CN211189150U - Dimethyl oxalate falling film evaporator for synthesizing oxamide - Google Patents
Dimethyl oxalate falling film evaporator for synthesizing oxamide Download PDFInfo
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- CN211189150U CN211189150U CN201922168334.0U CN201922168334U CN211189150U CN 211189150 U CN211189150 U CN 211189150U CN 201922168334 U CN201922168334 U CN 201922168334U CN 211189150 U CN211189150 U CN 211189150U
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- film evaporator
- falling film
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- liquid separator
- dimethyl oxalate
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Abstract
The utility model relates to a dimethyl oxalate falling film evaporator for synthesizing oxamide, which comprises a housin, the overflow annular, falling film evaporator shell side group and vapour and liquid separator, the casing top has feed inlet and its bottom and is equipped with discharge gate and nitrogen gas import, falling film evaporator shell side group sets up in the casing and its top lid is equipped with the aiutage, falling film evaporator shell side group includes the even falling film evaporator shell side in the casing of a plurality of, the overflow annular cup joints in the aiutage top and is located the feed inlet below of casing, vapour and liquid separator sets up outside the casing, vapour and liquid separator's top and the import intercommunication of falling film evaporator shell side upper portion, vapour and liquid separator bottom and the export intercommunication of falling film evaporator shell side bottom. The dimethyl oxalate falling-film evaporator for synthesizing the oxamide can change the heating rate by adjusting the liquid level of the steam condensate in the gas-liquid separator so as to change the evaporation rate of the dimethyl oxalate and achieve the aim of adjusting the purity and the yield of the oxamide, and has the advantages of simple structure, low manufacturing cost, convenience in operation and good effect.
Description
Technical Field
The utility model relates to a falling film evaporator especially relates to a dimethyl oxalate falling film evaporator for synthesizing oxamide.
Background
Oxamide is a white powder containing nitrogen 31.8%, has no moisture absorption in air, no toxicity and easy storage, has water solubility of 0.016%, and gradually releases ammonia nitrogen and carbon dioxide during hydrolysis or biological decomposition, and is a good urea-aldehyde slow-release fertilizer.
The synthetic route of oxamide is dimethyl oxalate ammonolysis. Mixing the mixed gas of dimethyl oxalate gas and nitrogen gas in a reactor, and reacting dimethyl oxalate with nitrogen gas to generate oxamide solid powder and methanol gas. Since nitrogen is more easily separated from the reaction product system, the reaction system is often used in excess of nitrogen. The existing dimethyl oxalate factory is mostly constructed by matching with an ethylene glycol device, and redundant dimethyl oxalate can be sent to an oxamide synthesis process. Because the price of the ethylene glycol product is greatly influenced by the market, the factory can adjust the capacity of the ethylene glycol device according to the price of the ethylene glycol product in order to improve the benefit, thereby bringing about the change of the capacity of the dimethyl oxalate.
The falling-film evaporator for adjusting the evaporation capacity of dimethyl oxalate in the prior art has high manufacturing cost, poor effect and inconvenience in adjusting the productivity, so that the falling-film evaporator with simple structure, low manufacturing cost and good effect is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the defects of the prior art, and provides a dimethyl oxalate falling film evaporator for synthesizing oxamide, which has the advantages of simple structure, low manufacturing cost, good effect and convenient capacity adjustment.
The utility model discloses a realize through following technical scheme: the utility model provides a dimethyl oxalate falling film evaporator for synthesizing oxamide, includes casing, overflow annular, falling film evaporator shell side group and vapour and liquid separator, the casing top has feed inlet and its bottom and is equipped with discharge gate and nitrogen gas import, and falling film evaporator shell side group sets up in the casing and its top lid has closed the aiutage, and falling film evaporator shell side group includes the even falling film evaporator shell side in the casing of a plurality of, the overflow annular cup joints in the aiutage top and is located the feed inlet below of casing, vapour and liquid separator sets up outside the casing, vapour and liquid separator's top and the import intercommunication on falling film evaporator shell side upper portion, and vapour and liquid separator bottom and the export intercommunication of falling film evaporator shell side bottom.
