Refining and purifying system for methanol production

Abstract

The invention discloses a refining and purifying system for methanol production, which comprises a reactive distillation tower, a pressurized distillation tower, a normal pressure distillation tower, a methanol distillation unit and a methanol filling unit, and the normal pressure distillation tower is matched with a reboiler, a tower top condenser and a tower top buffer tank; the methanol rectification unit comprises a rectification kettle and a condensation box; the methanol filling unit comprises a supporting table, a storage tank conveying belt is arranged above the supporting table, and a methanol packaging tank is placed on the storage tank conveying belt. A heating jacket is arranged outside the rectifying still, and a methanol discharge port is formed in the bottom end of the rectifying still. The heating jacket is arranged outside the rectifying still and is matched with the internal stirrer, so that materials can be uniformly heated, the rectifying process is accelerated, and the purification efficiency of methanol is remarkably improved. Meanwhile, the design of the material coil pipe and the condensate coil pipe in the condensing box is matched with an induced draft fan, so that light component gas can be efficiently cooled, light components and heavy components can be accurately separated, and the purity of methanol is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of methanol production, and in particular to a refining and purification system for methanol production. Background Art

[0002] Methanol, also known as hydroxymethane, wood alcohol, or wood spirits, is an organic compound and the simplest saturated monohydric alcohol with the chemical formula CH3OH / CH4O. It has a molecular weight of 32.04 and a boiling point of 64.7°C. Methanol is known as "wood alcohol" and "wood spirit" because it was once primarily produced by extraction from wood vinegar (a product of wood dry distillation or cracking). Modern methanol is produced directly from carbon monoxide, carbon dioxide, and hydrogen in a catalytic industrial process. Methanol is light, highly volatile, colorless, flammable, and has an odor very similar to ethanol (drinking alcohol). However, unlike ethanol, methanol is highly toxic and cannot be consumed. It is commonly used as a solvent, antifreeze, fuel, or ethanol denaturant. It can also be used in the production of biodiesel through transesterification.

[0003] In the field of methanol production, traditional refining and purification systems often have many shortcomings. On the one hand, the existing distillation equipment has a low separation efficiency for light components, resulting in insufficient methanol purification accuracy, making it difficult to meet the production needs of high-purity methanol. On the other hand, the degree of automation in the methanol filling process is limited, the positioning of the packaging tank is not precise enough, which is prone to filling errors, and the sealing of the liquid injection mechanism is poor, which may cause methanol leakage, affecting both production efficiency and posing a safety hazard. In addition, the traditional system has poor coordination between the various units and high energy consumption, making it difficult to achieve efficient and continuous production, which limits the scale and high-quality development of methanol production. Summary of the Invention

[0004] In order to solve the problems mentioned in the above background technology, the present invention provides a refining and purification system for methanol production.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A refining and purification system for methanol production, comprising a reactive distillation tower, a pressure distillation tower, an atmospheric distillation tower, a methanol distillation unit, and a methanol filling unit. The atmospheric distillation tower is equipped with a reboiler, a tower top condenser, and a tower top buffer tank. The methanol distillation unit includes a distillation kettle and a condenser; The methanol filling unit comprises a support platform, a storage tank conveyor belt is provided above the support platform, and a methanol packaging tank is placed on the storage tank conveyor belt.

[0006] Preferably, a heating jacket is provided on the outside of the distillation kettle, a methanol discharge port is provided at the bottom of the distillation kettle, a top cover is hinged on the top of the distillation kettle, an opening and closing cylinder is hinged on one side of the distillation kettle, and the output end of the opening and closing cylinder is hinged to the top cover.

[0007] Preferably, an agitator is provided in the distillation kettle, the power input shaft of the agitator extends to the top of the top cover, a rotating motor is fixed to the top of the top cover, and pulleys are provided at the top of the output shaft of the rotating motor and the power input shaft, and the two pulleys are driven by a belt.

[0008] Preferably, an exhaust fan is provided at the top of the condensation box, a material coil is provided inside the exhaust fan, and the material coil is connected to the exhaust port at the top of the top cover through a connecting pipe.

[0009] Preferably, an exhaust buffer tank is installed on the connecting pipe, and the bottom end of the material coil is connected to a light component storage.

[0010] Preferably, a condensate coil is installed inside the condensation box, and an air inlet is provided at the bottom end of the condensation box.

[0011] Preferably, two mutually parallel limit baffles are installed directly above the storage tank conveyor belt, the spacing between the two limit baffles is adjustable, and the methanol packaging tank is placed between the two limit baffles.

