Divinylbenzene preparation apparatus

Abstract

This invention discloses a divinylbenzene preparation apparatus, comprising a raw material purification unit, a reaction unit, a separation and purification unit, and a waste heat recovery unit. The outlet of the raw material purification unit is connected to the inlet of the reaction unit via a pipeline, and the outlet of the reaction unit is connected to the inlet of the separation and purification unit via a pipeline. The waste heat recovery unit is connected to both the reaction unit and the separation and purification unit. This invention includes a raw material purification unit that removes impurities from the raw materials using filters and adsorption towers, avoiding the influence of impurities on the catalyst, extending the catalyst's lifespan, and improving reaction efficiency. The reaction unit employs a tubular fixed-bed reactor, which facilitates control of reaction conditions and improves reaction conversion and selectivity. The separation and purification unit combines a condenser, a gas-liquid separator, and a distillation column. In particular, the distillation column is equipped with corrugated metal packing, which improves the separation and purification effect of the product, resulting in a high-purity divinylbenzene product.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a divinylbenzene preparation apparatus. Background Technology

[0002] Divinylbenzene is an important chemical raw material widely used in the production of ion exchange resins, ion exchange membranes, ABS resins, polystyrene resins, and unsaturated polyester resins. Divinylbenzene is generally produced from diethylbenzene through a dehydrogenation reaction, which usually requires a catalyst.

[0003] Currently, existing diethylenebenzene preparation equipment is inadequate in its raw material processing. Small amounts of impurities in the diethylenebenzene raw material, such as sulfides and moisture, can easily lead to catalyst deactivation, affecting reaction efficiency and catalyst lifespan. Furthermore, traditional separation devices often fail to achieve satisfactory product separation and purification, resulting in low product purity. The entire preparation process also consumes a significant amount of energy, which is detrimental to energy conservation and environmental protection. Therefore, we have proposed a diethylenebenzene preparation device to address the aforementioned problems. Utility Model Content

[0004] The purpose of this invention is to overcome the aforementioned problems in the prior art and to provide a divinylbenzene preparation apparatus to improve the purity of raw materials, increase reaction efficiency and product purity, and reduce energy consumption.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a divinylbenzene preparation apparatus, comprising a raw material purification unit, a reaction unit, a separation and purification unit, and a waste heat recovery unit. The outlet of the raw material purification unit is connected to the inlet of the reaction unit via a pipeline, and the outlet of the reaction unit is connected to the inlet of the separation and purification unit via a pipeline. The waste heat recovery unit is connected to both the reaction unit and the separation and purification unit.

[0006] Preferably, the raw material purification unit includes a filter, an adsorption tower, and a preheater connected in sequence. The inlet of the filter is used to introduce the raw material diethylbenzene, and the outlet of the preheater is connected to the inlet of the reaction unit.

[0007] Preferably, the adsorption tower is filled with an adsorbent, which is a molecular sieve or activated carbon.

[0008] Preferably, the reaction unit is a tubular fixed-bed reactor, and a catalyst layer is provided inside the tubular fixed-bed reactor, wherein the catalyst layer is an iron-based catalyst.

[0009] Preferably, the separation and purification unit includes a condenser, a gas-liquid separator, and a distillation column connected in sequence. The inlet of the condenser is connected to the outlet of the reaction unit, and the top of the distillation column is provided with a product outlet, and the bottom is provided with a residual liquid outlet.

[0010] Preferably, the distillation column is provided with a packing layer, and the packing layer is made of corrugated metal packing.

[0011] Preferably, the waste heat recovery unit includes a waste heat boiler and a heat exchanger. The waste heat boiler is connected to the reaction unit, and the heat exchanger is connected to both the waste heat boiler and the separation and purification unit.

[0012] Preferably, valves and delivery pumps are installed on the pipelines between each unit.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) The present invention is equipped with a raw material purification unit, which removes impurities in the raw materials through filters and adsorption towers, thereby avoiding the influence of impurities on the catalyst, extending the service life of the catalyst, and improving the reaction efficiency.

[0015] (2) The reaction unit adopts a tubular fixed-bed reactor, which is conducive to controlling the reaction conditions and improving the conversion rate and selectivity of the reaction.

[0016] (3) The separation and purification unit adopts a combination of condenser, gas-liquid separator and distillation column. In particular, the distillation column is equipped with metal corrugated packing, which improves the separation and purification effect of the product and the resulting divinylbenzene product has high purity.

[0017] (4) The waste heat recovery unit recovers and utilizes the heat generated during the reaction process, which reduces the energy consumption of the device, improves the economy, and meets the requirements of energy conservation and environmental protection. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the process of this utility model.

[0019] In the diagram: 1. Raw material purification unit; 2. Reaction unit; 3. Separation and purification unit; 4. Waste heat recovery unit; 5. Filter; 6. Adsorption tower; 7. Preheater; 8. Tubular fixed bed reactor; 9. Catalyst layer; 10. Condenser; 11. Gas-liquid separator; 12. Distillation tower; 13. Packing layer; 14. Product outlet; 15. Residual liquid outlet; 16. Waste heat boiler; 17. Heat exchanger; 18. Valve; 19. Transfer pump. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1 The present invention provides a technical solution: a divinylbenzene preparation device, comprising a raw material purification unit 1, a reaction unit 2, a separation and purification unit 3, and a waste heat recovery unit 4. The outlet of the raw material purification unit 1 is connected to the inlet of the reaction unit 2 through a pipe, and the outlet of the reaction unit 2 is connected to the inlet of the separation and purification unit 3 through a pipe. The waste heat recovery unit 4 is connected to both the reaction unit 2 and the separation and purification unit 3.

