A styrene purification device

Abstract

The utility model relates to a kind of styrene purification device, including raw material storage tank and material receiving tank, primary adsorption tower, secondary adsorption tower and nitrogen cylinder, raw material storage tank is connected to the feed inlet of primary adsorption tower by feed pump;The first port of first three-way valve is connected to the first discharge pipeline of primary adsorption tower, and the second port and third port of first three-way valve are connected to the feed inlet and primary material receiving pipeline of secondary adsorption tower;Primary exhaust pipeline and secondary exhaust pipeline are connected to the first port of second three-way valve in parallel, and the second port of second three-way valve is connected to tail gas collecting pipeline, and the third port of second three-way valve is connected with nitrogen injection pipeline.The utility model realizes the switching of styrene raw material injection and styrene purification collection process, improves the coordination between each process and the degree of automation control, forms a complete set of styrene alumina adsorption purification system and process flow, and product purity is improved by more than 5%.

Description

Technical Field

[0001] This utility model relates to the technical field of petrochemical basic raw material production equipment, and in particular to a styrene purification device. Background Technology

[0002] Styrene is an important basic petrochemical raw material, widely used in synthetic rubber, engineering plastics, and other fields. During styrene production, a certain amount of polymerization inhibitors are added to prevent self-polymerization. As a synthetic raw material, these polymerization inhibitors have a significant impact on subsequent synthetic products, specifically in the following ways:

[0003] 1. Impact on reaction rate and conversion rate: Polymerization inhibitors interfere with the polymerization process of styrene, making it difficult to precisely control the reaction rate, resulting in reduced conversion rate, decreased production efficiency, and unstable product output. For example, in the synthesis of polystyrene, polymerization inhibitors can slow down the polymerization reaction, extending the originally planned production cycle and preventing the production capacity from being released as planned.

[0004] 2. Impact on product performance: Polymerization inhibitors can degrade the physical properties of synthesized products, leading to negative effects such as decreased transparency and reduced tensile strength. Taking the production of transparent plastic products as an example, residual polymerization inhibitors can cause problems such as cloudiness and reduced light transmittance, affecting the product's appearance and performance.

[0005] 3. Impact on product purity: The presence of polymerization inhibitors leads to insufficient purity and increased impurities in the synthetic raw materials, which has a significant impact on the production of high-end products. Especially in fields such as electronics and optics, where the purity requirements for materials are stringent, styrene containing polymerization inhibitors will result in substandard product performance, failing to meet market demands.

[0006] Therefore, developing a styrene purification system to remove polymerization inhibitors is of great significance for ensuring the quality of synthetic raw materials and improving product quality. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a styrene purification device to remove polymerization inhibitors and improve the purity of styrene.

[0008] To solve the above-mentioned technical problems, the technical solution of this utility model is: a styrene purification device, including a raw material storage tank and a receiving tank, and further including a primary adsorption tower, a secondary adsorption tower and a nitrogen cylinder, wherein the primary and secondary adsorption towers are filled with activated alumina adsorbent; the outlet of the raw material storage tank is connected to the inlet side of the feed pump through an outlet pipeline, and the outlet side of the feed pump is connected to the inlet of the primary adsorption tower through a primary feeding pipeline; the outlet of the primary adsorption tower is connected to a primary discharge pipeline, and the exhaust port of the primary adsorption tower is connected to a primary exhaust pipeline; the outlet of the secondary adsorption tower is connected to a secondary discharge pipeline, and the exhaust port of the secondary adsorption tower is connected to a secondary exhaust pipeline;

[0009] The primary discharge pipeline is connected to the first port of the first three-way valve. The second port of the first three-way valve is connected to the inlet of the secondary adsorption tower through the secondary feed pipeline. The third port of the first three-way valve is connected to the primary receiving pipeline. The primary receiving pipeline and the secondary discharge pipeline are connected in parallel to the inlet of the receiving tank. The first port and the second port of the first three-way valve form the secondary feed channel. The first port and the third port of the first three-way valve form the primary receiving channel.

[0010] The primary exhaust line and the secondary exhaust line are connected in parallel to the first port of the second three-way valve. The second port of the second three-way valve is connected to the exhaust gas collection line. The third port of the second three-way valve is connected to the nitrogen injection line, which is connected to the outlet of the nitrogen cylinder. The first and second ports of the second three-way valve form the exhaust gas emission channel, and the first and third ports of the second three-way valve form the nitrogen injection channel.

