CN214415632U - Trimethyl orthoacetate crude product continuous rectification device - Google Patents
Trimethyl orthoacetate crude product continuous rectification device Download PDFInfo
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- CN214415632U CN214415632U CN202022706202.1U CN202022706202U CN214415632U CN 214415632 U CN214415632 U CN 214415632U CN 202022706202 U CN202022706202 U CN 202022706202U CN 214415632 U CN214415632 U CN 214415632U
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Abstract
The utility model provides a trimethyl orthoacetate crude product continuous rectification device, belong to rectification equipment technical field, this continuous rectification device, including distillation column cauldron and thermosiphon reboiler, the upper portion inner wall of distillation column cauldron is provided with the toper baffle along its circumference, the below of toper baffle is provided with the liquid collecting pipe of cladding its periphery, the liquid collecting pipe divides the distillation column cauldron into cylindricality circulation zone and annular extraction zone, the bottom in cylindricality circulation zone is through circulating drain pipe and thermosiphon reboiler's feed inlet to link to each other, thermosiphon reboiler's discharge gate passes through circulating feed liquor pipe and links to each other with the upper portion in annular extraction zone, the lower part in annular extraction zone passes through the product extraction pipe and links to each other with the product jar, the beneficial effects of the utility model are that, the utility model discloses a continuous rectification purification to trimethyl orthoacetate crude product, the separation purification effect is better, the separation efficiency of material has been improved, the material heating section dwell time in the distillation column cauldron is short, scaling is not easy to occur, and the stable operation of the thermosiphon reboiler and the distillation tower kettle is ensured.
Description
Technical Field
The utility model relates to a rectification equipment technical field especially relates to a trimethyl orthoacetate crude continuous rectification device.
Background
The synthesized crude trimethyl orthoacetate product comprises trimethyl orthoacetate, methyl acetate, methanol, acetonitrile and kerosene, contains light components and heavy components, and the heavy components are collected in a rectification mode to achieve the purpose of purification. The traditional rectification method adopts a kettle type rectification method, namely a jacketed glass lining reaction kettle or a stainless steel reaction kettle is used for heating, and the method is an intermittent production method, and the product is collected after the heating is stopped at intervals, so that the defects of huge energy consumption waste, large operation difficulty, unstable product content and large occupied area exist. In order to overcome some defects of batch production, a continuous rectification process is required, however, the existing continuous rectification process adopts a traditional kettle reboiler, and still has the defects that the retention time of materials in a tower kettle is long, the temperature of the tower kettle is high, high boiling point products such as kerosene in the tower kettle are easy to coke, and the like.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a trimethyl orthoacetate crude continuous rectification device adopts the mode that thermosyphon reboiler and distillation column cauldron link to each other to realize the continuous rectification purification to trimethyl orthoacetate crude, provides required steam volume that rises for the distillation column cauldron, improves through to distillation column cauldron inner structure, makes the separation efficiency of material high, and it is short to add hot section dwell time at the distillation column cauldron, and heating temperature is low, difficult scale deposit.
In order to achieve the above object, the present invention provides a technical solution for solving the technical problem: the continuous rectification device for the crude trimethyl orthoacetate comprises a distillation tower kettle and a thermosiphon reboiler, wherein a conical baffle used for collecting liquid at a downcomer of an upper layer of a tower plate is arranged on the inner wall of the upper part of the distillation tower kettle along the circumferential direction of the distillation tower kettle, a liquid collecting pipe for coating the periphery of the conical baffle is arranged below the conical baffle, the distillation tower kettle is divided into a cylindrical circulation zone and an annular extraction zone by the liquid collecting pipe, the bottom of the cylindrical circulation zone is connected with a feed inlet of the thermosiphon reboiler through a circulation liquid outlet pipe, a discharge outlet of the thermosiphon reboiler is connected with the upper part of the annular extraction zone through a circulation liquid inlet pipe, and the lower part of the annular extraction zone is connected with a product tank through a product extraction pipe.