[0022] The raw material purification unit 1 includes a filter 5, an adsorption tower 6, and a preheater 7 connected in sequence. The inlet of the filter 5 is used to introduce the raw material diethylbenzene, and the outlet of the preheater 7 is connected to the inlet of the reaction unit 2. The filter 5 can remove solid impurities from the raw material, the adsorption tower 6 is used to adsorb impurities such as sulfides and moisture from the raw material, and the preheater 7 preheats the purified raw material, which is beneficial to the subsequent dehydrogenation reaction.

[0023] The adsorption tower 6 is filled with adsorbent, which is a molecular sieve or activated carbon. Molecular sieves and activated carbon have good adsorption performance and can effectively remove impurities from the raw materials.

[0024] Reaction unit 2 is a tubular fixed-bed reactor 8, which contains a catalyst layer 9, which uses an iron-based catalyst. The tubular fixed-bed reactor 8 features high heat transfer efficiency and easy control of reaction conditions, and the iron-based catalyst exhibits high catalytic activity for the dehydrogenation reaction of diethylbenzene.

[0025] The separation and purification unit 3 includes a condenser 10, a gas-liquid separator 11, and a distillation column 12 connected in sequence. The inlet of the condenser 10 is connected to the outlet of the reaction unit 2. The distillation column 12 has a product outlet 14 at the top and a residual liquid outlet 15 at the bottom. The condenser 10 cools the reaction products into a gas-liquid mixture, the gas-liquid separator 11 separates the liquid product, and the distillation column 12 purifies the liquid product by distillation to obtain a high-purity divinylbenzene product.

[0026] The distillation column 12 is equipped with a packing layer 13, which is made of corrugated metal packing. Corrugated metal packing has the advantages of large specific surface area and high mass transfer efficiency, which can improve the distillation effect.

[0027] The waste heat recovery unit 4 includes a waste heat boiler 16 and a heat exchanger 17. The waste heat boiler 16 is connected to the reaction unit 2, and the heat exchanger 17 is connected to both the waste heat boiler 16 and the separation and purification unit 3. The waste heat boiler 16 recovers the high-temperature heat generated by the reaction unit 2 to produce steam. The heat exchanger 17 uses the heat of the steam to heat the materials in the separation and purification unit 3, thereby realizing the recovery and utilization of waste heat and reducing energy consumption.

[0028] Furthermore, the water introduced into the waste heat boiler 16 is heated by the high-temperature heat generated by the recovery reaction unit 2 to produce steam. Before entering the waste heat boiler 16, the water first passes through the heat exchanger 17 to exchange heat with the high-temperature waste liquid produced by the distillation column 12, recovering the heat in the waste liquid. This allows the water to be preliminarily heated before entering the waste heat boiler 16, which facilitates the rapid generation of steam in the waste heat boiler 16, reduces the heat exchange energy consumption of the waste heat boiler 16, and increases energy efficiency.

[0029] Each unit is connected to a pipeline equipped with a valve 18 and a conveying pump 19. The valve 18 is used to control the flow rate and on / off state of the material, and the conveying pump 19 provides power for the conveying of the material.

[0030] The working process of this utility model is as follows: The raw material diethylbenzene first enters the filter 5 to remove solid impurities, and then enters the adsorption tower 6. Under the action of the adsorbent, impurities such as sulfides and moisture are adsorbed and removed. The purified raw material enters the preheater 7 for preheating. The preheated raw material enters the tubular fixed bed reactor 8, where a dehydrogenation reaction occurs under the action of the catalyst layer 9 to generate diethylenebenzene. The reaction product enters the condenser 10 to be cooled into a gas-liquid mixture. The gas-liquid mixture enters the gas-liquid separator 11 to separate the liquid product. The liquid product enters the distillation tower 12, where it is purified by distillation under the action of the packing layer 13. High-purity diethylenebenzene product is obtained from the product outlet 14 at the top of the distillation tower 12, and the residual liquid is discharged from the residual liquid outlet 15 at the bottom. The high-temperature heat generated during the reaction is recovered by the waste heat boiler 16 to generate steam. The steam is used to heat the material in the separation and purification unit 3 through the heat exchanger 17, realizing the recovery and utilization of waste heat. All contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A divinylbenzene production apparatus characterized by comprising: It includes a raw material purification unit, a reaction unit, a separation and purification unit, and a waste heat recovery unit. The outlet of the raw material purification unit is connected to the inlet of the reaction unit through a pipeline, and the outlet of the reaction unit is connected to the inlet of the separation and purification unit through a pipeline. The waste heat recovery unit is connected to both the reaction unit and the separation and purification unit. The raw material purification unit includes a filter, an adsorption tower, and a preheater connected in sequence. The inlet of the filter is used to introduce the raw material diethylbenzene, and the outlet of the preheater is connected to the inlet of the reaction unit. The reaction unit is a tubular fixed-bed reactor, and a catalyst layer is provided inside the tubular fixed-bed reactor. The catalyst layer is an iron-based catalyst. The separation and purification unit includes a condenser, a gas-liquid separator, and a distillation column connected in sequence. The inlet of the condenser is connected to the outlet of the reaction unit. The top of the distillation column is provided with a product outlet, and the bottom is provided with a residual liquid outlet. The waste heat recovery unit includes a waste heat boiler and a heat exchanger. The waste heat boiler is connected to the reaction unit, and the heat exchanger is connected to both the waste heat boiler and the separation and purification unit. Valves and delivery pumps are installed on the pipelines between each unit.

2. The divinylbenzene preparation apparatus according to claim 1, characterized in that: The adsorption tower is filled with an adsorbent, which is a molecular sieve or activated carbon.

3. The divinylbenzene preparation apparatus according to claim 1, characterized in that: The distillation column is equipped with a packing layer, which is made of corrugated metal packing.

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