Variable pressure rectification device for separating tetrahydrofuran and water

Abstract

The utility model relates to the technical field of rectification, in particular to a variable-pressure rectification device for separating tetrahydrofuran and water, which comprises a variable-pressure rectification tank, and a circulating heating device for heating water and tetrahydrofuran is arranged on one side of the variable-pressure rectification tank. A condensation assembly used for condensing tetrahydrofuran steam into liquid is further arranged on the variable-pressure rectification tank, the condensation assembly comprises a condenser used for condensing the tetrahydrofuran steam, two flow dividing plates are arranged in the condenser, a flow dividing pipe is further arranged between the two flow dividing plates, the condensation assembly further comprises two radiators, and the two radiators are arranged in the condenser. According to the utility model, the multi-layer circular radiating pipe is formed by crisscrossed multiple pipelines, so that the radiating area is increased, and meanwhile, the occupied space is effectively reduced. In addition, the radiator is further provided with two radiating fans which are oppositely arranged. When the two heat dissipation fans blow air oppositely, the air can be evenly diffused all around, heat on the heat dissipation pipes is effectively taken away, and therefore the effect of rapid heat dissipation is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to rectification technical field, concretely is a kind of pressure swing rectification device of separating tetrahydrofuran and water. BACKGROUND

[0002] Tetrahydrofuran as a kind of organic compound, can be mixed with a variety of organic solvents such as water, alcohol, ketone, benzene, ester, ether and hydrocarbon. In air, tetrahydrofuran can form explosive peroxide, flammable when encountering open fire, high temperature or oxidizing agent. Under normal pressure, the boiling point of tetrahydrofuran is 66 DEG C, lower than the boiling point of water (100 DEG C). Therefore, in the rectification process, temperature needs to be controlled to avoid being too high. The existing rectification equipment evaporates tetrahydrofuran, and liquefies its steam by using condensing device, although it can realize the separation of tetrahydrofuran and water to some extent, but the condensing effect is not ideal, thereby limiting the separation efficiency and purity.

[0003] Chinese patent CN213790038U discloses a kind of methyl acetate and methanol pressure swing rectification device, its technical scheme involves the combination of distillation kettle and rectification tower. First condenser is arranged between distillation kettle and rectification tower, liquid inlet is equipped on the side of distillation kettle, heating coil is installed inside, and waste residue port is arranged on the bottom surface. The middle of the side of rectification tower is provided with inlet, a plurality of staggered distribution trays are arranged inside, and packing layer is laid on the tray. The side wall near the upper end surface of rectification tower is provided with reflux port, the side wall near the lower end surface is provided with gas inlet, the upper end surface is provided with gas outlet, and the lower end surface is provided with liquid outlet. Steam pipe is connected between liquid outlet and the lowest tray, reboiler is arranged between gas inlet and liquid outlet (located outside rectification tower), and second condenser is arranged between gas outlet and reflux port (also located outside rectification tower). The technical scheme evaporates liquid material to gaseous state, and then gaseous material enters condenser from the top of rectification tower, and is converted into liquid material by condenser.

[0004] However, the prior art introduces cooling water into the condenser, and the heat is taken away by the flow of water, and these heat needs to be dissipated by heat dissipation device. The heat dissipation device usually adopts the combination of serpentine pipe and fin, but the combination cost is higher. In order to improve the heat dissipation effect, the size of heat dissipation device is also increased. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing pressure swing rectification device of separating tetrahydrofuran and water, adopts multiple pipeline vertical and horizontal interlaced and is made into multilayer circular heat dissipation pipe, and then the heat dissipation area is increased, and space occupation is effectively reduced. In addition, the radiator is also provided with two oppositely arranged heat dissipation fans. When the two heat dissipation fans blow relatively, the wind will spread evenly around, effectively taking away the heat on the heat dissipation pipe, so as to realize the effect of rapid heat dissipation.

