High-yield MTBE catalytic distillation unit

Abstract

This invention discloses a high-yield MTBE catalytic distillation apparatus, specifically relating to the field of catalytic equipment technology. It includes a base on which a collection assembly is mounted. The collection assembly includes a catalytic tank housed within the base, with an inner liner in the center of the catalytic tank. The inner liner is equipped with several separation filter covers, all used for filtration. This invention creates a separation chamber between the inner liner and the catalytic tank. Utilizing the stacked separation filter covers on the inner liner, and taking advantage of the higher boiling point of MTBE compared to the feedstock, the unreacted low-boiling-point feedstock rapidly rises to the separation chamber during distillation, while the MTBE product flows downwards after being filtered through the separation filter covers. This achieves efficient separation of the two, solving the problem of difficulty in separating MTBE from low-boiling-point feedstocks in existing technologies.

Description

Technical Field

[0001] This utility model relates to the field of catalytic equipment technology, and more specifically, to a high-yield MTBE catalytic distillation apparatus. Background Technology

[0002] MTBE is an abbreviation for methyl tert-butyl ether. With a melting point of -109℃ and a boiling point of 55.2℃, it is a colorless, transparent, high-octane liquid with an ether-like odor. It is an ideal blending component for producing unleaded, high-octane, oxygenated gasoline and is widely used as a gasoline additive worldwide. It not only effectively increases the octane rating of gasoline but also improves vehicle performance, reduces CO content in exhaust gases, and lowers gasoline production costs. Furthermore, MTBE is an important chemical raw material; for example, it can be used to produce high-purity isobutylene through cracking. MTBE is an organic ether with an oxygen content of 18.2%. With increasingly stringent environmental requirements, countries worldwide are imposing stricter limits on the sulfur content of automotive gasoline. During MTBE production, MTBE has higher solubility for sulfides than C4 hydrocarbons, and most sulfides have higher boiling points than C4 hydrocarbons. Therefore, most of the sulfides in the feed C4 hydrocarbons are enriched in the MTBE product, resulting in a high sulfur content. Therefore, reducing the sulfur content in automotive gasoline is a major challenge currently facing the market.

[0003] Among them, the patent with announcement number CN217068810U discloses a high-yield MTBE catalytic distillation device, including a column body. Placement slots are opened on the inner walls of the front and rear ends of the column body. A guide rod is installed in the placement slot at the front end, and a guide sleeve is fitted on the guide rod. A screw with a waterproof motor is movably installed in the placement slot at the rear end. A nut is threaded on the screw. A waterproof rotary motor is fixedly installed at the front end of the nut. A frame is fixedly installed at the front end of the output shaft of the waterproof rotary motor. The front middle of the frame is movably connected to the rear end of the guide sleeve through a connecting rod. The inner walls of the front and rear ends of the frame are fixedly connected through a partition. The main catalytic bed is installed on one side of the partition, and the auxiliary catalytic bed is installed on the other side of the partition.

[0004] When in use, the waterproof multi-stage telescopic rod retracts, pulling the baffle plate towards the main catalytic bed and exposing the auxiliary catalytic bed. The auxiliary catalytic bed catalyzes the remaining raw materials, avoiding incomplete reaction of the raw materials due to insufficient catalyst and preventing the generation of waste. However, the boiling point of MTBE is higher than that of raw materials such as isobutylene and methanol, making it difficult to separate low-boiling-point unreacted raw materials during the distillation process, which is not convenient to use. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a high-yield MTBE catalytic distillation apparatus, which aims to solve the problems mentioned in the background art.

[0006] This utility model provides the following technical solution: a high-yield MTBE catalytic distillation apparatus, including a base, on which a collection component is provided;

[0007] The collection assembly includes a catalytic barrel disposed within a base, the catalytic barrel having an inner liner in the middle, and the inner liner having a plurality of separation filter covers, each used for filtration.

[0008] A collection hopper is provided in the middle of the inner liner, and a distillation tube is provided on the collection hopper. An extension tube is provided at one end of the distillation tube.