[0012] Preferably, a first support column is fixed to the top of the support platform, a fixing frame is installed on the top of the first support column, a lifting cylinder is fixed to the top of the fixing frame, a lifting bracket is fixed to the output shaft of the lifting cylinder, and a plurality of liquid injectors are fixed to the bottom of the lifting bracket.

[0013] Preferably, a first rack is fixed to the bottom end of the lifting bracket, a vertical slide rail is fixed to the top end of the support platform through a second support, a limit lifting frame is slidably installed on the vertical slide rail, a limit baffle and a second rack are respectively fixed on the limit lifting frame, a first gear and a second gear are coaxially installed on one side of the vertical slide rail, the first gear is engaged with the second rack, the second gear is engaged with the first rack, and the diameter of the first gear is larger than the diameter of the second gear.

[0014] Preferably, the injector includes a fixed part, a lifting sliding sleeve is provided on the bottom end of the fixed part, and a reset spring is provided between the fixed part and the lifting sleeve, an injection tube is fixed at the bottom end of the fixed part, the bottom end of the injection tube extends to the bottom of the lifting sleeve and is provided with an injection needle, a methanol inlet is fixed on the lifting sleeve, and an injection opening corresponding to the methanol inlet is opened on the side wall of the injection tube.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By installing a heating jacket on the outside of the distillation kettle and combining it with an internal agitator, this invention can evenly heat the material and accelerate the distillation process, significantly improving the efficiency of methanol purification. Furthermore, the design of the material coil and condensate coil within the condenser, combined with the exhaust fan, can efficiently cool the light component gas, achieving precise separation of light and heavy components, significantly improving methanol purity. 2. In the methanol filling unit, adjustable limit baffles precisely grip the methanol cans, ensuring the injector is accurately aligned with the can opening during filling. The synergistic effect of the lifting cylinder and the rack and pinion transmission mechanism synchronizes the lowering of the injector with the rising limit baffle, ensuring an orderly filling process and improving production automation. 3. The injector adopts a structure in which a reset spring and an injection opening are matched. When not filling, the injection opening and the methanol inlet are highly staggered to achieve automatic sealing, effectively preventing methanol leakage and improving production safety. 4. The integrated design of the reaction distillation tower, pressure distillation tower, atmospheric distillation tower, methanol distillation unit, and filling unit realizes continuous operation from methanol production to purification and then to filling. The units work together to reduce energy consumption while improving production efficiency, and have high social use value and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0017] Figure 1 is a flow chart of the present invention; Figure 2 This is a front view of the methanol distillation unit of the present invention; Figure 3 This is a rear view of the methanol distillation unit of the present invention; Figure 4 It is a three-dimensional diagram of the methanol distillation unit of the present invention; Figure 5 This is a first-perspective stereoscopic view of the methanol filling unit of the present invention; Figure 6 This is a front view of the methanol filling unit of the present invention; Figure 7 This is a perspective view of the methanol filling unit of the present invention from a second perspective; Figure 8 for Figure 7 A magnified detail of position A in the middle; Figure 9 This is a sectional view from the main perspective of the liquid injector of the present invention; Figure 10 This is a front view of the liquid injector of the present invention; In the figure: 1. atmospheric distillation tower; 101. tower top condenser; 102. tower top buffer tank; 103. reboiler; 2. methanol distillation unit; 201. distillation kettle; 202. condenser box; 203. methanol discharge port; 2031. hand wheel; 204. top cover; 2041. opening and closing cylinder; 205. connecting pipe; 2051. exhaust buffer tank; 206. material coil; 207. condensate coil; 208. light component storage; 209. rotating motor; 2091. power input shaft; 2092. belt; 3. methanol filling unit; 301. support platform; 302. storage tank conveyor belt; 3021. limit Position baffle; 3022, methanol packaging tank; 303, first support column; 304, fixed frame; 305, lifting cylinder; 306, lifting bracket; 307, injector; 3071, fixing part; 3072, lifting sleeve; 3073, injection tube; 3074, injection needle; 3075, injection opening; 3076, methanol inlet; 3077, return spring; 308, second support column; 3081, vertical slide rail; 3082, position limiting lifting frame; 3083, position limiting baffle; 3084, second rack; 3085, first gear; 3086, second gear; 3087, first rack. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0019] Example 1

