Device for separating etherified C4 alkene
By improving the separation system and heat exchange technology, the problem of separating C4 alkanes and C4 olefins in C4 ethers was solved, achieving efficient and low-energy product separation and improving product purity and quality.
Patent Information
- Application Number
- CN202520007276.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-01-02
AI Technical Summary
Existing distillation column systems cannot effectively separate C4 alkane and C4 olefin products from C4 ethers, resulting in low product purity and quality.
An improved separation system, including a feed pump, distillation column, feed heat exchanger, and stabilized gasoline cooler, is adopted to achieve efficient separation of C4 alkane-olefin mixtures through heat exchange and reflux control. The heat exchange efficiency is optimized by utilizing the reboiler and heat-conducting plate structure of the distillation column, and the feed rate is controlled by valves to flexibly adjust production parameters.
It improves heat exchange efficiency, reduces energy consumption, achieves efficient separation of C4 alkanes and C4 olefins, and enhances product purity and quality.
Smart Images
Figure CN223914707U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of post-etherified C4 tetraalkylene processing technology, and in particular to an apparatus for separating post-etherified C4 tetraalkylene. Background Technology
[0002] Post-etherification C4 refers to the C4 hydrocarbons remaining after the isobutylene reaction, mainly butene-1, butane, cis- and trans-butene-2, etc., which are the same as raffinate C4 except for the absence of isobutylene. Isobutylene in C4 reacts with methanol in an etherification reaction to produce MTBE (methyl tert-butyl ether). MTBE is used to produce high-purity isobutylene or as an additive to increase the octane number in high-octane gasoline production. Excess methanol from the etherification reaction is recovered and reused. In the separation of post-etherification C4, the original distillation column (stabilization column) system was used to separate the reaction products of the C4 reforming unit, i.e., to separate the C4 and light hydrocarbon mixture. After separation by the distillation column, C4 alkane products are produced at the top of the column, and light hydrocarbon products are produced at the bottom. The existing distillation column cannot separate C4 alkane and C4 olefin products from the C4 alkane-olefin mixture. Utility Model Content
[0003] In view of the above-mentioned prior art, the present invention provides an apparatus for separating C4 alkane products and C4 olefin products after etherification. The improved separation system can separate C4 alkane products and C4 olefin products from C4 alkane mixtures.
[0004] To achieve the above objectives, the technical solution of this utility model embodiment is implemented as follows:
[0005] An apparatus for separating C5 ethers includes a feed pump, a distillation column, a feed heat exchanger, and a stabilized gasoline cooler. A second feed pipe is sequentially connected to the feed pump, the feed heat exchanger, and the distillation column. A first feed pipe is located at a valve and connected to the pipeline between the feed pump and the heat exchanger. The bottom of the distillation column is sequentially connected to the feed heat exchanger and the stabilized gasoline cooler. The material discharged from the bottom of the distillation column exchanges heat with the materials in the first and second feed pipes in the feed heat exchanger. The stabilized gasoline cooler is connected to a first discharge pipe, which is connected to an external C5 separation system via a bypass pipe. A second discharge pipe is connected to the top of the distillation column.
[0006] Furthermore, it also includes a distillation column reboiler, wherein the feed end of the distillation column reboiler is connected to the bottom of the distillation column, the discharge end at the bottom is connected to the feed heat exchanger, and the vapor outlet at the top is connected to the middle of the distillation column.
[0007] Furthermore, the first discharge pipe is connected in series with a water cooler, a reflux tank and a reflux pump along the discharge direction. A reflux pipe is provided between the reflux pump and the end of the first discharge pipe. The reflux pipe is equipped with a first shut-off valve, and the end of the first discharge pipe is equipped with a second shut-off valve.
[0008] Furthermore, the feed heat exchanger includes a refrigerant pipe, a heat transfer pipe, a heat-conducting plate, and a shell. The shell contains several layers of the heat-conducting plate, which is corrugated. One end of the heat-conducting plate is connected to the inner wall of the shell, and the other end has a channel with the inner wall of the shell. The heat-conducting plate divides the inner cavity of the shell into several S-shaped heat transfer channels connected in series. The refrigerant pipe is embedded in the heat-conducting plate, and the heat transfer pipe is connected to the S-shaped heat transfer channels.
