A methanol recovery device for producing methyl benzoate

Abstract

The utility model belongs to the technical field of methyl pentanoate production equipment, specifically a methanol recovery device for producing methyl pentanoate, comprising a collecting tank; an inflow pipe, the inflow pipe is installed at the top of the collecting tank, the inflow pipe is composed of a thin tube section, a conical tube section and a thick tube section from top to bottom, the conical tube section and the thick tube section are located inside the collecting tank; and an airbag assembly. The utility model can achieve that the liquid level inside the inflow pipe is higher than the liquid level of the collecting tank, so that the inside of the collecting tank is relatively sealed to prevent the volatilized methanol from overflowing, and the cross-sectional area inside the thin tube section is small, and the volatilization amount is limited, so that the methanol solution can be well collected.

Description

Technical Field

[0001] The utility model belongs to the technical field of methyl pentanoate production equipment, in particular to a methanol recovery device used for producing methyl pentanoate. Background Art

[0002] The current process for producing methyl pentanoate is: using isopentenol and trimethyl orthoacetate to react under pressure and with a catalyst (completed in a distillation tower) to produce methyl pentanoate, and at the same time recovering the by-product methanol through distillation.

[0003] The temperature of the methanol solution discharged from the distillation tower is about 50°C (the boiling point of methanol is about 64°C), which makes the methanol easily volatilize, thus causing waste. Summary of the invention

[0004] The utility model aims to provide a methanol recovery device for producing methyl benzoate to solve the problems pointed out in the above background technology.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a methanol recovery device for producing methyl benzoate, comprising: a collecting tank;

[0006] An inflow pipe, the inflow pipe is installed at the top of the collection tank, and the inflow pipe comprises a thin pipe section, a tapered pipe section and a thick pipe section from top to bottom, and the tapered pipe section and the thick pipe section are located inside the collection tank;

[0007] Airbag components.

[0008] Optionally, it also includes: a cooling component, which is used to cool the outer wall of the collection tank and then perform heat exchange with the methanol solution in the collection tank.

[0009] Optionally, the cooling assembly comprises:

[0010] An outer covering cylinder, the outer side of the collecting tank is provided with an annular outer recess, the outer covering cylinder is fixedly connected to the outer side of the collecting tank, and an annular container is formed between the outer covering cylinder and the annular outer recess, and the interior of the annular container is filled with a cooling medium;

[0011] The spiral cooling tube is located inside the annular container, and the liquid inlet and the liquid outlet of the spiral cooling tube both extend out of the outer cylinder.

[0012] Optionally, a connecting flange is fixedly connected to the top end of the thin tube segment.

[0013] Optionally, the airbag assembly includes an elastic airbag and an air tube;

[0014] The first end of the trachea is connected to the elastic airbag, and the second end of the trachea is connected to the collection tank.

[0015] Optionally, a water level gauge is provided inside the collection tank.

[0016] Optionally, an outflow pipe is fixedly connected to the bottom end of the collecting tank.

[0017] Optionally, a sealing disk is fixedly connected to the outer side of the thin tube segment, a mounting opening is provided at the top of the collecting tank, and the sealing disk is fixedly and sealed to the mounting opening of the collecting tank.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model arranges the inflow pipe to have a structure which includes a thin pipe section, a tapered pipe section and a thick pipe section in sequence from top to bottom. The tapered pipe section and the thick pipe section are located inside a collecting tank, and the top end of the thin pipe section is located outside the collecting tank. The air pressure of the upper air layer inside the collecting tank is maintained by an airbag component, so that the liquid level inside the inflow pipe is higher than the liquid level of the collecting tank, so that the inside of the collecting tank is relatively sealed to prevent the volatilized methanol from overflowing. The cross-sectional area inside the thin pipe section is small, and the volatilization amount is limited, so that the methanol solution can be well collected. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0022] Figure 2 This is a front view structural schematic diagram of the utility model;

[0023] Figure 3 It is a side view structural schematic diagram of the utility model;

[0024] Figure 4 It is a schematic diagram of the top view structure of the utility model;

[0025] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure at CC in the middle.