[0006] In order to solve the prior art problems, the utility model provides a kind of variable pressure rectification device of separating tetrahydrofuran and water, including variable pressure rectification jar, the one side of variable pressure rectification jar is provided with the circulating heating device for heating water and tetrahydrofuran, still be provided with the condensing assembly for condensing into liquid state to tetrahydrofuran steam on variable pressure rectification jar, the condensing assembly includes the condenser for condensing tetrahydrofuran steam, two shunt plates are provided in the condenser, shunt pipe is also provided between two shunt plates, the condensing assembly also includes two radiators, shunt pipe for heat conducting agent heat dissipation is provided between two radiators, and the radiator is provided on two shunt plates.

[0007] Preferably, the shunt pipe is coiled into a cylindrical structure by a plurality of pipe, and the two heat dissipation fans are symmetrically arranged at the upper and lower ends of the cylindrical structure.

[0008] Preferably, a plurality of protrusions for heat conduction are arranged on each shunt pipe along the length direction thereof.

[0009] Preferably, the condensing assembly includes a fifth connecting pipe, one end of the fifth connecting pipe penetrates the top end of the condenser and is connected with the upper shunt plate, the other end of the fifth connecting pipe is connected with the top end of the variable pressure rectification jar, a discharge pipe is connected to the lower shunt plate, the discharge pipe penetrates the condenser and extends to the outside of the condenser.

[0010] Preferably, the condensing assembly includes a storage tank for storing heat conducting agent, a second circulating pump is fixed to the top of the storage tank, the liquid inlet end of the second circulating pump is connected with the storage tank through a pipe, the liquid outlet end of the second circulating pump is connected with a fourth connecting pipe, one end of the fourth connecting pipe is connected with the bottom of one side of the condenser, a sixth connecting pipe is connected to the condenser, one end of the sixth connecting pipe is connected to the top radiator, the bottom of the radiator is connected with a seventh connecting pipe, and one end of the seventh connecting pipe is connected to the storage tank.

[0011] Preferably, the circulating heating device includes a heating tank, and a heater for heating tetrahydrofuran and water is arranged in the heating tank.

[0012] Preferably, the circulating heating device includes a first circulating pump, the liquid inlet end of the first circulating pump is connected with a first connecting pipe, one end of the first connecting pipe is connected to the bottom of the variable pressure rectification jar, the liquid outlet end of the first circulating pump is connected with the heating tank through a pipe, a second connecting pipe is connected to the heating tank, one end of the second connecting pipe extends into the variable pressure rectification jar and is connected with a third connecting pipe, and a plurality of nozzles are arranged on the third connecting pipe.

[0013] Preferably, a temperature sensor for detecting the temperature of tetrahydrofuran and water in the variable pressure rectification jar is fixed to the bottom of the variable pressure rectification jar.

[0014] The utility model discloses beneficial effect compared with prior art is:

[0015] 1. The present application is provided with condensing assembly, and the condensing assembly not only realizes excellent condensing effect, but also can realize the recycling of heat transfer agent, and the heat dissipation speed of heat transfer agent is improved significantly. Specifically, the condensing assembly is made of multiple layers of circular heat dissipation pipes in a crisscross manner, which effectively increases the heat dissipation area while maintaining a small space occupation. In addition, the radiator is also equipped with two oppositely arranged cooling fans. When the two cooling fans blow, the wind will spread evenly in all directions, effectively taking away the heat on the heat dissipation pipes, thereby achieving rapid heat dissipation.

[0016] 2. The present application also provides a plurality of shunt pipes, and a plurality of protrusions are designed on the shunt pipes to increase the contact area between the shunt pipes and the heat transfer agent. This design can accelerate the liquefaction process of tetrahydrofuran vapor and improve the rectification efficiency.

[0017] 3. The present application draws the original liquid in the pressure swing rectification tank into the heating tank through the action of the first circulating pump. Inside the heating tank, the heater heats the original liquid. Then, the heated original liquid is sprayed through the nozzle, which makes tetrahydrofuran evaporate quickly from water, thereby realizing rapid rectification. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a first three-dimensional structure schematic diagram of a pressure swing rectification device for separating tetrahydrofuran and water.

