overflows and flows into the material collecting tray. Meanwhile, as the leakage holes 1131 are also formed in the material collecting tray, crude methyl ester overflowing from the inside of the heating tray 111 is leaked and dripped into the inside of the second layer of heating tray 111 from the material collecting tray arranged on the upper layer, so that secondary heating methanol removal treatment is formed. Such two tray structures can effectively improve thick methyl ester and fully heat between multilayer low temperature evaporation plant 11 to effectively improve the desorption efficiency and the desorption result of the methyl ester in thick methyl ester of methyl alcohol.
Referring to fig. 2 to 3, a support tube is provided at one end of the heating part 112, and the other end of the support tube 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 cavity one end and the stay tube that link up, and the other end of the cavity that link up passes through the hose with steam generator 114 and links to each other, and like this, the steam that steam generator 114 produced is through the transportation back of hose, fixed pipe and heating portion 112, finally in whole collection to steam output device 115, collects the steam after the heat dissipates through steam output device 115, realizes the recycling of steam, reduces the cost of getting rid of the mellow wine.
Referring to fig. 3, a sliding plate 21 is further disposed at the bottom of the fixed block 22, a sliding groove disposed on the sliding plate 21 is slidably connected to a sliding rail disposed at the bottom of the fixed block 22, and a direction in which the sliding groove is disposed is parallel to a direction in which the heating portion 112 in the separation tank 1 is disposed, so that the fixed block 22 is driven by a driving cylinder 23 disposed on the fixed block 22, and the fixed block 22 moves along the sliding groove. Because fixed block 22 one end is connected with the stay tube, circulating reciprocating motion's fixed block 22 drives heating portion 112 and makes a round trip reciprocating motion in heating tray 111 to through effectual motion, improve the area of contact between thick methyl ester and the heating portion 112, thereby further improve the desorption efficiency and the desorption result of mellow wine in the thick methyl ester of methyl.
Referring to fig. 1, a gas collection port 14 and a material collection port 13 are sequentially arranged at the top end of a separation tank 1 and the bottom end of the separation tank 1, and since the removed methanol is in a high-temperature gaseous state, the methanol in the gaseous state is enriched at the top end of the separation tank 1, and the high-temperature methanol gas is effectively pumped through a vacuum pump 3 communicated with one end of the gas collection port 14. Meanwhile, methyl ester after methanol removal is continuously accumulated at the bottom of the separation tank 1, and the methyl ester is effectively collected and stored in the methyl ester collection tank 4 through the material collection port 13 arranged at the bottom of the separation pipe, so that double separation of methyl ester and methanol is effectively realized, and the removal efficiency and the removal result of alcohol in crude methyl ester are further improved.
Examples
The biodiesel with 15.58 percent of methanol content is taken as the crude methyl ester containing methanol used in the application for 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, low-temperature preheating: firstly, generating steam by a steam generating device, conveying the steam into a low-temperature evaporation device through a supporting pipe, and then discharging the steam from a steam output device to finish preheating treatment in an integral separation tank;
s2, introducing materials: taking crude methyl ester containing methanol as a material, introducing the crude methyl ester into the low-temperature evaporation device through a feeding piece, and spraying the crude methyl ester onto the surface of a heating part to perform low-temperature evaporation heating treatment at 75 ℃ under the spraying treatment of a spraying device of the feeding piece;
s3, multilayer low-temperature evaporation treatment: continuously introducing the materials until the materials fall into the material collecting tray from the heating tray, and then falling to a low-temperature evaporation device on the next layer through a leakage hole arranged on the material collecting tray, and repeatedly evaporating to ensure complete removal;
s4, product collection: and (3) collecting the gasified methanol by adopting a vacuum pump, continuously dropping the methyl ester subjected to methanol removal until the bottom of the separation tank, and collecting the methyl ester through a material collecting port arranged at the bottom of the separation tank to finish the separation and collection of the crude methyl ester containing the methanol.