Further, the liquid collecting pipe comprises a flaring section and a vertical section connected with the lower end of the flaring section, the flaring section is arranged below the conical baffle, the upper end port of the flaring section coats the outlet of the conical baffle, and the vertical section is fixedly connected with the middle part of the lower end of the distillation tower kettle.
Furthermore, the upper part of the vertical section is provided with a communication hole which communicates the cylindrical circulation zone with the annular extraction zone.
Further, the lower end of the vertical section is provided with a wire mesh demister.
Further, the distillation tower kettle is provided with a plurality of groups of liquid level control components I along the height direction of the distillation tower kettle, each liquid level control component I comprises two liquid level control valves I and a field liquid level meter I, an upper liquid inlet of the field liquid level meter I is connected with the annular extraction area through a liquid inlet pipe I, a lower liquid inlet of the field liquid level meter I is connected with the annular extraction area through a liquid inlet pipe II, and the liquid level control valves I are respectively arranged in the liquid inlet pipe I and the liquid inlet pipe II.
Furthermore, the on-site liquid level meter I is connected with the liquid level control valve I through a remote liquid level controller.
Furthermore, an inlet valve is arranged in the circulating liquid inlet pipe, an adjusting valve and a liquid discharge valve are arranged in the product extraction pipe, and a communication valve is connected between the circulating liquid outlet pipe and the product extraction pipe.
The utility model has the advantages that:
1. the utility model discloses a liquid material of upper strata column plate downcomer department is collected to the toper baffle on distillation column cauldron upper portion, the liquid collecting pipe of collecting through the below is concentrated to be collected in succession and is heated and carry out the vapour-liquid separation in the thermosyphon reboiler, the vapour-liquid mixture that flows out gets into the distillation column cauldron in by the thermosyphon reboiler, liquid phase after the flash distillation gets into and collects after the annular is adopted the district, touch the toper baffle after the vapour phase rises, continue to follow the liquid collecting pipe of below under the water conservancy diversion effect of toper baffle in, continue to be separated once more in the leading-in thermosyphon reboiler, the circulation separation purification of material has been realized, the effect that makes the separation purification is better, the separation efficiency of material has been improved, the material is short in the heating section dwell time of distillation column cauldron, heating temperature is low, difficult scale deposit.
2. The utility model discloses a direction of height along the distillation column cauldron sets up liquid level control part I that the multiunit comprises two liquid level control valve I and on-the-spot level gauge I, on-the-spot level gauge I gives remote liquid level controller with real-time liquid level information transmission in the distillation column cauldron, remote liquid level controller controls the liquid level in the distillation column cauldron through control liquid level control valve I in suitable position, prevent that the liquid level in the distillation column cauldron is low excessively and produce the problem of dry combustion method, the liquid level in the distillation column cauldron has also been prevented simultaneously too high and the distillation column cauldron overload rectification appears and influences the problem of distillation column cauldron normal operating.
3. The utility model discloses a connect the intercommunication valve between circulation drain pipe and product extraction pipe, set up the flowing back valve in the product extraction pipe, when thermosiphon reboiler just begins the operation, through opening the intercommunication valve and closing the flowing back valve, let in liquid material in to the distillation column cauldron, make the liquid material in annular extraction district and the cylindricality circulation district wherein all simultaneously leading-in thermosiphon reboiler, can make the thermosiphon reboiler produce the required steam quantity that rises of distillation column cauldron fast, can satisfy the interior liquid of distillation column cauldron and the balance between the intraductal double-phase mixture pressure differential of thermosiphon reboiler and the pressure drop again, the fast and stable operation of thermosiphon reboiler has been guaranteed, close the intercommunication valve during normal operating, the flowing back valve is opened can.
In conclusion, the continuous rectification device adopts the mode that the thermosiphon reboiler is connected with the distillation tower kettle to realize the continuous rectification and purification of the crude trimethyl orthoacetate, the separation and purification effects are better, the separation efficiency of the materials is improved, the retention time of the materials in the heating section of the distillation tower kettle is short, the heating temperature is low, scaling is not easy to occur, and the stable operation of the thermosiphon reboiler and the distillation tower kettle is ensured.
