Carbonyl sulfide production device adopting external electric heater

Abstract

The utility model belongs to a carbonyl sulfide production device adopting an external electric heater. Comprising a sulfide raw material supply unit, and the sulfide raw material supply unit is connected with a product filling row through a light component removal rectification unit and a heavy component removal rectification unit; a light component removal rectifying tower is arranged in the light component removal rectifying unit, a heavy component removal rectifying tower is arranged in the heavy component removal rectifying unit, and external ammonia electric heating reboiler units are arranged at the inner lower parts of the light component removal rectifying tower and the heavy component removal rectifying tower; the external ammonia electric heating reboiler unit comprises rectifying tower reboilers arranged at the lower parts in the light component removal rectifying tower and the heavy component removal rectifying tower, an inlet of each rectifying tower reboiler is connected with an outlet of an external liquid ammonia electric heater through a pipeline, and an outlet of each rectifying tower reboiler is connected with an inlet of the external liquid ammonia electric heater through a pipeline; the device has the characteristics that the temperature is accurately controlled, and the thermal load of the rectifying tower is stabilized, so that the purity of a product is ensured while sulfide is separated and purified.

Description

Technical Field

[0001] The utility model belongs to the technical field of carbonyl sulfide purification, and particularly relates to a carbonyl sulfide production device adopting an external electric heater. Background Technique

[0002] Sulfides mainly refer to carbonyl sulfide, which is mainly used in the etching field of line miniaturization in 12-inch semiconductor factories and ultra-large-scale integrated circuit factories. Its etching effect in dry etching is very obvious, and it has broad application prospects and practical value in the manufacture of memories and chips.

[0003] Currently, the common method for purifying and preparing electronic-grade carbonyl sulfide is by rectification using an internal reboiler. Taking the purification and preparation of carbonyl sulfide as an example, during the rectification and purification process, the rectification column obtains heat from the reboiler. The temperature threshold range provided by the conventional reboiler to the rectification column is relatively large. When the temperature is too low, rectification operation cannot be achieved. When the temperature is too high, high-temperature decomposition will occur at the contact surface between the carbonyl sulfide liquid and the reboiler, resulting in an increase in the contents of CO2 and CS2 in the carbonyl sulfide. The rectification load is large and the energy consumption is high, which has a certain impact on the product purity. Based on this, the traditional rectification technology cannot guarantee the purity of sulfide products. Content of the Utility Model

[0004] The utility model provides a carbonyl sulfide production device adopting an external electric heater to solve the technical problems raised in the above background technique.

[0005] The technical solution of the utility model is as follows:

[0006] A carbonyl sulfide production device adopting an external electric heater includes a sulfide raw material supply unit, and the sulfide raw material supply unit is connected to a product filling and discharging port through a light component removal rectification unit and a heavy component removal rectification unit; a light component removal rectification tower is arranged in the light component removal rectification unit, a heavy component removal rectification tower is arranged in the heavy component removal rectification unit, and an external ammonia electric heating reboiler unit is arranged at the lower inner part of the light component removal rectification tower and the heavy component removal rectification tower; the external ammonia electric heating reboiler unit at least includes a rectification tower reboiler arranged at the lower inner part of the light component removal rectification tower and the heavy component removal rectification tower. The inlet of the rectification tower reboiler is connected to the outlet of an external liquid ammonia electric heater through a pipeline, the outlet of the rectification tower reboiler is connected to the inlet of the external liquid ammonia electric heater through a pipeline, and the liquid supplement port of the external liquid ammonia electric heater is connected to an external liquid ammonia storage tank.

[0007] The beneficial effects of the present utility model are as follows: The present utility model abandons the traditional method of preparing sulfides by rectification and concentration, but adopts rectification and sets reboilers at the lower inner parts of the light removal rectification tower and the heavy removal rectification tower to provide heat, and at the same time adopts the form of an external liquid ammonia electric heater to achieve precise temperature control, avoiding high-temperature decomposition at the contact surface between the carbonyl sulfide liquid and the reboiler, so as to separate and purify sulfides while ensuring the purity of the product. Taking the carbonyl sulfide product as an example, its purity is not less than 99.995%.

