A rapid dewatering device for 2-methylfuran

Abstract

The utility model discloses a kind of 2-methylfuran's rapid dehydration device, it is related to furfural relevant technical field.The utility model includes bottom conveying shell, heat preservation component, osmotic vaporization membrane component and top conveying shell, heat preservation component includes outer fixed sleeve, heat preservation sleeve and inner fixed sleeve, the inner wall of outer fixed sleeve is fixed with heat preservation sleeve, the inner wall of heat preservation sleeve is fixed with inner fixed sleeve, the top of heat preservation component is fixed with top conveying shell, the bottom of heat preservation component is fixed with bottom conveying shell, the top of bottom conveying shell in inner fixed sleeve is fixed with osmotic vaporization membrane component, the inner wall of osmotic vaporization membrane component is fixed with several air-permeable disc at equal intervals.The utility model is through being arranged bottom conveying shell, heat preservation component, osmotic vaporization membrane component and top conveying shell, solve 2-methylfuran multi-step dehydration through multiple equipment dehydration, dehydration efficiency is lower, and the problem that the difference of pressure in dehydration process is smaller and causes that dehydration rate is not enough high.

Description

Technical Field

[0001] This invention belongs to the technical field of furfural, and in particular relates to a rapid dehydration device for 2-methylfuran. Background Technology

[0002] The gas-phase 2-methylfuran production process involves hydrogenating gaseous furfural with hydrogen in a fixed-bed reactor to produce a mixture of 2-methylfuran and water. Under selective hydrogenation conditions and in the presence of a hydrogenation catalyst, the liquid-phase furfural feedstock is heated and vaporized. The gaseous furfural is then contacted with hydrogen in a hydrogenation reactor for further hydrogenation, yielding a mixture of 2-methylfuran and water at a temperature of 180-200℃. Since the 2-methylfuran and water remain in the gas phase, they can be dehydrated using a gas-phase dehydration device. However, this process still has the following drawbacks in practical application:

[0003] When 2-methylfuran is dehydrated after production, it is directly dehydrated by passing steam through it. During the dehydration process, 2-methylfuran needs to be condensed and heated to 62 degrees Celsius for azeotropic purification. The process requires multiple devices for multi-step dehydration, resulting in poor dehydration efficiency.

[0004] Furthermore, during the dehydration process, steam needs to be transported to the dehydration equipment and dehydrated through a pervaporation membrane. During the dehydration process, the water vapor needs to be separated and then discharged. During the separation process, the pressure difference during dehydration is small due to natural transport, which will result in an insufficient dehydration rate and affect the purity of the 2-methylfuran obtained. Utility Model Content

[0005] The purpose of this invention is to provide a rapid dehydration device for 2-methylfuran. By setting up a bottom conveying shell, a heat preservation component, a pervaporation membrane component, and a top conveying shell, it solves the problems of low dehydration efficiency and insufficient dehydration rate caused by multiple devices in the multi-step dehydration of 2-methylfuran, and the small pressure difference during the dehydration process.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This invention relates to a rapid dehydration device for 2-methylfuran, comprising a bottom conveying shell, a heat insulation component, a pervaporation membrane component, and a top conveying shell. The heat insulation component includes an outer fixed sleeve, a heat insulation sleeve, and an inner fixed sleeve. The heat insulation sleeve is fixed to the inner wall of the outer fixed sleeve, and the inner fixed sleeve is fixed to the inner wall of the heat insulation sleeve. The top conveying shell is fixed to the top of the heat insulation component, and the bottom conveying shell is fixed to the bottom of the heat insulation component. The pervaporation membrane component is fixed to the top of the bottom conveying shell within the inner fixed sleeve. Several permeable discs are fixed at equal intervals on the inner wall of the pervaporation membrane component. During operation, the mixed vapor of 2-methylfuran and water vapor generated in the fixed-bed reactor is conveyed through the bottom conveying shell to the pervaporation membrane component in the heat insulation component. The water vapor is removed by the multi-layer pervaporation membrane included in the pervaporation membrane component, and the 2-methylfuran vapor with removed water is collected and concentrated in the pervaporation membrane component through the top conveying shell.

[0008] Furthermore, the top end of the bottom conveying shell and the bottom end of the top conveying shell are both provided with connecting holes at positions corresponding to the pervaporation membrane assembly. The inner diameter of the connecting holes is equal to the inner diameter of the pervaporation membrane assembly, and the bottom conveying shell is connected to the pervaporation membrane through the connecting holes.

