Bubble generating device in hot flow field of methanol carbonylation reaction system

Abstract

The utility model discloses a kind of bubble generating devices in methanol carbonylation reaction system hot flow field, including bubble tank, jacket, heating device and condensing device. In addition to the periphery of the new bubble tank setting jacket, heating device is also set in tank, can make the methanol carbonylation reaction system in bubble tank faster and more stable control in 10~55 ℃, the new model can finally detect the bubble motion trajectory under the highest temperature 55 ℃;In addition, bubble tank top cover is equipped with condensing device, the methanol in the methanol carbonylation synthesis acetic acid reaction system in bubble tank volatilizes methanol steam under the condition of 10~55 ℃, after condensing by condensing device, it is backflowed into bubble tank again, prevent the loss caused by methanol volatilization to ambient atmosphere, also reduce the explosion combustion risk caused by methanol steam concentration too high around device, improve the safety of operating environment.

Description

Technical Field

[0001] This utility model relates to the field of fluid mass transfer technology, specifically to a bubble generating device in a hot flow field of a methanol carbonylation reaction system. Background Technology

[0002] Acetic acid is an important chemical raw material and organic solvent, indispensable for industries such as fiber, light industry, chemicals, medicine, food, and petroleum production. With the rapid development of downstream industries such as vinyl acetate, the consumption of acetic acid has increased significantly, becoming an important component of the national economy. Acetic acid production processes include the acetylene-acetaldehyde method, the ethanol-acetaldehyde method, the ethylene-acetaldehyde method, the butane oxidation method, and the methanol low-pressure carbonylation synthesis method. Currently, the methanol low-pressure carbonylation synthesis method, the acetaldehyde oxidation method, the butane liquid-phase oxidation method, and the ethylene direct oxidation method account for 60%, 25%, and 15% of the world's total acetic acid production capacity, respectively. The methanol carbonylation synthesis of acetic acid not only uses inexpensive raw materials but also achieves a selectivity of over 99% with virtually no byproducts. Therefore, the methanol carbonylation method is currently the main industrial method for producing acetic acid, where methanol and carbon monoxide are synthesized in the liquid phase under the action of a catalyst.

[0003] The methanol carbonylation process for synthesizing acetic acid involves reacting a ternary system of high-purity methanol, carbon monoxide, and acetic acid with a catalyst in a reactor to directly synthesize acetic acid. The synthesized acetic acid is crude acetic acid with a concentration of approximately 80%, containing some water, propionic acid, methanol, and catalyst. The methanol carbonylation process is a gas-liquid heterogeneous reaction, with carbon monoxide existing as bubbles in the liquid phase. The bubble motion of carbon monoxide in the methanol carbonylation reaction system significantly affects the mass transfer process between the gas and liquid phases in this heterogeneous reaction. Carbon monoxide bubbles typically exist as a dispersed phase in the reactor; their motion not only determines the flow field structure but also alters the gas-liquid interface properties, ultimately significantly impacting the mass transfer characteristics of the entire system. Therefore, studying the experimental setup, system, and bubble motion parameters of the methanol carbonylation reactor can provide a scientific basis for exploring mass transfer performance in gas-liquid two-phase flows and optimizing reactor design.

[0004] In existing technologies, computer simulation software is typically used to calculate the bubble motion parameters of a methanol carbonylation reactor. However, computer simulations cannot account for the influence of various factors in real experiments, resulting in significant errors between the obtained parameters and those obtained through actual experiments. When using real experiments, the liquid phase of the methanol carbonylation reaction system for synthesizing acetic acid mainly consists of methanol, acetic acid, water, and propionic acid. Methanol has a boiling point of 64.75℃, and its saturated vapor pressure reaches 12.88–68.76 kPa at 20–55℃, meaning that a significant amount of methanol has already volatilized at these temperatures. Furthermore, methanol is flammable, with an explosive limit of 6%–36.5% in air. If methanol continues to volatilize at these temperatures, it not only leads to methanol loss but also poses a risk of explosion or combustion, resulting in low safety. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a bubble generating device in the hot flow field of a methanol carbonylation reaction system. This experimental device is simple to operate and can not only measure the bubble movement in the hot flow field of the methanol carbonylation reaction within the range of 10~55℃ and obtain its movement parameters, but also prevent losses caused by methanol volatilization and improve the safety of the operating environment.

