Impurity removal system for 4, 4 '-diaminodiphenyl ether production

Abstract

The utility model relates to the technical field of chemical industry production, in particular to a 4, 5-difluoro-4, 6- According to the impurity removal system for 4, 4 '-diaminodiphenyl ether production, the discharging end of a chemical material kettle is connected with the feeding end of a filter press through a pipeline, the discharging end of the filter press is connected with the feeding end of a hydrogenation kettle through a pipeline, the discharging end of the hydrogenation kettle is connected with the feeding end of a filter through a pipeline, and the discharging end of the filter is connected with the feeding end of the filter through a pipeline. The discharge end of the filter is connected with the feed end of the centrifugal machine through a pipeline, and the recovery end of the filter is connected with the feed port of the hydrogenation kettle through a pipeline. According to the utility model, the filter press is arranged, so that most impurities in the filter can be effectively removed in the production process, the utilization rate of a palladium-carbon catalyst is improved by 5%, and meanwhile, the use frequency of a filter element of the filter is increased; and the problem that the pipeline is easy to block in the production process is also avoided by removing the impurities, the replacement time of the filter cloth of the centrifugal machine is prolonged, the production efficiency is improved, and meanwhile, the production cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, in particular to an impurity removal system for the production of 4,4'-diaminodiphenyl ether. Background Technique

[0002] 4,4'-diaminodiphenyl ether is an organic compound with the chemical formula C 12 H 12 N 2O , which is mainly used to produce heat-resistant plastics such as polyimide resin, polymaleimide resin, polyamideimide resin, polyesterimide resin, epoxy resin, polyurethane, etc., and can also be used as a cross-linking agent. Currently, in the process of producing 4,4'-diaminodiphenyl ether, 4,4'-dinitrodiphenyl ether is usually put into the solvent dimethylacetamide to dissolve and then directly transferred from the chemical feeding kettle to the hydrogenation kettle. Under the promotion of 5% palladium-carbon catalyst, a hydrogenation reduction reaction is carried out. After the reaction is completed, the material enters the filter, and the ceramic filter element in the filter separates the material from the 5% palladium-carbon catalyst. The material goes to the centrifuge to obtain crude 4,4'-diaminodiphenyl ether. Since impurities contained in 4,4'-dinitrodiphenyl ether cannot be removed in this process, the utilization rate of the 5% palladium-carbon catalyst is reduced, and at the same time, the number of uses of the filter element is reduced. Moreover, the impurities will also affect the subsequent centrifugal separation. The pipeline is prone to blockage during transfer, and the centrifuge filter cloth needs to be replaced every seven days, which affects the production efficiency and causes a significant increase in production costs. Therefore, it is necessary to develop an impurity removal system for the production of 4,4'-diaminodiphenyl ether that can effectively remove impurities, improve the utilization rate of the catalyst and the service life of the filter element, improve the production efficiency and reduce the production cost at the same time. Summary of the Utility Model

[0003] In view of the above technical problems, the utility model provides an impurity removal system for the production of 4,4'-diaminodiphenyl ether that can effectively remove impurities, improve the utilization rate of the catalyst and the service life of the filter element, improve the production efficiency and reduce the production cost at the same time, so as to solve the problem that the existing 4,4'-diaminodiphenyl ether production system cannot effectively remove impurities, resulting in reduced production efficiency and increased costs.

[0004] To solve the above technical problems, an impurity removal system for the production of 4,4'-diaminodiphenyl ether described in the utility model includes a chemical feeding kettle and a hydrogenation kettle. The discharge end of the chemical feeding kettle is connected to the feeding end of a filter press through a pipeline, the discharge end of the filter press is connected to the feeding end of the hydrogenation kettle through a pipeline, the discharge end of the hydrogenation kettle is connected to the feeding end of a filter through a pipeline, the discharge end of the filter is connected to the feeding end of a centrifuge through a pipeline, and the recovery end of the filter is connected to the feeding port of the hydrogenation kettle through a pipeline.