Example 2
The method for continuously removing methanol from crude methyl ester at normal pressure and low temperature comprises the following steps:
s1, low-temperature preheating: firstly, generating steam by a steam generating device, conveying the steam into a low-temperature evaporation device through a supporting pipe, and then discharging the steam from a steam output device to finish preheating treatment in an integral separation tank;
s2, introducing materials: taking crude methyl ester containing methanol as a material, introducing the crude methyl ester into the low-temperature evaporation device through a feeding piece, and spraying the crude methyl ester onto the surface of a heating part for low-temperature evaporation heating treatment at 77 ℃ under the spraying treatment of a spraying device of the feeding piece;
s3, multilayer low-temperature evaporation treatment: continuously introducing the materials until the materials fall into the material collecting tray from the heating tray, and then falling to a low-temperature evaporation device on the next layer through a leakage hole arranged on the material collecting tray, and repeatedly evaporating to ensure complete removal;
s4, product collection: and (3) collecting the gasified methanol by adopting a vacuum pump, continuously dropping the methyl ester subjected to methanol removal until the bottom of the separation tank, and collecting the methyl ester through a material collecting port arranged at the bottom of the separation tank to finish the separation and collection of the crude methyl ester containing the methanol.
Example 3
The method for continuously removing methanol from crude methyl ester at normal pressure and low temperature comprises the following steps:
s1, low-temperature preheating: firstly, generating steam by a steam generating device, conveying the steam into a low-temperature evaporation device through a supporting pipe, and then flowing out of a steam output device to finish preheating treatment in an integral separation tank;
s2, introducing materials: taking crude methyl ester containing methanol as a material, introducing the crude methyl ester into the low-temperature evaporation device through a feeding piece, and spraying the crude methyl ester onto the surface of a heating part to perform low-temperature evaporation heating treatment at 80 ℃ under the spraying treatment of a spraying device of the feeding piece;
s3, multilayer low-temperature evaporation treatment: continuously introducing the materials until the materials fall into the material collecting tray from the heating tray, and then falling to a low-temperature evaporation device on the next layer through a leakage hole arranged on the material collecting tray, and repeatedly evaporating to ensure complete removal;
s4, product collection: and (3) collecting the gasified methanol by adopting a vacuum pump, continuously dropping the methyl ester after removing the methanol until the bottom of the separation tank, and collecting the methyl ester through a material collecting port arranged at the bottom of the separation tank to finish the separation and collection of the crude methyl ester containing the methanol.
Performance test
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
By combining the analysis of the performance detection tables of the embodiments 1 to 3, the following results can be found:
this application removes the heating medium of methyl ester methanol-out through steam as crude, carries out heat treatment to the methyl alcohol of low boiling point, because when steam was as heating medium, its temperature is lower, can not carry out the carbomorphism to methyl ester. On the basis, the methanol removal effect of the crude methyl ester is further improved through a scheme of multi-layer low-temperature evaporation treatment, so that the content of methanol in the crude methyl ester is effectively reduced, and the defect that the existing crude methyl ester cannot be subjected to continuous methanol removal treatment under the normal-pressure low-temperature state is overcome.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. A crude methyl ester normal pressure low temperature continuous methanol removing system is characterized by comprising:
the separation tank (1) is internally provided with a separation chamber which is communicated along the axial direction of the separation tank (1);
the low-temperature evaporation devices (11) are axially arranged in the separation cavity at intervals along the separation tank (1), each low-temperature evaporation device (11) is provided with an evaporation cavity for containing materials, and each evaporation cavity is communicated with each other;
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.
2. An atmospheric-pressure low-temperature continuous methanol removing system for crude methyl ester according to claim 1, wherein each of the low-temperature evaporation units (11) comprises:
the heating tray (111) is provided with an evaporation chamber with one open end, and the orthographic projection of the feeding piece (12) is positioned in the evaporation chamber;
at least one layer of heating (112), the heating (112) formed as a coil and at least a portion of the coil disposed within the evaporation chamber;
the material collecting tray is arranged on one side, away from the feeding piece (12), of the heating tray (111), the orthographic projection of the heating tray (111) is located in the material collecting tray, and the material collecting tray is provided with a through hole (1131) which is communicated along the thickness direction of the material collecting tray.