[0019] Figure 2 It is a second three-dimensional structure schematic diagram of a pressure swing rectification device for separating tetrahydrofuran and water.

[0020] Figure 3 It is a first three-dimensional structure schematic diagram of a condensing assembly of a pressure swing rectification device for separating tetrahydrofuran and water.

[0021] Figure 4 It is a second three-dimensional structure schematic diagram of a condensing assembly of a pressure swing rectification device for separating tetrahydrofuran and water.

[0022] Figure 5 It is a structure schematic diagram of a circulating heating device of a pressure swing rectification device for separating tetrahydrofuran and water.

[0023] Figure 6 It is a cross-sectional structure schematic diagram of a circulating heating device of a pressure swing rectification device for separating tetrahydrofuran and water.

[0024] The figure marks are: 1, variable pressure rectification tank; 11, circulating heating device; 111, heating tank; 112, first connecting pipe; 113, first circulating pump; 114, second connecting pipe; 115, heater; 116, third connecting pipe; 117, spray head; 12, condensing assembly; 121, storage tank; 122, second circulating pump; 123, fourth connecting pipe; 124, condenser; 1241, fifth connecting pipe; 1242, discharge pipe; 1243, sixth connecting pipe; 125, radiator; 1251, radiating pipe; 1252, seventh connecting pipe; 1253, radiating fan; 126, flow dividing disc; 1261, flow dividing pipe; 2, temperature sensor. DETAILED DESCRIPTION

[0025] In order to further understand the features, technical means and specific purposes and functions achieved by the utility model, the utility model will be described in further detail below in combination with the drawings and specific embodiments.

[0026] Referring to Figures 1-6 The utility model provides: a variable pressure rectification device of tetrahydrofuran and water, including variable pressure rectification tank 1, variable pressure rectification tank 1 is the core component of whole device, for containing the mixture of tetrahydrofuran and water to be separated, and carries out rectification under the condition of specific pressure and temperature. Variable pressure rectification tank 1 one side is provided with the circulating heating device 11 for heating water and tetrahydrofuran, variable pressure rectification tank 1 still is provided with the condensing assembly 12 for condensing tetrahydrofuran steam into liquid state, and the condensing assembly 12 includes the condenser 124 for condensing tetrahydrofuran steam, is provided with two flow dividing discs 126 in the condenser 124, still is provided with flow dividing pipe 1261 between two flow dividing discs 126, and the design of flow dividing disc 126 and flow dividing pipe 1261 helps the uniform distribution of steam in the condenser 124, improves condensing efficiency. The condensing assembly 12 still includes two radiators 125, is provided with radiating pipe 1251 for the heat dissipation of heat conducting agent between two radiators 125, and is provided with radiating fan 1253 on two radiators 125. Radiating pipe 1251 is coiled into cylindrical structure through multiple pipes, and two radiating fans 1253 are arranged at the upper and lower ends of the cylindrical structure respectively. The mixture is heated by circulating heating device 11, makes tetrahydrofuran reach boiling point and evaporate, then utilizes the condensing assembly 12 and condenses steam into liquid state, finally through radiator 125, the heat generated in the condensation process is dissipated.

[0027] The condensing assembly 12 adopts the radiating pipe 1251 that multiple pipes are coiled into cylindrical structure, which effectively increases the heat dissipation area while maintaining a small space occupation. In addition, the radiator 125 is also equipped with two oppositely arranged radiating fans 1253. When the two radiating fans 1253 blow relatively, the wind will spread evenly to all directions, effectively taking away the heat on the radiating pipe 1251, thereby achieving rapid heat dissipation.

[0028] Each shunt pipe 1261 is provided with a plurality of protrusions along its length direction for heat conduction. The contact area between the shunt pipe 1261 and the heat conducting agent is increased. This design can accelerate the liquefaction process of tetrahydrofuran vapor and improve the efficiency of rectification. The condensing assembly 12 comprises a fifth connecting pipe 1241, one end of the fifth connecting pipe 1241 penetrates through the top end of the condenser 124 and is connected with the upper shunt disc 126, the other end of the fifth connecting pipe 1241 is connected with the top end of the pressure swing rectification tank 1, the lower shunt disc 126 is connected with a discharge pipe 1242, the discharge pipe 1242 is used to discharge the condensed tetrahydrofuran liquid from the condenser 124. It is convenient to collect and utilize the condensed tetrahydrofuran liquid. The discharge pipe 1242 penetrates through the condenser 124 and extends to the outside of the condenser 124.