[0009] Optionally, in a possible implementation, a storage box is provided at the bottom end of the extension tube, the storage box is installed on the base by bolts, multiple separation filter covers are stacked, and a separation chamber is formed between the inner liner and the catalytic barrel, an electric heating plate is provided at the bottom end of the catalytic barrel and the inner liner, a support leg is provided at the bottom of the electric heating plate, the support leg is installed on the base by bolts, a cover plate is provided at the top end of the catalytic barrel and the inner liner, a through hole is opened in the middle of the cover plate, the extension tube passes through the through hole, and a feed valve for feeding is provided on the cover plate;

[0010] The technical effects and advantages of this utility model are as follows:

[0011] By forming a separation chamber between the inner liner and the catalytic tank, and with several stacked separation filter covers set on the inner liner, the low-boiling-point unreacted raw material can be rapidly raised to the separation chamber under distillation by taking advantage of the fact that the boiling point of MTBE is higher than that of the raw material. Meanwhile, the MTBE product flows downward after being filtered through the separation filter covers, achieving efficient separation of the two and solving the problem of the difficulty in separating MTBE and low-boiling-point raw materials in the existing technology.

[0012] The stacked separation filter covers increase the contact area and number of contacts between the raw materials and the catalyst, allowing unreacted raw materials to continue reacting as they flow through the multi-layer filter covers. At the same time, the separation chamber promptly separates unreacted raw materials and reduces their residence time in the catalytic zone, thereby reducing the probability of side reactions, significantly improving isobutylene conversion and MTBE selectivity, and achieving high product yield and high purity.

[0013] Furthermore, the integrated collection components can directly transport the separated MTBE products to the storage tank through pipelines, eliminating the need for complex external pipelines and transfer links in traditional devices; the electric heating plate can stably control the reaction temperature, eliminating the need for additional temperature control equipment, making the overall operation process simpler and more convenient to use. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0015] Figure 1 This is a front view of the overall structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the collection component of this utility model.

[0017] Figure 3 This is a schematic diagram of the base, catalytic tank, inner liner, separation filter cover, electric heating plate and support legs of this utility model.

[0018] Figure 4 This is a schematic diagram of the collection hopper, distillation tube, extension tube, and storage box of this utility model.

[0019] The attached diagram is labeled as follows: 1. Base; 2. Catalytic tank; 3. Inner liner; 4. Separation filter cover; 5. Collection hopper; 6. Distillation tube; 7. Extension tube; 8. Storage box; 9. Electric heating plate; 10. Support leg; 11. Cover plate; 12. Feed valve. Detailed Implementation

[0020] 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. Example

[0021] The high-yield MTBE catalytic distillation apparatus disclosed in this embodiment aims to solve the problems of inconvenient separation of MTBE from low-boiling-point feedstock and low reaction efficiency in existing apparatuses by optimizing structural design, thereby achieving high feedstock conversion and high product yield.

[0022] The high-yield MTBE catalytic distillation unit includes a base 1, a collection assembly, and supporting electrical control components, with the specific structure as follows:

[0023] As attached Figure 1 As shown, the base 1 is a rectangular steel structure frame used to support the weight of the entire device.

[0024] As attached Figure 3As shown, a catalyst tank 2 is placed on top of the base 1. An inner liner 3 is coaxially arranged inside the catalyst tank 2, forming an annular separation chamber between the inner liner 3 and the catalyst tank 2, as shown in the attached diagram. Figure 2 As shown, it is used for the upward separation of low-boiling-point unreacted raw materials.

[0025] As attached Figure 3 As shown, a DRT-200 type electric heating plate 9 is fixedly installed between the bottom end of the catalyst tank 2 and the bottom end of the inner liner 3. Its operating function is to monitor the temperature in real time through the built-in thermocouple and stabilize the temperature at 60-80℃ through the PLC controller, matching the activity range of the macroporous sulfonic acid resin catalyst. The bottom of the electric heating plate 9 is fixedly connected to the support leg 10 by bolts, and its bottom end is welded to the base 1 to ensure that the catalyst tank 2 and the inner liner 3 are placed stably and to avoid vibration affecting the reaction.

[0026] As attached Figure 2 As shown, several separation filter hoods 4 are installed from top to bottom on the inner wall of the inner liner 3. The separation filter hoods 4 are filled with macroporous sulfonic acid resin catalyst, such as Amberlyst 35. Their function is to support the catalyst to realize the addition reaction of isobutylene and methanol, while allowing the MTBE liquid generated by the reaction to flow downward through the filter holes, and the unreacted low-boiling point raw materials, isobutylene and methanol, to flow upward in gaseous state, so as to realize the simultaneous occurrence of reaction and preliminary separation.

[0027] As attached Figure 4 As shown, a collection hopper 5 is provided in the middle of the inner liner 3 to collect MTBE liquid passing through the separation filter hood 4; a distillation tube 6 is connected to the top of the collection hopper 5 by a thread, and the outer wall of the distillation tube 6 can be wrapped with heat insulation cotton to reduce heat loss of MTBE during transportation; the other end of the distillation tube 6 is connected to an extension tube 7 by a flange to transport MTBE to the storage tank 8.