[0026] In the figure: 1. collecting tank; 2. inflow pipe; 201. thin pipe section; 202. conical pipe section; 203. thick pipe section; 204. connecting flange; 205. sealing disk; 3. outflow pipe; 4. airbag assembly; 401. elastic airbag; 402. air pipe; 5. cooling assembly; 501. outer cylinder; 502. spiral cooling pipe; 6. water level gauge. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] The methanol recovery device for producing methyl benzoate provided in the embodiment of the utility model is now described. Figure 1-Figure 5 A methanol recovery device for producing methyl benzoate includes: a collecting tank 1, an inflow pipe 2 and an air bag component 4.

[0032] The inflow pipe 2 is installed at the top of the collecting tank 1, and the top of the inflow pipe 2 is used as the methanol solution collecting port. The collecting tank 1 is used to collect the top product of the distillation tower, that is, the top of the inflow pipe 2 is connected to the top product discharge port of the distillation tower, and the methanol solution (containing a small amount of methyl orthoacetate) produced in the production process of methyl benzoate flows into the collecting tank 1.

[0033] The utility model configures the inflow pipe 2 to be composed of a thin tube section 201, a conical tube section 202 and a thick tube section 203 from top to bottom, the conical tube section 202 and the thick tube section 203 are located inside the collection tank 1, the top end of the thin tube section 201 is located outside the collection tank 1, and the air pressure of the upper air layer inside the collection tank 1 is maintained by the airbag assembly 4.

[0034] The airbag assembly 4 relies on its own elasticity to maintain a stable air pressure (greater than atmospheric pressure) inside the airbag assembly 4, so that the air pressure in the upper air layer inside the collection tank 1 is relatively large, and the liquid level inside the inflow tube 2 is significantly higher than the liquid level in the collection tank 1.

[0035] When in use, it is necessary to keep the liquid level of the methanol solution inside the collecting tank 1 higher than the first liquid level a (the first liquid level a is higher than the bottom end of the thick tube section 203), and the liquid level in the inflow tube 2 is higher than the second liquid level b (the second liquid level b is higher than the top end of the conical tube section 202), so that the liquid cross-section inside the inflow tube 2 is very small, and the volatilization amount will be greatly reduced. The lower layer inside the collecting tank 1 is the methanol solution, and the upper layer is the upper air layer. The upper air layer and the airbag assembly 4 form a sealing part to prevent the volatilized methanol from overflowing, and the airbag assembly 4 can maintain the air pressure of the upper air layer inside the collecting tank 1. The higher air pressure will inhibit the volatilization of methanol.

[0036] Compared with the prior art, the methanol recovery device for producing methyl benzoate provided by the utility model has a structure in which the inflow pipe 2 is sequentially provided with a thin pipe section 201, a conical pipe section 202 and a thick pipe section 203 from top to bottom, the conical pipe section 202 and the thick pipe section 203 are located inside a collecting tank 1, the top end of the thin pipe section 201 is located outside the collecting tank 1, and the air pressure of the upper air layer inside the collecting tank 1 is maintained by an airbag component 4, so that the liquid level inside the inflow pipe 2 can be higher than the liquid level of the collecting tank 1, so that the inside of the collecting tank 1 is relatively sealed to prevent the volatilized methanol from overflowing, and the cross-sectional area inside the thin pipe section 201 is small, and the volatilization amount is limited, so that the methanol solution can be well collected.

[0037] In another embodiment of the present invention, please refer to Figures 1 to 5 , and also includes: a cooling component 5, which is used to cool the outer wall of the collecting tank 1, thereby performing heat exchange with the methanol solution in the collecting tank 1, so that the methanol solution inside the collecting tank 1 is quickly cooled, thereby slowing down the volatilization rate of the methanol solution.

[0038] In another embodiment of the present invention, please refer to Figures 1 to 5 The cooling assembly 5 includes: an outer cylinder 501 and a spiral cooling tube 502.

[0039] An annular outer recess is provided on the outer side surface of the collecting tank 1, and the outer covering cylinder 501 is fixedly connected to the outer side of the collecting tank 1, and an annular container is formed between the outer covering cylinder 501 and the annular outer recess, and the interior of the annular container is filled with a cooling medium, and the cooling medium can fully contact with the outer wall of the collecting tank 1. The spiral cooling tube 502 is located inside the annular container, and the cooling medium can also fully contact with the spiral cooling tube 502, and the liquid inlet and liquid outlet of the spiral cooling tube 502 both extend out of the outer covering cylinder 501, which is used to connect the cold water supply and recovery pipelines, thereby forming a cooling circulation structure, which can realize the recycling of cooling water.