Drawings
The contents of the various figures of the specification and the labels in the figures are briefly described as follows:
fig. 1 is a schematic structural view of the present invention;
the labels in the above figures are: 1. the system comprises a distillation tower kettle, 2. a thermosiphon reboiler, 3. an upper-layer tower plate downcomer, 4. a conical baffle, 5. a liquid collecting pipe, 51. an opening expanding section, 52. a vertical section, 53. a communicating hole, 6. a cylindrical circulating area, 7. an annular extracting area, 8. a circulating liquid outlet pipe, 9. a circulating liquid inlet pipe, 10. a product extracting pipe, 11. a wire mesh demister, 12. a liquid level control part I, 121. a liquid level control valve I, 122. an on-site liquid level meter I, 13. a remote liquid level controller, 14. an inlet valve, 15. an adjusting valve, 16. a liquid discharge valve and 17. a communicating valve.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments, and the following embodiments are used for illustrating the present invention, but do not limit the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The utility model discloses specific embodiment does: as shown in figure 1, a trimethyl orthoacetate crude product continuous rectification device comprises a distillation tower kettle 1 and a thermosiphon reboiler 2, wherein a conical baffle 4 for collecting liquid at an upper-layer tower plate downcomer 3 is arranged on the inner wall of the upper part of the distillation tower kettle 1 along the circumferential direction of the distillation tower kettle, a liquid collecting pipe 5 for coating the outer circumference of the conical baffle 4 is arranged below the conical baffle 4, the distillation tower kettle 1 is divided into a cylindrical circulation zone 6 and an annular extraction zone 7 by the liquid collecting pipe 5, the bottom of the cylindrical circulation zone 6 is connected with a feed inlet of the thermosiphon reboiler 2 through a circulation liquid outlet pipe 8, a discharge outlet of the thermosiphon reboiler 2 is connected with the upper part of the annular extraction zone 7 through a circulation liquid inlet pipe 9, and the lower part of the annular extraction zone 7 is connected with a product tank through a product extraction pipe 10. The utility model collects the liquid material at the downcomer 3 of the upper tower plate by the cone-shaped baffle 4 at the upper part of the distillation tower kettle 1, the collected material is intensively and continuously collected in the thermosiphon reboiler 2 through the liquid collecting pipe 5 at the lower part to be heated for vapor-liquid separation, the vapor-liquid mixture flowing out from the thermosiphon reboiler 2 enters the distillation tower kettle 1, the liquid phase after flash evaporation enters the annular extraction area 7 to be collected, the vapor phase touches the cone-shaped baffle 4 after rising, the vapor phase continuously flows into the liquid collecting pipe 5 at the lower part under the flow guide effect of the cone-shaped baffle 4 to be separated again after being guided into the thermosiphon reboiler 2, the separated liquid phase enters the product tank through the product extraction pipe 10 to be collected, the circular separation and purification of the material are realized, the separation and purification effect is better, the separation efficiency of the material is improved, the retention time of the material in the heating section of the distillation tower kettle is short, the heating temperature is low, and scaling is not easy to occur.
Specifically, the liquid collecting pipe 5 comprises a flared section 51 and a vertical section 52 connected with the lower end of the flared section 51, the flared section 51 is arranged below the conical baffle 4, the upper end port of the flared section 51 covers the outlet of the conical baffle 4 and is used for collecting the vapor phase which rises and touches the conical baffle 4, so that the separation is more sufficient, the vertical section 52 is fixedly connected with the middle part of the lower end of the distillation tower kettle 1 in a welding manner, the upper part of the vertical section 52 is provided with a communication hole 53 which communicates the cylindrical circulation zone 6 with the annular extraction zone 7 and is used for balancing the liquid level between the cylindrical circulation zone 6 and the annular extraction zone 7, the lower end of the vertical section 52 is also provided with a wire mesh demister 11, so that the situation that the flow speed of the material is reduced due to the generation of foam in the downward flow of the material is prevented, and the material can pass through the heating section of the distillation tower kettle more quickly.