[0011] As a preferred technical solution, the top of the primary adsorption tower is also provided with a pressure relief port, which is connected to a primary safety discharge pipe. A primary safety valve is installed on the primary safety discharge pipe, and the primary safety discharge pipe is connected in parallel with the primary exhaust pipe. The top of the secondary adsorption tower is also provided with a pressure relief port, which is connected to a secondary safety discharge pipe. A secondary safety valve is installed on the secondary safety discharge pipe, and the secondary safety discharge pipe is connected in parallel with the secondary exhaust pipe.

[0012] A further improvement is that a flow meter and a flow regulating valve are installed on the primary feeding pipeline, and the flow regulating valve adjusts its opening degree according to the flow value detected by the flow meter.

[0013] As another improvement, two check valves connected in parallel are installed on the primary feed line near the outlet side of the feed pump.

[0014] As a preferred technical solution, the nitrogen injection pipeline is connected to multiple nitrogen cylinders, and the nitrogen injection pipeline is also connected in parallel to a compressed air pipeline, which is connected to a compressed air source.

[0015] As a preferred technical solution, it also includes a spray pipe and nozzles for cooling the receiving tank. A ground tank for storing water is provided on the side of the receiving tank. A submersible pump is installed in the ground tank. A spray pipe extending to the outside of the receiving tank is installed on the outlet side of the submersible pump. Multiple nozzles are installed at the end of the spray pipe opposite to the receiving tank.

[0016] As a further improvement, the bottom of the receiving tank is provided with a water collection trough, which is connected to a return water pipeline, which is connected to the return water port of the ground tank.

[0017] By adopting the above technical solution, this utility model uses a raw material storage tank as the feeding unit, and a feeding pump realizes the transportation of raw materials; a primary adsorption tower and a secondary adsorption tower constitute an adsorption unit, which adsorbs the polymerization inhibitor in styrene through the internally filled active alumina adsorbent and the switching of pipeline valves, thereby purifying styrene; a nitrogen cylinder serves as a regeneration unit to purge and regenerate the adsorbent saturated with alumina, restoring the adsorbent activity and making it recyclable; in addition, an exhaust pipeline is added to treat the tail gas generated during adsorption and regeneration, and a cooling unit composed of spray pipes, nozzles, submersible pumps, and other equipment is added to spray and cool the receiving tank for recycling, forming a complete device and process flow for styrene alumina adsorption and purification, which can produce high-purity styrene products with a purity increase of more than 5%, which can meet the needs of the high-end market.

[0018] A second three-way valve is installed in the exhaust pipes, tail gas collection pipelines, and nitrogen injection pipelines of the primary and secondary adsorption towers to facilitate the switching between tail gas emission and nitrogen injection processes. A first three-way valve is installed between the outlet of the primary adsorption tower, the inlet of the receiving tank, and the inlet of the secondary adsorption tower to enable the switching between styrene raw material injection and purified styrene collection processes, thereby improving the coordination and automation of each process and effectively increasing the efficiency of styrene purification. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0021] In the diagram: 1-Raw material storage tank; 11-Discharge valve; 12-Feed pump; 13-First manual ball valve; 14-Second manual ball valve; 15-Check valve; 16-First-stage feed valve; 2-First-stage adsorption tower; 21-First-stage exhaust valve; 22-First-stage safety valve; 23-First-stage discharge valve; 24-First-stage vent valve; 25-First three-way valve; 26-Second-stage feed valve; 3-Second-stage adsorption tower; 31-Second-stage exhaust valve; 32-Second-stage safety valve; 33-Second-stage vent valve; 34-Second-stage discharge valve; 35-First-stage receiving valve; 36-Manual ball valve; 4-Nitrogen cylinder; 41-Second three-way valve; 42-First control valve; 43-Second control valve; 5-Receiving tank; 51-Installation site; 52-Water collection tank; 53-Return water control valve; 6-Ground tank; 61-Submersible pump; 62-Spray control valve; 63-Spray head. Detailed Implementation

[0022] like Figure 1 As shown, a styrene purification apparatus includes a raw material storage tank 1 and a receiving tank 5, as well as a primary adsorption tower 2, a secondary adsorption tower 3 and a nitrogen cylinder 4. The primary adsorption tower 2 and the secondary adsorption tower 3 are filled with activated alumina adsorbent.