[0040] In another embodiment of the present invention, refer to Figure 5 The top of the thin tube section 201 is fixedly connected with a connecting flange 204 for fixing and installing with the liquid outlet flange at the top of the distillation tower.

[0041] In another embodiment of the present invention, please refer to Figure 5 The airbag assembly 4 includes an elastic airbag 401 and an air tube 402 .

[0042] The first end of the air tube 402 is connected to the elastic airbag 401 , and the second end of the air tube 402 is connected to the collection tank 1 .

[0043] The elastic airbag 401 can maintain the internal air pressure stable by relying on its own elastic force. During the internal drainage process of the collecting tank 1, the upper air layer space inside the collecting tank 1 increases, and the gas inside the elastic airbag 401 is transported to the inside of the collecting tank 1. As methanol solution is continuously added to the inside of the collecting tank 1, the upper air layer space inside the collecting tank 1 gradually decreases, and the gas inside the collecting tank 1 is continuously transported to the inside of the elastic airbag 401.

[0044] In another embodiment of the present invention, please refer to Figure 5 A water level gauge 6 is provided inside the collecting tank 1 for real-time monitoring of the internal water level of the collecting tank 1 to ensure that the liquid level of the methanol solution inside the collecting tank 1 is always higher than the first liquid level a.

[0045] In another embodiment of the present invention, refer to Figure 3 The bottom end of the collecting tank 1 is fixedly connected with an outflow pipe 3, and a valve body can be installed at the outflow pipe 3 to output the liquid inside the collecting tank 1.

[0046] In another embodiment of the present invention, please refer to Figure 5 A sealing disk 205 is fixedly connected to the outer side of the thin tube section 201, and a mounting opening is opened at the top of the collecting tank 1. The sealing disk 205 is sealed and fixedly installed with the mounting opening of the collecting tank 1.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A methanol recovery device for producing methyl benzoate, comprising: The collecting tank (1) is characterized by comprising: an inflow pipe (2), the inflow pipe (2) being installed at the top end of the collection tank (1), the inflow pipe (2) comprising, from top to bottom, a thin pipe section (201), a conical pipe section (202) and a thick pipe section (203), the conical pipe section (202) and the thick pipe section (203) being located inside the collection tank (1); An air bag assembly (4) is used to maintain the air pressure of the upper air layer inside the collection tank (1).

2. The methanol recovery device for producing methyl benzoate according to claim 1, characterized in that: Also includes: Cooling assembly (5).

3. The methanol recovery device for producing methyl benzoate according to claim 2, characterized in that: The cooling assembly (5) comprises: An outer covering cylinder (501), the outer side surface of the collection tank (1) is provided with an annular outer recess, the outer covering cylinder (501) is fixedly connected to the outer side of the collection tank (1), and an annular container is formed between the outer covering cylinder (501) and the annular outer recess, and the interior of the annular container is filled with a cooling medium; The spiral cooling tube (502) is located inside the annular container, and the liquid inlet and the liquid outlet of the spiral cooling tube (502) both extend out of the outer cylinder (501).

4. The methanol recovery device for producing methyl benzoate according to claim 1, characterized in that: The top end of the thin tube section (201) is fixedly connected with a connecting flange (204).

5. The methanol recovery device for producing methyl benzoate according to claim 1, characterized in that: The airbag assembly (4) comprises an elastic airbag (401) and an air tube (402); The first end of the air tube (402) is connected to the elastic air bag (401), and the second end of the air tube (402) is connected to the collection tank (1).

6. The methanol recovery device for producing methyl benzoate according to claim 1, characterized in that: A water level gauge (6) is arranged inside the collection tank (1).

7. The methanol recovery device for producing methyl benzoate according to claim 1, characterized in that: The bottom end of the collecting tank (1) is fixedly connected with an outflow pipe (3).

8. The methanol recovery device for producing methyl benzoate according to claim 1, characterized in that: A sealing disk (205) is fixedly connected to the outer side of the thin tube section (201), a mounting opening is provided at the top end of the collection tank (1), and the sealing disk (205) is fixedly mounted to the mounting opening of the collection tank (1) in a sealed manner.

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