Pressure regulating device for purifying polyolefin catalyst synthetic solvent

Abstract

The utility model relates to the field of polyolefin catalyst synthesis solvent purification, in particular to a pressure regulating device for polyolefin catalyst synthesis solvent purification. The technical problems that in the distillation process of an existing purification device, the phenomenon of unbalanced pressure frequently exists between a condensation heat exchanger and a receiving tank, so that condensed liquid cannot be smoothly transferred to the receiving tank, cooling liquid is accumulated in a condenser, hexane is discontinuous in the distillation and purification process, and the yield of hexane is increased are solved. The distillation efficiency of the hexane is reduced. According to the technical scheme, the pressure regulating device for purifying the polyolefin catalyst synthetic solvent comprises a condensing heat exchanger, a receiving tank and a liquid discharging pipe, according to the device, the purification process is maintained, and corresponding control measures are taken, so that the phenomenon that the condensed liquid cannot be smoothly transferred to the receiving tank due to the unbalanced pressure is avoided, the accumulation of the cooling liquid in the condenser is reduced, the hexane is continuously purified in the distillation and purification process, and the distillation efficiency of the hexane is improved.

Description

Technical Field

[0001] The utility model relates to the field of polyolefin catalyst synthesis solvent purification, in particular to a pressure regulating device for polyolefin catalyst synthesis solvent purification. Background Art

[0002] The polyolefin catalyst synthesis solvent is a solvent used in the polyolefin catalyst synthesis process. During the recovery and purification of the polyolefin catalyst synthesis solvent, the boiling point of hexane is relatively low, and the hexane is generally purified by normal pressure or pressurized distillation. In the existing purification device, during the distillation process, there is often a pressure imbalance between the condensing heat exchanger and the receiving tank, resulting in the condensed liquid being unable to be smoothly transferred to the receiving tank, thereby causing the cooling liquid to accumulate in the condenser, making the hexane discontinuous during the distillation and purification process, thereby reducing the distillation efficiency of the hexane; therefore, we propose a pressure regulating device for purifying the polyolefin catalyst synthesis solvent to solve the above-mentioned problems. Utility Model Content

[0003] In order to overcome the problem in the existing purification device, during the distillation process, there is often a pressure imbalance between the condensing heat exchanger and the receiving tank, which causes the condensed liquid to be unable to be smoothly transferred to the receiving tank, thereby causing the cooling liquid to accumulate in the condenser, making the hexane discontinuous during the distillation and purification process, thereby reducing the distillation efficiency of the hexane.

[0004] The technical solution of the utility model is: a pressure regulating device for purifying a polyolefin catalyst synthesis solvent, comprising a condensing heat exchanger, a receiving tank and a downpipe; a receiving tank for collecting purified solvent for subsequent storage or use is installed below the condensing heat exchanger, and a downpipe for transmitting the condensed liquid in the condensing heat exchanger to the receiving tank is installed between the receiving tank and the condensing heat exchanger.

[0005] Preferably, by installing a heat exchanger gas pressure sensor at the outer end of the condensing heat exchanger, the gas pressure sensor can monitor the gas pressure changes in the condensing heat exchanger in real time, maintain the purification process, and take corresponding control measures to avoid pressure imbalance, which causes the condensed liquid to be unable to be smoothly transferred to the receiving tank, reduces the accumulation of cooling liquid inside the condenser, and enables hexane to be continuously purified during the distillation and purification process, thereby improving the distillation efficiency of hexane. By installing a heat exchanger nitrogen gas pressure automatic regulating valve at the outer end of the heat exchange nitrogen pipe, nitrogen, as a heat exchange medium, plays a key role in heat exchange, and realizes automatic adjustment of the nitrogen pressure in the heat exchange, maintains stable operating conditions, and avoids adverse effects on the purification process due to pressure fluctuations. At the same time, a receiving tank nitrogen pipe pressure automatic regulating valve is installed at the outer end of the receiving tank to ensure that the pressure in the receiving tank is maintained within a stable range, to prevent the pressure in the tank from being too high, resulting in excessive evaporation of the solvent and unnecessary losses.

[0006] Preferably, a heat exchanger gas pressure sensor is provided at the upper end of the condensing heat exchanger, and the heat exchanger gas pressure sensor extends through the condensing heat exchanger to the interior. By installing the heat exchanger gas pressure sensor at the outer end of the condensing heat exchanger, the gas pressure sensor can monitor the gas pressure changes in the condensing heat exchanger in real time, maintain the purification process, and take corresponding control measures to improve the purification efficiency and product quality.