[0020] Reference Figure 1-10 A refining and purification system for methanol production includes a reactive distillation tower, a pressure distillation tower, and an atmospheric distillation tower 1, a methanol distillation unit 2, and a methanol filling unit 3. The atmospheric distillation tower 1 is equipped with a reboiler 103, a tower top condenser 101, and a tower top buffer tank 102. Dimethyl carbonate and ethanol, with a catalyst in a certain ratio, enter the reactive distillation tower and react in the stripping section of the reactive distillation tower. The top temperature of the reactive distillation tower is controlled at 63-66°C and the pressure is normal pressure. The reaction produces ethyl methyl carbonate, diethyl carbonate and methanol. Dimethyl carbonate and methanol form an azeotrope and are distilled from the top of the tower. The azeotropic composition is changed by passing through a pressure distillation tower. The top temperature of the pressure distillation tower is controlled at 120-130°C and the pressure is 0.6-1.2 MPa. Crude dimethyl carbonate is obtained from the bottom of the pressure separation tower and returned to the reactive distillation tower for reuse. The top material of the pressure distillation tower enters the atmospheric distillation tower 1 for distillation, and methanol is obtained from the bottom of the tower. The methanol in the bottom of the atmospheric distillation tower 1 enters the methanol distillation unit 2 for further distillation to ensure high purity, and then is transported to the methanol filling unit 3 for filling and sale; The methanol distillation unit 2 includes a distillation kettle 201 and a condenser 202. The methanol obtained in the tower is heated and evaporated in the distillation kettle 201. The light component vaporizes and enters the condenser 202 for condensation and liquefaction. The heavy component methanol remains in the distillation kettle 201, thereby achieving the purpose of further purifying the methanol and improving the quality of the product. The methanol filling unit 3 includes a support platform 301, and a storage tank conveyor belt 302 is provided above the support platform 301. Methanol packaging tanks 3022 are placed on the storage tank conveyor belt 302. The methanol packaging tanks 3022 are placed at the top of the storage tank conveyor belt 302 and transported side by side to the filling position. After filling, they are sent away to achieve the purpose of continuous filling.

[0021] Example 2

[0022] Reference Figure 1-10 The difference between this embodiment and embodiment 1 is that a heating jacket is provided on the outside of the distillation kettle 201, a methanol discharge port 203 is provided at the bottom end of the distillation kettle 201, a top cover 204 is hinged on the top of the distillation kettle 201, an opening and closing cylinder 2041 is hinged on one side of the distillation kettle 201, and the output end of the opening and closing cylinder 2041 is hinged to the top cover 204. When the opening and closing cylinder 2041 is shortened, the top cover 204 can be driven to rotate and open relative to the distillation kettle 201, which is convenient for cleaning and maintenance of the interior of the distillation kettle 201. The opening and closing cylinder 2041 can be extended to close the top cover 204. A handwheel 2031 is installed on the methanol discharge port 203, and the handwheel 2031 is used to control the opening and closing of the methanol discharge port 203.

[0023] The distillation kettle 201 is provided with an agitator, and the power input shaft 2091 of the agitator extends above the top cover 204. A rotary motor 209 is fixed to the top of the top cover 204. The output shaft of the rotary motor 209 and the top of the power input shaft 2091 are both provided with pulleys, and a belt 2092 is used to transmit power between the two pulleys. When the rotary motor 209 is turned on, the power input shaft 2091 can be driven to rotate through the belt 2092, thereby driving the agitator in the distillation kettle 201 to rotate, stirring the liquid in the distillation kettle 201 and accelerating the distillation.

[0024] Example 3

[0025] Reference Figure 1-10 The difference between this embodiment and embodiment 2 is that an exhaust fan 2021 is provided at the top of the condensation box 202, and a material coil 206 is provided inside the exhaust fan 2021. The material coil 206 is connected to the exhaust port at the top of the top cover 204 through a connecting pipe 205. An exhaust buffer tank 2051 is installed on the connecting pipe 205. The bottom end of the material coil 206 is connected to the light component storage 208. A condensate coil 207 is installed inside the condensation box 202, and an air inlet is provided at the bottom end of the condensation box 202. During the distillation process, the light component with a lower boiling point vaporizes and enters the material coil 206 in the condenser 202 through the connecting pipe 205. The material coil 206 can increase the flow of the light component in the condenser 202 and improve the heat exchange effect. The low-temperature refrigerant is introduced into the condensate coil 207, and the exhaust fan 2021 is used to extract and exhaust the air to discharge the heat in time, thereby achieving the purpose of efficiently cooling the light component gas and liquefying it. The liquefied light component flows into the light component storage 208 for temporary storage.

