Isobutylene feed concentration automatic adjusting device for MTBE production line

Abstract

The utility model discloses a kind of isobutylene feed concentration automatic regulating device for MTBE production line, including carbon three raw material valve group, ether after carbon four back refining valve group, isobutylene online analyzer, raw material buffer tank, carbon three raw material pump, depropanizer, depropanizer bottom reboiler, depropanizer top cooler, depropanizer top buffer tank and depropanizer top reflux pump, the raw material buffer tank is connected with carbon three raw material valve group, ether after carbon four back refining valve group and carbon three raw material pump respectively, the carbon three raw material pump is connected with depropanizer, the bottom of the depropanizer is equipped with depropanizer bottom reboiler, the top of the depropanizer is equipped with depropanizer top cooler, the depropanizer top cooler is connected with depropanizer top buffer tank, and isobutylene online analyzer is equipped between the carbon three raw material valve group and ether after carbon four back refining valve group.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, specifically to an isobutylene feed regulating device suitable for MTBE production lines. Background Technology

[0002] MTBE, or methyl tert-butyl ether, is a colorless, transparent, high-octane liquid with an ether-like odor and a wide range of industrial applications. Its raw materials include isobutylene, which is primarily obtained from refinery gas and C4 fractions from cracking in industrial production.

[0003] Our company currently has a 70,000-ton / year MTBE unit and a 30,000-ton / year MTBE unit. The raw materials for production include C3 feedstock supplied by petrochemical plants and some purchased feedstocks. Among them, the isobutylene content of the feedstock supplied by petrochemical plants is between 18% and 22%, while the isobutylene content of the purchased feedstocks is above 50%. During the continuous production of MTBE, it is required that the isobutylene feed concentration be kept stable within a specific range. Therefore, it is necessary to carry out innovative design of the feed unit. Utility Model Content

[0004] The technical problem solved by this utility model is to overcome the defects of the prior art and provide an automatic adjustment device for isobutylene feed concentration in MTBE production lines.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An automatic isobutylene feed concentration regulating device for an MTBE production line includes a C3 feed valve group, a post-etherification C4 recycle valve group, an online isobutylene analyzer, a feed buffer tank, a C3 feed pump, a depropanizer, a depropanizer bottom reboiler, a depropanizer top cooler, a depropanizer top buffer tank, and a depropanizer top reflux pump. The feed buffer tank is connected to the C3 feed valve group, the post-etherification C4 recycle valve group, and the C3 feed pump, respectively. The C3 feed pump is connected to the depropanizer. The bottom of the depropanizer is equipped with a depropanizer bottom reboiler, and the top of the depropanizer is equipped with a depropanizer top cooler, which is connected to the depropanizer top buffer tank.

[0006] Preferably, an online isobutylene analyzer is provided between the C3 raw material valve group and the post-etherification C4 remelting valve group.

[0007] Preferably, the top buffer tank of the depropanizer is connected to the top reflux pump of the depropanizer.

[0008] Preferably, the raw material is fed through the C3 raw material valve group to the isobutylene online analyzer and mixed with the C4 remelting valve group after etherification. After mixing, the isobutylene content of the raw material is below 18% and then enters the raw material buffer tank.

[0009] Preferably, the C3 feed pump pressurizes the feed from the bottom of the feed buffer tank and sends it to layers 41-43 of the propane removal tower. The feed is then separated by heated distillation, taking advantage of the different boiling points of isobutene, isobutane, and other C4 components, thus removing some unwanted components.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. The present invention relates to an automatic isobutylene feed concentration adjustment device for MTBE production line, wherein the online isobutylene analyzer can display the isobutylene content in real time and adjust the amount of etherified C4 remelting in a timely manner. 2. The automatic isobutylene feed concentration adjustment device used in the MTBE production line of this utility model ensures that the isobutylene content in the raw material buffer tank is below 18%, which maximizes the output of the device and controls the complete reaction of isobutylene. 3. The automatic isobutylene feed concentration adjustment device for the MTBE production line of this utility model can effectively extend the life of the catalyst by reducing the content of isobutylene in the raw material participating in the reaction. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the automatic isobutylene feed concentration adjustment device for MTBE production line according to this utility model.