[0023] The outlet of raw material storage tank 1 is connected to the inlet of feed pump 12 via outlet pipeline J0-1. A discharge valve 11 is installed on the outlet side of raw material storage tank 1 via outlet pipeline J0-1 to control the output of raw materials from the storage tank. A first manual ball valve 13 and a second manual ball valve 14 are installed on the inlet and outlet sides of feed pump 12, respectively. The outlet side of feed pump 12 is connected to the inlet N101 of primary adsorption tower 2 via primary feed pipeline J0-2. Primary feed pipeline J0-2 is equipped with a primary feed valve 16, a flow meter FIC01, and a flow regulating valve FV-01. The flow regulating valve FV-01 adjusts its opening according to the flow rate detected by the flow meter FIC01. Under normal operating conditions, the feed flow rate is controlled at 200 L / h. Two parallel check valves 15 are also installed on the primary feed pipeline J0-2 near the outlet side of feed pump 12 to improve the reliability of pipeline feeding.

[0024] The discharge port N-104 of the primary adsorption tower 2 is connected to the primary discharge pipeline C1-3 and the primary venting pipeline C1-6. The primary discharge pipeline C1-3 is equipped with a primary discharge valve 23 to control the discharge from the primary adsorption tower. The primary venting pipeline C1-6 is equipped with a primary venting valve 24. The exhaust port N102 of the primary adsorption tower 2 is connected to the primary exhaust pipeline C1-1, and the primary exhaust pipeline C1-1 is equipped with a primary exhaust valve 21. The top of the primary adsorption tower 2 is also equipped with a pressure relief port N103, which is connected to a primary safety discharge pipeline C1-2. The primary safety discharge pipeline C1-2 is equipped with a primary safety valve 22. The primary safety discharge pipeline C1-2 is connected in parallel with the primary exhaust pipeline C1-1. Under normal conditions, the primary safety valve 22 is closed. When the internal pressure of the primary adsorption tower 2 exceeds the pressure threshold of the primary safety valve 22, the primary safety valve 22 opens, and the pressure is released through the primary safety discharge pipeline C1-2.

[0025] The discharge port N-204 of the secondary adsorption tower 3 is connected to the secondary discharge pipeline C2-3 and the secondary venting pipeline C2-4. A secondary discharge valve 34 is installed on the secondary discharge pipeline C2-3 to control the discharge of the secondary adsorption tower. A secondary venting valve 33 is installed on the secondary venting pipeline C2-4. The exhaust port N202 of the secondary adsorption tower 3 is connected to the secondary exhaust pipeline C2-1. A secondary exhaust valve 31 is installed on the secondary exhaust pipeline C2-1. The top of the secondary adsorption tower 3 is also equipped with a pressure relief port N203, which is connected to the secondary safety discharge pipeline C2-2. A secondary safety valve 32 is installed on the secondary safety discharge pipeline C2-2. The secondary safety discharge pipeline C2-2 is connected in parallel with the secondary exhaust pipeline C2-1.

[0026] The primary discharge pipeline C1-3 is connected to the first port of the first three-way valve 25. The second port of the first three-way valve 25 is connected to the inlet N201 of the secondary adsorption tower 3 via the secondary feed pipeline C1-4. A secondary feed valve 26 is installed on the secondary feed pipeline C1-4 to control the raw material from the primary adsorption tower 2 into the secondary adsorption tower 3. The third port of the first three-way valve 25 is connected to the primary receiving pipeline C1-5. The primary receiving pipeline C1-5 and the secondary discharge pipeline C2-3 are connected in parallel to the inlet N501 of the receiving tank 5. A primary receiving valve 35 is installed on the primary receiving pipeline C1-5 to control the flow of raw material from the primary adsorption tower 2 to the receiving tank 5. For easy on-site control, a manual ball valve 36 is installed on the primary receiving pipeline C1-5.

[0027] The first port and the second port of the first three-way valve 25 form a secondary feeding channel; the first port and the third port of the first three-way valve 25 form a primary receiving channel. When raw materials are fed, the first three-way valve 25 switches to the secondary feeding channel; when receiving materials, the first three-way valve 25 switches to the primary receiving channel.