[0007] Preferably, a heat exchanger nitrogen pipe is provided at the upper end of the condensing heat exchanger, located outside the heat exchanger gas pressure sensor, and a heat exchanger nitrogen gas pressure automatic regulating valve is provided at the outer end of the heat exchanger nitrogen pipe. By installing the heat exchanger nitrogen gas pressure automatic regulating valve at the outer end of the heat exchange nitrogen pipe, nitrogen, as a heat exchange medium, plays a key role in the heat exchange, thereby realizing automatic adjustment of the nitrogen pressure in the heat exchange, maintaining stable operating conditions, and avoiding adverse effects on the purification process due to pressure fluctuations.

[0008] Preferably, a receiving tank nitrogen pipe is provided at the upper end of the receiving tank, and an automatic pressure regulating valve for the receiving tank nitrogen pipe is provided at the outer end of the receiving tank nitrogen pipe. The receiving tank nitrogen pipe extends through the receiving tank to the interior. By installing the automatic pressure regulating valve for the receiving tank nitrogen pipe at the outer end of the receiving tank, the pressure in the receiving tank is ensured to be maintained within a stable range, thereby avoiding affecting the quality and purification effect of the solvent due to excessively high or low pressure, and preventing the pressure in the tank from being too high, causing the solvent to evaporate too quickly and causing unnecessary losses.

[0009] Preferably, a receiving tank pressure sensor is provided at the outer end of the receiving tank, and one end of the receiving tank pressure sensor extends through the receiving tank to the inside to avoid pressure imbalance, which causes the condensed liquid to be unable to be smoothly transferred to the receiving tank, thereby reducing the accumulation of cooling liquid inside the condenser, allowing the hexane to be continuously purified during the distillation and purification process, thereby improving the distillation efficiency of the hexane.

[0010] Preferably, both ends of the downpipe are provided with connecting sealing sleeves, and the condensing heat exchanger is connected to the receiving tank through the downpipe.

[0011] Preferably, a load-bearing ring is provided at the bottom of the receiving tank, and multiple groups of support rods are provided between the load-bearing ring and the receiving tank. The multiple support rods are arranged around the upper end of the load-bearing ring. The load-bearing ring is installed at the bottom of the collecting tank to connect the support rods, which provides a stable support, reduces the deformation or displacement of the collecting tank caused by pressure or temperature changes, ensures the stability of the collecting tank during the purification process, and avoids safety accidents caused by shaking or tipping over of the collecting tank during the purification process, thereby improving the safety of the entire device.

[0012] Beneficial effects of the utility model:

[0013] 1. Compared with the traditional purification device, by installing a heat exchanger gas pressure sensor at the outer end of the condensing heat exchanger, the gas pressure sensor can monitor the gas pressure changes in the condensing heat exchanger in real time, maintain the purification process, and take corresponding control measures to avoid pressure imbalance, which causes the condensed liquid to be unable to be smoothly transferred to the receiving tank, reduce the accumulation of cooling liquid inside the condenser, and enable hexane to be continuously purified during the distillation purification process, thereby improving the distillation efficiency of hexane.

[0014] 2. By installing a heat exchanger nitrogen gas pressure automatic regulating valve at the outer end of the hot ventilation nitrogen pipe, nitrogen, as a heat exchange medium, plays a key role in hot ventilation, realizing automatic regulation of nitrogen pressure in hot ventilation, maintaining stable operating conditions, and avoiding adverse effects on the purification process due to pressure fluctuations. At the same time, an automatic pressure regulating valve for the nitrogen pipe of the receiving tank is installed at the outer end of the receiving tank to ensure that the pressure in the receiving tank is maintained within a stable range, preventing the pressure in the tank from being too high, causing the solvent to evaporate too quickly, and causing unnecessary losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the heat exchanger gas pressure sensor of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the condensing heat exchanger of the utility model;

[0018] Figure 4 This is a schematic diagram of the internal structure of the receiving tank of the present utility model.

[0019] Explanation of the reference numerals: 1. Condensing heat exchanger; 2. Receiving tank; 3. Heat exchanger gas pressure sensor; 4. Receiving tank pressure sensor; 5. Heat exchanger nitrogen pipe; 6. Receiving tank nitrogen pipe; 7. Heat exchanger nitrogen gas pressure automatic regulating valve; 8. Receiving tank nitrogen pipe pressure automatic regulating valve; 9. Downpipe; 10. Load-bearing ring; 11. Support rod. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] See also Figure 1-4 The utility model provides an embodiment: a pressure regulating device for purifying a polyolefin catalyst synthesis solvent, comprising a condensing heat exchanger 1, a receiving tank 2 and a downpipe 9; a receiving tank 2 for collecting the purified solvent for subsequent storage or use is installed below the condensing heat exchanger 1, and a downpipe 9 for transferring the condensed liquid in the condensing heat exchanger 1 to the receiving tank 2 is installed between the receiving tank 2 and the condensing heat exchanger 1.