For the convenience of installation, the casing includes from last upper cover, barrel and the low head that connects gradually down.
In order to facilitate the feeding of dimethyl oxalate liquid, the feed inlet of casing goes out to be fixed with and receives the liquid dish, the overflow annular is connected with the feed inlet through receiving the liquid dish, overflow annular and receiving the liquid dish all set up in the upper cover.
In order to facilitate gas discharge, a gas discharge pipe is arranged at the top of the upper sealing head.
In order to facilitate installation, a first flange is installed at the top of the cylinder body, a second flange is installed at the bottom of the cylinder body, and the top and the bottom of the falling film evaporator shell pass group are installed in an upper seal head and a lower seal head of the cylinder body through the first flange and the second flange respectively.
In order to discharge condensed water conveniently, the top end of the gas-liquid separator is provided with a gas phase port, the bottom end of the gas-liquid separator is provided with a steam condensate outlet, and the gas phase port is communicated with an inlet at the upper part of the shell pass of the falling film evaporator through a steam pipe.
In order to facilitate observation and adjustment, the side wall of the bottom of the gas-liquid separator is connected with a liquid level meter interface.
The utility model has the advantages that: the dimethyl oxalate falling-film evaporator for synthesizing the oxamide can change the heating rate by adjusting the liquid level of the steam condensate in the gas-liquid separator, thereby changing the evaporation rate of the dimethyl oxalate, achieving the purposes of adjusting and adjusting the purity and the productivity of the oxamide, and having simple structure, low manufacturing cost, convenient operation and good effect.
Drawings
FIG. 1 is a schematic structural diagram of a dimethyl oxalate falling film evaporator for synthesizing oxamide;
FIG. 2 is a schematic structural diagram of the shell side of a falling-film evaporator of a dimethyl oxalate falling-film evaporator for synthesizing oxamide;
FIG. 3 is a schematic view of an assembly structure of a cylinder body, an exhaust funnel, a liquid receiving disc and an overflow ring groove of a dimethyl oxalate falling-film evaporator for synthesizing oxamide;
in the figure: 11. an upper end enclosure; 111. a discharge pipe; 12. a barrel; 13. a lower end enclosure; 14. a feed inlet; 15. a discharge port; 16. a nitrogen inlet; 17. a liquid receiving plate; 18. a first flange; 19. a second flange; 2. an overflow ring groove; 3. a shell pass of the falling film evaporator; 31. an air inlet; 32. a bracket inclined hole; 4. a gas-liquid separator; 41. a gas phase port; 42. a vapor condensate outlet; 43. a liquid level meter interface; 44. a steam pipe; 45. a liquid outlet; 5. an exhaust funnel.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be clearly and clearly defined. In the present invention, directional terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc. refer to directions of the attached drawings only. Accordingly, the directional terms used are used for describing and understanding the present invention, and are not used for limiting the present invention.