[0005] Further, the discharge end of the filter press is connected to the feed end of the intermediate kettle through a pipeline, and the discharge end of the intermediate kettle is connected to the feed end of the hydrogenation kettle through a pipeline.

[0006] Further, jacketed vessels are provided on the outer sides of the chemical charging kettle, the intermediate kettle, and the hydrogenation kettle, and a circulating inlet pipe and a circulating outlet pipe are respectively connected to the upper and lower parts of the jacketed vessel.

[0007] Further, control valves and material pumps are connected to the pipelines between the chemical charging kettle and the filter press, the filter press and the intermediate kettle, the intermediate kettle and the hydrogenation kettle, the hydrogenation kettle and the filter, and the filter and the centrifuge.

[0008] The utility model has the following advantages compared with the prior art:

[0009] By arranging the filter press, most of the impurities can be effectively removed during the production process. The removal of impurities enables the filter to effectively separate the 5% palladium-carbon catalyst, improving the utilization rate of the 5% palladium-carbon catalyst and increasing the number of uses of the filter element; the removal of impurities also avoids the problem of easy blockage of pipelines during the production process, extends the time for replacing the filter cloth of the centrifuge, improves the production efficiency of 4,4'-diaminodiphenyl ether, and effectively reduces the production cost; by arranging the intermediate kettle, the temporary storage of intermediate materials can be realized, which is convenient for controlling the reaction process and facilitating continuous reaction, further improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural diagram of the utility model.

[0011] In the figure: 1. Chemical charging kettle, 2. Filter press, 3. Intermediate kettle, 4. Hydrogenation kettle, 5. Filter, 6. Centrifuge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] The following further describes the utility model with reference to the accompanying drawings.

[0013] As Figure 1 shown, an impurity removal system for the production of 4,4'-diaminodiphenyl ether includes a chemical charging kettle 1 and a hydrogenation kettle 4. It should be noted that in this embodiment, a stirring device is provided in the chemical charging kettle 1, including a stirring motor fixedly connected to the top of the chemical charging kettle 1 and a stirring blade rotatably connected to the inside of the chemical charging kettle 1. The upper end of the stirring blade penetrates through the chemical charging kettle 1 and is fixedly connected to the output end of the stirring motor; the discharge end of the chemical charging kettle 1 is connected to the feed end of the filter press 2 through a pipeline, the discharge end of the filter press 2 is connected to the feed end of the hydrogenation kettle 4 through a pipeline, the discharge end of the hydrogenation kettle 4 is connected to the feed end of the filter 5 through a pipeline, the discharge end of the filter 5 is connected to the feed end of the centrifuge 6 through a pipeline, and the recovery end of the filter 5 is connected to the feed port of the hydrogenation kettle 4 through a pipeline.

[0014] It should be noted that in this embodiment, in order to ensure the effect and efficiency of impurity removal, an activated carbon temporary storage tank is further included. Wood-based activated carbon is stored in the activated carbon temporary storage tank. The discharge end of the activated carbon temporary storage tank is communicated with the feeding port of the chemical material kettle 1. When producing 4,4'-diaminodiphenyl ether, adding wood-based activated carbon can effectively adsorb impurities, and when filtering with the filter press 2, the removal efficiency and effect of impurities in the material can be improved.

[0015] In order to ensure the continuous operation of the production system, an intermediate kettle 3 is provided for temporarily storing intermediate materials to improve production efficiency. The discharge end of the filter press 2 is connected to the feed end of the intermediate kettle 3 through a pipeline, and the discharge end of the intermediate kettle 3 is connected to the feed end of the hydrogenation kettle 4 through a pipeline.

[0016] In order to control the temperature in the kettle body during the production process, jackets are provided on the outer sides of the chemical material kettle 1, the intermediate kettle 3, and the hydrogenation kettle 4. The upper and lower parts of the jacket are respectively connected with a circulation inlet pipe and a circulation outlet pipe. It should be noted that in this embodiment, it is necessary to heat the kettle body, so steam is introduced into the jacket to raise the temperature of the kettle body. The circulation inlet pipe is connected to the steam source through a pipeline. In addition, circulating hot water can also be introduced into it to achieve the temperature rise of the kettle body.

