System for recovering ethylene glycol in heavy alcohol material

Abstract

The utility model provides a system for recovering ethylene glycol in a heavy alcohol material, which belongs to the technical field of ethylene glycol recovery and comprises a light component removal tower, a heavy component removal tower, a vacuumizing device, a product recovery device and a heavy component impurity treatment device, the light component removal tower is connected with a front-end heavy alcohol material liquid supply device through a feeding pipeline; a light component removal tower top condenser is arranged at the top of the light component removal tower; a de-heavy tower top condenser is arranged at the top of the de-heavy tower; the light component removal overhead condenser and the heavy component removal overhead condenser are connected with a vacuumizing device through an output pipeline; according to the utility model, three output lines are arranged, so that light components, ethylene glycol (EG, DEG and TEG) and heavy components can be respectively recovered and treated through the vacuumizing device, the product recovery device and the heavy component impurity treatment device after heavy alcohol materials are separated and purified; the ethylene glycol in the recovered heavy alcohol is improved, and the economic loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ethylene glycol recovery, in particular to an ethylene glycol recovery system in heavy alcohol materials. Background Art

[0002] In the existing production system, the T-3102 ethylene glycol unit in the bottom of the tower discharges 1.8 t / h. The bottom material composition is 10% ethylene glycol, 80% diethylene glycol, 8% triethylene glycol, and 2% other heavy components. This system directly discharges the ethylene glycol without further purification or recovery, significantly reducing the ethylene glycol yield and causing economic losses. Utility Model Content

[0003] The utility model provides a system for recovering ethylene glycol from heavy alcohol materials, which solves the problem of heavy alcohol materials being discharged as waste materials in large quantities in existing recovery systems, and simultaneously solves the problem of recovering ethylene glycol from heavy alcohol materials.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A system for recovering ethylene glycol from heavy alcohol materials comprises: a light-removal column, a heavy-removal column, a front-end heavy alcohol material liquid supply device, a vacuum pumping device, a product recovery device, and a heavy component impurity processing device; the light-removal column is connected to the front-end heavy alcohol material liquid supply device via a feed pipeline; a light-removal column top condenser is provided at the top of the light-removal column; the top of the light-removal column top condenser is connected to the vacuum pumping device via an output pipeline, forming a first output line;

[0006] The bottom of the light-removal tower is connected to the light-removal tower bottom reboiler through a circulation pipeline; the upper part of the light-removal tower is connected to the light-removal tower extraction tank through an output pipeline; the light-removal tower extraction tank is connected to the feed end of the impurity tank through an output pipeline; the output end of the impurity tank is connected to the heavy component impurity processing device through an output pipeline, forming a second output line;

[0007] The light removal tower is connected to the heavy removal tower through a transmission pipeline; a heavy removal tower top condenser is provided on the top of the heavy removal tower; the bottom of the heavy removal tower is connected to the heavy removal tower bottom reboiler through a circulation pipeline; the upper part of the heavy removal tower is connected to the heavy removal tower extraction tank through an output pipeline; the heavy removal tower extraction tank is connected to the product tank through an output pipeline; the product tank is connected to the product recovery device through the output pipeline to form an ethylene glycol recovery line.

[0008] Furthermore, the deweighting tower top condenser is connected to the output pipeline at the front end of the vacuum pumping device through an output pipeline.

[0009] Furthermore, a light-removal tower bottom delivery pump is provided on the delivery pipeline between the light-removal tower and the heavy-removal tower.

[0010] Furthermore, the bottom of the deweighting tower is connected to the output pipeline at the front end of the impurity tank through an output pipeline; a deweighting tower bottom delivery pump is provided on the output pipeline between the bottom of the deweighting tower and the impurity tank.

[0011] Furthermore, a de-lightening tower bottom circulation pump is provided on the circulation pipeline between the de-lightening tower and the de-lightening tower bottom reboiler; a de-lightening tower extraction condenser is provided on the output pipeline between the de-lightening tower and the de-lightening tower extraction tank; a de-lightening tower extraction pump is provided on the output pipeline between the de-lightening tower extraction tank and the impurity tank; and an impurity delivery pump is provided on the output pipeline between the impurity tank and the heavy component impurity processing device.