[0009] Furthermore, a support frame is fixed around the periphery of the bottom conveying shell, and an air inlet pipe is fixedly connected to the center of the bottom end of the bottom conveying shell. The bottom conveying shell is supported on the ground by the support frame, and the 2-methylfuran and water vapor generated by the fluidized bed reactor are conveyed to the bottom conveying shell through the air inlet pipe.

[0010] Furthermore, the insulation component also includes an output pipe and a negative pressure pump. The output pipe is fixedly connected to the outer fixing sleeve, the insulation sleeve, and the inner fixing sleeve. The end of the output pipe away from the outer fixing sleeve is fixedly connected to the negative pressure pump. The input end of the negative pressure pump is fixedly connected to the output pipe. The insulation component delivers water vapor to the negative pressure pump through the output pipe, and the water vapor is extracted and discharged by the negative pressure pump.

[0011] Furthermore, the pervaporation membrane assembly includes multiple layers of mutually overlapping pervaporation membranes, and the permeable plate has vertically penetrating vents. The vents are eccentrically positioned, and the vents on adjacent vents are staggered. 2-methylfuran and water vapor pass through the vents in the permeable plate.

[0012] Furthermore, a connecting pipe is fixedly connected to the center of the top of the top of the top conveying shell, a pressure valve is fixedly connected to the top of the connecting pipe, and a discharge pipe is fixedly connected to the top of the pressure valve. The top conveying shell, through the pressure valve, ensures that the 2-methylfuran vapor output from the connecting pipe can only be output to the discharge pipe after the pressure is high enough to open the pressure valve.

[0013] This utility model has the following beneficial effects:

[0014] This invention solves the problem of low dehydration efficiency in multi-step dehydration of 2-methylfuran by using multiple devices through a bottom conveying shell, a heat insulation component, and a pervaporation membrane component. The 2-methylfuran mixture is conveyed through an inlet pipe to the bottom conveying shell, and then through a connecting hole at the top of the bottom conveying shell to the pervaporation membrane component in the inner fixed sleeve. After entering the pervaporation membrane component, adjacent venting plates form chambers within the pervaporation membrane component. Water and 2-methylfuran mixed vapor are mixed and conveyed upwards through vents on the venting plates to the chambers formed by two adjacent venting plates, one after another, until the dried 2-methylfuran mixed vapor is conveyed to the top conveying shell. During operation, multi-step continuous drying through the pervaporation membrane can be effectively achieved, increasing the drying effect and allowing for thorough dehydration of 2-methylfuran through a single device, resulting in higher dehydration efficiency.

[0015] This invention solves the problem of insufficient dehydration rate caused by small pressure difference during the 2-methylfuran dehydration process by setting up a heat insulation component, a pervaporation membrane component, and a top conveying shell. When water vapor and 2-methylfuran mixed vapor are transported through the inside of the pervaporation membrane component, a negative pressure pump is activated to transport the water vapor separated in the inner fixed sleeve connected to the output pipe to the negative pressure pump. The negative pressure pump outputs the water vapor to the equipment for recovering heat from the water vapor, so that the inner fixed sleeve is in a negative pressure state. When the inner fixed sleeve is in a negative pressure state, the permeation efficiency of water vapor in the pervaporation membrane component is accelerated. The top conveying shell transports the dried 2-methylfuran vapor that has entered it to the top conveying shell through a connecting pipe. The top conveying shell then transports the vapor to the pressure valve, ensuring the 2-methylfuran vapor transport pressure in the top conveying shell and the pervaporation membrane component. This ensures positive pressure inside the pervaporation membrane component and negative pressure in the inner fixed sleeve, resulting in a larger pressure difference and a higher dehydration rate during the 2-methylfuran dehydration process. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A three-dimensional view of the assembly structure of a rapid dehydration device for 2-methylfuran;

[0018] Figure 2 A three-dimensional view of the bottom conveyor shell structure;

[0019] Figure 3 This is a three-dimensional view of the insulation component after it has been partially cut open.

[0020] Figure 4This is a cross-sectional view of a pervaporation membrane module.

[0021] Figure 5 for Figure 4 Enlarged 3D view of the structure at point A in the image;

[0022] Figure 6 This is a three-dimensional view of the top conveyor shell section after it has been cut open.

