One-driving-two indirect heat pump rectification system

Abstract

The utility model discloses a one-with-two indirect heat pump rectification system, which comprises a light component removal tower and a product tower, an ester crude product is taken as a raw material and enters the light component removal tower firstly, a light component enters a light component removal tower return tank from the top of the light component removal tower through a light component removal tower condenser, and a part of the light component is returned and a part of the light component is extracted. Materials extracted from a tower kettle of the light component removal tower enter the product tower, water in a condenser of the product tower exchanges heat with materials at the tower top, absorbs heat and is evaporated into water vapor, the pressure and temperature of the water vapor are increased through a compressor, the water vapor is respectively sent to the tower kettle of the light component removal tower and the tower kettle of the product tower to heat kettle liquid, the water vapor is condensed into liquid, and the liquid returns to the condenser of the product tower after being throttled and decompressed. And heat at the low-temperature position of the tower top is transferred to the high-temperature position of the tower kettle through water. The device has the advantages that the cooling medium is water, the chemical and thermal stability of the water is good, the water has no negative effect on people and the ozone layer during leakage, the price is low, and the water has excellent heat transfer characteristic. And the one-two indirect heat pump rectification system is low in equipment investment and low in cost.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, specifically a one-to-two indirect heat pump distillation system. Background Technology

[0002] Electronic-grade esters mainly include carbonates, oxalates, and acetates. With the continuous development of the battery and semiconductor industries, the demand for electronic-grade esters is constantly increasing, as are the purity requirements, typically requiring at least 99.99% purity. Further distillation and purification using industrial-grade esters (typically 99.99%) is currently the main method for producing electronic-grade esters. However, this distillation process requires a large number of theoretical plates and a high reflux ratio, resulting in high energy consumption and consequently high production costs, severely limiting the large-scale production and market promotion of electronic-grade ester products.

[0003] Direct heat pumps compress the overhead vapor from distillation columns, which can then be used as a heat source for the reboiler, saving steam consumption and equipment investment, and reducing costs. However, some esters, especially asymmetric esters, undergo decomposition reactions during compression, thus generating impurity alcohols that affect the purity of electronic-grade esters.

[0004] To address the aforementioned issues, a one-to-two indirect heat pump distillation system is proposed. In this system, water exchanges heat with the material at the top of the product column, absorbing heat and evaporating into steam. The steam is then compressed to increase its pressure and temperature, and used as the heat source for the light product removal column and the product column, respectively. This saves steam consumption and equipment investment, thereby reducing costs. Utility Model Content

[0005] The purpose of this utility model patent is to provide a two-stage indirect heat pump distillation system. It includes a light component removal column and a product column. Using crude ester as raw material, the material first enters the light component removal column. The light components enter the light component removal column reflux tank from the top of the column, passing through the condenser, where part is refluxed and part is collected. The material collected from the bottom of the light component removal column enters the product column. Water in the product column condenser exchanges heat with the material at the top of the column, absorbing heat and evaporating into water vapor. The water vapor is then compressed and its pressure and temperature increased, and sent to the bottoms of both the light component removal column and the product column to heat the liquid in the bottoms, while the vapor itself condenses into liquid. The liquid is then throttled and depressurized before returning to the product column condenser. Thus, heat from the low temperature at the top of the column is transferred to the high temperature at the bottom of the column via water.

[0006] Compared with the prior art, the beneficial effects of this utility model are as follows: the cooling medium is water, which has good chemical and thermal stability, has no negative effects on humans and the ozone layer when leaked, is inexpensive, and has excellent heat transfer characteristics. Furthermore, the investment in the one-to-two indirect heat pump distillation system is low, resulting in low cost. Attached Figure Description

[0007] Figure 1This is a schematic diagram of the structure of this utility model.

[0008] The reference numerals and names in the figure are as follows:

[0009] 1. Crude ester storage tank; 2. Feed pump for light ester removal tower; 3. Light ester removal tower; 4. Product tower; 5. Condenser for light ester removal tower; 6. Reflux tank for light ester removal tower; 7. Condenser for product tower; 8. Compressor; 9. Reboiler for light ester removal tower; 10. Reboiler for product tower; 11. Bottom-out pump for light ester removal tower; 12. Throttling and pressure-reducing valve for light ester removal tower; 13. Throttling and pressure-reducing valve for product tower; 14. Reflux tank for product tower; 15. Bottom-out pump for product tower. Detailed Implementation