As shown in fig. 1-3, a dimethyl oxalate falling film evaporator for synthesizing oxamide, including casing, overflow annular 2, falling film evaporator shell side 3 group and vapour and liquid separator 4, the casing top has feed inlet 14 and its bottom is equipped with discharge gate 15 and nitrogen gas import 16, the casing includes from last upper cover 11, barrel 12 and the low head 13 that connects gradually down, upper cover 11 top is equipped with gas discharging pipe 111, the feed inlet 14 play of casing is fixed with by liquid dish 17, overflow annular 2 is connected with feed inlet 14 through by liquid dish 17, first flange 18 is installed at barrel 12 top and second flange 19 is installed to its bottom, the top and the bottom of falling film evaporator shell side group are installed in upper cover 11 and low head 13 of barrel 12 through first flange 18 and second flange 19 respectively, overflow annular 2 and liquid dish 17 all set up in upper cover 11, falling-film evaporator shell side 3 group sets up in the casing and its top lid has closed aiutage 5, and falling-film evaporator shell side 3 group includes that a plurality of is even at falling-film evaporator shell side 3 in the casing, and falling-film evaporator shell side 3 is including last pipe box and the lower pipe box of dismantling connection and interference fit, and falling-film evaporator shell side 3 top has inlet port 31 and has support inclined hole 32 on its middle part lateral wall, and each falling-film evaporator shell side 3 is fixed on support inclined hole 32 through the support interlude, overflow annular 2 cup joints in the aiutage 5 top and is located the feed inlet 14 below of casing, vapour and liquid separator 4 sets up outside the casing, and the top of vapour and liquid separator 4 and the import on falling-film evaporator shell side upper portion communicate, and vapour and liquid separator 4 bottom and falling-film evaporator shell side bottom export intercommunication, vapour and liquid separator 4 top is equipped with gas phase mouth 41 and its bottom is equipped, the gas phase port 41 is communicated with an inlet at the upper part of the shell pass of the falling film evaporator through a steam pipe 44, the side wall of the bottom of the gas-liquid separator 4 is connected with a liquid level meter port 43, a liquid outlet 45 is arranged at one side of the gas-liquid separator 4 close to the shell, and the liquid outlet 45 is communicated with an outlet at the bottom of the shell pass of the falling film evaporator.
The working principle is as follows: dimethyl oxalate liquid sequentially enters a liquid receiving disc 17 and an overflow ring groove 2 from a feed port 14 of a shell, the dimethyl oxalate liquid is gradually increased, overflows from the overflow ring groove 2 and then flows down to an exhaust funnel 5 along the outer wall of the exhaust funnel 5, liquid inlet control 32 of a shell pass 3 of the falling-film evaporator enters, and the liquid flows down along the inner wall of the shell pass 3 of the falling-film evaporator after entering the shell pass 3 of the falling-film evaporator and forms a liquid film. Nitrogen enters the shell pass 3 of the falling-film evaporator from the pipe orifice and then enters the inner wall of the shell pass 3 of the falling-film evaporator, and flows upwards along the center of the shell pass 3 of the falling-film evaporator; external steam enters the shell side of the falling film evaporator from the pipe orifice, and provides heat for dimethyl oxalate liquid through a heat exchange pipe to evaporate the dimethyl oxalate. The steam after providing heat is condensed into steam condensate and is discharged from the bottom opening of the shell pass 3 of the falling film evaporator. Because the upper part and the lower part of the shell pass 3 of the falling-film evaporator are both communicated with the gas-liquid separator 4 through pipelines, when the liquid level of the gas-liquid separator 4 rises, the liquid level of the steam condensate of the shell pass 3 of the falling-film evaporator also rises, and the heat transfer coefficient of the liquid phase of the steam condensate is smaller than that of steam, therefore, the heat transfer quantity of the falling-film evaporator can be correspondingly changed by changing the liquid level of the steam condensate of the gas-liquid separator 44, and the evaporation rate of dimethyl oxalate is also changed. More specifically, the higher the level of the steam condensate in the gas-liquid separator 4, the smaller the heat supply rate of the falling film evaporator shell side 3 and the smaller the evaporation rate of dimethyl oxalate; the lower the level of the steam condensate in the gas-liquid separator 4, the higher the heat supply rate of the shell side 3 of the falling film evaporator and the higher the evaporation rate of the dimethyl oxalate. Therefore, by controlling the level of the steam condensate of the gas-liquid separator 4, the evaporation rate of dimethyl oxalate can be adjusted, and the capacity of oxamide can be adjusted.