[0009] Furthermore, the crests and troughs of the heat-conducting plate are alternately arranged along the direction of heat medium flow, the front and rear sides of the heat-conducting plate are connected to the inner wall of the outer shell, and a convection zone is formed at the crest position at the bottom of the heat-conducting plate.
[0010] Furthermore, a spring sheet is provided at the bottom of the heat-conducting plate, and the spring sheet is located below the wave crest.
[0011] Furthermore, the spring sheet is composed of several elastic parts, and the spring coefficients of the elastic parts are different.
[0012] The beneficial effects of this invention are as follows: By preheating the feed using the material discharged from the distillation column, energy is effectively utilized, heat exchange efficiency is improved, and energy consumption is reduced. The valve installed on the first feed pipe can precisely control the feed rate of the C4 alkane-olefin mixture, making the production process more flexible and allowing adjustments to production parameters according to actual needs. Separating the C4 alkane-olefin mixture and the light hydrocarbon + C4 alkane mixture using the distillation column can efficiently separate C4 alkanes and C4 olefins, improving the purity and quality of the product. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the apparatus for separating ether-derived carbotetraalkylene according to Embodiment 1 of this application;
[0014] Figure 2 This is a schematic diagram of the feed heat exchanger in Embodiment 2 of this application;
[0015] Explanation of icon numbers:
[0016] 1. Feed pump; 2. Distillation column; 3. Feed heat exchanger; 4. Stabilized gasoline cooler; 5. Second feed pipe; 6. First feed pipe; 7. Valve; 8. Distillation column reboiler; 9. Water cooler; 10. Reflux tank; 11. Reflux pump; 12. Reflux pipe; 13. First shut-off valve; 14. Second shut-off valve; 15. Refrigerant pipe; 16. Heat transfer pipe; 17. Heat transfer plate; 18. Outer shell; 19. Spring plate; 20. Elastic part; 21. First discharge pipe; 22. Bypass pipe; 23. Second discharge pipe. Detailed Implementation
[0017] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in this specification of this utility model is for the purpose of describing particular embodiments only and is not intended to limit the utility model. In the following description, the expression "some embodiments" refers to a subset of all possible embodiments; however, it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.
[0018] It should also be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0019] Example 1
[0020] Please refer to the attached document. Figure 1This application provides an apparatus for separating C4 alkylene from ethers, comprising a feed pump 1, a distillation column 2, a feed heat exchanger 3, and a stabilized gasoline cooler 4. A second feed pipe 5 is sequentially connected to the feed pump 1, the feed heat exchanger 3, and the distillation column 2. A first feed pipe 6 is located at a valve 7 and connected to the pipeline between the feed pump 1 and the heat exchanger. The bottom of the distillation column 2 is sequentially connected to the feed heat exchanger 3 and the stabilized gasoline cooler 4. The material discharged from the bottom of the distillation column 2 exchanges heat with the materials in the first feed pipe 6 and the second feed pipe 5 in the feed heat exchanger 3. The stabilized gasoline cooler 4 is connected to a first discharge pipe 21, which is connected to an external C5 separation system via a bypass pipe 22. A second discharge pipe 23 is connected to the top of the distillation column 2. The C4 alkane-alkene mixture enters through the first feed pipe 6, while the light hydrocarbon + C4 alkane mixture enters through the second feed pipe 5. Under the action of the feed pump 1, the light hydrocarbon + C4 alkane mixture enters the feed heat exchanger 3 for heating. The first feed pipe 6 is initially pressurized; under this pressure, the C4 alkane-alkene mixture also enters the heat exchanger for heating. A valve 7 is installed in the first feed pipe 6 to control the feed rate of the C4 alkane-alkene mixture. The heat in the feed heat exchanger 3 comes from the material discharged from the distillation column 2. After heat exchange, the temperature of the material discharged from the distillation column 2 decreases, while the temperature of the material in the feed pipe increases. After being heated, the C4 alkane-olefin mixture and the light hydrocarbon + C4 alkane mixture can enter the distillation column 2 for separation. After separation, the C4 alkane is discharged from the second discharge pipe 23 at the top of the distillation column 2. The C4 olefin at the bottom of the distillation column 2 is cooled by the feed heat exchanger 3 and the stable gasoline cooler 4 and then discharged and stored through the first discharge pipe 21. Some of the C4 olefin can enter the external C5 separation system through the bypass pipe 22.