[0012] Furthermore, a weight removal tower bottom circulation pump is provided on the circulation pipeline between the weight removal tower and the weight removal tower bottom reboiler; a weight removal tower extraction condenser is provided on the output pipeline between the weight removal tower and the weight removal tower extraction tank; a weight removal tower extraction pump is provided on the output pipeline between the weight removal tower extraction tank and the product tank; and a product delivery pump is provided on the output pipeline between the product tank and the product recovery device.

[0013] Furthermore, the top pressure of the lightness removal tower 1 is 2-4 KPa·A, the top temperature is 99.5-100.5°C, and the bottom temperature is 146.5-147.5°C.

[0014] Furthermore, the top pressure of the deweighting tower 7 is 2-4 KPa·A, the top temperature is 141.5-142.5° C., and the bottom temperature is 173.5-174.5° C.

[0015] The beneficial effects of the present invention are:

[0016] The utility model can effectively solve the problem of large-scale discharge of heavy alcohol materials in the recovery system, and through the structural design of arranging double-tower multiple separation and purification lines, the recovery of ethylene glycol in heavy alcohol is improved, and economic losses are reduced.

[0017] The utility model sets three output lines so that after the heavy alcohol material is separated and purified, the light components, ethylene glycol (EG, DEG, TEG) and heavy components can be recovered and processed respectively through a vacuum device, a product recovery device and a heavy component impurity processing device.

[0018] The utility model provides multiple circulation pumps to process the liquid material conveying of the system, thereby greatly improving the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is an overall schematic diagram of the utility model.

[0021] Description of Figure Numbers:

[0022] 1. Light-removal tower; 2. Condenser at the top of light-removal tower; 3. Reboiler at the bottom of light-removal tower; 4. Extraction condenser at the light-removal tower; 5. Extraction tank at the light-removal tower; 6. Impurity tank; 7. Heavy-removal tower; 8. Condenser at the top of heavy-removal tower; 9. Reboiler at the bottom of heavy-removal tower; 10. Extraction condenser at the heavy-removal tower; 11. Extraction tank at the heavy-removal tower; 12. Product tank; 13. Front-end heavy alcohol material liquid supply device; 14. Vacuum pumping device; 15. Product recovery device; 16. Heavy component impurity processing device; 101. Delivery pump at the bottom of light-removal tower; 102. Circulation pump at the bottom of light-removal tower; 103. Extraction pump at the light-removal tower; 104. Impurity delivery pump; 701. Circulation pump at the bottom of heavy-removal tower; 702. Circulation pump at the bottom of heavy-removal tower; 703. Extraction pump at the heavy-removal tower; 704. Product delivery pump. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0027] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0030] The utility model provides a technical solution: a system for recovering ethylene glycol from heavy alcohol materials, such as Figure 1 As shown, it includes: a light-removal column 1, a heavy-removal column 7, a front-end heavy alcohol material feeding device 13, a vacuum pumping device 14, a product recovery device 15 and a heavy component impurity processing device 16; the light-removal column 1 is connected to the front-end heavy alcohol material feeding device 13 through a feed pipeline; a light-removal column top condenser 2 is provided on the top of the light-removal column 1; the top of the light-removal column top condenser 2 is connected to the vacuum pumping device 14 through an output pipeline, forming a first output line;

[0031] The bottom of the light removal tower 1 is connected to the light removal tower bottom reboiler 3 through a circulation pipeline; the upper part of the light removal tower 1 is connected to the light removal tower extraction tank 5 through an output pipeline; the light removal tower extraction tank 5 is connected to the feed end of the impurity tank 6 through an output pipeline; the output end of the impurity tank 6 is connected to the heavy component impurity processing device 16 through an output pipeline, forming a second output line;

[0032] The light removal tower 1 is connected to the weight removal tower 7 through a transmission pipeline; a weight removal tower top condenser 8 is provided on the top of the weight removal tower 7; the bottom of the weight removal tower 7 is connected to the weight removal tower bottom reboiler 9 through a circulation pipeline; the upper part of the weight removal tower 7 is connected to the weight removal tower extraction tank 11 through an output pipeline; the weight removal tower extraction tank 11 is connected to the product tank 12 through an output pipeline; the product tank 12 is connected to the product recovery device 15 through an output pipeline to form an ethylene glycol recovery circuit.