[0008] Preferably, the light removal rectification unit includes a light removal rectification tower. An integrally structured light removal gas-liquid separator is provided at the top of the light removal rectification tower. The gas phase outlet of the light removal rectification tower is connected to the inlet of the light removal gas-liquid separator through the first heat exchange channel of the top condenser. The liquid phase outlet of the light removal gas-liquid separator is connected to the reflux port of the light removal rectification tower of the light removal rectification tower. The liquid phase outlet at the bottom of the light removal rectification tower is connected to the heavy removal rectification unit.

[0009] Preferably, the heavy removal rectification unit includes a heavy removal rectification tower. An integrally structured heavy removal gas-liquid separator is provided at the top of the heavy removal rectification tower. The gas phase outlet of the heavy removal rectification tower is connected to the inlet of the heavy removal gas-liquid separator through the second heat exchange channel of the top condenser. The liquid phase outlet at the bottom of the heavy removal gas-liquid separator is connected to the reflux port of the heavy removal rectification tower of the heavy removal rectification tower. The liquid phase outlet in the middle of the heavy removal gas-liquid separator is connected to the product filling row.

[0010] Preferably, the external liquid ammonia tank is connected to the shell side inlet of the top condenser, and the shell side outlet of the top condenser is connected to the cryogenic working condition ice machine.

[0011] Preferably, the gas phase outlet of the light removal gas-liquid separator is connected to the inlet of the water washing desulfurization device through the first channel of the heat exchanger; the sulfide raw material supply unit includes a crude carbonyl sulfide storage tank with a first regulating valve.

[0012] Preferably, the gas phase outlet of the heavy removal gas-liquid separator is connected to the inlet of the water washing desulfurization device through the second channel of the heat exchanger, and the liquid phase outlet at the bottom of the heavy removal rectification tower is connected to the inlet of the water washing desulfurization device through the third channel of the heat exchanger.

[0013] Preferably, a gas phase balance pipeline for stabilizing the tower pressure of the heavy removal rectification tower is provided between the gas phase outlet of the heavy removal rectification tower and the gas phase outlet of the heavy removal gas-liquid separator.

[0014] Preferably, the inlet of the heavy removal gas-liquid separator is arranged on one side of the heavy removal gas-liquid separator, the liquid phase outlet at the bottom of the heavy removal gas-liquid separator and the liquid phase outlet in the middle of the heavy removal gas-liquid separator are arranged on the other side of the heavy removal gas-liquid separator, and an overflow plate is provided in the middle of the heavy removal gas-liquid separator.

[0015] Preferably, a second regulating valve is provided at the inlet of the reboiler of the rectification column, a third regulating valve is provided between the liquid ammonia supplement port of the external liquid ammonia storage tank and the liquid ammonia electric heater, and a fourth regulating valve is provided at the shell-side inlet of the external liquid ammonia storage tank and the top condenser.

[0016] A carbonyl sulfide production device using an external electric heater made according to the above scheme can accurately control the temperature by setting an external ammonia electric heating reboiler, improve the stability of the rectification heat load, and achieve the purpose of ensuring the purity of the sulfide product; the present invention can be mainly applied to the rectification and purification of carbonyl sulfide. Among them, the light component removal rectification column and the light component removal gas-liquid separator are integrally designed, and the heavy component removal rectification column and the heavy component removal gas-liquid separator are integrally designed. The above design can ensure the verticality of the equipment, prevent the pipeline from being pulled and cracked at low temperature, and save the floor area of the equipment; in the present utility model, the light component removal rectification column and the heavy component removal rectification column share the same top condenser, which can not only save the equipment purchase cost, but also achieve the characteristics of highly integrated cold energy and controllable temperature zones. An overflow plate is provided in the heavy component removal gas-liquid separator, which can preferably ensure that the reflux liquid enters the heavy component removal rectification column to realize the stable operation of the heavy component removal rectification column. Further, the product is extracted by a middle-draw design to ensure the purity of the product; it has the advantages of reducing the investment cost, saving the floor area of the equipment, realizing the long-term stable operation of the system, improving the stability of the rectification heat load, and ensuring the purity of the sulfide product. Brief Description of the Drawings

[0017] Figure 1 It is a structural schematic diagram of the present utility model.