[0022] See also Figure 1-2 In this embodiment, a heat exchanger gas pressure sensor 3 is provided at the upper end of the condensing heat exchanger 1, and the heat exchanger gas pressure sensor 3 extends through the condensing heat exchanger 1 to the inside. By installing the heat exchanger gas pressure sensor 3 at the outer end of the condensing heat exchanger 1, the gas pressure sensor can monitor the gas pressure changes in the condensing heat exchanger 1 in real time, maintain the purification process, and take corresponding control measures to improve the purification efficiency and product quality. A heat exchanger nitrogen pipe 5 is provided at the upper end of the condensing heat exchanger 1, located outside the heat exchanger gas pressure sensor 3, and a heat exchanger nitrogen gas pressure automatic regulating valve 7 is provided at the outer end of the heat exchanger nitrogen pipe 5. By installing the heat exchanger nitrogen gas pressure automatic regulating valve 7 at the outer end of the heat exchange nitrogen pipe, nitrogen, as a heat exchange medium, plays a key role in heat exchange, realizes automatic adjustment of the nitrogen pressure in heat exchange, maintains stable operating conditions, and avoids adverse effects on the purification process due to pressure fluctuations.

[0023] See also Figure 1-3 In this embodiment, a receiving tank nitrogen pipe 6 is provided at the upper end of the receiving tank 2, and a receiving tank nitrogen pipe pressure automatic regulating valve 8 is provided at the outer end of the receiving tank 2. The receiving tank nitrogen pipe 6 passes through the receiving tank 2 and extends to the inside. By installing the receiving tank nitrogen pipe pressure automatic regulating valve 8 at the outer end of the receiving tank 2, it is ensured that the pressure in the receiving tank 2 is maintained within a stable range to avoid affecting the quality and purification effect of the solvent due to excessively high or low pressure, and to prevent the pressure in the tank from being too high, causing the solvent to evaporate too quickly and causing unnecessary losses. A receiving tank pressure sensor 4 is provided at the outer end of the receiving tank 2, and one end of the receiving tank pressure sensor 4 passes through the receiving tank 2 and extends to the inside to avoid pressure imbalance, resulting in the condensed liquid being unable to be smoothly transferred to the receiving tank 2, reducing the accumulation of cooling liquid inside the condenser, so that hexane can be continuously purified during the distillation and purification process, thereby improving the distillation efficiency of hexane.

[0024] See also Figure 2-4 In this embodiment, connecting sealing sleeves are provided at both ends of the downpipe 9, and the condensing heat exchanger 1 is connected to the receiving tank 2 through the downpipe 9. A load-bearing ring 10 is provided below the receiving tank 2, and multiple groups of support rods 11 are provided between the load-bearing ring 10 and the receiving tank 2. Multiple support rods 11 are arranged around the upper end of the load-bearing ring 10. The load-bearing ring 10 is installed at the bottom of the collecting tank to connect the support rods 11, which provides a stable support, reduces the deformation or displacement of the collecting tank caused by pressure or temperature changes, ensures the stability of the collecting tank during the purification process, and avoids safety accidents caused by shaking or tipping of the collecting tank during the purification process, thereby improving the safety of the entire device. The model of the heat exchanger gas pressure sensor 3 and the receiving tank pressure sensor 4 is XGZP6847A, and the model of the heat exchanger nitrogen gas pressure automatic regulating valve 7 and the receiving tank nitrogen pipe pressure automatic regulating valve 8 is ZBY.

[0025] When working, firstly, a heat exchanger gas pressure sensor 3 is installed on the upper part of the condensing heat exchanger 1 to detect the pressure inside the heat exchanger; a receiving tank pressure sensor 4 is installed on the upper part of the receiving tank 2 to detect the pressure inside the receiving tank 2; the heat exchanger nitrogen pipe 5 and the receiving tank nitrogen pipe 6 are connected above the heat exchanger and the receiving tank 2 respectively; the outer ends of the heat exchanger nitrogen pipe 5 and the receiving tank nitrogen pipe 6 are installed with a heat exchanger nitrogen gas pressure automatic regulating valve 7 and a receiving tank nitrogen pipe pressure automatic regulating valve 8; the pressure sensors and the nitrogen gas pressure automatic regulating valve of the heat exchanger and the receiving tank 2 are respectively connected to the DCS control system, and interlocking control is realized. When the pressure of the heat exchanger and the receiving tank 2 is unbalanced, the gas pressure automatic regulating valve is opened, and the heat exchanger or the receiving tank 2 is filled with nitrogen to achieve a balance between the two and always maintain the balance. The pressure in the heat exchanger is always 5KPa to 10KPa greater than the pressure of the receiving tank 2, so that the cooling liquid in the heat exchanger can flow smoothly into the receiving tank. Through automatic pressure adjustment, the efficiency of distillation is accelerated, and the pressure between the heat exchanger and the receiving tank 2 can be controlled. The specific pressure values ​​of the heat exchanger gas pressure sensor 3 and the receiving tank pressure sensor 4 are detected by DCS interlocking. When the pressure value of the heat exchanger gas pressure sensor 3 is 5KPa lower than the pressure value of the receiving tank pressure sensor 4, the heat exchanger nitrogen gas pressure automatic regulating valve 7 automatically opens to supplement nitrogen, so that the heat exchanger gas pressure sensor 3 is higher than the 5KPa to 10KPa of the receiving tank pressure sensor 4; thereby, the pressure of the heat exchanger is always greater than the pressure of the receiving tank 2, so that the hexane liquid can flow smoothly from the downcomer pipe 9 into the receiving tank 2.