[0029] The condensing assembly 12 comprises a storage tank 121 for storing the heat conducting agent, the top of the storage tank 121 is fixedly connected with a second circulating pump 122, the liquid inlet end of the second circulating pump 122 extends to the storage tank 121 through a pipeline, the second circulating pump 122 is a key equipment for driving the circulation of the heat conducting agent, which ensures that the heat conducting agent can be effectively pumped out and delivered to the condenser 124. The liquid outlet end of the second circulating pump 122 is connected with a fourth connecting pipe 123, one end of the fourth connecting pipe 123 is connected with the bottom of one side of the condenser 124, the condenser 124 is connected with a sixth connecting pipe 1243, one end of the sixth connecting pipe 1243 is connected with the top of a radiator 125, the bottom of the radiator 125 is connected with a seventh connecting pipe 1252, one end of the seventh connecting pipe 1252 is connected with the storage tank 121.

[0030] The circulating heating device 11 comprises a heating tank 111, and a heater 115 is arranged in the heating tank 111 for heating tetrahydrofuran and water.

[0031] The circulating heating device 11 comprises a first circulating pump 113, the liquid inlet end of the first circulating pump 113 is connected with a first connecting pipe 112, one end of the first connecting pipe 112 is connected with the bottom of the pressure swing rectification tank 1, the liquid outlet end of the first circulating pump 113 is connected with the heating tank 111 through a pipeline, the heating tank 111 is connected with a second connecting pipe 114, one end of the second connecting pipe 114 extends to the pressure swing rectification tank 1 and is connected with a third connecting pipe 116, and a plurality of nozzles 117 are arranged on the third connecting pipe 116.

[0032] The raw liquid in the pressure swing rectification tank 1 is pumped into the heating tank 111. In the heating tank 111, the heater 115 heats the raw liquid. Then, the heated raw liquid is sprayed and atomized through the nozzles 117. This step makes tetrahydrofuran evaporate quickly from water, so that the rectification is quickly carried out.

[0033] The temperature sensor 2 for detecting the temperature of tetrahydrofuran and water in the variable pressure rectification tank 1 is fixed at the bottom of the variable pressure rectification tank 1.

[0034] Working principle: in use, first, the raw liquid is introduced into the variable pressure rectification tank 1. Then, the first circulating pump 113 is started, and the first circulating pump 113 pumps the raw liquid in the variable pressure rectification tank 1 into the heating tank 111. The heater 115 in the heating tank 111 heats the raw liquid. The heated raw liquid is sprayed into the variable pressure rectification tank 1 through the spray head 117, which promotes the rapid evaporation of tetrahydrofuran from water. The evaporated tetrahydrofuran then enters the shunt pipe 1261 through the fifth connecting pipe 1241. At this time, the second circulating pump 122 is started, and the second circulating pump 122 pumps the heat conducting agent in the storage tank 121 into the condenser 124. In the condenser 124, the heat conducting agent exchanges heat with the tetrahydrofuran vapor in the shunt pipe 1261, so that the tetrahydrofuran vapor is liquefied. The liquefied tetrahydrofuran is discharged from the discharge pipe 1242 and collected. After the heat exchange is completed, the heat conducting agent flows into the heat dissipation pipe 1251 from the sixth connecting pipe 1243. The heat dissipation pipe 1251 is coiled into a cylindrical structure through multiple pipes to increase the heat dissipation area while maintaining a small overall size. In addition, two opposite blowing heat dissipation fans 1253 are arranged on both sides of the heat dissipation pipe 1251. When the heat dissipation fan 1253 works, the wind will spread around, effectively taking away the heat on the heat dissipation pipe 1251, achieving rapid heat dissipation. Finally, the heat dissipated heat conducting agent flows back into the storage tank 121 for recycling.

