Multifunctional efficient rectification recovery unit

Abstract

According to the multifunctional high-efficiency rectification recovery unit, an over-limit high-efficiency solvent rectification tower system is mainly used for increasing the concentration of an organic solvent and removing high-boiling and insoluble substances in the solvent, and normal-pressure operation is carried out; comprising a heater A (1), a separator A (2), a rectifying tower A (3), a condenser A (4), a diaphragm pump C (5), a cooler A (6), a liquid collector A (7), a liquid collector B (8) and a diaphragm pump B (9). The main function of the single-effect external circulation solvent concentrator system is to perform vacuum evaporation on materials containing organic solvents at the evaporation temperature of 40-45 DEG C in a vacuum state; comprising a heater B (10), a separator B (11), a cooler B (12) and a liquid collector C (13). The system uses tower top steam in the solvent rectification process as a heat source for the vacuum concentrator, so that the heat efficiency is improved, and the loss of steam and cooling water is reduced. The system integrates solvent concentration and solvent rectification, solvent vacuum concentration and solvent normal-pressure rectification in materials are carried out at the same time, and the discharging speed of the materials is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of high-efficiency distillation recovery units, in particular to a multifunctional high-efficiency distillation recovery unit. Background Art

[0002] Organic solvents such as benzene, toluene, butyl acetate, ethyl acetate, dichloromethane, and butanol are widely used in the petroleum, chemical, pharmaceutical, and electronics industries. Organic solvents have low boiling points, are highly volatile, and are difficult to recycle, causing significant environmental pollution and potentially causing significant economic losses. Traditionally, organic solvents have been recovered by distillation, but this method consumes a large amount of heat energy. With rising energy prices, the advantages of traditional organic solvent distillation recovery have become less and less significant. Furthermore, commonly used energy-saving methods, such as reducing the reflux ratio, changing the tower plates and packing, and preheating the raw materials, are subject to various restrictions, resulting in poor energy-saving results. Summary of the Invention

[0003] In order to solve the above problems in the prior art, the present invention provides a multifunctional and efficient distillation recovery unit.

[0004] A multifunctional high-efficiency distillation recovery unit comprises an over-limit high-efficiency solvent distillation tower system and a single-effect external circulation solvent concentrator system.

[0005] The main function of the ultra-limited high-efficiency solvent distillation tower system is to increase the concentration of organic solvents and remove high-boiling and insoluble substances in the solvent. It operates at normal pressure. It includes: heater A1, separator A2, distillation tower A3, condenser A4, diaphragm pump C5, cooler A6, liquid collector A7, liquid collector B8, diaphragm pump B9; industrial steam is introduced into heater A1 to heat the liquid at the bottom of heater A1 and separator A2. The low-boiling point liquid enters distillation tower A3 after vaporization, and reaches the top of distillation tower A3 through the filler in distillation tower A3 (the tower body of distillation tower A3 can be stacked according to process requirements); distillation tower A3 tower The vapor generated at the top enters condenser A4 for cooling. The ethanol vapor condenses into liquid and enters liquid collector B8. It then flows through diaphragm pump C5 and refluxes to the top of distillation tower A3, where it exchanges vapor and liquid with the evaporated ethanol vapor to achieve equilibrium and maintain an appropriate ratio and concentration. The liquid at the bottom of distillation tower A3 enters liquid collector A7 and flows through diaphragm pump B9 back to the top of distillation tower A3 for secondary heating. After the ethanol vapor at the top of distillation tower A3 reaches an appropriate concentration and condenses, a portion of the liquid, if qualified, is transported out of the system as the finished product through cooler A6, while the remaining portion continues to reflux to maintain system equilibrium.

[0006] The main function of the single-effect external circulation solvent concentrator system is to perform vacuum evaporation on materials containing organic solvents under vacuum conditions, with an evaporation temperature of 40-45°C; it includes: heater B10, separator B11, cooler B12, and liquid collector C13; when used alone, separate steam is required to heat the heater B10 and separator B11; the material vapor generated by evaporation of the separator B11 is condensed by the cooler B12 and then stored in the lower part of the liquid collector C13; the uncondensed gas in the system is cooled twice by the cooler B12 along with the vacuum, and the liquid flows back to the liquid collector C13; the non-condensable gas is discharged out of the system along with the vacuum.