Compared with the prior art, the dimethyl oxalate falling-film evaporator for synthesizing oxamide can change the heating rate by adjusting the liquid level of the steam condensate in the gas-liquid separator, thereby changing the evaporation rate of dimethyl oxalate and achieving the purpose of adjusting and adjusting the productivity of oxamide, and has the advantages of simple structure, low manufacturing cost, convenient operation and good effect.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (7)
1. A dimethyl oxalate falling film evaporator for synthesizing oxamide is characterized in that: including casing, overflow annular (2), falling film evaporator shell side group and vapour and liquid separator (4), the casing top has feed inlet (14) and its bottom and is equipped with discharge gate (15) and nitrogen gas import (16), and falling film evaporator shell side group sets up in the casing and its top lid has closed aiutage (5), and falling film evaporator shell side group includes that a plurality of is even in falling film evaporator shell side (3) of casing, overflow annular (2) cup joint in aiutage (5) top and lie in feed inlet (14) below of casing, vapour and liquid separator (4) set up outside the casing, the top of vapour and liquid separator (4) and the import intercommunication on falling film evaporator shell side upper portion, and export intercommunication bottom vapour and liquid separator (4) and falling film evaporator shell side.
2. The dimethyl oxalate falling film evaporator for synthesizing oxamide according to claim 1, wherein: the shell comprises an upper end enclosure (11), a cylinder body (12) and a lower end enclosure (13) which are sequentially connected from top to bottom.
3. The dimethyl oxalate falling film evaporator for synthesizing oxamide as claimed in claim 2, wherein: feed inlet (14) play of casing is fixed with and receives liquid dish (17), overflow annular (2) are connected with feed inlet (14) through receiving liquid dish (17), overflow annular (2) and receive liquid dish (17) and all set up in upper cover (11).
4. The dimethyl oxalate falling film evaporator for synthesizing oxamide as claimed in claim 2, wherein: and a gas discharging pipe (111) is arranged at the top of the upper sealing head (11).
5. The dimethyl oxalate falling film evaporator for synthesizing oxamide as claimed in claim 2, wherein: the top of the barrel (12) is provided with a first flange (18) and the bottom of the barrel is provided with a second flange (19), and the top and the bottom of the shell pass group of the falling film evaporator are respectively arranged in an upper seal head (11) and a lower seal head (13) of the barrel (12) through the first flange (18) and the second flange (19).
6. The dimethyl oxalate falling film evaporator for synthesizing oxamide according to claim 1, wherein: the top end of the gas-liquid separator (4) is provided with a gas phase port (41) and the bottom end of the gas-liquid separator is provided with a steam condensate outlet (42), and the gas phase port (41) is communicated with an inlet at the upper part of the shell pass of the falling film evaporator through a steam pipe (44).
7. The dimethyl oxalate falling film evaporator for synthesizing oxamide according to claim 1, wherein: the side wall of the bottom of the gas-liquid separator (4) is connected with a liquid level meter interface (43).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922168334.0U CN211189150U (en) | 2019-12-06 | 2019-12-06 | Dimethyl oxalate falling film evaporator for synthesizing oxamide |
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| CN201922168334.0U CN211189150U (en) | 2019-12-06 | 2019-12-06 | Dimethyl oxalate falling film evaporator for synthesizing oxamide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110772820A (en) * | 2019-12-06 | 2020-02-11 | 东华工程科技股份有限公司 | Dimethyl oxalate falling film evaporator for synthesizing oxamide |
| CN115756031A (en) * | 2022-10-12 | 2023-03-07 | 东方电气集团东方汽轮机有限公司 | Control method and system for wound-tube evaporator |
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2019
- 2019-12-06 CN CN201922168334.0U patent/CN211189150U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110772820A (en) * | 2019-12-06 | 2020-02-11 | 东华工程科技股份有限公司 | Dimethyl oxalate falling film evaporator for synthesizing oxamide |
| CN115756031A (en) * | 2022-10-12 | 2023-03-07 | 东方电气集团东方汽轮机有限公司 | Control method and system for wound-tube evaporator |
| CN115756031B (en) * | 2022-10-12 | 2023-10-10 | 东方电气集团东方汽轮机有限公司 | Method and system for controlling coiled tube evaporator |
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