[0018] Reference numerals in the figure: 1, product filling row; 2, light component removal rectification column; 3, heavy component removal rectification column; 4, reboiler of the rectification column; 5, external liquid ammonia electric heater; 6, external liquid ammonia storage tank; 7, light component removal gas-liquid separator; 8, top condenser; 9, reflux port of the light component removal rectification column; 10, heavy component removal gas-liquid separator; 11, reflux port of the heavy component removal rectification column; 12, ice machine under low-temperature working conditions; 13, heat exchanger; 14, water washing desulfurization device; 15, first regulating valve; 16, crude carbonyl sulfide storage tank; 17, second regulating valve; 18, gas-phase balance pipeline; 19, overflow plate; 20, third regulating valve; 21, fourth regulating valve. Detailed Embodiments

[0019] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be described in detail below with reference to the drawings. The description in this part is only exemplary and explanatory, and should not have any restrictive effect on the protection scope of the present utility model.

[0020] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] It should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model 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 construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0022] Furthermore, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0023] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] Such as Figure 1As shown in the figure, the utility model is a carbonyl sulfide production device using an external electric heater, which includes a sulfide raw material supply unit. The sulfide raw material supply unit is connected to the product filling row 1 through a light component removal rectification unit and a heavy component removal rectification unit. A light component removal rectification tower 2 is arranged in the light component removal rectification unit, and a heavy component removal rectification tower 3 is arranged in the heavy component removal rectification unit. An external ammonia electric heating reboiler unit is arranged at the lower inner part of the light component removal rectification tower 2 and the heavy component removal rectification tower 3. The external ammonia electric heating reboiler unit at least includes a rectification tower reboiler 4 arranged at the lower inner part of the light component removal rectification tower 2 and the heavy component removal rectification tower 3. The inlet of the rectification tower reboiler 4 is connected to the outlet of an external liquid ammonia electric heater 5 through a pipeline, the outlet of the rectification tower reboiler 4 is connected to the inlet of the external liquid ammonia electric heater 5 through a pipeline, and the liquid replenishing port of the external liquid ammonia electric heater 5 is connected to an external liquid ammonia replenishing tank 6. Through the above settings, the utility model can realize the light component removal and heavy component removal treatment of the sulfide raw material to achieve the concentration and purification of the sulfide. The utility model is provided with an external ammonia electric heating reboiler unit at the lower inner part of the light component removal rectification tower 2 and the heavy component removal rectification tower 3 to realize the precise control of the heat source temperature of the rectification tower, so as to achieve the advantages of improving the stability of the heat load of the rectification tower and ensuring the purity of the sulfide product. The external liquid ammonia electric heater 5 described in the utility model is a horizontal heat-conducting oil circulation electric heater. The external liquid ammonia electric heater 5 described in the invention is a horizontal heat-conducting oil circulation electric heater, which can achieve high temperature control accuracy, uniform temperature dissipation, and avoid the high-temperature decomposition of the carbonyl sulfide liquid at the liquid crystal point contact surface when encountering a high-temperature reboiler.