[0033] The deweighting tower top condenser 8 is connected to the output pipeline at the front end of the vacuum pumping device 14 through an output pipeline.

[0034] A light removal tower bottom delivery pump 101 is provided on the delivery pipeline between the light removal tower 1 and the heavy removal tower 7 .

[0035] The bottom of the deweighting tower 7 is connected to the output pipeline at the front end of the impurity tank 6 through an output pipeline; a deweighting tower bottom delivery pump 701 is provided on the output pipeline between the bottom of the deweighting tower 7 and the impurity tank 6.

[0036] A de-lightening tower bottom circulation pump 102 is provided on the circulation pipeline between the de-lightening tower 1 and the de-lightening tower bottom reboiler 3; a de-lightening tower extraction condenser 4 is provided on the output pipeline between the de-lightening tower 1 and the de-lightening tower extraction tank 5; a de-lightening tower extraction pump 103 is provided on the output pipeline between the de-lightening tower extraction tank 5 and the impurity tank 6; an impurity delivery pump 104 is provided on the output pipeline between the impurity tank 6 and the heavy component impurity processing device 16.

[0037] The circulation pipeline between the deweighting tower 7 and the deweighting tower bottom reboiler 9 is provided with a deweighting tower bottom circulation pump 702; the output pipeline between the deweighting tower 7 and the deweighting tower extraction tank 11 is provided with a deweighting tower extraction condenser 10; the output pipeline between the deweighting tower extraction tank 11 and the product tank 12 is provided with a deweighting tower extraction pump 703; the output pipeline between the product tank 12 and the product recovery device 15 is provided with a product delivery pump 704.

[0038] The top pressure of the lightness removal tower 1 is 2-4 KPa·A, the top temperature is 99.5-100.5°C, and the bottom temperature is 146.5-147.5°C.

[0039] The top pressure of the deweighting tower 7 is 2-4 KPa·A, the top temperature is 141.5-142.5°C, and the bottom temperature is 173.5-174.5°C.

[0040] The utility model discloses an ethylene glycol recovery system in heavy alcohol materials, which leads the solution in the bottom of an ethylene glycol refining tower to a light-removal and heavy-removal distillation tower, and distills the solution in the bottom of the ethylene glycol refining tower to separate light components, ethylene glycol (EG, DEG, TEG) and heavy components.

[0041] The implementation method of the utility model is as follows:

[0042] 1. The heavy alcohol material is transported to the light alcohol removal tower 1 through the feed line through the front-end heavy alcohol material feeding device 13. The heavy alcohol material in the light alcohol removal tower is circulated through the light alcohol removal tower bottom circulation pump 102 and the light alcohol removal tower bottom reboiler 3. The light components at the top of the light alcohol removal tower 1 are vacuumed and separated through the light alcohol removal tower top condenser 2 connected to the vacuum device 14;

[0043] 2, the heavy component impurities in the light-removing tower 1 are transported to the light-removing tower product tank 5 through the light-removing tower product condenser 4, and then output to the impurity tank 6 through the light-removing tower product pump 103, and finally discharged to the heavy component impurity treatment device 16 through the impurity delivery pump 104;

[0044] 3, the material at the bottom of the light-removing tower 1 is transported to the heavy-removing tower 7 through the light-removing tower bottom delivery pump, the material at the bottom of the heavy-removing tower 7 is circulated in the heavy-removing tower 7 through the heavy-removing tower bottom circulation pump 702 and the heavy-removing tower bottom reboiler 9, and the light components at the top of the heavy-removing tower 7 are separated again through the heavy-removing tower top condenser 8 and the vacuumizing device 14;

[0045] 4, the ethylene glycol (EG, DEG, TEG) product in the heavy-removing tower 7 is transported to the heavy-removing tower product tank 11 through the heavy-removing tower product condenser 10, and then transported to the product tank 12 through the heavy-removing tower product pump 703, and finally output to the product recovery device 15 through the product delivery pump 704;

[0046] 5, the heavy component impurities at the bottom of the heavy-removing tower 7 are output to the impurity tank 6 through the heavy-removing tower bottom delivery pump 701, and finally discharged to the heavy component impurity treatment device 16 through the impurity delivery pump 104.