[0026] Example 4

[0027] Reference Figure 1-10 The difference between this embodiment and embodiment 2 is that two mutually parallel limit baffles 3021 are installed directly above the storage tank conveyor belt 302, the spacing between the two limit baffles 3021 is adjustable, and the methanol packaging tank 3022 is placed between the two limit baffles 3021; By adjusting the distance between the two limit baffles 3021, the methanol packaging tank 3022 can be accurately clamped to achieve the purpose of positioning the methanol packaging tank 3022, ensuring that the injector 307 can be accurately aligned with the methanol packaging tank 3022 during filling, and at the same time ensuring the stability of the methanol packaging tank 3022 at the top of the tank conveyor belt 302, preventing the methanol packaging tank 3022 from tipping over.

[0028] The top of the support platform 301 is fixed with a first support column 303, the top of the first support column 303 is installed with a fixing frame 304, the top of the fixing frame 304 is fixed with a lifting cylinder 305, the output shaft of the lifting cylinder 305 is fixed with a lifting bracket 306, and the bottom of the lifting bracket 306 is fixed with multiple injectors 307; The lifting cylinder 305 can drive the injector 307 to move up and down. The number of injectors 307 corresponds to the methanol packaging cans 3022 placed during each filling. When the methanol packaging can 3022 moves to the filling position, the lifting cylinder 305 can drive the injector 307 to move downward, so that the injection needle 3074 at the bottom end of the injector 307 is inserted into the can mouth of the methanol packaging can 3022, and canning can be carried out.

[0029] Among them, a first rack 3087 is fixed to the bottom end of the lifting bracket 306, and a vertical slide rail 3081 is fixed to the top of the support platform 301 through a second support 308. A limited lifting frame 3082 is slidably installed on the vertical slide rail 3081, and a limited stopper 3083 and a second rack 3084 are respectively fixed on the limited lifting frame 3082. A first gear 3085 and a second gear 3086 are coaxially mounted on one side of the vertical slide rail 3081. The first gear 3085 is engaged with the second rack 3084, and the second gear 3086 is engaged with the first rack 3087. The diameter of the first gear 3085 is larger than that of the second gear 3086. The stop plate 3083 is used to stop the methanol packaging tank 3022 from moving further. When a row of methanol packaging tanks 3022 moves to the stop plate 3083, they cannot move further. This position can ensure that the methanol packaging tank 3022 is located directly below the liquid injector 307. When the lifting cylinder 305 extends and pushes the lifting bracket 306 downward, the liquid injector 307 moves downward. Since the first gear 3085 is engaged with the second rack 3084 and the second gear 3086 is engaged with the first rack 3087, the downward movement of the first rack 3087 will drive the second gear 3086 to rotate, thereby driving the first gear 3085 to rotate, and then the stop plate 3085 is driven by the engagement of the first gear 3085 with the second rack 3084. The plate 3083 moves upward. Since the diameter of the first gear 3085 is greater than the diameter of the second gear 3086, the speed at which the limit baffle 3083 moves upward is greater than the speed at which the injector 307 moves downward. When the injector 307 is at the highest height, the limit baffle 3083 is at the lowest height, and at this time, it can block the methanol packaging tank 3022. When the injector 307 is at the middle position and the injection needle 3074 has not yet been inserted into the methanol packaging tank 3022, the limit baffle 3083 moves upward to the middle position. At this time, the height of the limit baffle 3083 is greater than the height of the methanol packaging tank 3022 and will not block the methanol packaging tank 3022. When the injector 307 is at the lowest position, allowing the injection needle 3074 to be inserted into the methanol packaging tank 3022, the limit baffle 3083 moves to the highest height, thereby ensuring that after filling is completed, the methanol packaging tank 3022 filled with methanol can be removed.

[0030] The injector 307 includes a fixed portion 3071. A lifting sleeve 3072 is provided on the bottom end of the fixed portion 3071. A return spring 3077 is provided between the fixed portion 3071 and the lifting sleeve 3072. An injection tube 3073 is fixed to the bottom end of the fixed portion 3071. The bottom end of the injection tube 3073 extends below the lifting sleeve 3072 and is provided with an injection needle 3074. A methanol inlet 3076 is fixed to the lifting sleeve 3072. An injection opening 3075 corresponding to the methanol inlet 3076 is provided on the side wall of the injection tube 3073. When the return spring 3077 is in an uncompressed state, the injection opening 3075 and the methanol inlet 3076 are staggered in height, thereby achieving the purpose of automatic sealing. During filling, the injection needle 3074 is inserted into the mouth of the methanol packaging tank 3022. When it continues to move downward, the return spring 3077 is compressed and the lifting sleeve 3072 moves upward, causing the methanol inlet 3076 to move upward and align with the methanol inlet 3076. At this time, filling can be carried out. After the filling is completed, the injection needle 3074 leaves the methanol packaging tank 3022, and the return spring 3077 pushes the lifting sleeve 3072 to reset, and the height of the injection opening 3075 and the methanol inlet 3076 will be automatically staggered again.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In the present invention, unless otherwise expressly specified or limited, terms such as "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0033] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by a person skilled in the art. The provision of power is also common knowledge in the art. The present invention is mainly used to protect mechanical devices, so the control method and circuit connection are not explained in detail in the present invention.