[0025] Furthermore, the light component removal rectification unit includes a light component removal rectification tower 2. A light component removal gas-liquid separator 7 with an integral structure is arranged at the top of the light component removal rectification tower 2. The gas phase outlet of the light component removal rectification tower 2 is connected to the inlet of the light component removal gas-liquid separator 7 through the first heat exchange channel of a top condenser 8. The liquid phase outlet of the light component removal gas-liquid separator 7 is connected to the light component removal rectification tower reflux port 9 of the light component removal rectification tower 2. The liquid phase outlet at the bottom of the light component removal rectification tower 2 is connected to the heavy component removal rectification unit. In the utility model, the light component removal rectification tower 2 and the light component removal gas-liquid separator 7 are of an integral structure, and the light component removal gas-liquid separator 7 is arranged at the top of the light component removal rectification tower 2. The above settings have the characteristics of saving space, improving the verticality of the equipment, and preventing the pipeline from being pulled apart at low temperature.

[0026] Further, the heavy component removal rectification unit includes a heavy component removal rectification column 3. At the top of the heavy component removal rectification column 3, there is an integrated heavy component removal gas-liquid separator 10. The gas phase outlet of the heavy component removal rectification column 3 is connected to the inlet of the heavy component removal gas-liquid separator 10 through the second heat exchange channel of the top condenser 8. The liquid phase outlet at the bottom of the heavy component removal gas-liquid separator 10 is connected to the reflux port 11 of the heavy component removal rectification column 3 of the heavy component removal rectification column 3. The liquid phase outlet in the middle of the heavy component removal gas-liquid separator 10 is connected to the product filling row 1. In the present utility model, the heavy component removal rectification column 3 and the heavy component removal gas-liquid separator 10 are of an integrated structure, and the heavy component removal gas-liquid separator 10 is arranged at the top of the heavy component removal rectification column 3. The above arrangement has the characteristics of improving the verticality of the equipment and preventing the pipeline from being pulled and cracked at low temperatures on the basis of saving space.

[0027] Further, the external liquid ammonia tank 6 is connected to the shell side inlet of the top condenser 8, and the shell side outlet of the top condenser 8 is connected to the cryogenic condition ice machine 12. In the present utility model, the gas phases in the light component removal rectification column 2 and the heavy component removal rectification column 3 jointly enter the top condenser 8 for condensation, and the liquid ammonia in the external liquid ammonia tank 6 enters the shell side of the top condenser 8 to provide cooling capacity; the cooling capacity of the present utility model is highly integrated, having the characteristics of controllable temperature zone and at the same time achieving the characteristic of saving the floor area of the equipment.

[0028] Further, the gas phase outlet of the light component removal gas-liquid separator 7 is connected and communicated with the inlet of the water washing desulfurization device 14 through the first channel of the heat exchanger 13; the sulfide raw material supply unit includes a crude carbonyl sulfide storage tank 16 with a first regulating valve 15. The gas phase outlet of the heavy component removal gas-liquid separator 10 is connected and communicated with the inlet of the water washing desulfurization device 14 through the second channel of the heat exchanger 13, and the liquid phase outlet at the bottom of the heavy component removal rectification column 3 is connected and communicated with the inlet of the water washing desulfurization device 14 through the third channel of the heat exchanger 13. In the present utility model, there is also a water washing desulfurization device 14, so that the gas phase of the light component removal gas-liquid separator 7, the gas phase of the heavy component removal gas-liquid separator 10 and the liquid phase at the bottom of the heavy component removal rectification column 3 enter the water washing desulfurization device 14 for water washing desulfurization, thereby effectively recovering the sulfide in the vent air-liquid and reducing the advantage of air pollution.

[0029] Further, a gas phase balance pipeline 18 for stabilizing the tower pressure of the heavy component removal rectification column 10 is arranged between the gas phase outlet of the heavy component removal rectification column 3 and the gas phase outlet of the heavy component removal gas-liquid separator 10. By arranging the gas phase balance pipeline 18, the present utility model can achieve the purpose of stabilizing the tower pressure of the heavy component removal rectification column 3.

