Raw material preparation system for preparing cyclic carbonate by urea method

Abstract

The utility model relates to the technical field of preparation of cyclic carbonate by a urea method, and aims to solve the problems that an existing raw material preparation system for preparing the cyclic carbonate by the urea method is relatively low in automation degree or wastes time and labor in continuous urea conveying and is easy to cause pipeline blockage. The utility model provides a raw material preparation system for preparing cyclic carbonate by a urea method, which comprises a plurality of urea bin pumps and a plurality of gas storage tanks, the gas storage tanks are communicated with the urea bin pumps through first gas inlet pipes, and the first gas inlet pipes are connected with second gas inlet pipes; the second air inlet pipe is provided with an air supplementing fluidization valve group; the urea bin pump is communicated with a plurality of buffer metering tanks through a first conveying pipe group; the buffer metering tank is communicated with the reaction kettle through a second conveying pipe; the raw material preparation system for preparing the cyclic carbonate by the urea method provided by the utility model is time-saving and labor-saving, is not easy to cause pipeline blockage, and can store materials quantitatively so as to facilitate uniform feeding.

Description

Technical Field

[0001] This utility model relates to the field of urea method for preparing cyclic carbonates, and more specifically, to a raw material preparation system for urea method for preparing cyclic carbonates. Background Technology

[0002] Cyclic carbonates are important environmentally friendly chemical products that can be used as high-performance organic solvents in petrochemical, cosmetic, gas separation and electrochemical fields.

[0003] In existing technologies, ethylene oxide (propane) is typically used to prepare cyclic carbonates. When using the urea method, the reaction raw materials include urea, propylene glycol / ethylene glycol, and a solid catalyst. To ensure the continuous progress of the reaction, i.e., the requirement of continuous production, the raw materials need to be continuously prepared. In existing technologies, the raw material components are continuously fed into a raw material mixer, mixed, and then continuously output for continuous production. For example, the patent with publication number CN104059047A discloses a continuous reaction process for synthesizing cyclic carbonates from urea. Urea, polyol, and catalyst are continuously fed to the upper part of a raw material mixer equipped with an external forced circulation pump in the required proportions. After the urea, polyol, and catalyst form a mixture in the raw material mixer, it is discharged from the bottom outlet of the raw material mixer.

[0004] Urea raw materials are usually solid granules. Therefore, in the current technology, urea granules are usually fed directly into the mixer manually or transported to the mixer by pneumatic conveying. However, manual methods are costly, while pneumatic conveying is prone to clogging.

[0005] Based on the above description, there is an urgent need for a time-saving, labor-saving, and less prone-to-clogging raw material preparation system for the urea method to prepare cyclic carbonates. Utility Model Content

[0006] The purpose of this invention is to provide a raw material preparation system for the preparation of cyclic carbonates using the urea method, which aims to solve the technical problems of existing raw material preparation systems for the preparation of cyclic carbonates using the urea method, such as the time-consuming and labor-intensive continuous transport of urea and the tendency to cause pipeline blockage.

[0007] The embodiments of this utility model are achieved through the following technical solutions:

[0008] A raw material preparation system for the preparation of cyclic carbonates using the urea process includes multiple urea storage pumps and multiple gas storage tanks. The gas storage tanks are connected to the urea storage pumps via a first gas inlet pipe and are also connected to a second gas inlet pipe. The second gas inlet pipe is equipped with a supplementary gas flow transformation valve assembly. The urea storage pumps are connected to multiple buffer metering tanks via a first feed pipe assembly. The buffer metering tanks are connected to a reaction vessel via a second feed pipe.

[0009] Preferably, the first intake pipe is equipped with an intake valve assembly.

[0010] Preferably, the first conveying pipe group includes a main conveying pipe and multiple feed branch pipes connected to the main conveying pipe; the multiple feed branch pipes are respectively connected to the buffer metering tank.

[0011] Preferably, all of the urea tank pumps are connected to a dust extraction fan.

[0012] Preferably, the buffer metering tank is connected to an exhaust system.