Specifically, a plurality of groups of liquid level control components I12 are arranged in the distillation tower kettle 1 along the height direction of the distillation tower kettle, each liquid level control component I12 comprises two liquid level control valves I121 and a field liquid level meter I122, an upper liquid inlet of each field liquid level meter I122 is connected with an annular extraction area 7 through a liquid inlet pipe I, a lower liquid inlet of each field liquid level meter I122 is connected with the annular extraction area 7 through a liquid inlet pipe II, the liquid level control valves I121 are respectively arranged in the liquid inlet pipe I and the liquid inlet pipe II, the field liquid level meter I122 is connected with the liquid level control valves I121 through a remote liquid level controller 13, the field liquid level meter I122 transmits real-time liquid level information in the distillation tower kettle 1 to the remote liquid level controller 13, the remote liquid level controller 13 controls the liquid level in the distillation tower kettle 1 to be at a proper position by controlling the opening degrees of the two liquid level control valves I121, generally, the liquid level in the distillation tower kettle 1 is controlled to be about 2/3, the problem that the liquid level in the distillation tower kettle is too low to cause dry burning can be prevented, and the problem that the normal operation of the distillation tower kettle is influenced by the overload rectification of the distillation tower kettle due to the too high liquid level in the distillation tower kettle is also prevented.
Specifically, an inlet valve 14 is arranged in the circulating liquid inlet pipe 9 for controlling the discharge amount of the thermosiphon reboiler 2, an adjusting valve 15 and a liquid discharge valve 16 are arranged in the product extraction pipe 10, wherein the adjusting valve 15 is used for adjusting the discharge amount of the purified product, wherein the liquid discharge valve 16 is used for discharging the purified product into a product tank, a communication valve 17 is connected between the circulating liquid outlet pipe 8 and the product extraction pipe 10, the communication valve 17 and the liquid discharge valve 16 are in interlocking control, that is, the communication valve 17 is in a closed state when the liquid discharge valve 16 is opened, otherwise, the communication valve 17 is in an open state when the liquid discharge valve 16 is closed, when the thermosiphon reboiler 2 just starts to operate, liquid materials are introduced into the distillation tower kettle 1 by opening the communication valve 17 and closing the liquid discharge valve 16, so that the liquid materials in the annular extraction zone 7 and the cylindrical circulation zone 6 are both simultaneously introduced into the thermosiphon reboiler 2, the thermosiphon reboiler 2 can be rapidly enabled to generate the ascending steam amount required by the distillation tower kettle 1, the balance between the pressure difference and the pressure drop of the two-phase mixture in the liquid in the distillation tower kettle 1 and the heat exchange pipe of the thermosiphon reboiler 2 can be met, the rapid and stable operation of the thermosiphon reboiler 2 is ensured, the communication valve 17 is closed in normal operation, and the drain valve 16 is opened.
In addition, a group of thermometers and pressure gauges are respectively arranged at the positions of the distillation tower kettle 1 close to the conical baffle 4 and the upper part of the liquid collecting pipe 5 and are used for analyzing material components at different positions of the upper part of the distillation tower kettle 1.
In conclusion, the continuous rectification device adopts the mode that the thermosiphon reboiler is connected with the distillation tower kettle to realize the continuous rectification and purification of the crude trimethyl orthoacetate, the separation and purification effects are better, the separation efficiency of the materials is improved, the retention time of the materials in the heating section of the distillation tower kettle is short, the heating temperature is low, scaling is not easy to occur, and the stable operation of the thermosiphon reboiler and the distillation tower kettle is ensured.
The foregoing is merely illustrative of some of the principles of the present invention and the description is not intended to limit the invention to the specific constructions and applications shown, so that all modifications and equivalents that may be utilized are within the scope of the invention.