[0026] Through the above steps, by installing a heat exchanger gas pressure sensor 3 at the outer end of the condensing heat exchanger 1, the gas pressure sensor can monitor the gas pressure changes in the condensing heat exchanger 1 in real time, maintain the purification process, and take corresponding control measures to avoid pressure imbalance, resulting in the condensed liquid being unable to be smoothly transferred to the receiving tank 2, reducing the accumulation of cooling liquid inside the condenser, so that hexane can be continuously purified during the distillation and purification process, thereby improving the distillation efficiency of hexane. By installing a heat exchanger nitrogen gas pressure automatic regulating valve 7 at the outer end of the heat exchange nitrogen pipe, nitrogen, as a heat exchange medium, plays a key role in heat exchange, and realizes automatic regulation of nitrogen pressure in heat exchange, maintains stable operating conditions, and avoids adverse effects on the purification process due to pressure fluctuations. At the same time, a receiving tank nitrogen pipe pressure automatic regulating valve 8 is installed at the outer end of the receiving tank 2 to ensure that the pressure in the receiving tank 2 is maintained within a stable range, preventing the pressure in the tank from being too high, resulting in excessive evaporation of the solvent and causing unnecessary losses.

[0027] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A pressure regulating device for purifying a polyolefin catalyst synthesis solvent, comprising a condensing heat exchanger (1); characterized in that: It also includes a receiving tank (2) and a downpipe (9); a receiving tank (2) for collecting purified solvent for subsequent storage or use is installed below the condensing heat exchanger (1); a downpipe (9) for transferring the condensed liquid in the condensing heat exchanger (1) to the receiving tank (2) is installed between the receiving tank (2) and the condensing heat exchanger (1).

2. The pressure regulating device for purifying a polyolefin catalyst synthesis solvent according to claim 1, characterized in that: A heat exchanger gas pressure sensor (3) is provided at the upper end of the condensing heat exchanger (1), and the heat exchanger gas pressure sensor (3) passes through the condensing heat exchanger (1) and extends to the interior.

3. The pressure regulating device for purifying a polyolefin catalyst synthesis solvent according to claim 2, characterized in that: A heat exchanger nitrogen pipe (5) is provided at the upper end of the condensing heat exchanger (1) and located outside the heat exchanger gas pressure sensor (3), and a heat exchanger nitrogen gas pressure automatic regulating valve (7) is provided at the outer end of the heat exchanger nitrogen pipe (5).

4. The pressure regulating device for purifying a polyolefin catalyst synthesis solvent according to claim 1, characterized in that: A receiving tank nitrogen pipe (6) is provided at the upper end of the receiving tank (2), a receiving tank nitrogen pipe pressure automatic regulating valve (8) is provided at the outer end of the receiving tank nitrogen pipe (6), and the receiving tank nitrogen pipe (6) passes through the receiving tank (2) and extends to the interior.

5. The pressure regulating device for purifying a polyolefin catalyst synthesis solvent according to claim 4, characterized in that: A receiving tank pressure sensor (4) is provided at the outer end of the receiving tank (2), and one end of the receiving tank pressure sensor (4) passes through the receiving tank (2) and extends to the interior.

6. The pressure regulating device for purifying a polyolefin catalyst synthesis solvent according to claim 1, characterized in that: Both ends of the downpipe (9) are provided with connecting sealing sleeves, and the condensing heat exchanger (1) is connected to the receiving tank (2) via the downpipe.

7. The pressure regulating device for purifying a polyolefin catalyst synthesis solvent according to claim 4, characterized in that: A load-bearing ring (10) is provided below the receiving tank (2), and a plurality of groups of support rods (11) are provided between the load-bearing ring (10) and the receiving tank (2). The plurality of support rods (11) are arranged around the upper end of the load-bearing ring (10).

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