[0017] In order to effectively control the production process, ensure the continuity of production, and at the same time facilitate the material transportation between various components, control valves and material pumps are connected to the pipelines between the chemical material kettle 1 and the filter press 2, between the filter press 2 and the intermediate kettle 3, between the intermediate kettle 3 and the hydrogenation kettle 4, between the hydrogenation kettle 4 and the filter 5, and between the filter 5 and the centrifuge 6.

[0018] It should be noted that in this embodiment, the chemical material kettle 1, the intermediate kettle 3, and the hydrogenation kettle 4 are all common reaction kettles in the chemical industry, and the filter press 2, the filter 5, and the centrifuge 6 are all common equipment in the chemical industry, and they are all existing devices. Therefore, the specific structures thereof will not be described in detail herein. In this embodiment, the filter press 2 adopts an automatic box-type filter press.

[0019] The working process of this embodiment is as follows:

[0020] When producing 4,4'-diaminodiphenyl ether, dimethylacetamide as a solvent and 4,4'-dinitrodiphenyl ether are added into the charging kettle 1 through its feed inlet. At the same time, wood activated carbon is added. Steam is introduced into the jacket of the charging kettle 1 to raise the temperature, and the materials are stirred simultaneously. The control valve and the material pump are started to make the materials enter the filter press 2. After the filter press 2 filters out the impurities therein, dimethylacetamide and 4,4'-dinitrodiphenyl ether enter the intermediate kettle 3. Then, dimethylacetamide and 4,4'-dinitrodiphenyl ether are introduced into the hydrogenation kettle 4 for hydrogenation reduction reaction. At the same time, 5% palladium-carbon catalyst is added into the hydrogenation kettle 4 to promote the reaction. The reacted materials are introduced into the filter 5. The ceramic filter element in the filter 5 separates the crude 4,4'-diaminodiphenyl ether generated by the reaction from the 5% palladium-carbon catalyst. The separated crude 4,4'-diaminodiphenyl ether enters the centrifuge 6 for solid-liquid separation to obtain the crude product 4,4'-diaminodiphenyl ether. The separated 5% palladium-carbon catalyst is reused in the hydrogenation kettle 4 for hydrogenation reduction reaction.

Claims

1. An impurity removal system for the production of 4,4'-diaminodiphenyl ether, comprising a chemical charging kettle (1) and a hydrogenation kettle (4), characterized in that: The discharge end of the chemical material kettle (1) is connected to the feed end of the filter press (2) through a pipeline. The discharge end of the filter press (2) is connected to the feed end of the hydrogenation kettle (4) through a pipeline. The discharge end of the hydrogenation kettle (4) is connected to the feed end of the filter (5) through a pipeline. The discharge end of the filter (5) is connected to the feed end of the centrifuge (6) through a pipeline. The recovery end of the filter (5) is connected to the feed inlet of the hydrogenation kettle (4) through a pipeline.

2. The impurity removal system for the production of 4,4'-diaminodiphenyl ether according to claim 1, characterized in that: The discharge end of the filter press (2) is connected to the feed end of the intermediate kettle (3) through a pipeline. The discharge end of the intermediate kettle (3) is connected to the feed end of the hydrogenation kettle (4) through a pipeline.

3. The impurity removal system for the production of 4,4'-diaminodiphenyl ether according to claim 2, characterized in that: Jackets are provided on the outer sides of the chemical material kettle (1), the intermediate kettle (3), and the hydrogenation kettle (4). A circulation inlet pipe and a circulation outlet pipe are respectively connected to the upper and lower parts of the jacket.

4. The impurity removal system for the production of 4,4'-diaminodiphenyl ether according to claim 3, characterized in that: Control valves and material pumps are connected to the pipelines between the chemical material kettle (1) and the filter press (2), the filter press (2) and the intermediate kettle (3), the intermediate kettle (3) and the hydrogenation kettle (4), the hydrogenation kettle (4) and the filter (5), and the filter (5) and the centrifuge (6).

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