[0030] Furthermore, the inlet of the heavy component removal gas-liquid separator 10 is arranged on one side of the heavy component removal gas-liquid separator 10, the liquid phase outlets at the bottom and in the middle of the heavy component removal gas-liquid separator 10 are arranged on the other side of the heavy component removal gas-liquid separator 10, and an overflow plate 19 is provided in the middle inside the heavy component removal gas-liquid separator 10. In the heavy component removal gas-liquid separator 10 of the present utility model, an overflow plate 19 is provided. By providing the overflow plate 19, it can preferably ensure that the reflux liquid flows back into the heavy component removal rectification tower 3. By designing a product middle extraction pipeline in the middle of the heavy component removal gas-liquid separator 10, a regulating valve can be designed on the middle extraction pipeline to double-control and ensure the product purity and output.

[0031] Furthermore, a second regulating valve 17 is provided at the inlet of the rectification tower reboiler 4, a third regulating valve 21 is provided between the liquid ammonia replenishment ports of the external liquid ammonia storage tank 6 and the external liquid ammonia electric heater 5, and a fourth regulating valve 22 is provided at the shell-side inlet of the external liquid ammonia storage tank 6 and the top condenser 8. In the present utility model, the liquid ammonia in the external liquid ammonia storage tank 6 can simultaneously enter the rectification tower reboiler 4 and the external liquid ammonia electric heater 5 in the light component removal rectification tower 2, as well as the rectification tower reboiler 4 and the external liquid ammonia electric heater 5 in the heavy component removal rectification tower 3 to realize parallel regulation of energy. After providing heat, it exchanges heat with the tower bottom liquid and is liquefied, and then enters the respective electric heaters to form a recycling utilization to achieve highly integrated energy.

[0032] The present utility model is used for the rectification and purification of carbonyl sulfide. When using the present utility model to rectify and purify carbonyl sulfide, the process is as follows: Step 1: The crude carbonyl sulfide liquid is cached in the crude carbonyl sulfide storage tank 16 and enters the light component removal rectification tower 2 through the first regulating valve 15. It is rectified by the corresponding external liquid ammonia electric heater 5 and the top condenser 8 in the light component removal rectification tower 2, respectively, providing heat and cold. The temperature of the crude carbonyl sulfide liquid is: -4 to -10 °C, and the flow rate is: 10 Nm 3 / h, the gas fraction is: 0, the CO2 content in the raw crude carbonyl sulfide liquid is: 100 - 500 ppm, the CS2 content is 50 - 200 ppm, and the H2S content is: 0.1% - 0.5%; Step 2: The gas phase after the first rectification and purification of the raw material liquid entering the light removal rectification column 2 in Step 1 enters the top condenser 8 and is partially liquefied into the light removal gas-liquid separator 7. The liquid phase of the light removal gas-liquid separator 7 flows back into the light removal rectification column 2; the bottom liquid in the light removal rectification column 2 enters the heavy removal rectification column 3 for secondary rectification; the temperature of the bottom liquid in the light removal rectification column 2 is: -5 to -10 °C, and the H2S mole fraction is: 0.1 to 1 ppm; Step 3: The liquid ammonia from the external supplementary liquid ammonia tank 6 in Step 1 enters the external liquid ammonia electric heater 5. After being heated by the external liquid ammonia electric heater 5, the gaseous ammonia enters the rectification column reboiler 4 through the second regulating valve 17 to provide heat for the light removal rectification column 2. After exchanging heat with the liquid in the bottom of the light removal rectification column 2, it is liquefied into the external liquid ammonia electric heater 5 to form a cycle; the heat load of the external liquid ammonia electric heater 5 is: 30 - 50 kw, and the temperature of the gaseous ammonia is: 5 - 10 °C; Step 4: The gas phase of the light removal gas-liquid separator 7 in Step 2 exchanges heat through the heat exchanger 13 and then enters the water washing desulfurization device 14; the inlet temperature of the sulfide water washing device 4 is: 10 to -20 °C, and the carbonyl sulfide content is 97 - 99%; Step 5: The liquid phase entering the heavy removal rectification column 3 in Step 2 is rectified in the heavy removal rectification column 3 with the external liquid ammonia electric heater 5 and the top condenser 8 providing heat and cold respectively. The gas phase after rectification enters the top condenser 8 and is condensed into a liquid phase. The liquid phase enters the heavy removal gas-liquid separator 10 for gas-liquid separation. The gas phase after gas-liquid separation exchanges heat through the heat exchanger 13 and then enters the water washing desulfurization device 14; a part of the liquid phase after gas-liquid separation flows back into the heavy removal rectification column 3; the temperature of the carbonyl sulfide in the gas phase outlet of the heavy removal gas-liquid separator 10 is: -12 to -18 °C, and the flow rate is: 0.5 - 1 Nm 3 / h; Step 6: Another part of the liquid phase after gas-liquid separation in Step 5 enters the product filling row 1; the temperature of the carbonyl sulfide entering the product filling row 1 is: -12 to -18 °C, and the carbonyl sulfide purity is: 99.995% - 99.999%; Step 7: The liquid ammonia from the external supplementary liquid ammonia tank 6 in Step 5 enters the corresponding external liquid ammonia electric heater 5 of the heavy removal rectification column 3. After being heated by the external liquid ammonia electric heater 5, the gaseous ammonia enters the rectification column reboiler 4 through the second regulating valve 17 to provide heat for the heavy removal rectification column 3. After exchanging heat with the liquid in the bottom of the heavy removal rectification column 3, it is liquefied into the external liquid ammonia electric heater 5 to form a cycle; the heat load of the external liquid ammonia electric heater 5 corresponding to the heavy removal rectification column 3 is: 20 - 40 kw, and the temperature of the gaseous ammonia is: 0 - 5 °C. The carbonyl sulfide product obtained through the above process has a purity not lower than 99.995%, meeting the requirement of the quality index of "Electronic Gas Carbonyl Sulfide" ≥ 99.995%.