[0047] The above is only the preferred specific implementation mode of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A system for recovering ethylene glycol from heavy alcohol materials, characterized in that: include: A light-removal tower (1), a heavy-removal tower (7), a front-end heavy alcohol material liquid supply device (13), a vacuum pumping device (14), a product recovery device (15) and a heavy component impurity processing device (16); the light-removal tower (1) is connected to the front-end heavy alcohol material liquid supply device (13) via a feed pipeline; a light-removal tower top condenser (2) is provided at the top of the light-removal tower (1); the top of the light-removal tower top condenser (2) is connected to the vacuum pumping device (14) via an output pipeline, forming a first output circuit; The bottom of the light-removal tower (1) is connected to the light-removal tower bottom reboiler (3) via a circulation pipeline; the upper part of the light-removal tower (1) is connected to the light-removal tower extraction tank (5) via an output pipeline; the light-removal tower extraction tank (5) is connected to the feed end of the impurity tank (6) via an output pipeline; the output end of the impurity tank (6) is connected to the heavy component impurity processing device (16) via an output pipeline, forming a second output circuit; The light removal tower (1) is connected to the heavy removal tower (7) through a transmission pipeline; a heavy removal tower top condenser (8) is provided on the top of the heavy removal tower (7); the bottom of the heavy removal tower (7) is connected to the heavy removal tower bottom reboiler (9) through a circulation pipeline; the upper part of the heavy removal tower (7) is connected to the heavy removal tower extraction tank (11) through an output pipeline; the heavy removal tower extraction tank (11) is connected to the product tank (12) through an output pipeline; the product tank (12) is connected to the product recovery device (15) through the output pipeline to form an ethylene glycol recovery line.

2. The system for recovering ethylene glycol from heavy alcohol materials according to claim 1, characterized in that: The deweighting tower top condenser (8) is connected to the output pipeline at the front end of the vacuum pumping device (14) through an output pipeline.

3. The system for recovering ethylene glycol from heavy alcohol materials according to claim 1, characterized in that: A light-removal tower bottom delivery pump (101) is provided on the delivery pipeline between the light-removal tower (1) and the heavy-removal tower (7).

4. The system for recovering ethylene glycol from heavy alcohol materials according to claim 1, characterized in that: The bottom of the deweighting tower (7) is connected to the output pipeline at the front end of the impurity tank (6) through an output pipeline; a deweighting tower bottom delivery pump (701) is provided on the output pipeline between the bottom of the deweighting tower (7) and the impurity tank (6).

5. The system for recovering ethylene glycol from heavy alcohol materials according to claim 1, characterized in that: A delightening tower bottom circulation pump (102) is provided on the circulation pipeline between the delightening tower (1) and the delightening tower bottom reboiler (3); a delightening tower extraction condenser (4) is provided on the output pipeline between the delightening tower (1) and the delightening tower extraction tank (5); a delightening tower extraction pump (103) is provided on the output pipeline between the delightening tower extraction tank (5) and the impurity tank (6); and an impurity delivery pump (104) is provided on the output pipeline between the impurity tank (6) and the heavy component impurity processing device (16).

6. The system for recovering ethylene glycol from heavy alcohol materials according to claim 1, characterized in that: The circulation pipeline between the deweighting tower (7) and the deweighting tower bottom reboiler (9) is provided with a deweighting tower bottom circulation pump (702); the output pipeline between the deweighting tower (7) and the deweighting tower extraction tank (11) is provided with a deweighting tower extraction condenser (10); the output pipeline between the deweighting tower extraction tank (11) and the product tank (12) is provided with a deweighting tower extraction pump (703); the output pipeline between the product tank (12) and the product recovery device (15) is provided with a product delivery pump (704).

7. The system for recovering ethylene glycol from heavy alcohol materials according to claim 1, characterized in that: The top pressure of the light removal tower (1) is 2-4 KPa·A, the top temperature is 99.5-100.5°C, and the bottom temperature is 146.5-147.5°C.

8. The system for recovering ethylene glycol from heavy alcohol materials according to claim 1, characterized in that: The top pressure of the deweighting tower (7) is 2-4 KPa·A, the top temperature is 141.5-142.5°C, and the bottom temperature is 173.5-174.5°C.

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