[0034] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A refining and purification system for methanol production, comprising a reactive distillation tower, a pressure distillation tower and an atmospheric distillation tower (1), a methanol distillation unit (2) and a methanol filling unit (3), characterized in that: The atmospheric distillation tower (1) is equipped with a reboiler (103), a tower top condenser (101) and a tower top buffer tank (102); The methanol distillation unit (2) includes a distillation kettle (201) and a condenser (202); The methanol filling unit (3) comprises a support platform (301), a storage tank conveyor belt (302) is provided above the support platform (301), and a methanol packaging tank (3022) is placed on the storage tank conveyor belt (302).

2. A refining and purification system for methanol production according to claim 1, characterized in that: The distillation kettle (201) is provided with a heating jacket on the outside, a methanol discharge port (203) is provided at the bottom of the distillation kettle (201), a top cover (204) is hingedly connected to the top of the distillation kettle (201), an opening and closing cylinder (2041) is hingedly connected to one side of the distillation kettle (201), and an output end of the opening and closing cylinder (2041) is hingedly connected to the top cover (204).

3. A refining and purification system for methanol production according to claim 2, characterized in that: The distillation kettle (201) is provided with an agitator, and the power input shaft (2091) of the agitator extends to the top of the top cover (204). A rotating motor (209) is fixed to the top of the top cover (204). The output shaft of the rotating motor (209) and the top of the power input shaft (2091) are both provided with pulleys, and the two pulleys are driven by a belt (2092).

4. The refining and purification system for methanol production according to claim 1, characterized in that: An exhaust fan (2021) is provided at the top of the condensation box (202), a material coil (206) is provided inside the exhaust fan (2021), and the material coil (206) is connected to the exhaust port at the top of the top cover (204) through a connecting pipe (205).

5. A refining and purification system for methanol production according to claim 4, characterized in that: An exhaust buffer tank (2051) is installed on the connecting pipe (205), and the bottom end of the material coil (206) is connected to the light component storage (208).

6. A refining and purification system for methanol production according to claim 5, characterized in that: A condensate coil (207) is installed inside the condensation box (202), and an air inlet is provided at the bottom end of the condensation box (202).

7. A refining and purification system for methanol production according to claim 2, characterized in that: Two mutually parallel limiting baffles (3021) are installed directly above the storage tank conveyor belt (302), and the distance between the two limiting baffles (3021) is adjustable. The methanol packaging tank (3022) is placed between the two limiting baffles (3021).

8. The refining and purification system for methanol production according to claim 2, characterized in that: A first support column (303) is fixed to the top of the support platform (301), a fixing frame (304) is installed on the top of the first support column (303), a lifting cylinder (305) is fixed to the top of the fixing frame (304), a lifting bracket (306) is fixed to the output shaft of the lifting cylinder (305), and a plurality of liquid injectors (307) are fixed to the bottom of the lifting bracket (306).

9. A refining and purification system for methanol production according to claim 8, characterized in that: A first rack (3087) is fixed to the bottom end of the lifting bracket (306), a vertical slide rail (3081) is fixed to the top end of the support platform (301) through a second support (308), a limited lifting frame (3082) is slidably mounted on the vertical slide rail (3081), a limited baffle (3083) and a second rack (3084) are respectively fixed on the limited lifting frame (3082), a first gear (3085) and a second gear (3086) are coaxially mounted on one side of the vertical slide rail (3081), the first gear (3085) is meshed with the second rack (3084), the second gear (3086) is meshed with the first rack (3087), and the diameter of the first gear (3085) is larger than the diameter of the second gear (3086).

10. A refining and purification system for methanol production according to claim 8, characterized in that: The injector (307) comprises a fixed portion (3071), a lifting sliding sleeve at the bottom end of the fixed portion (3071) is provided with a lifting sleeve (3072), and a return spring (3077) is provided between the fixed portion (3071) and the lifting sleeve (3072), an injection tube (3073) is fixed at the bottom end of the fixed portion (3071), the bottom end of the injection tube (3073) extends to the bottom of the lifting sleeve (3072) and is provided with an injection needle (3074), a methanol inlet (3076) is fixed on the lifting sleeve (3072), and an injection opening (3075) corresponding to the methanol inlet (3076) is opened on the side wall of the injection tube (3073).

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