[0021] Specifically, it also includes a reboiler for distillation column 2. The feed end of the reboiler is connected to the bottom of distillation column 2, the discharge end at the bottom is connected to the feed heat exchanger 3, and the vapor outlet at the top is connected to the middle of distillation column 2. Thus, the material discharged from the bottom of distillation column 2 enters the reboiler for heating, and the vapor formed by the heating returns to the distillation column 2 from the vapor outlet at the top for separation. The unevaporated material at the bottom is discharged from the discharge end at the bottom and then enters the heat exchanger to exchange heat with the feed.
[0022] Specifically, the first discharge pipe 21 is connected in series with a water cooler 9, a reflux tank 10, and a reflux pump 11 along the discharge direction. A reflux pipe 12 is provided between the reflux pump 11 and the end of the first discharge pipe 21. The reflux pipe 12 is equipped with a first shut-off valve 13, and the end of the first discharge pipe 21 is equipped with a second shut-off valve 14. The water cooler 9 cools the C4 alkane in the first discharge pipe 21. The cooled C4 alkane enters the reflux tank 10 and is then discharged by the reflux pump 11. When the purity of the C4 alkane discharged from the first discharge pipe 21 is insufficient, the first shut-off valve 13 is closed and the second shut-off valve 14 is opened, allowing the C4 alkane to return to the distillation column 2 under the action of the reflux pump 11. When the C4 alkane purity meets the requirements, the first shut-off valve 13 is opened and the second shut-off valve 14 is closed, allowing the C4 alkane to be discharged from the first discharge pipe 21. Alternatively, the first shut-off valve 13 and the second shut-off valve 14 can be opened at a certain angle as needed, so that a portion of the C4 alkanes form a reflux cycle. In the reciprocating cycle, the C4 alkanes entering the distillation column 2 will react again and finally be discharged from the first discharge pipe 21.
[0023] Example 2
[0024] Please refer to the attached document. Figure 2 The difference between this embodiment and Embodiment 1 is that the feed heat exchanger 3 includes a refrigerant pipe 15, a heat transfer pipe 16, a heat-conducting plate 17, and a shell 18. The shell 18 contains several layers of the heat-conducting plate 17, which is corrugated. One end of each heat-conducting plate 17 is connected to the inner wall of the shell 18, and the other end has a channel with the inner wall of the shell 18. The heat-conducting plate 17 divides the inner cavity of the shell 18 into several S-shaped heat transfer channels connected in series. The refrigerant pipe 15 is embedded in the heat-conducting plate 17, and the heat transfer pipe 16 communicates with the S-shaped heat transfer channels. C4 olefins from the reboiler or distillation column 2 enter the S-shaped heat transfer channels through the heat transfer pipe 16 and flow from top to bottom along the S-shaped heat transfer channels. C4 alkane-olefin mixtures and light hydrocarbon + C4 alkane mixtures enter through the refrigerant channels and flow from bottom to top along the refrigerant channels. After heat exchange between the refrigerant channel and the internal thermal channel, the temperature of the C4 alkane-olefin mixture and the light hydrocarbon + C4 alkane mixture is increased, while the temperature of the C4 olefin is decreased. Because the heat exchange plate is corrugated, its surface area is increased within a limited length, thereby improving heat exchange between the media and increasing heat exchange efficiency. During heat exchange, the two media flow in opposite directions, thus enabling effective heat exchange.