[0007] The technical solution adopted by the present invention to solve its technical problem is: The present invention also has the following additional technical features: As a further specific optimization of the technical solution of the present invention: when the two sets of equipment are used in combination, industrial steam is introduced into the ultra-high-efficiency solvent distillation tower heater A1 to heat the liquid at the bottom of the heater A1 and the separator A2. After the low-boiling point liquid is vaporized, it enters the distillation tower A3 and reaches the top of the distillation tower A3 through the filler in the tower body (the distillation tower body is stacked according to process requirements). The steam from the top of the tower does not pass through the condenser A4, but directly enters the single-effect external circulation solvent concentrator heater B10 to heat the single-effect external circulation solvent concentrator. After heating, the condensed organic solvent enters liquid collector B8 and flows through diaphragm pump C5 back to the top of distillation tower A3, where it undergoes vapor-liquid exchange with the evaporated ethanol vapor to achieve equilibrium and maintain an appropriate ratio and concentration. The liquid at the bottom of distillation tower A3 enters liquid collector A7 and flows through diaphragm pump B9 back to the top of distillation tower A3 for secondary heating. After the ethanol vapor at the top of distillation tower A3 reaches an appropriate concentration and condenses, a portion of the liquid, if qualified, is transported out of the system as the finished product through cooler A6, while the remaining portion continues to reflux to maintain system equilibrium.

[0008] As a further specific optimization of the technical solution of the present invention: the material vapor generated by evaporation in the single-effect external circulation solvent concentrator separator B11 is condensed by the cooler B12 and then enters the lower part of the liquid collector C13 for storage; the uncondensed gas in the system is cooled twice by the cooler B12 along with the vacuum, and the liquid flows back to the liquid collector C13; the non-condensable gas is discharged from the system along with the vacuum.

[0009] As further specific optimizations of the technical solution of the present invention: the top steam of the ultra-high-efficiency solvent distillation tower system saves refrigerant; and the single-effect external circulation solvent concentrator system heats the steam.

[0010] As a further specific optimization of the technical solution of the present invention: the single-effect external circulation solvent concentrator system performs primary distillation on the low-concentration liquid to increase the solvent concentration and remove impurities.

[0011] The multifunctional high-efficiency distillation recovery unit consists of an ultra-high-efficiency solvent distillation tower, a single-effect external circulation solvent concentrator, internal valves and pipes, and a control system. Compared with the existing technology, the advantages of the present invention are: Advantages (1): The system uses the overhead steam from the solvent distillation process as a heat source for the vacuum concentrator, improving thermal efficiency and reducing steam and cooling water losses.

[0012] Advantage (2): The ultra-high efficiency solvent distillation tower and the single-effect external circulation solvent concentrator in the system can be used in combination and can be used as two independent sets of equipment.

[0013] Advantage (3): The overall installation height of the system, system finished product concentration, thermal energy utilization, product entrainment and other indicators are better than conventional standards.

[0014] Advantage (4): The concentrator provides several heat sources such as secondary steam, saturated steam, hot water, etc., to achieve low-temperature heating and low-temperature concentration.

[0015] Advantages (5): The product is modularly assembled, and the combined product takes up little space, is easy to maintain, and is easy to operate.

[0016] Advantages (6): Individual product design can be carried out according to user needs; it can meet various functional designs such as atmospheric distillation, vacuum concentration; vacuum distillation, vacuum concentration; pressurized distillation, atmospheric concentration; pressurized distillation, vacuum concentration, etc.

[0017] Advantages (7): Products are tested and discharged online; products comply with China’s mandatory operating requirements.

[0018] Advantages (8): The system integrates solvent concentration and solvent distillation. The solvent in the material is vacuum concentrated and the solvent is distilled at normal pressure at the same time, which increases the material discharge speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the functional and efficient distillation recovery unit of the present invention. DETAILED DESCRIPTION

[0020] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0021] A multifunctional high-efficiency distillation recovery unit comprises an over-limit high-efficiency solvent distillation tower system and a single-effect external circulation solvent concentrator system.

[0022] The main function of the ultra-limited high-efficiency solvent distillation tower system is to increase the concentration of organic solvents and remove high-boiling and insoluble substances in the solvent. It operates at normal pressure. It includes: heater A1, separator A2, distillation tower A3, condenser A4, diaphragm pump C5, cooler A6, liquid collector A7, liquid collector B8, diaphragm pump B9; industrial steam is introduced into heater A1 to heat the liquid at the bottom of heater A1 and separator A2. The low-boiling point liquid enters distillation tower A3 after vaporization, and reaches the top of distillation tower A3 through the filler in distillation tower A3 (the tower body of distillation tower A3 can be stacked according to process requirements); distillation tower A3 tower The vapor generated at the top enters condenser A4 for cooling. The ethanol vapor condenses into liquid and enters liquid collector B8. It then flows through diaphragm pump C5 and refluxes to the top of distillation tower A3, where it exchanges vapor and liquid with the evaporated ethanol vapor to achieve equilibrium and maintain an appropriate ratio and concentration. The liquid at the bottom of distillation tower A3 enters liquid collector A7 and flows through diaphragm pump B9 back to the top of distillation tower A3 for secondary heating. After the ethanol vapor at the top of distillation tower A3 reaches an appropriate concentration and condenses, a portion of the liquid, if qualified, is transported out of the system as the finished product through cooler A6, while the remaining portion continues to reflux to maintain system equilibrium.