[0028] The primary exhaust line C1-1 and the secondary exhaust line C2-1 are connected in parallel to the first port of the second three-way valve 41 via line CQ-1. The second port of the second three-way valve 41 is connected to the exhaust gas collection line CQ-2. The third port of the second three-way valve 41 is connected to the nitrogen injection line JQ-1 via line JQ-3. The nitrogen injection line JQ-3 is connected to the outlet of the nitrogen cylinder 4. Preferably, the nitrogen injection line JQ-1 is connected to multiple nitrogen cylinders 4 for nitrogen injection. Pipeline JQ-1 is also connected in parallel to compressed air pipeline JQ-2. Compressed air pipeline JQ-2 is connected to a compressed air source. Compressed air pipeline JQ-2 is equipped with a second control valve 43. Nitrogen injection pipeline JQ-1 is equipped with a first control valve 42. The second control valve 43 and the first control valve 42 are interlocked. When injecting nitrogen, the first control valve 42 is open and the second control valve 43 is closed. When injecting compressed air, the second control valve 43 is open and the first control valve 42 is closed.

[0029] The first and second ports of the second three-way valve 41 constitute the exhaust gas discharge channel, and the first and third ports of the second three-way valve 41 constitute the nitrogen injection channel. During feeding, the second three-way valve 41 switches to the exhaust gas discharge channel to discharge the gas inside the first adsorption tower 2 and the second adsorption tower 3. During receiving, the second three-way valve 41 switches to the nitrogen injection channel, and the compressed air pipeline JQ-2 or the nitrogen injection pipeline JQ-1 injects the gas into the first adsorption tower 2 and the second adsorption tower 3 through the pipeline JQ-3.

[0030] To cool the receiving tank 5, a ground tank 6 for storing water is provided on the side of the receiving tank 5. A submersible pump 61 is installed in the ground tank 6. A spray pipe CL-1 extending to the outside of the receiving tank 6 is installed on the outlet side of the submersible pump 61. Multiple nozzles 63 are installed at the end of the spray pipe CL-1 opposite to the receiving tank 5. A spray control valve 62 is installed on the spray pipe CL-1 to control the delivery of cooling water.

[0031] A water collection trough 52 is provided at the installation site 51 at the bottom of the receiving tank 5. The water collection trough 52 is connected to the return water pipeline CL-2. A return water control valve 53 is installed on the return water pipeline CL-2. The return water pipeline CL-2 is connected to the return water port N602 of the ground tank 6.

[0032] The workflow of this utility model is as follows:

[0033] Styrene raw material is pumped from raw material storage tank 1 into primary adsorption tower 2 via feed pump 12. First, the primary feed valve 16 and the primary exhaust valve 21 at the top of primary adsorption tower 2 are opened, and the styrene raw material fills primary adsorption tower 2. After the air inside the tower is completely discharged, the alumina adsorbent is fully contacted, and impurities are adsorbed. The primary exhaust valve 21 is closed, and at the same time, the primary discharge valve 23 at the bottom of primary adsorption tower 2, the secondary feed valve 26, and the secondary exhaust valve 31 at the top of secondary adsorption tower 3 are opened. The first three-way valve 25 is switched to the secondary feed channel, and the styrene raw material enters secondary adsorption tower 3 from primary adsorption tower 2. After the styrene raw material fills secondary adsorption tower 22, the air inside the tower is completely discharged, and secondary adsorption is carried out in secondary adsorption tower 3. At this time, the secondary exhaust valve 31 is closed, and at the same time, the secondary discharge valve 34 of secondary adsorption tower is opened to discharge material into receiving tank 5.

[0034] After adsorption is complete, close the primary feed valve 16, open the secondary exhaust valve 31 of the secondary adsorption tower 3, switch the second three-way valve 41 to the nitrogen injection channel to close the tail gas discharge, open the first control valve 42 to inject nitrogen into the secondary adsorption tower 3 to remove residual styrene. If the nitrogen supply is insufficient, the second control valve 43 can be opened first to inject compressed air into the second adsorption tower 3. After the compressed air has been introduced for a period of time, open the first control valve 42, close the second control valve 43, and inject nitrogen into the second adsorption tower 3.