[0023] Figure label:

[0024] 1. Bottom conveying shell; 101. Connecting hole; 102. Air inlet pipe; 103. Support frame; 2. Insulation component; 201. Outer fixing sleeve; 202. Insulation sleeve; 203. Inner fixing sleeve; 204. Output pipe; 205. Negative pressure pump; 3. Pervaporation membrane component; 301. Ventilation plate; 302. Ventilation hole; 4. Top conveying shell; 401. Connecting pipe; 402. Pressure valve; 403. Discharge pipe. Detailed Implementation

[0025] 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 skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation

[0026] Please see Figure 1-5This invention relates to a rapid dehydration device for 2-methylfuran, comprising a bottom conveying shell 1, a heat insulation component 2, a pervaporation membrane component 3, and a top conveying shell 4. The heat insulation component 2 includes an outer fixing sleeve 201, a heat insulation sleeve 202, and an inner fixing sleeve 203. The heat insulation sleeve 202 is fixed to the inner wall of the outer fixing sleeve 201, and the inner fixing sleeve 203 is fixed to the inner wall of the heat insulation sleeve 202. The heat insulation component 2 fixes the heat insulation sleeve 202 within the outer fixing sleeve 201 and fixes the inner fixing sleeve 203 within the heat insulation sleeve 202. During operation, the heat insulation sleeve 202 keeps the vapor passing through the inner fixing sleeve 203 warm. The top conveying shell 4 is fixed to the top of the heat insulation component 2. The over-top conveying shell 4 concentrates the dehydrated 2-methylfuran. The bottom end of the insulation component 2 is fixed with a bottom conveying shell 1. The mixture of 2-methylfuran and water vapor is dispersed and conveyed to the pervaporation membrane component 3 through the bottom conveying shell 1. The top end of the bottom conveying shell 1 inside the inner fixed sleeve 203 is fixed with the pervaporation membrane component 3. The mixed vapor is conveyed into the cavity inside the pervaporation membrane component 3. The water in the mixed vapor is permeated through the pervaporation membrane component 3, while the 2-methylfuran is retained. Several venting plates 301 are fixed at equal intervals on the inner wall of the pervaporation membrane component 3. The water vapor and 2-methylfuran mixed vapor are permeated through the venting plates 301, and a compartment is formed between adjacent venting plates 301.

[0027] Specifically, a connecting hole 101 is provided at the top of the bottom conveying shell 1 and the bottom of the top conveying shell 4, corresponding to the position of the pervaporation membrane assembly 3. The inner diameter of the connecting hole 101 is equal to the inner diameter of the pervaporation membrane assembly 3. The bottom conveying shell 1 and the top conveying shell 4 are connected to the pervaporation membrane assembly 3 through the connecting hole 101.

[0028] Furthermore, a support frame 103 is fixed around the bottom conveying shell 1, and an air inlet pipe 102 is fixedly connected to the center of the bottom end of the bottom conveying shell 1. The bottom conveying shell 1 is supported on the ground by the support frame 103, and the bottom end of the air inlet pipe 102 is connected to the output end of the fixed bed reactor. The mixed vapor of water and 2-methylfuran output from the fixed bed reactor is transported to the bottom conveying shell 1 through the air inlet pipe 102.

[0029] The operation process of this embodiment is as follows: During operation, the 2-methylfuran and water vapor mixture produced in the fixed bed reactor is transported to the bottom conveying shell 1 through the air inlet pipe 102, and then transported to the pervaporation membrane assembly 3 in the inner fixed sleeve 203 through the connecting hole 101 at the top of the bottom conveying shell 1. After entering the pervaporation membrane assembly 3, the mixture forms a chamber through the adjacent permeable plates 301 in the pervaporation membrane assembly 3, and the water and 2-methylfuran mixture is mixed and transported upward through the permeable holes 302 on the permeable plates 301 to the chambers formed by the two adjacent permeable plates 301, and so on, until the dried 2-methylfuran mixture is transported to the top conveying shell 4. During the operation, multi-step continuous drying through the pervaporation membrane can be carried out effectively, increasing the drying effect. Specific Implementation

[0030] Please see Figure 1 , 3 4, 5, 6. Based on the specific embodiment one, the heat preservation component 2 also includes an output pipe 204 and a negative pressure pump 205. The output pipe 204 is fixedly connected to the outer fixed sleeve 201, the heat preservation sleeve 202 and the inner fixed sleeve 203. The end of the output pipe 204 away from the outer fixed sleeve 201 is fixedly connected to the negative pressure pump 205. The input end of the negative pressure pump 205 is fixedly connected to the output pipe 204. The inner fixed sleeve 203 is connected to the input end of the negative pressure pump 205 through the output pipe 204. The output end of the negative pressure pump 205 is connected to the equipment for recovering steam heat. The water vapor in the inner fixed sleeve 203 is extracted by the negative pressure pump 205 and sent to the equipment for recovering steam heat.