[0006] A bubble generating device in a hot flow field of a methanol carbonylation reaction system includes a bubble tank, a jacket, a heating device, and a condensation device;

[0007] The top opening of the bubble tank is provided with an openable and closable top cover, and the bottom of the bubble tank is provided with an air inlet; the top cover is detachably installed on the bubble tank, and the top cover is provided with a condensation port and a hole;

[0008] The jacket has an outlet at its top and an inlet at its bottom, with the inlet and outlet facing each other. The inlet is connected to the heating device, i.e., the inlet is connected to the outlet of the heating device. The bubble tank is located inside the jacket.

[0009] The heating device is used to heat the reaction system in the bubble tank, and the heating device is disposed in the bubble tank.

[0010] The condensing device is installed on the top cover and is connected to the condensing port;

[0011] Preferably, it also includes a bubble component, which is connected to the bubble groove through an air inlet at the bottom of the bubble groove.

[0012] Preferably, the bubble component is a gas pipe equipped with a flow meter and a check valve.

[0013] Preferably, the heating device is a pipe with an inlet at one end and an outlet at the other end. The pipe has a section of spirally wound tube. The inlet of the heating device is connected to constant temperature water, and the outlet of the heating device is connected to the jacket inlet.

[0014] Preferably, the heating device is a planar spiral structure with at least one layer, or a spiral downward structure, so as not to obstruct the acquisition of bubble images.

[0015] Preferably, the bubble groove is a cylinder made of glass; the jacket is a cube made of acrylic sheet; and the heating device is a stainless steel pipe, titanium pipe, copper pipe, aluminum pipe, seamless steel pipe, or welded pipe.

[0016] Preferably, the outer edge of the top opening of the bubble groove is provided with a flange, and the top cover is detachably connected to the bubble groove by bolts.

[0017] Preferably, the condensation device is a condenser tube.

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

[0019] In addition to the outer jacket, this novel bubble tank is equipped with a heating device inside, which allows for faster and more stable control of the methanol carbonylation reaction system within the bubble tank at 10~55℃. This novel design can ultimately detect the movement trajectory of bubbles at a maximum temperature of 55℃. Furthermore, the top cover of the bubble tank is equipped with a condensation device. Methanol in the methanol carbonylation to acetic acid synthesis reaction system within the bubble tank evaporates into methanol vapor at 10~55℃. After being condensed by the condensation device, the vapor flows back into the bubble tank, preventing losses caused by methanol evaporation into the ambient atmosphere. This also reduces the risk of explosion and combustion caused by excessively high methanol vapor concentrations around the device, thus improving the safety of the operating environment. Attached Figure Description

[0020] Figure 1 This invention relates to a bubble generating device in a hot flow field device for a methanol carbonylation reaction system.

[0021] Figure 2 This invention relates to a bubble generating device in the hot flow field of a methanol carbonylation reaction system.

[0022] Figure 3 This is one structural form of the heating device in the present invention, which is a planar spiral structure with upper and lower layers;

[0023] Among them, 101-bubble tank, 102-jacket, 103-top cover, 104-heating device, 105-condensing device; 1011-top opening of bubble tank, 1012-flanged edge of bubble tank, 1013-bottom of bubble tank, 1014-bottom air inlet of bubble tank, 1021-outlet of jacket, 1022-inlet of jacket, 1031-bolt hole of top cover, 1032A-condensing port, 1032B-hole on top cover, 1041-inlet of heating device, 1042-outlet of heating device, 1051-inlet of condensing pipe, 1052-outlet of condensing pipe, 201-flow meter, 202-check valve. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0025] Example 1