[0035] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A pressure swing distillation apparatus for separating tetrahydrofuran and water, characterized by: The application relates to a variable pressure rectification tank (1) provided with a circulating heating device (11) for heating water and tetrahydrofuran on one side of the variable pressure rectification tank (1), and a condensing assembly (12) for condensing tetrahydrofuran steam into liquid state on the variable pressure rectification tank (1), wherein the condensing assembly (12) comprises a condenser (124) for condensing tetrahydrofuran steam, two flow distribution discs (126) are arranged in the condenser (124), and a flow distribution pipe (1261) is arranged between the two flow distribution discs (126); and the condensing assembly (12) further comprises two radiators (125) provided with a heat dissipation pipe (1251) for dissipating heat of a heat conducting agent, and a heat dissipation fan (1253) is arranged on each of the two radiators (125).

2. The apparatus for separating tetrahydrofuran and water by pressure swing distillation according to claim 1, wherein: The heat dissipation pipe (1251) is coiled into a cylindrical structure through a plurality of pipe coils, and the two heat dissipation fans (1253) are arranged at the upper and lower ends of the cylindrical structure.

3. The apparatus for separating tetrahydrofuran and water by pressure swing distillation according to claim 1, wherein: Each flow distribution pipe (1261) is provided with a plurality of protrusions for heat conduction along the length direction of the flow distribution pipe (1261).

4. The apparatus for separating tetrahydrofuran and water by pressure swing distillation according to claim 1, wherein: The condensing assembly (12) comprises a fifth connecting pipe (1241), one end of the fifth connecting pipe (1241) penetrates through the top end of the condenser (124) and is connected with the upper flow distribution disc (126), and the other end of the fifth connecting pipe (1241) is connected with the top end of the variable pressure rectification tank (1); a discharge pipe (1242) is connected to the lower flow distribution disc (126), the discharge pipe (1242) penetrates through the condenser (124) and extends to the outside of the condenser (124).

5. A pressure swing distillation apparatus for separating tetrahydrofuran and water according to claim 4, characterized in that: The condensing assembly (12) further comprises a storage tank (121) for storing the heat conducting agent, a second circulating pump (122) is fixed to the top of the storage tank (121), the liquid inlet end of the second circulating pump (122) is connected with the storage tank (121) through a pipe, the liquid outlet end of the second circulating pump (122) is connected with a fourth connecting pipe (123), one end of the fourth connecting pipe (123) is connected with the condenser (124), a sixth connecting pipe (1243) is connected to the condenser (124), one end of the sixth connecting pipe (1243) is connected with the top radiator (125), a seventh connecting pipe (1252) is connected to the bottom of the radiator (125), and one end of the seventh connecting pipe (1252) is connected with the storage tank (121).

6. The apparatus for separating tetrahydrofuran and water by pressure swing distillation according to claim 1, wherein: The circulating heating device (11) comprises a heating tank (111), and a heater (115) for heating tetrahydrofuran and water is arranged in the heating tank (111).

7. A pressure swing distillation apparatus for separating tetrahydrofuran and water according to claim 6, characterized in that: The circulating heating device (11) further comprises a first circulating pump (113), a first connecting pipe (112) is connected to the liquid inlet end of the first circulating pump (113), one end of the first connecting pipe (112) is connected to the bottom of the variable pressure rectifying tank (1), the liquid outlet end of the first circulating pump (113) is connected to the heating tank (111) through a pipeline, a second connecting pipe (114) is connected to the heating tank (111), one end of the second connecting pipe (114) extends into the variable pressure rectifying tank (1) and is connected with a third connecting pipe (116), and a plurality of spray heads (117) are arranged on the third connecting pipe (116).

8. The apparatus for separating tetrahydrofuran and water by pressure swing distillation according to claim 1, wherein: A temperature sensor (2) for detecting the temperature of tetrahydrofuran and water in the variable pressure rectifying tank (1) is fixed to the bottom of the variable pressure rectifying tank (1).

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