[0028] As attached Figure 4 As shown, the bottom end of the extension tube 7 is inserted into the top feed port of the storage box 8, and the storage box 8 is fixedly installed on the top of the base 1 by bolts.

[0029] As attached Figure 1 As shown, the top of the catalytic tank 2 and the inner liner 3 are connected to a cover plate 11 by a flange to seal the catalytic tank 2 and the inner liner 3 and reduce the volatilization of raw materials; a through hole is opened in the middle of the cover plate 11, and the extension pipe 7 passes through the through hole and is sealed with the inner wall of the through hole by a rubber sealing gasket to ensure airtightness; a DN25 type feed valve 12 is installed on one side of the cover plate 11 for adding raw materials into the inner liner 3;

[0030] The specific working principle is as follows: isobutylene and methanol are mixed at a molar ratio of 1:1.1, and after pretreatment, impurities such as water and alkaline substances are removed and temporarily stored in the raw material tank.

[0031] Turn on the power of the electric heating plate 9 (model DRT-200), set the heating temperature to 70℃ using its built-in thermostat, and the electric heating plate 9 will start working. It will transfer heat to the inside of the catalytic tank 2 and the inner liner 3 through heat conduction, so that the temperature inside the inner liner 3 gradually rises to 70℃ and stabilizes.

[0032] Open the DN25 feed valve 12 on the cover plate 11. The raw material is continuously fed into the inner liner cylinder 3 through the feed valve 12. The raw material first comes into contact with the catalyst in the uppermost separation filter 4 and undergoes an addition reaction at 70°C to generate MTBE.

[0033] The generated MTBE, with a boiling point of 55.2℃, is higher than the boiling point of the raw material isobutylene (-6.9℃) and the boiling point of methanol (64.7℃). Under the action of gravity and distillation, it flows downward and passes through the separation filter 4 below in sequence, further contacting and reacting with the catalyst to improve the conversion rate.

[0034] Unreacted low-boiling-point isobutylene and a small amount of incompletely reacted methanol flow upwards in gaseous form, entering the separation chamber between the inner liner 3 and the catalytic tank 2, as shown in the attached diagram. Figure 2 As shown, since the temperature of the inner wall of the catalytic tank 2 is slightly lower than that of the inner liner 3, the gaseous raw material is partially condensed into liquid in the separation chamber and flows downward along the inner wall of the catalytic tank 2. It can be recycled and reused through the subsequent recovery port.

[0035] After multiple reactions, the MTBE liquid is collected in the collection hopper 5 and then transported to the storage tank 8 for temporary storage through the distillation tube 6 and the extension tube 7.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high-yield MTBE catalytic distillation apparatus, comprising a base (1), characterized in that: A collection component is provided on the base (1); The collection assembly includes a catalytic barrel (2) disposed in a base (1), and an inner liner (3) is provided in the middle of the catalytic barrel (2). The inner liner (3) is provided with a plurality of separation filter covers (4) for filtration. A collection hopper (5) is provided in the middle of the inner liner (3), a distillation tube (6) is provided on the collection hopper (5), and an extension tube (7) is provided at one end of the distillation tube (6).

2. The high-yield MTBE catalytic distillation apparatus according to claim 1, characterized in that: The bottom end of the extension tube (7) is provided with a storage box (8), which is installed on the base (1) by bolts.

3. The high-yield MTBE catalytic distillation apparatus according to claim 1, characterized in that: Multiple separation filter covers (4) are stacked, and a separation chamber is formed between the inner liner (3) and the catalyst tank (2).

4. The high-yield MTBE catalytic distillation apparatus according to claim 1, characterized in that: Both the bottom of the catalyst tank (2) and the inner liner (3) are provided with electric heating plates (9), and the bottom of the electric heating plates (9) is provided with support legs (10), which are installed on the base (1) by bolts.

5. The high-yield MTBE catalytic distillation apparatus according to claim 1, characterized in that: The top of both the catalyst tank (2) and the inner liner (3) are provided with a cover plate (11), and a through hole is provided in the middle of the cover plate (11).

6. The high-yield MTBE catalytic distillation apparatus according to claim 1, characterized in that: The extension tube (7) passes through the through hole, and the cover plate (11) is provided with a feed valve (12) for feeding.

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