[0013] Preferably, the exhaust system includes a filter tank and a vacuum pump; the top of the filter tank is connected to the first feed pipe assembly; and the bottom of the filter tank is connected to the vacuum pump.

[0014] Preferably, the filter canister is connected to a drying component.

[0015] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0016] The present invention provides a raw material preparation system for the preparation of cyclic carbonates using the urea method. The urea storage pump is located in the urea storage warehouse. Urea granules are fed into the urea storage pump using tools such as forklifts, and then sent to the reaction vessel through the urea storage pump and various conveying pipes.

[0017] Specifically, the first air inlet pipe can connect to the air storage tank to provide air for multiple urea tank pumps, and the second air inlet pipe can supplement the air for a single urea tank pump, ensuring that the urea has sufficient pressure during the pumping process, so that the urea can be quickly delivered to the reactor and avoid material accumulation and blockage.

[0018] Furthermore, the buffer metering tank can quantitatively store urea to facilitate uniform feeding into the reactor, and can also serve as a transfer station, thereby shortening the pumping distance, reducing the difficulty of pumping, and avoiding pipeline blockage. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the system of this utility model;

[0021] Figure 2 This is a schematic diagram of the filter tank in this utility model.

[0022] Icons: 1-Urea tank pump, 2-Air storage tank, 3-First air inlet pipe, 4-Second air inlet pipe, 5-Make-up gasification valve assembly, 6-First conveying pipe assembly, 61-Main conveying pipe, 62-Inlet branch pipe, 7-Buffer metering tank, 8-Reaction vessel, 9-Air inlet valve assembly, 10-Dust extraction fan, 11-Exhaust system, 111-Filter tank, 112-Air extraction pump, 12-Second conveying pipe, 13-Screw feeder. Detailed Implementation

[0023] Example 1

[0024] Please see Figures 1 to 2 The present invention provides the following technical solution: a raw material preparation system for the preparation of cyclic carbonates by urea method, which is suitable for the transportation of urea solid particle raw materials.

[0025] Specifically, such as Figure 1 As shown, a raw material preparation system for preparing cyclic carbonates using the urea method includes multiple urea storage pumps 1 and multiple gas storage tanks 2. The gas storage tanks 2 are connected to the urea storage pumps 1 via a first gas inlet pipe 3. The first gas inlet pipe 3 is connected in parallel to a second gas inlet pipe 4. The second gas inlet pipe 4 is equipped with a supplementary gas flow transformation valve group 5. The urea storage pumps 1 are connected to multiple buffer metering tanks 7 via a first feed pipe group 6. The buffer metering tanks 7 are connected to a reaction vessel 8 via a second feed pipe 12.

[0026] In this embodiment, the urea storage pump 1 is located in the urea storage warehouse. Urea granules are fed into the urea storage pump 1 (i.e., the gasification jet pump) using tools such as forklifts, and then delivered to the reactor 8 through the urea storage pump 1 and various delivery pipes. Specifically, the first air inlet pipe 3 connects to the air storage tank 2 to provide an air source for multiple urea storage pumps 1, and the second air inlet pipe 4 can supplement the air source for a single urea storage pump 1, ensuring sufficient pressure for urea during pumping, so that urea can be quickly delivered to the reactor 8 and avoiding material accumulation and blockage. Furthermore, the buffer metering tank 7 can quantitatively store urea to facilitate uniform delivery to the reactor 8, and can also serve as a transfer tank, thereby shortening the pumping distance, reducing the difficulty of pumping, and avoiding pipeline blockage.

[0027] In this embodiment, the supplementary gasification valve group 5 includes a manual valve and an automatic switching valve, and its main function is to regulate the system pressure and prevent bridging at the bottom of the tank.

[0028] Specifically, such as Figure 1 As shown, the first air inlet pipe 3 is equipped with an air inlet valve group 9, which mainly includes a manual valve, a pressure regulating valve, and an automatic switching valve. The manual valve and the automatic switching valve are mainly used for replenishing the air inlet, while the pressure regulating valve is mainly used to adjust the different pressures required for different materials.