[0025] Specifically, the crests and troughs of the heat-conducting plate 17 are alternately arranged along the direction of heat medium flow. The front and rear sides of the heat-conducting plate 17 are connected to the inner wall of the outer shell 18, and a convection zone is formed at the crest position at the bottom of the heat-conducting plate 17. When C4 olefins pass through the heat medium channel, part of the airflow is intercepted in the convection zone. Other airflows continuously pass below the intercepted airflow. Due to the wall adhesion effect of gas flow, some of the other airflows flow into the convection zone and exchange heat with the gas in the convection zone to form thermal convection. During the flow of C4 olefins, the cross-sectional area of the direct flow of C4 olefins decreases, and the airflow in contact with the heat-conducting plate 17 changes continuously during the flow, thereby guiding heat to the heat-conducting plate 17 and improving the heat exchange efficiency.
[0026] Optionally, the bottom of the heat-conducting plate 17 is provided with a spring plate 19, which is located below the wave crest. When the airflow passes through the spring plate 19, the airflow causes the spring plate 19 to vibrate, thereby promoting heat exchange of the gas in the convection zone.
[0027] Optionally, the spring sheet 19 is composed of a plurality of elastic portions 20, which have different stiffness coefficients. When disturbed by gas, the spring sheet 19 can vibrate, promoting heat exchange in the airflow.
[0028] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. The protection scope of this utility model should be determined by the protection scope of the stated claims.
Claims
1. An apparatus for separating etherified carbotetraalkylene, characterized in that, The system includes a feed pump, a distillation column, a feed heat exchanger, and a stabilized gasoline cooler. A second feed pipe is sequentially connected to the feed pump, feed heat exchanger, and distillation column. A first feed pipe is located at a valve and connected to the pipeline between the feed pump and the heat exchanger. The bottom of the distillation column is sequentially connected to the feed heat exchanger and the stabilized gasoline cooler. The material discharged from the bottom of the distillation column exchanges heat with the materials in the first and second feed pipes in the feed heat exchanger. The stabilized gasoline cooler is connected to a first discharge pipe, which is connected to an external C5 separation system via a bypass pipe. A second discharge pipe is connected to the top of the distillation column.
2. The apparatus for separating etherified C3-tetraalkylene according to claim 1, characterized in that, It also includes a distillation column reboiler, the feed end of which is connected to the bottom of the distillation column, the discharge end at the bottom of which is connected to the feed heat exchanger, and the vapor outlet at the top of which is connected to the middle of the distillation column.
3. The apparatus for separating etherified carbotetraalkylene according to claim 1, characterized in that, The first discharge pipe is connected in series with a water cooler, a reflux tank and a reflux pump along the discharge direction. A reflux pipe is provided between the reflux pump and the end of the first discharge pipe. The reflux pipe is equipped with a first shut-off valve and the end of the first discharge pipe is equipped with a second shut-off valve.
4. The apparatus for separating etherified carbotetraalkylene according to claim 1, characterized in that, The feed heat exchanger includes a refrigerant pipe, a heat transfer pipe, a heat-conducting plate, and a shell. The shell contains several layers of the heat-conducting plate, which is corrugated. One end of the heat-conducting plate is connected to the inner wall of the shell, and the other end has a channel with the inner wall of the shell. The heat-conducting plate divides the inner cavity of the shell into several S-shaped heat transfer channels connected in series. The refrigerant pipe is embedded in the heat-conducting plate, and the heat transfer pipe is connected to the S-shaped heat transfer channels.
5. The apparatus for separating etherified carbotetraalkylene according to claim 4, characterized in that, The heat-conducting plate has alternating crests and troughs along the direction of heat medium flow. The front and rear sides of the heat-conducting plate are connected to the inner wall of the outer shell. A convection zone is formed at the crest position at the bottom of the heat-conducting plate.
6. The apparatus for separating etherified carbotetraalkylene according to claim 5, characterized in that, The bottom of the heat-conducting plate is provided with a spring plate, which is located below the wave crest.
7. The apparatus for separating etherified carbotetraalkylene according to claim 6, characterized in that, The spring sheet is composed of several elastic parts, and the spring coefficients of the elastic parts are different.