Claims (7)
1. A trimethyl orthoacetate crude product continuous rectification device is characterized by comprising a distillation tower kettle (1) and a thermosiphon reboiler (2), the inner wall of the upper part of the distillation tower kettle (1) is provided with a conical baffle (4) used for collecting liquid at the downcomer (3) of the upper layer of the tower plate along the circumferential direction, a liquid collecting pipe (5) which coats the periphery of the conical baffle plate (4) is arranged below the conical baffle plate, the liquid collecting pipe (5) divides the distillation tower kettle (1) into a cylindrical circulation area (6) and an annular extraction area (7), the bottom of the cylindrical circulating area (6) is connected with a feed inlet of the thermosiphon reboiler (2) through a circulating liquid outlet pipe (8), the discharge hole of the thermosiphon reboiler (2) is connected with the upper part of the annular extraction zone (7) through a circulating liquid inlet pipe (9), the lower part of the annular extraction zone (7) is connected with a product tank through a product extraction pipe (10).
2. The continuous rectification device for the crude trimethyl orthoacetate product according to claim 1, which is characterized in that: the liquid collecting pipe (5) comprises an expanding section (51) and a vertical section (52) connected with the lower end of the expanding section, the expanding section (51) is arranged below the conical baffle (4), the upper end port of the expanding section (51) coats the outlet of the conical baffle (4), and the vertical section (52) is fixedly connected with the middle part of the lower end of the distillation tower kettle (1).
3. The continuous rectification device for the crude trimethyl orthoacetate product according to claim 2, which is characterized in that: the upper part of the vertical section (52) is provided with a communicating hole (53) which communicates the cylindrical circulating area (6) with the annular extraction area (7).
4. The continuous rectification device for the crude trimethyl orthoacetate product according to claim 2, which is characterized in that: the lower end of the vertical section (52) is provided with a wire mesh demister (11).
5. The continuous rectification device for the trimethyl orthoacetate crude product according to any one of claims 1 to 4, characterized in that: distillation column cauldron (1) is provided with multiunit liquid level control part I (12) along its direction of height, liquid level control part I (12) are including two level control valve I (121) and on-the-spot level gauge I (122), the district (7) are adopted with the annular through feed liquor pipe I to the last inlet port of on-the-spot level gauge I (122) links to each other, district (7) are adopted with the annular through feed liquor pipe II to the lower inlet of on-the-spot level gauge I (122) link to each other, set up respectively in feed liquor pipe I and the feed liquor pipe II liquid level control valve I (121).
6. The continuous rectification device for the trimethyl orthoacetate crude product according to claim 5, wherein: and the field liquid level meter I (122) is connected with the liquid level control valve I (121) through a remote liquid level controller (13).
7. The continuous rectification device for the crude trimethyl orthoacetate product according to claim 1, which is characterized in that: an inlet valve (14) is arranged in the circulating liquid inlet pipe (9), an adjusting valve (15) and a liquid discharge valve (16) are arranged in the product extraction pipe (10), and a communicating valve (17) is connected between the circulating liquid outlet pipe (8) and the product extraction pipe (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022706202.1U CN214415632U (en) | 2020-11-20 | 2020-11-20 | Trimethyl orthoacetate crude product continuous rectification device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022706202.1U CN214415632U (en) | 2020-11-20 | 2020-11-20 | Trimethyl orthoacetate crude product continuous rectification device |
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| Publication Number | Publication Date |
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| CN214415632U true CN214415632U (en) | 2021-10-19 |
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| CN202022706202.1U Active CN214415632U (en) | 2020-11-20 | 2020-11-20 | Trimethyl orthoacetate crude product continuous rectification device |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A continuous distillation device for crude trimethyl acetate Effective date of registration: 20230904 Granted publication date: 20211019 Pledgee: Agricultural Bank of China Limited Dongzhi County Branch Pledgor: Anhui Xintai New Material Co.,Ltd. Registration number: Y2023980055122 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |