Butyl acrylate catalytic reaction recovery system

Abstract

The utility model discloses a butyl acrylate catalytic reaction recovery system, and belongs to the technical field of butyl acrylate. According to the technical scheme, the device comprises a rectification unit I, a rectification unit II, an alkali washing unit and a recovery unit, the rectifying unit I comprises a rectifying tower I, and the top of the rectifying tower I is sequentially connected with a condenser I and a phase splitter I through a pipeline; the second rectification unit comprises a second rectification tower and a second condenser arranged at the top of the second rectification tower, the alkali washing unit comprises an alkali washing tank and a water washing tank, the second condenser is sequentially communicated with the catalyst extraction tower and the water washing tank through pipelines, and the water washing tank is connected with a second phase splitter through a pipeline; a tower kettle of the rectifying tower I is provided with a reboiler I; a water phase outlet of the catalyst extraction tower is connected with a fresh acrylic acid feeding pipeline through a pipeline; and the phase splitter II is connected with the butyl acrylate storage tank and the waste liquid storage tank through pipelines. By optimizing the technological process and equipment configuration, the heat utilization efficiency is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of butyl acrylate, and particularly relates to a catalytic reaction recovery system for butyl acrylate. Background Technique

[0002] Butyl acrylate (BA) is an organic chemical raw material with wide applications. In the coating industry, it is used as a film-forming agent and modifier, which can improve the elasticity and water resistance of the coating film; in the adhesive field, it is used to manufacture pressure-sensitive adhesives and other types of adhesives, with good adhesion performance; in addition, butyl acrylate is also used as a plastic modifier to improve the flexibility and processing performance of plastics. Due to its unique chemical properties, butyl acrylate plays an indispensable role in many industrial fields.

[0003] In the production process of butyl acrylate, the catalytic esterification reaction is the core step, which is carried out by reacting acrylic acid with butanol under the action of a catalyst. This process usually requires precise control of reaction conditions, including temperature, pressure, and the activity of the catalyst, to ensure a high conversion rate and product quality. However, the existing production technologies have some limitations: in the existing production process of butyl acrylate, a single distillation unit often fails to achieve an ideal separation effect, resulting in a low purity of the crude butyl acrylate produced; the heat utilization efficiency is low, leading to a high overall energy consumption, which not only increases the production cost but also does not conform to the industrial development trend of energy conservation and emission reduction; after the catalytic reaction, the uncompletely recovered catalyst will cause difficulties in subsequent treatment, not only increasing the production cost but also possibly generating a large amount of wastewater, putting pressure on the environment. Content of the Utility Model

[0004] The utility model provides a catalytic reaction recovery system for butyl acrylate, which improves the heat utilization efficiency, reduces the energy consumption, and simultaneously realizes the effective recovery of the catalyst by optimizing the process flow and equipment configuration, thereby reducing the production cost, enhancing the market competitiveness of the product, and reducing the impact on the environment.

[0005] The technical solution of the utility model is as follows:

[0006] Butyl acrylate catalytic reaction recovery system, including distillation unit 1, distillation unit 2, catalyst extraction tower and caustic washing unit; said distillation unit 1 includes distillation column 1, the top of distillation column 1 is sequentially connected with condenser 1 and phase separator 1 through pipelines; distillation unit 2 includes distillation column 2 and condenser 2 arranged at the top of distillation column 2, the oil phase outlet of phase separator 1 is provided with two branch pipelines, one pipeline is communicated with the bottom of distillation column 2, and the other pipeline is communicated with the top of distillation column 1, fresh acrylic acid addition pipeline is arranged on distillation column 2; caustic washing unit includes caustic washing tank and water washing tank, condenser 2 is sequentially communicated with catalyst extraction tower, caustic washing tank and water washing tank through pipelines, and the water washing tank is connected with phase separator 2 through pipelines; distillation column 1 is provided with rectifying section, reaction section and stripping section, fresh acrylic acid feed pipeline, catalyst solution feed pipeline and fresh butanol feed pipeline are arranged in the reaction section, inhibitor feed pipeline is arranged at the top of distillation column 1, reboiler 1 is arranged at the bottom of distillation column 1, reboiler 1 and the bottom of the column are communicated through the bottom reboiler circulation pipeline, and the bottom of the column is also provided with bottom liquid circulation pipeline; the water phase outlet of the catalyst extraction tower is connected with the fresh acrylic acid feed pipeline through a pipeline; phase separator 2 is connected with butyl acrylate storage tank and waste liquid storage tank through pipelines.

[0007] Preferably, the fresh acrylic acid feed pipeline is arranged above the fresh butanol feed pipeline, which is beneficial to the uniform mixing and reaction of raw materials in the reaction section, and improves the reaction efficiency.

[0008] Preferably, spray pipes are arranged in the catalyst extraction tower, and the liquid outlet direction of the spray pipes is in countercurrent contact with the catalyst-containing material, which enhances the extraction effect and improves the recovery rate of the catalyst.

[0009] Preferably, a preheater is arranged on the fresh butanol feed pipeline and heated by steam. The preheated butanol can be mixed with acrylic acid faster and reach the reaction temperature, reducing energy consumption and shortening the reaction time.

[0010] Preferably, a reboiler 2 is arranged at the bottom of distillation column 2.

[0011] Preferably, multiple trays are arranged in the catalyst extraction tower, and the number of trays is 4 - 6. The design of multiple trays is beneficial to mass transfer and heat transfer in the extraction process, and further improves the recovery efficiency of the catalyst.

[0012] Preferably, a jacket is arranged on the outer periphery of the caustic washing tank, a preheating pipeline is arranged in the jacket, the outlet of the preheating pipeline is communicated with the fresh acrylic acid addition pipeline, and the inlet of the preheating pipeline is connected with the external acrylic acid conveying pipeline.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model improves the heat utilization efficiency, reduces energy consumption, realizes the recovery of catalysts, reduces production costs, enhances the market competitiveness of products, and reduces the impact on the environment by optimizing the process flow and equipment configuration.

[0015] 2. The second rectification column can not only further rectify to improve the purity of butyl acrylate, but also completely react the unreacted butanol in the rectification column, increase the output while reducing butanol as an impurity, and then perform alkali washing and water washing to remove the catalyst and raw material acrylic acid in the product, thereby improving the purity of butyl acrylate.

[0016] 3. The interlayer provided on the outer layer of the alkali washing tower can preheat the supplementary acrylic acid entering the second rectification column by using the heat released from the alkali washing tank, improving the energy utilization efficiency.

[0017] 4. The aqueous phase outlet of the catalyst extraction tower is connected to the fresh acrylic acid feed pipeline through a pipeline, which can recycle the unreacted catalyst, reduce the workload of subsequent alkali washing and water washing, and reduce production costs. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the butyl acrylate catalytic reaction recovery system of the utility model.

[0019] In the figure, 1 is the first rectification column; 101 is the rectification section; 102 is the reaction section; 103 is the stripping section; 104 is the fresh acrylic acid feed pipeline; 105 is the catalyst solution feed pipeline; 106 is the fresh butanol feed pipeline; 107 is the inhibitor feed pipeline; 2 is the second rectification column; 3 is the first condenser; 4 is the first phase separator; 5 is the second condenser; 6 is the fresh acrylic acid supplementary pipeline; 7 is the alkali washing tank; 8 is the water washing tank; 9 is the catalyst extraction tower; 10 is the second phase separator; 11 is the first reboiler; 12 is the tower kettle reboiler circulation pipeline; 13 is the tower kettle liquid circulation pipeline; 14 is the butyl acrylate storage tank; 15 is the waste liquid storage tank; 16 is the second reboiler. Detailed Embodiments

[0020] In order to enable those skilled in the art to better understand the technical solutions in the utility model, the following will clearly and completely describe the technical solutions in the embodiments of the utility model with reference to the accompanying drawings in the embodiments of the utility model.

[0021] Embodiment 1

[0022] As Figure 1As shown in the figure, this embodiment provides a recovery system for acrylic butyl ester catalytic reaction, including a first distillation unit, a second distillation unit, a catalyst extraction tower 9 and an alkali washing unit; the first distillation unit includes a first distillation column 1, the top of the first distillation column 1 is sequentially connected with a first condenser 3 and a first phase separator 4 through pipelines; the second distillation unit includes a second distillation column 2 and a second condenser 5 arranged at the top of the second distillation column 2, the oil phase outlet of the first phase separator 4 is provided with two branch pipelines, one pipeline is communicated with the bottom of the second distillation column 2, and the other pipeline is communicated with the top of the first distillation column 1, the second distillation column 2 is provided with a fresh acrylic acid supplement pipeline 6; the first distillation column 1 is provided with a rectifying section 101, a reaction section 102 and a stripping section 103, the reaction section 102 is provided with a fresh acrylic acid feed pipeline 104, a catalyst solution feed pipeline 105 and a fresh butanol feed pipeline 106, the fresh acrylic acid feed pipeline 104 is arranged above the fresh butanol feed pipeline 106, the fresh butanol feed pipeline 106 is provided with a preheater, the top of the first distillation column 1 is provided with a polymerization inhibitor feed pipeline 107, the bottom of the first distillation column 1 is provided with a first reboiler 11, the first reboiler 11 is communicated with the bottom of the column through a column bottom reboiler circulation pipeline 12, and the bottom of the column is also provided with a column bottom liquid circulation pipeline 13;

[0023] The bottom of the second distillation column 2 is provided with a second reboiler 16; the alkali washing unit includes an alkali washing tank 7 and a water washing tank 8, the outer periphery of the alkali washing tank is provided with a jacket, a preheating pipeline is arranged in the jacket, the outlet of the preheating pipeline is communicated with the fresh acrylic acid supplement pipeline 6, and the inlet of the preheating pipeline is connected with an external acrylic acid conveying pipeline;

[0024] The second condenser 5 is sequentially communicated with the catalyst extraction tower 9, the alkali washing tank 7 and the water washing tank 8 through pipelines, the water washing tank 8 is connected with a second phase separator 10 through a pipeline; the water phase outlet of the catalyst extraction tower 9 is connected with the fresh acrylic acid feed pipeline 104 through a pipeline; a spray pipe and multiple trays are arranged in the catalyst extraction tower 9, the number of trays is set to 6, and the liquid outlet direction of the spray pipe is in countercurrent contact with the catalyst-containing material.

[0025] Working process:

[0026] Fresh acrylic acid is fed into the reaction section 102 from the upper part of the pipeline, fresh butanol is fed into the reaction section 102 through the pipeline, and the supplemented fresh catalyst solution is fed into the reaction section 102 through the pipeline. The polymerization inhibitor is added to the top of the tower through the pipeline; acrylic acid and butanol react in the liquid layer on the trays of the reaction section 102, and at the same time, the produced butyl acrylate and by-products are distilled out of the liquid phase under the action of azeotropy; the gas-phase mixture at the top of the tower passes through the pipeline, is condensed by the condenser 3, and then stratified in the phase separator 4 to separate the organic phase rich in butyl acrylate and the aqueous phase containing a small amount of organic matter; part of the aqueous phase is refluxed to the top of the tower through the pipeline as a component for forming a binary or ternary azeotropic system, and the remaining aqueous phase is sent to the subsequent system through the pipeline to recover butanol and butyl acrylate; the organic phase is partially refluxed to the top of the first distillation column 1 through the pipeline, thereby effectively reducing the acrylic acid concentration in the rectification section 101, and the remaining organic phase is fed into the second distillation column 2 through the pipeline. The bottom liquid of the first distillation column 1 returns to the bottom of the column through the pipeline via the reboiler 11 to provide the rectification heat load; part of the bottom liquid returns directly to the reaction section 102 through the pipeline to recover the catalyst and polymerization inhibitor therein, so that the catalyst in the liquid layer on the trays of the reaction section 102 is maintained at a certain concentration; the remaining bottom liquid enters the second distillation column 2 through the pipeline to continue the reaction.