[0023] The main function of the single-effect external circulation solvent concentrator system is to perform vacuum evaporation on materials containing organic solvents under vacuum conditions, with an evaporation temperature of 40-45°C; it includes: heater B10, separator B11, cooler B12, and liquid collector C13; when used alone, separate steam is required to heat the heater B10 and separator B11; the material vapor generated by evaporation of the separator B11 is condensed by the cooler B12 and then stored in the lower part of the liquid collector C13; the uncondensed gas in the system is cooled twice by the cooler B12 along with the vacuum, and the liquid flows back to the liquid collector C13; the non-condensable gas is discharged out of the system along with the vacuum.

[0024] When the two sets of equipment are used in combination, industrial steam is introduced into the ultra-high-efficiency solvent distillation tower heater A1 to heat the liquid at the bottom of heater A1 and separator A2. The low-boiling-point liquid vaporizes and enters the distillation tower A3, passing through the packing in the tower body to reach the top of the distillation tower A3 (the distillation tower body is stacked according to process requirements). The steam from the top of the tower does not pass through the condenser A4, but directly enters the single-effect external circulation solvent concentrator heater B10 to heat the single-effect external circulation solvent concentrator. After heating, the condensed organic solvent enters liquid collector B8 and flows through diaphragm pump C5 back to the top of distillation tower A3, where it undergoes vapor-liquid exchange with the evaporated ethanol vapor to achieve equilibrium and maintain an appropriate ratio and concentration. The liquid at the bottom of distillation tower A3 enters liquid collector A7 and flows through diaphragm pump B9 back to the top of distillation tower A3 for secondary heating. After the ethanol vapor at the top of distillation tower A3 reaches an appropriate concentration and condenses, a portion of the liquid, if qualified, is transported out of the system as the finished product through cooler A6, while the remaining portion continues to reflux to maintain system equilibrium.

[0025] The material vapor generated by evaporation in the single-effect external circulation solvent concentrator separator B11 is condensed by the cooler B12 and then stored in the lower part of the liquid collector C13. The uncondensed gas in the system is cooled twice by the cooler B12 along with the vacuum, and the liquid flows back to the liquid collector C13; the non-condensable gas is discharged from the system along with the vacuum.

[0026] The overhead steam of the ultra-high-efficiency solvent distillation tower system saves refrigerant; the single-effect external circulation solvent concentrator system heats the steam.

[0027] The single-effect external circulation solvent concentrator system performs primary distillation on low-concentration liquids to increase solvent concentration and remove impurities.

[0028] The multifunctional and high-efficiency distillation recovery unit consists of an ultra-high-efficiency solvent distillation tower, a single-effect external circulation solvent concentrator, internal valves and pipes, and a control system.

[0029] Compared with the prior art, the advantages of the present invention are as follows: Advantage (1): The system uses the top steam of the solvent distillation process to provide the vacuum concentrator with heat source, thereby improving thermal efficiency and reducing steam and cooling water losses. Advantage (2): The ultra-high-efficiency solvent distillation tower and the single-effect external circulation solvent concentrator in the system can be used in combination and can be used as two independent sets of equipment. Advantage (3): The overall installation height of the system, the system finished product concentration, the thermal energy utilization rate, the product entrainment and other indicators are better than the conventional standards. Advantage (4): The concentrator provides several heat sources such as secondary steam, saturated steam, and hot water to achieve low-temperature heating and low-temperature concentration. Advantage (5): The product is modularly assembled, and the combined product occupies a small space, is easy to maintain, and is easy to operate. Advantage (6): Individual product design can be carried out according to user needs; it can meet the requirements of atmospheric distillation, vacuum concentration; vacuum distillation, vacuum concentration; pressurized distillation, atmospheric concentration; pressurized distillation, vacuum concentration and other functional designs. Advantage (7): The product is online tested and discharged; the product meets China's mandatory operating requirements. Advantages (8): The system integrates solvent concentration and solvent distillation. The solvent in the material is vacuum concentrated and the solvent is distilled at normal pressure at the same time, which increases the material discharge speed.