[0026] Figures 1 to 3This diagram shows a schematic of a bubble generating device in a hot flow field of a methanol carbonylation reaction system according to a preferred embodiment of the present invention. The device includes a bubble tank 101, a jacket 102, a heating device 104, and a condensing device 105. A top cover 103 that can be opened and closed is provided at the top opening 1011 of the bubble tank. An air inlet 1014 is provided at the center of the bottom 1013 of the bubble tank 101, through which gas enters the bubble tank 101. The top cover 103 is detachably mounted on the bubble tank 101. A condensing port 1032A and a [missing information - likely a device name or function] are provided on the area of ​​the top cover 103 corresponding to the top opening 1011. Hole 1032B; the top side wall of the jacket 102 is provided with an outlet 1021, and the bottom side wall of the jacket 102 is provided with an inlet 1022. The inlet 1022 and the outlet 1021 are arranged opposite each other. This arrangement of the inlet and outlet facilitates the retention of constant temperature water. The inlet 1022 is connected to the heating device 104; the bubble tank 101 is vertically arranged in the center of the jacket 102. Gas can enter from the air inlet 1014 of the bubble tank 101, or an air inlet can be opened at the bottom of the jacket 102 at a position corresponding to the bottom air inlet 1014 of the bubble tank, and then the two air inlets are connected with a rubber stopper. When gas is introduced, it should be done without leakage. The bubble tank 101 and the jacket 102 can also be integrally formed with their bottom surfaces coplanar. When integrally formed, an air inlet is provided in the center of the bottom shared by the two. Heating device 104 is used to heat the reaction system inside bubble tank 101, and is disposed inside bubble tank 101. Condensing device 105 is installed on top cover 103, and passes through a rubber stopper into a pre-set hole 1032A in top cover 103. The rubber stopper seals and fixes the device 105 within hole 1032A. Condensing device 105 is connected to hole 1032A via the rubber stopper, and thus connected to bubble tank 101. Alternatively, an additional hole can be made in top cover 103 to house a thermometer for measuring the temperature of the reaction system.

[0027] refer to Figures 1 to 3 Preferably, it also includes a bubble component 2, which is inserted through a rubber plug into the air inlet 1014 at the bottom of the bubble tank 101. The rubber plug is sealed and fixed in the hole 1014. The bubble component 2 is connected to the hole 1014 through the rubber plug, and thus connected to the bubble tank 101.

[0028] refer to Figures 1 to 3 Preferably, the bubble component 2 is an air pipe equipped with a flow meter 201 and a check valve 202. The air pipe passes through a rubber plug into the air inlet 1014 at the bottom of the bubble tank 101. The rubber plug is sealed and fixed in the hole 1014. The bubble component 2 is connected to the hole 1014 through the rubber plug, and then connected to the bubble tank 101. The air pipe through the rubber plug section can be set to a smaller diameter air pipe, so that the bubbles are generated more uniformly. After the gas is introduced into the air pipe, the size and flow rate of the bubbles are controlled by the flow meter 201 and the check valve 202.

[0029] refer to Figures 1 to 3Preferably, the heating device 104 is a pipe with an inlet 1041 at one end and an outlet 1042 at the other end. The pipe has a spirally wound section to increase the contact area between the heating device 104 and the reaction system in the bubble tank 101. The inlet 1041 of the heating device 104 is connected to constant temperature water, and the outlet of the heating device 104 is connected to the jacket inlet 1022. The inlet 1041 and the outlet 1042 are inserted through a rubber plug into a pre-set hole 1032B in the top cover 103. The rubber plug is sealed and fixed in the hole 1032B. The inlet 1041 and the outlet 1042 are connected to the hole 1032B through the rubber plug, and then connected to the bubble tank 101.

[0030] refer to Figure 3 Preferably, the heating device 104 has a planar spiral structure with two layers in the bubble tank 101, which can uniformly heat the reaction system. The upper layer is in the upper half of the bubble tank 101, and the lower layer is in the lower half of the bubble tank 101. The heating device 104 can also be a spiral downward structure, so as not to obstruct the acquisition of bubble images.

[0031] refer to Figure 1-3 Preferably, the bubble groove 101 is a cylinder made of glass, and the jacket 102 is a cube made of acrylic sheet. The two different shapes of the bubble groove 101 and the jacket 102 can offset the effect of refraction when shooting bubbles, making the bubbles more realistic when shooting. The heating device 104 is a stainless steel pipe, titanium pipe, copper pipe, aluminum pipe, seamless steel pipe or welded pipe.

[0032] refer to Figures 1 to 3 Preferably, the top opening 1011 has a flange 1012 around its outer perimeter, and bolt holes are provided on the flange 1012. The top cover 103 also has bolt holes 1031 in the area corresponding to the flange 1012. The bolt holes of the two correspond to each other, which facilitates the installation of bolts when sealing the bubble groove 101. The top cover 103 is detachably connected to the bubble groove 101 by bolts, and a gasket is placed at the connection part.