[0035] After the nitrogen gas is discharged and contains no material, the secondary discharge valve 34 and the secondary exhaust valve 31 are closed. The first three-way valve 25 is switched to the primary receiving channel, and the primary discharge valve 23 and the primary exhaust valve 21 are opened. The purified styrene in the primary adsorption tower 2 flows to the receiving tank 5.

[0036] Once the nitrogen gas is discharged without any material, open the secondary discharge valve 34 and the secondary exhaust valve 31 to continue purging the primary adsorption tower 2 and the secondary adsorption tower 3 for ten minutes to clean and regenerate the alumina. After purging, close the primary discharge valve 23 and the primary exhaust valve 21, close the secondary discharge valve 34 and the secondary exhaust valve 31, switch the second three-way valve 41 to the exhaust gas channel, and switch the first three-way valve 25 to the secondary feed channel, awaiting the start of the next feeding process.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A styrene purification apparatus, comprising a raw material storage tank and a receiving tank, characterized in that: It also includes a primary adsorption tower, a secondary adsorption tower, and a nitrogen cylinder. The primary and secondary adsorption towers are filled with activated alumina adsorbent. The outlet of the raw material storage tank is connected to the inlet of the feed pump via an outlet pipeline, and the outlet of the feed pump is connected to the inlet of the primary adsorption tower via a primary feeding pipeline. The outlet of the primary adsorption tower is connected to a primary discharge pipeline, and the exhaust port of the primary adsorption tower is connected to a primary exhaust pipeline. The outlet of the secondary adsorption tower is connected to a secondary discharge pipeline, and the exhaust port of the secondary adsorption tower is connected to a secondary exhaust pipeline. The primary discharge pipeline is connected to the first port of the first three-way valve. The second port of the first three-way valve is connected to the inlet of the secondary adsorption tower through the secondary feed pipeline. The third port of the first three-way valve is connected to the primary receiving pipeline. The primary receiving pipeline and the secondary discharge pipeline are connected in parallel to the inlet of the receiving tank. The first port and the second port of the first three-way valve form the secondary feed channel. The first port and the third port of the first three-way valve form the primary receiving channel. The primary exhaust line and the secondary exhaust line are connected in parallel to the first port of the second three-way valve. The second port of the second three-way valve is connected to the exhaust gas collection line. The third port of the second three-way valve is connected to the nitrogen injection line, which is connected to the nitrogen cylinder outlet. The first and second ports of the second three-way valve form the exhaust gas emission channel, and the first and third ports of the second three-way valve form the nitrogen injection channel.

2. The styrene purification apparatus as described in claim 1, characterized in that: The top of the primary adsorption tower is also provided with a pressure vent, which is connected to a primary safety discharge pipe. A primary safety valve is installed on the primary safety discharge pipe, and the primary safety discharge pipe is connected in parallel with the primary exhaust pipe. The top of the secondary adsorption tower is also provided with a pressure vent, which is connected to a secondary safety discharge pipe. A secondary safety valve is installed on the secondary safety discharge pipe, and the secondary safety discharge pipe is connected in parallel with the secondary exhaust pipe.

3. The styrene purification apparatus as described in claim 1, characterized in that: The primary feed pipeline is equipped with a flow meter and a flow regulating valve. The flow regulating valve adjusts its opening degree according to the flow value detected by the flow meter.

4. A styrene purification apparatus as described in claim 1 or 3, characterized in that: Two check valves connected in parallel are installed on the primary feed pipeline near the outlet side of the feed pump.

5. The styrene purification apparatus as described in claim 1, characterized in that: The nitrogen injection line is connected to multiple nitrogen cylinders, and the nitrogen injection line is also connected in parallel to a compressed air line, which is connected to a compressed air source.

6. The styrene purification apparatus as described in claim 1, characterized in that: It also includes a spray pipe and nozzles for cooling the receiving tank. A ground tank for storing water is provided on the side of the receiving tank. A submersible pump is installed in the ground tank. A spray pipe extending to the outside of the receiving tank is installed on the outlet side of the submersible pump. Multiple nozzles are installed at the end of the spray pipe opposite to the receiving tank.

7. A styrene purification apparatus as described in claim 6, characterized in that: The bottom of the receiving tank is equipped with a water collection trough, which is connected to a return water pipeline, which is connected to the return water inlet of the ground tank.

Images