[0033] The standard parts used in this application document can all be purchased from the market, and can also be customized according to the descriptions in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art. The control method is automatically controlled by a controller, and the control circuit of the controller can be realized by simple programming by those skilled in the art, which belongs to the common general knowledge in this field. Moreover, this utility model is mainly used to protect mechanical devices, so the control method and circuit connection of this utility model will not be explained in detail. And the peripheral controller mentioned in the specification can play a control role for the electrical components mentioned in this article, and this peripheral controller is a conventional known device.

[0034] It should be noted that in this article, the term "including", "comprising", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article, or device.

[0035] In this article, specific examples are used to elaborate on the principle and implementation manner of this utility model. The description of the above examples is only used to help understand the method and its core idea of this utility model. The above are only the preferred implementation manners of this utility model. It should be pointed out that due to the limited nature of language expression and the objectively infinite specific structures, for those of ordinary skill in the art, without departing from the principle of this utility model, several improvements, refinements, or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, changes, or combinations, or directly applying the concept and technical solution of the utility model to other occasions without improvement, shall all be regarded as the protection scope of this utility model.

Claims

1. A carbonyl sulfide production device using an external electric heater, comprising a sulfide raw material supply unit, characterized in that: The sulfide raw material supply unit is connected to the product filling row (1) through a light component removal rectification unit and a heavy component removal rectification unit; The light component removal rectification unit is provided with a light component removal rectification column (2), and the heavy component removal rectification unit is provided with a heavy component removal rectification column (3). An external ammonia electric heating reboiler unit is provided at the lower inner part of the light component removal rectification column (2) and the heavy component removal rectification column (3); The external ammonia electric heating reboiler unit at least includes a rectification column reboiler (4) provided at the lower inner part of the light component removal rectification column (2) and the heavy component removal rectification column (3). The inlet of the rectification column reboiler (4) is connected to the outlet of an external liquid ammonia electric heater (5) through a pipeline, the outlet of the rectification column reboiler (4) is connected to the inlet of the external liquid ammonia electric heater (5) through a pipeline, and the liquid replenishing port of the external liquid ammonia electric heater (5) is connected to an external liquid ammonia replenishing tank (6).