3. An atmospheric-pressure low-temperature continuous methanol removing system for crude methyl ester according to claim 2, wherein the low-temperature evaporation device (11) further comprises:
the steam generating device (114), one end of the said steam generating device (114) is communicated with one end of the said 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.
4. An atmospheric-pressure low-temperature continuous methanol removing system for crude methyl ester according to claim 3, 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 knockout drum (1).
5. The atmospheric-pressure low-temperature continuous methanol removing system for the crude methyl ester according to claim 4, wherein the sliding heating driving assembly (2) comprises:
the separation tank comprises a sliding plate (21), wherein a sliding rail is arranged on one side of the sliding plate (21), and the arrangement direction of the sliding rail is consistent with the radial direction of the separation tank (1);
a fixed block (22), wherein 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 pipe, one end of the supporting pipe is fixedly connected with the heating part (112), and one side of the fixed block (22) is provided with a sliding groove so that the fixed block (22) is in sliding connection with the sliding plate (21);
the device comprises a driving air cylinder (23), one end of the driving air cylinder (23) is fixedly connected with the fixed block (22), and the fixed block (22) can slide under the driving of the driving air cylinder (23).
6. A crude methyl ester atmospheric pressure low temperature continuous methanol removing system according to claim 5, characterized in that, two layers of first heating coils (1121) and two layers of second heating coils (1122) are oppositely arranged on each layer of the heating part (112) along the axial position of the separation tank (1), and each layer of the first heating coils (1121) and each layer of the second heating coils (1122) are arranged at intervals.
7. The atmospheric-pressure low-temperature continuous methanol removal system for crude methyl ester according to claim 6, wherein the first heating coil (1121) and the second heating coil (1122) move relatively.
8. An atmospheric-pressure low-temperature continuous methanol removal system for crude methyl ester according to claim 1, wherein the feeding member (12) further comprises:
the material collecting port (13) is arranged at the lower end of the separating tank (1), and a material collecting tank is arranged at one end of the material collecting port (13) to recover methyl ester materials after methanol separation;
the gas collection port (14) is arranged at the upper end of the separation tank (1), and a vacuum pump (3) is arranged at one end of the gas collection port (14) to suck the gas in the separation tank (1).
9. The method for removing methanol by using the crude methyl ester normal-pressure low-temperature continuous methanol removing system as claimed in any one of claims 1 to 8 is characterized by comprising the following processing steps:
s1, low-temperature preheating: firstly, steam is generated by a steam generating device (114), then is conveyed to a low-temperature evaporation device (11) through a supporting pipe, and then flows out of a steam output device (115) to finish the preheating treatment in the integral separating tank (1);
s2, introducing materials: coarse methyl ester containing methanol is used as a material and is introduced into the low-temperature evaporation device (11) through a feeding piece (12), and the coarse methyl ester is sprayed onto the surface of the heating part (112) to be subjected to low-temperature evaporation and heating treatment under the spraying treatment of a spraying device of the feeding piece (12);
s3, multilayer low-temperature evaporation treatment: continuously introducing the materials until the materials fall into a material collecting tray from a heating tray (111), then falling to a low-temperature evaporation device (11) on the next layer from a leakage hole (1131) arranged on the material collecting tray, and repeatedly evaporating to ensure complete removal;
s4, product collection: the gasified methanol is collected by a vacuum pump (3), the methyl ester after the methanol is removed continuously falls to the bottom of the separation tank (1), and is collected by a material collecting port (13) arranged at the bottom of the separation tank (1), so that the separation and collection of the crude methyl ester containing the methanol can be completed.
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