[0012] The following are the labels in the diagram: 1. C3 feedstock valve assembly; 2. Post-ether C4 remelting valve assembly; 3. Isobutylene online analyzer; 4. Feedstock buffer tank; 5. C3 feedstock pump; 6. Propane stripper; 7. Propane stripper bottom reboiler; 8. Propane stripper top cooler; 9. Propane stripper top buffer tank; 10. Propane stripper top reflux pump. Detailed Implementation

[0013] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. The described embodiments are merely some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0014] Figure 1This utility model provides an automatic isobutylene feed concentration adjustment device for an MTBE production line, including a C3 feed valve group 1, a post-etherification C4 recycle valve group 2, an online isobutylene analyzer 3, a feed buffer tank 4, a C3 feed pump 5, a propane dehydrogenator 6, a bottom reboiler 7, a top cooler 8, a top buffer tank 9, and a top reflux pump 10. The feed buffer tank 4 is connected to the C3 feed valve group 1 and the post-etherification C4 recycle valve group 2. The recycle valve group 2 is connected to the C3 feed pump 5, the C3 feed pump 5 is connected to the depropanizer 6, the bottom of the depropanizer 6 is equipped with a depropanizer bottom reboiler 7, the top of the depropanizer 6 is equipped with a depropanizer top cooler 8, the depropanizer top cooler 8 is connected to the depropanizer top buffer tank 9, the C3 feed valve group 1 is equipped with an isobutylene online analyzer 3 between the ether-fed C4 recycle valve group 2, and the depropanizer top buffer tank 9 is connected to the depropanizer top reflux pump 10. The raw materials from the tank farm are mixed with the C3 feed valve group 1 to the isobutylene online analyzer 3 and the C4 remelting valve group 2 after etherification. After mixing, the isobutylene content of the raw materials is below 18% and enters the feed buffer tank 4. The C3 feed pump 5 pressurizes the raw materials from the bottom of the feed buffer tank 4 and sends them to layers 41-43 of the depropanizer 6. Through heated distillation, isobutylene and isobutane and other C4 components are separated by their different boiling points, removing some useless components. The top propane is cooled by the depropanizer top cooler 8 and enters the depropanizer top buffer tank 9. The propane in the depropanizer top buffer tank 9 is pressurized by the depropanizer top reflux pump 10, and part of the propane enters the depropanizer 6 for reflux to improve the distillation effect, while the other part is sent to the tank farm as product.

[0015] When this device is in operation, the C3 raw material valve group 1, the C4 refining valve group 2 after etherification, and the isobutylene online analyzer 3 are opened. After automatic adjustment, the isobutylene raw material enters the raw material buffer tank 4.

[0016] This utility model features a reasonable structural design, simple operation, low construction cost, and quick benefits. By using it, the isobutylene content of the raw material entering the propane removal tower is guaranteed to be below 18%.

[0017] The above embodiments describe the basic principles and main features of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments, and various changes and modifications can be made to this utility model without departing from the basic technical solution; all such changes and modifications fall within the protection scope of this utility model.

Claims

1. An automatic isobutylene feed concentration regulating device for an MTBE production line, comprising a C3 feed valve group (1), a post-etherification C4 remelting valve group (2), an online isobutylene analyzer (3), a feed buffer tank (4), a C3 feed pump (5), a depropanizer (6), a depropanizer bottom reboiler (7), a depropanizer top cooler (8), a depropanizer top buffer tank (9), and a depropanizer top reflux pump (10), characterized in that: The raw material buffer tank (4) is connected to the C3 raw material valve group (1), the C4 remelting valve group (2) after etherification and the C3 raw material pump (5) respectively. The C3 raw material pump (5) is connected to the depropanizer (6). The bottom of the depropanizer (6) is equipped with a depropanizer bottom reboiler (7). The top of the depropanizer (6) is equipped with a depropanizer top cooler (8). The depropanizer top cooler (8) is connected to the depropanizer top buffer tank (9).

2. The automatic isobutylene feed concentration adjustment device for MTBE production line according to claim 1, characterized in that: An online isobutylene analyzer (3) is provided between the C3 raw material valve group (1) and the C4 remelting valve group (2) after etherification.

3. The automatic isobutylene feed concentration adjustment device for MTBE production line according to claim 1, characterized in that: The top buffer tank (9) of the depropanizer is connected to the top reflux pump (10) of the depropanizer.

Images