2. The carbonyl sulfide production device using an external electric heater according to claim 1, characterized in that: The light component removal rectification unit includes a light component removal rectification column (2). A light component removal gas-liquid separator (7) with an integral structure is provided at the top of the light component removal rectification column (2). The gas phase outlet of the light component removal rectification column (2) is connected to the inlet of the light component removal gas-liquid separator (7) through the first heat exchange channel of a top condenser (8). The liquid phase outlet of the light component removal gas-liquid separator (7) is connected to the light component removal rectification column reflux port (9) of the light component removal rectification column (2). The liquid phase outlet at the bottom of the light component removal rectification column (2) is connected to the heavy component removal rectification unit.

3. The carbonyl sulfide production device using an external electric heater according to claim 1 or 2, characterized in that: The heavy component removal rectification unit includes a heavy component removal rectification column (3). A heavy component removal gas-liquid separator (10) with an integral structure is provided at the top of the heavy component removal rectification column (3). The gas phase outlet of the heavy component removal rectification column (3) is connected to the inlet of the heavy component removal gas-liquid separator (10) through the second heat exchange channel of the top condenser (8). The liquid phase outlet at the bottom of the heavy component removal gas-liquid separator (10) is connected to the heavy component removal rectification column reflux port (11) of the heavy component removal rectification column (3). The liquid phase outlet in the middle of the heavy component removal gas-liquid separator (10) is connected to the product filling row (1).

4. The carbonyl sulfide production device using an external electric heater according to claim 3, wherein: The external liquid ammonia replenishing tank (6) is connected to the shell side inlet of the top condenser (8), and the shell side outlet of the top condenser (8) is connected to a low-temperature working condition ice machine (12).

5. The carbonyl sulfide production device using an external electric heater according to claim 2, wherein: The gas phase outlet of the light component removal gas-liquid separator (7) is connected to the inlet of a water washing desulfurization device (14) through the first channel of a heat exchanger (13); The sulfide raw material supply unit includes a crude carbonyl sulfide storage tank (16) with a first regulating valve (15).

6. The carbonyl sulfide production device using an external electric heater according to claim 3, characterized in that: The gas phase outlet of the heavy component removal gas-liquid separator (10) is connected to the inlet of the water washing desulfurization device (14) through the second channel of the heat exchanger (13), and the liquid phase outlet at the bottom of the heavy component removal rectification column (3) is connected to the inlet of the water washing desulfurization device (14) through the third channel of the heat exchanger (13).

7. The carbonyl sulfide production device using an external electric heater according to claim 6, characterized in that: A gas phase balance pipeline (18) for stabilizing the tower pressure of the heavy component removal rectification column (3) is provided between the gas phase outlet of the heavy component removal rectification column (3) and the gas phase outlet of the heavy component removal gas-liquid separator (10).

8. The carbonyl sulfide production device using an external electric heater according to claim 3, characterized in that: The inlet of the heavy component removal gas-liquid separator (10) is provided on one side of the heavy component removal gas-liquid separator (10), the liquid phase outlet at the bottom of the heavy component removal gas-liquid separator (10) and the liquid phase outlet in the middle of the heavy component removal gas-liquid separator (10) are provided on the other side of the heavy component removal gas-liquid separator (10), and an overflow plate (19) is provided in the middle of the heavy component removal gas-liquid separator (10).

9. The carbonyl sulfide production device using an external electric heater according to claim 4, characterized in that: A second regulating valve (17) is provided at the inlet of the rectifying column reboiler (4), a third regulating valve (20) is provided between the liquid ammonia replenishing ports of the external liquid ammonia replenishing tank (6) and the external liquid ammonia electric heater (5), and a fourth regulating valve (21) is provided at the shell side inlet of the external liquid ammonia replenishing tank (6) and the top condenser (8).

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