[0031] Specifically, the pervaporation membrane assembly 3 includes multiple layers of mutually overlapping pervaporation membranes. The pervaporation membrane assembly 3 formed by the multiple layers of mutually overlapping pervaporation membranes has a tubular structure. A vent 302 is vertically opened in the vent plate 301. The vent 302 is eccentrically arranged, and the vent 302 on two adjacent vent plates 301 are staggered. The pervaporation membrane assembly 3 allows water vapor and 2-methylfuran mixed vapor in the chamber formed in the two adjacent vent plates 301 to pass through the vent 302 on the vent plate 301.

[0032] Furthermore, a connecting pipe 401 is fixedly connected to the center of the top of the top of the top conveying shell 4. A pressure valve 402 is fixedly connected to the top of the connecting pipe 401. A discharge pipe 403 is fixedly connected to the top of the pressure valve 402. The top of the discharge pipe 403 is connected to the input end of the 2-methylfuran collection and liquefaction equipment. The top conveying shell 4 conveys the 2-methylfuran vapor in it to the pressure valve 402 through the connecting pipe 401. After the pressure of the 2-methylfuran vapor reaches a certain level, the pressure valve 402 opens and discharges it through the discharge pipe 403 into the equipment for further drying of 2-methylfuran.

[0033] The operation process of this embodiment is as follows: During operation, when the mixed vapor of water vapor and 2-methylfuran is transported through the interior of the pervaporation membrane assembly 3, the water vapor separated in the inner fixed sleeve 203 connected to the output pipe 204 is transported to the negative pressure pump 205 by starting the negative pressure pump 205. The water vapor is then output to the device for recovering the heat of the water vapor through the negative pressure pump 205, so that the inner fixed sleeve 203 is in a negative pressure state. When the inner fixed sleeve 203 is in a negative pressure state, the permeation efficiency of water vapor in the pervaporation membrane assembly 3 is accelerated. The top conveying shell 4 is transported to the top conveying shell 4 through the connecting pipe 401. The top conveying shell 4 is then transported to the pressure valve 402 to ensure the 2-methylfuran vapor transport pressure in the top conveying shell 4 and the pervaporation membrane assembly 3, so that the pervaporation membrane assembly 3 is kept under positive pressure and the inner fixed sleeve 203 is kept under negative pressure.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A rapid dehydration device for 2-methylfuran, comprising a bottom conveying shell (1), a heat insulation component (2), a pervaporation membrane component (3), and a top conveying shell (4), characterized in that: The insulation component (2) includes an outer fixing sleeve (201), an insulation sleeve (202) and an inner fixing sleeve (203). The insulation sleeve (202) is fixed on the inner wall of the outer fixing sleeve (201), and the inner fixing sleeve (203) is fixed on the inner wall of the insulation sleeve (202). The top of the insulation component (2) is fixed with a top conveying shell (4), and the bottom of the insulation component (2) is fixed with a bottom conveying shell (1). The top of the bottom conveying shell (1) inside the inner fixing sleeve (203) is fixed with a pervaporation membrane component (3). Several permeable plates (301) are fixed at equal intervals on the inner wall of the pervaporation membrane component (3).

2. The rapid dehydration device for 2-methylfuran according to claim 1, characterized in that: The bottom of the bottom conveying shell (1) and the bottom of the top conveying shell (4) are provided with connecting holes (101) at positions corresponding to the pervaporation membrane assembly (3). The inner diameter of the connecting hole (101) is equal to the inner diameter of the pervaporation membrane assembly (3).

3. The rapid dehydration device for 2-methylfuran according to claim 2, characterized in that: The bottom conveying shell (1) is fixed with a support frame (103) on its periphery, and an air inlet pipe (102) is fixedly connected to the center of the bottom end of the bottom conveying shell (1).

4. The rapid dehydration device for 2-methylfuran according to claim 1, characterized in that: The insulation component (2) also includes an output pipe (204) and a negative pressure pump (205). The output pipe (204) is fixedly connected to the outer fixing sleeve (201), the insulation sleeve (202) and the inner fixing sleeve (203). The end of the output pipe (204) away from the outer fixing sleeve (201) is fixedly connected to the negative pressure pump (205). The input end of the negative pressure pump (205) is fixedly connected to the output pipe (204).

5. The rapid dehydration device for 2-methylfuran according to claim 1, characterized in that: The pervaporation membrane assembly (3) includes multiple layers of pervaporation membranes that are mutually covered. A permeable hole (302) is vertically opened in the permeable plate (301). The permeable hole (302) is eccentrically arranged, and the permeable holes (302) on two adjacent permeable plates (301) are staggered.

6. The rapid dehydration device for 2-methylfuran according to claim 1, characterized in that: The top of the top conveying shell (4) is fixedly connected to a connecting pipe (401), the top of the connecting pipe (401) is fixedly connected to a pressure valve (402), and the top of the pressure valve (402) is fixedly connected to a discharge pipe (403).

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