[0030] The above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention but is merely representative of selected embodiments of the present invention.

Claims

1. A multifunctional and efficient distillation recovery unit, characterized by: It consists of an ultra-high efficiency solvent distillation tower system and a single-effect external circulation solvent concentrator system; among which: The main function of the super-limit high-efficiency solvent distillation tower system is to increase the concentration of organic solvents, remove high-boiling and insoluble substances in the solvent, and operate at normal pressure; it includes: heater A (1), separator A (2), distillation tower A (3), condenser A (4), diaphragm pump C (5), cooler A (6), liquid collector A (7), liquid collector B (8), diaphragm pump B (9); industrial steam is introduced into heater A (1) to heat the liquid at the bottom of heater A (1) and separator A (2), and the low-boiling liquid enters distillation tower A (3) after vaporization, and reaches the top of distillation tower A (3) through the filler in distillation tower A (3); the steam generated at the top of distillation tower A (3) The vapor enters the condenser A (4) for cooling, and the ethanol vapor condenses into liquid, enters the liquid collector B (8), and flows through the diaphragm pump C (5) back to the top of the distillation tower A (3), where it exchanges vapor and liquid with the evaporated ethanol vapor to achieve equilibrium and maintain a suitable ratio concentration; the liquid at the bottom of the distillation tower A (3) enters the liquid collector A (7), and flows through the diaphragm pump B (9) back to the top of the distillation tower A (3) for secondary heating; after the ethanol vapor of suitable concentration at the top of the distillation tower A (3) is condensed, a portion of the liquid is transported to the outside of the system as a finished product after passing the cooler A (6) after testing, and the other portion of the liquid continues to reflux to maintain the balance of the system; The main function of the single-effect external circulation solvent concentrator system is to evaporate the material containing organic solvent under vacuum condition, with the evaporation temperature of 40-45°C; it includes: heater B (10), separator B (11), cooler B (12), and liquid collector C (13); when used alone, separate steam is required to heat the heater B (10) and separator B (11); the material steam generated by evaporation of separator B (11) is condensed by cooler B (12) and then stored in the lower part of liquid collector C (13); the uncondensed gas in the system is cooled twice by cooler B (12) along with the vacuum, and the liquid flows back to liquid collector C (13); the non-condensable gas is discharged out of the system along with the vacuum.

2. The multifunctional and efficient distillation recovery unit according to claim 1 is characterized in that: When the two sets of equipment are used in combination, industrial steam is introduced into the super-high-efficiency solvent distillation tower heater A(1) to heat the liquid at the bottom of the heater A(1) and the separator A(2). The low-boiling-point liquid is vaporized and enters the distillation tower A(3). It passes through the packing in the tower body and reaches the top of the distillation tower A(3) (the distillation tower body is stacked according to process requirements). The steam from the top of the tower does not pass through the condenser A(4) and directly enters the single-effect external circulation solvent concentrator heater B(10) to heat the single-effect external circulation solvent concentrator. After heating, the organic solvent condensed into liquid enters the liquid collector B (8), and is refluxed to the top of the distillation tower A (3) through the diaphragm pump C (5), where it exchanges vapor with the evaporated ethanol gas to achieve equilibrium and maintain a suitable ratio concentration; the liquid at the bottom of the distillation tower A (3) enters the liquid collector A (7), and is refluxed to the top of the distillation tower A (3) through the diaphragm pump B (9) for secondary heating; after the ethanol gas at the top of the distillation tower A (3) is condensed to a suitable concentration, a portion of the liquid is tested and transported to the outside of the system as a finished product through the cooler A (6), and the other portion of the liquid continues to reflux to maintain the balance of the system.

3. The multifunctional and efficient distillation recovery unit according to claim 1 is characterized in that: The material vapor generated by evaporation in the single-effect external circulation solvent concentrator separator B (11) is condensed by the cooler B (12) and then stored in the lower part of the liquid collector C (13). The uncondensed gas in the system is cooled twice by the cooler B (12) along with the vacuum, and the liquid flows back to the liquid collector C (13); the non-condensable gas is discharged from the system along with the vacuum.

4. The multifunctional and efficient distillation recovery unit according to claim 1 is characterized in that: The overhead steam of the ultra-high-efficiency solvent distillation tower system saves refrigerant; the single-effect external circulation solvent concentrator system heats the steam.

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