[0029] Specifically, such as Figure 1 As shown, the first conveying pipe group 6 includes a main conveying pipe 61 and multiple feed branch pipes 62 connected to the main conveying pipe 61; the multiple feed branch pipes 62 are respectively connected to the buffer metering tank 7.

[0030] In this embodiment, each urea tank pump 1 is provided with a main conveying pipe 61, and each main conveying pipe 61 is provided with multiple feed branch pipes 62. Each feed branch pipe 62 is connected to each buffer metering tank 7, so as to facilitate the simultaneous and uniform feeding of each buffer metering tank 7.

[0031] Specifically, such as Figure 1 As shown, each of the multiple urea tank pumps 1 is connected to a dust extraction fan 10 for dust extraction.

[0032] Specifically, such as Figure 1 and Figure 2 As shown, the buffer metering tank 7 is connected to an exhaust system 11. The exhaust system 11 includes a filter tank 111 and a vacuum pump 112; the top of the filter tank 111 is connected to the first feed pipe assembly 6; the bottom of the filter tank 111 is connected to the vacuum pump 112. The filter tank 111 is connected to a drying assembly.

[0033] In this embodiment, the filter tank 111 includes a tank body, a pair of baffles, a multi-stage filter plate or filter filling layer, an air inlet pipe, multiple heat exchange tubes, and an exhaust pipe. The drying assembly 12 includes a hot air heater, a blower, and an exhaust fan. The blower delivers hot air from the hot air heater into the top of the tank body through the air inlet pipe, passes through the heat exchange tubes inside the tank body, and is finally extracted by the exhaust fan. The gas extracted from the buffer metering tank 7 is delivered from the top side of the tank body, passes through the shell side, is filtered by the filter plate or filter filling layer, and is then extracted by the air pump. By using the drying assembly 12, clogging of the urea during the filtration process can be avoided.

[0034] In this embodiment, a screw feeder 13 is provided at the bottom of the buffer metering tank 7, which can directly feed the urea inside the buffer metering tank 7 into the reaction vessel 8.

[0035] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A raw material preparation system for the preparation of cyclic carbonates using the urea method, comprising multiple urea tank pumps (1) and multiple gas storage tanks (2), characterized in that: The gas storage tank (2) is connected to the urea tank pump (1) through the first air inlet pipe (3); the first air inlet pipe (3) is connected to the second air inlet pipe (4); the second air inlet pipe (4) is equipped with a supplementary gasification valve group (5); the urea tank pump (1) is connected to multiple buffer metering tanks (7) through the first material conveying pipe group (6); the buffer metering tanks (7) are connected to the reaction vessel (8) through the second material conveying pipe (12).

2. The raw material preparation system for the urea method for preparing cyclic carbonates according to claim 1, characterized in that: The first intake pipe (3) is equipped with an intake valve assembly (9).

3. The raw material preparation system for the urea method for preparing cyclic carbonates according to claim 1, characterized in that: The first conveying pipe group (6) includes a main conveying pipe (61) and multiple feed branch pipes (62) connected to the main conveying pipe (61); the multiple feed branch pipes (62) are respectively connected to the buffer metering tank (7).

4. The raw material preparation system for the urea method for preparing cyclic carbonates according to claim 1, characterized in that: Each of the urea tank pumps (1) is connected to a dust extraction fan (10).

5. The raw material preparation system for the urea method for preparing cyclic carbonates according to any one of claims 1 to 4, characterized in that: The buffer metering tank (7) is connected to an exhaust system (11).

6. The raw material preparation system for the urea method of preparing cyclic carbonates according to claim 5, characterized in that: The exhaust system (11) includes a filter tank (111) and a vacuum pump (112); the top of the filter tank (111) is connected to the first feed pipe assembly (6); the bottom of the filter tank (111) is connected to the vacuum pump (112).

7. The raw material preparation system for the urea method for preparing cyclic carbonates according to claim 6, characterized in that: The filter tank (111) is connected to a drying component.

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