[0010] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0011] As attached Figure 1 As shown, this utility model provides a one-to-two indirect heat pump distillation system. The system includes a light-weight removal tower 3 and a product tower 4, with a crude ester storage tank 1 connected to the light-weight removal tower 3. The system is characterized by: a light-weight removal tower condenser 5 connected to the top of the light-weight removal tower 3; the light-weight removal tower condenser 5 connected to a light-weight removal tower reflux tank 6; the bottom of the light-weight removal tower 3 connected to the product tower 4; the top of the product tower 4 connected to a product tower condenser 7; water is provided in the product tower condenser 7 as an intermediate heat exchange medium; a compressor 8 connected to the product tower condenser 7; the compressor 8 connected to a light-weight removal tower reboiler 9 and a product tower reboiler 10; the light-weight removal tower reboiler 9 connected to a light-weight removal tower throttling and pressure-reducing valve 12; the product tower reboiler 10 connected to a product tower throttling and pressure-reducing valve 13; the light-weight removal tower throttling and pressure-reducing valve 12 and the product tower throttling and pressure-reducing valve 13 connected to the product tower condenser 7; and the product tower condenser 7 connected to a product tower reflux tank 14. The bottom of the light-weight removal tower 3 is connected to the light-weight removal tower reboiler 9, and the bottom of the product tower 4 is connected to the product tower reboiler 10.

[0012] Specifically, a feed pump 2 for the light-light product removal tower is connected between the crude ester storage tank 1 and the light-light product removal tower 3, and a bottom pump 11 for the light-light product removal tower 3 is connected between the bottom of the light-light product removal tower 3 and the product tower 4. The bottom residue of the product tower 4 is collected by the bottom pump 14. This allows for accurate control of the amount of raw materials input, which is beneficial to the reaction and the generation of products.

[0013] Working Principle: This utility model provides a one-to-two indirect heat pump distillation system. The crude ester storage tank 1 is connected to the material inlet of the light component removal tower 3 via a feed pump 2. Light components flow from the top of the light component removal tower 3, through the condenser 5, and into the reflux tank 6, where a portion is returned to the top of the light component removal tower 3 and a portion is collected. The bottom material of the light component removal tower 3 is pumped into the material inlet of the product tower 4 via a bottom pump 11. The top material of the product tower 4 flows through the condenser 7 into the reflux tank 14, where a portion is returned to the top of the product tower 4 and a portion is collected. Water in the product tower condenser 7 exchanges heat with the material at the top of product tower 4, absorbing heat and evaporating into water vapor. The water vapor, after its pressure and temperature are increased by compressor 8, supplies heat to the reboiler 9 of the light-light product removal tower and the reboiler 10 of the product tower, respectively. It then condenses into liquid, which is then depressurized and cooled by the light-light product removal tower throttling valve 12 and the product tower throttling valve 13, respectively, before returning to the product tower condenser 7 to continue exchanging heat with the product tower material, forming an energy closed loop. The bottom of the light-light product removal tower 3 is connected to the reboiler 9, and the bottom of the product tower 4 is connected to the reboiler 10. The material in the bottom of the product tower 4 is collected by the product tower extraction pump 15. In this process, water is used as the cooling medium. Water has good chemical and thermal stability, has no negative effects on humans and the ozone layer when leaked, is inexpensive, and has excellent heat transfer characteristics. Furthermore, the investment in a two-way indirect heat pump distillation system is low, resulting in low costs.

[0014] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is merely for clarity. Those skilled in the art should consider the specification as a whole to form other embodiments that can be understood by those skilled in the art.

[0015] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front," "rear," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A two-stage indirect heat pump distillation system, comprising a light-light product removal column (3) and a product column (4), characterized in that: The crude ester storage tank (1) is connected to the light-removal tower (3). The top of the light-removal tower (3) is connected to the light-removal tower condenser (5). The light-removal tower condenser (5) is connected to the light-removal tower reflux tank (6). The bottom of the light-removal tower (3) is connected to the product tower (4). The top of the product tower (4) is connected to the product tower condenser (7). Water is provided in the product tower condenser (7) as an intermediate heat exchange medium. The product tower condenser (7) is connected to a compressor (8). The compressor (8) is connected to the light-removal tower reboiler (9) and... The product tower reboiler (10) is connected to the light tower reboiler (9), which is connected to the light tower throttling and pressure reducing valve (12). The product tower reboiler (10) is connected to the product tower throttling and pressure reducing valve (13). The light tower throttling and pressure reducing valve (12) and the product tower throttling and pressure reducing valve (13) are connected to the product tower condenser (7). The product tower condenser (7) is connected to the product tower reflux tank (14). The bottom of the light tower (3) is connected to the light tower reboiler (9), and the bottom of the product tower (4) is connected to the product tower reboiler (10).

2. The distillation system with one-way and two-way indirect heat pumps according to claim 1, characterized in that: A feed pump (2) for the light removal tower is connected between the crude ester storage tank (1) and the light removal tower (3).

3. The distillation system with one-way and two-way indirect heat pumps according to claim 1, characterized in that: The bottom of the light-light removal tower (3) is connected to the product tower (4) by a bottom-collecting pump (11).

4. The distillation system with one-way and two-way indirect heat pumps according to claim 1, characterized in that: The residue in the bottom of the product tower (4) is extracted by the product tower bottom extraction pump (15).

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