[0033] refer to Figures 1 to 3 Preferably, the condensing device 105 is a condenser tube. The low-temperature solvent flows into the inlet 1051 of the condenser tube and flows out from the outlet 1052 of the condenser tube. The low-temperature solvent can be ethanol at 0°C to -40°C, which has a better condensing effect. The connection port near the lower end of the condenser tube is connected to the hole 1032A through a rubber plug, and then connected to the bubble tank 101.

[0034] A bubble generating device in a hot flow field for a methanol carbonylation reaction system is disclosed. The reaction system (methanol, acetic acid, propionic acid, and water) is added to a bubble tank 101, preferably submerging the uppermost spiral coil of the planar spiral structure or the downward spiral structure of the heating device 104. A gasket is then placed on 1012, and a top cover 103 is placed on the bubble tank 101. Bolts are installed through pre-drilled bolt holes 1031 on the top cover 103 and bolt holes on the flange 1012, and tightened. The inlet 1041 and outlet 1042 of the heating device 104 pass through hole 1032C, protruding above the top cover 103. A condenser pipe 1051 is installed, and its sealing is checked. Pre-set constant-temperature water (the water temperature can be 2-3℃ higher than the required test temperature of the reaction system) flows into the heating device 104 through inlet 1041, exits through outlet 1042, enters the jacket 102 through inlet 1022, and exits through outlet 1021. Ethanol in a low-temperature solvent at 0℃ to -40℃ flows in through condenser inlet 1051, exits through condenser outlet 1052, and flows back into the low-temperature solvent, forming a cycle. When the reaction system temperature reaches 55℃, nitrogen gas is introduced into the bubble tank 101 through a gas pipe. The flow meter 201 and check valve 202 control the bubble size and flow rate. Once the bubbles stabilize, a bubble image can be acquired. Subsequently, bubble motion parameters are obtained based on the acquired bubble image. During the acquisition process, the condenser 105 prevents losses caused by methanol evaporation. The evaporated methanol enters condenser 1051 and is condensed by 0℃ ethanol, flowing back into the bubble tank 101.

[0035] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A bubble generating device in a hot flow field of a methanol carbonylation reaction system, characterized in that: Includes bubble tank, jacket, heating device and condensation device; The top opening of the bubble tank is provided with an openable and closable top cover, and the bottom of the bubble tank is provided with an air inlet; the top cover is detachably installed on the bubble tank, and the top cover is provided with a condensation port and a hole; The jacket has a water outlet at its top and a water inlet at its bottom, with the water inlet and the water outlet facing each other; the water inlet of the jacket is connected to the heating device, and the bubble tank is located inside the jacket. The heating device is used to heat the reaction system in the bubble tank, and the heating device is disposed in the bubble tank. The condensing device is installed on the top cover and is connected to the condensing port.

2. The bubble generating device in the hot flow field of the methanol carbonylation reaction system according to claim 1, characterized in that: It also includes a bubble component, which is connected to the bubble tank through an air inlet at the bottom of the bubble tank.

3. The bubble generating device in the hot flow field of the methanol carbonylation reaction system according to claim 2, characterized in that: The bubble component is a gas pipe equipped with a flow meter and a check valve.

4. The bubble generating device in the hot flow field of the methanol carbonylation reaction system according to claim 2, characterized in that: The heating device is a pipe with an inlet at one end and an outlet at the other end. The pipe has a section of spirally wound tube. The inlet of the heating device is connected to constant temperature water, and the outlet of the heating device is connected to the jacket inlet.

5. The bubble generating device in the hot flow field of the methanol carbonylation reaction system according to claim 2, characterized in that: The heating device has a planar spiral structure or a downward spiral structure.

6. The bubble generating device in the hot flow field of the methanol carbonylation reaction system according to claim 1, characterized in that: The bubble chamber is a cylindrical glass structure; the jacket is a cubic acrylic sheet; and the heating device is made of stainless steel, titanium, copper, aluminum, seamless steel, or welded pipe.

7. The bubble generating device in the hot flow field of the methanol carbonylation reaction system according to claim 1, characterized in that: The top opening of the bubble tank has a flange around its outer edge, and the top cover is detachably connected to the bubble tank by bolts.

8. The bubble generating device in the hot flow field of the methanol carbonylation reaction system according to claim 1, characterized in that: The condensation device is a condenser tube.

Images