[0027] Acrylic acid is continuously added to the second distillation column 2, heated and reacted to improve the purity and yield of butyl acrylate and remove butanol. Then it passes through the condenser 5 and enters the catalyst extraction tower 9. In the catalyst extraction tower 9, through the action of the spray pipe and multi-stage trays, the material containing the catalyst contacts the extractant countercurrently, increasing the contact area and contact time to achieve effective extraction of the catalyst. The aqueous phase after extraction contains some unreacted catalyst and returns to the fresh acrylic acid feed pipeline 104 for recycling; the oil phase enters the alkali washing tank 7 for acid removal by alkali washing, then enters the water washing tank 8 for water washing to remove salts, and finally the finished product of butyl acrylate is separated. Overall, alkali washing and water washing are separated to ensure acid removal while also removing some impurities. At the same time, the heat of alkali washing is used for circulation to improve energy efficiency; the neutralized liquid overflows into the water washing tank 8 to reduce the entry of impurities and enters the water washing tank 8 for further washing treatment. After the material in the water washing tank 8 is washed with water, it enters the phase separator 10 for gas-liquid separation. Finally, the separated butyl acrylate product is collected into the butyl acrylate storage tank 14 through the corresponding pipeline, and the waste water first flows into the waste liquid storage tank 15 for environmental protection treatment.

Claims

1. Butyl acrylate catalytic reaction recovery system, characterized in that: It comprises a distillation unit 1, a distillation unit 2, a catalyst extraction tower (9) and an alkali washing unit; The distillation unit 1 comprises a distillation tower 1 (1), the top of which is connected in sequence to a condenser 1 (3) and a phase separator 1 (4) via pipelines; The second distillation unit comprises a second distillation tower (2) and a second condenser (5) arranged at the top of the second distillation tower (2). The oil phase outlet of the first phase separator (4) is provided with two branch pipelines, one pipeline is connected to the bottom of the second distillation tower (2), and the other pipeline is connected to the top of the first distillation tower (1). The second distillation tower (2) is provided with a fresh acrylic acid supply pipeline (6); The alkali washing unit comprises an alkali washing tank (7) and a water washing tank (8); the second condenser (5) is connected to the catalyst extraction tower (9), the alkali washing tank (7) and the water washing tank (8) in sequence through pipelines; the water washing tank (8) is connected to the second phase separator (10) through pipelines; The distillation tower (1) is provided with a distillation section (101), a reaction section (102) and a stripping section (103); the reaction section (102) is provided with a fresh acrylic acid feed pipeline (104), a catalyst solution feed pipeline (105) and a fresh butanol feed pipeline (106); the top of the distillation tower (1) is provided with an inhibitor feed pipeline (107); the bottom of the distillation tower (1) is provided with a reboiler (11); the reboiler (11) and the bottom are connected via a bottom reboiler circulation pipeline (12); the bottom is also provided with a bottom liquid circulation pipeline (13); The water phase outlet of the catalyst extraction tower (9) is connected to a fresh acrylic acid feed pipeline (104) via a pipeline; Phase separator 2 (10) is connected to the butyl acrylate storage tank (14) and the waste liquid storage tank (15) through pipelines.

2. The butyl acrylate catalytic reaction recovery system according to claim 1, characterized in that: The fresh acrylic acid feed line (104) is arranged above the fresh butanol feed line (106).

3. The butyl acrylate catalytic reaction recovery system according to claim 1, characterized in that: A spray pipe is arranged in the catalyst extraction tower (9), and the liquid outlet direction of the spray pipe is in countercurrent contact with the catalyst-containing material.

4. The butyl acrylate catalytic reaction recovery system according to claim 1, characterized in that: The fresh butanol feed line (106) is provided with a preheater.

5. The butyl acrylate catalytic reaction recovery system according to claim 1, characterized in that: A second reboiler (16) is provided at the bottom of the second distillation tower (2).

6. The butyl acrylate catalytic reaction recovery system according to claim 1, characterized in that: The catalyst extraction tower (9) is provided with multiple stages of tower plates.

7. The butyl acrylate catalytic reaction recovery system according to claim 1, characterized in that: An interlayer is arranged on the outer periphery of the alkaline washing tank (7), a preheating pipeline is arranged in the interlayer, the outlet of the preheating pipeline is connected to the fresh acrylic acid supply pipeline (6), and the feed port of the preheating pipeline is connected to the external acrylic acid delivery pipeline.

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