Crude adipic acid dissolving device

Abstract

The utility model discloses a crude adipic acid dissolving device which comprises a dissolving tank and a crude adipic acid feed port, the crude adipic acid feed port is connected with a dissolved water inlet pipe used for flushing a feed pipe and providing a solvent, and the dissolved water inlet pipe is provided with heat exchange equipment used for heating pure water; and the heat exchange equipment uses waste heat of factory condensate water as a heat source. The waste heat of the steam condensate is utilized, so that the energy waste is reduced, the production cost is reduced, and the low-pressure steam is saved by about 2.5 t / h; the structure is simple, modification and maintenance are easy, and the modification cost is low; the temperature of the pure water is about 80-90 DEG C after the pure water is heated by the waste heat of the steam condensate, so that the dissolving requirement of the crude adipic acid is met; crude adipic acid feeding and flushing equipment, a pure water tank and heating equipment thereof are simplified, and the equipment maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to production equipment for refined adipic acid, in particular to a crude adipic acid dissolving device. Background Art

[0002] Refined adipic acid is usually prepared by recrystallization of crude adipic acid. During the production process, the crude adipic acid is separated by a centrifuge and then dissolved in 90°C pure water for further purification. In order to ensure the solubility of the crude adipic acid, a large amount of high-temperature pure water is required. Figure 1 As shown, the current production line is equipped with a pure water tank heater 16. This uses steam heating to raise the temperature of pure water, which is then injected into the dissolution tank 1 through the water inlet pipe 17 to ensure sufficient dissolution of the crude adipic acid. This steam heating consumes a lot of energy and increases production costs. Furthermore, a pure water storage tank 15 is added to the discharge pipe of the crude adipic acid centrifuge. The water temperature in pure water storage tank 15 is only 40°C, which cannot ensure sufficient dissolution of the adipic acid. Especially in winter, when the ambient temperature is low, the low temperature and small amount of pure water cannot completely prevent adipic acid crystallization in the pipe. To prevent clogging of the discharge pipe, a heating device must be added to water storage tank 15. The additional heating device and its energy consumption further increase production costs. Furthermore, the outdoor hot water process on the production line uses hot steam to generate a large amount of condensate at a temperature of approximately 80°C to 90°C. This is not properly utilized and is wasted, which invisibly increases production costs for the company. Utility Model Content

[0003] Purpose of the utility model: The purpose of the utility model is to recycle the waste heat of condensed water to reduce energy consumption and streamline equipment, and to provide a crude adipic acid dissolving device.

[0004] Technical solution: The crude adipic acid dissolving device described in the utility model includes a dissolving tank and a crude adipic acid feed port. The crude adipic acid feed port is connected to a dissolving water inlet pipe for flushing the feed pipe and providing solvent. The dissolving water inlet pipe is provided with a heat exchange device for heating the pure water in the pure water pipe; the heat exchange device utilizes the waste heat of the condensed water in the plant area as a heat source.

[0005] Furthermore, the crude adipic acid feed port is connected to the discharge pipe of the crude adipic acid centrifuge; the dissolving water inlet pipe is connected to the discharge pipe of the crude adipic acid centrifuge, and while flushing the adipic acid feed pipe, sufficient pure water is injected into the dissolving tank for secondary dissolution and purification of adipic acid.

[0006] Furthermore, the water temperature in the dissolved water inlet pipe is 80°C to 90°C, and the temperature of the condensed water collected on the production line of the factory after being heated into pure water by the heat exchange equipment can meet the dissolution requirements of adipic acid.

[0007] Furthermore, the pure water pipe is provided with a pure water flow meter and a flow control valve for controlling the amount of pure water flowing into the dissolution tank to ensure that the adipic acid is fully dissolved.

[0008] Furthermore, the heat exchange device is a plate-type heat exchange device, and the heat exchange area of ​​the heat exchange device is 20m 3 ~30m 3 The appropriate heat exchange area can fully utilize the waste heat of the condensed water to heat the pure water to the required temperature to meet the process requirements.

[0009] Beneficial effects: Compared with the existing technology, the utility model has the following advantages: 1. It utilizes the waste heat of steam condensate, reduces energy waste, lowers production costs, and saves about 2.5t / h of low-pressure steam; 2. It has a simple structure, is easy to modify and maintain, and has low modification costs; 3. After being heated by the waste heat of steam condensate, the temperature of pure water is about 80-90°C, which meets the dissolution requirements of crude adipic acid; 4. It streamlines the crude adipic acid feed flushing equipment and the pure water tank and its heating equipment, reducing equipment maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of a crude adipic acid dissolving device in the prior art;

[0011] Figure 2 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0012] The technical solution of the present utility model will be further described below with reference to the accompanying drawings.

[0013] like Figure 2 The crude adipic acid dissolving device shown in the figure includes a dissolving tank 1, a crude adipic acid feed port 2, and a dissolved water inlet pipe 11. The crude adipic acid feed port 15 is connected to the discharge pipe 13 of the crude adipic acid centrifuge 12, and the dissolved water inlet pipe 11 is connected to the discharge pipe 13 of the crude adipic acid centrifuge 12; a heat exchange device 5 for heating pure water is provided on the dissolved water inlet pipe 11; the heat exchange device 5 adopts a plate-type heat exchange device with a heat exchange area of ​​20m 3 ~30m 3 , using the waste heat of the condensed water in the plant as a heat source; the dissolved water inlet pipe 11 is provided with a flow meter 7 and a flow control valve 8.

[0014] During use, condensed water from the outdoor hot water process section of the plant's production line is collected for future use. The condensed water inlet valve 3 and outlet valve 4, as well as the pure water inlet valve 6 and outlet valve 9 on heat exchanger 5, are opened. The condensed water, carrying residual heat, flows through the condensed water inlet pipe and into heat exchanger 5, exchanging heat with the pure water flowing through heat exchanger 5, heating the pure water to 80°C to 90°C. The heated pure water is then heated through the dissolved water inlet pipe 11 and into the discharge pipe 13 of the crude adipic acid centrifuge 12. This flushes discharge pipe 13, preventing adipic acid crystals from clogging the pipe and providing aqueous solvent for dissolving the crude adipic acid.

Claims

1. A crude adipic acid dissolving device, comprising a dissolving tank (1) and a crude adipic acid feed port (2), characterized in that: The crude adipic acid feed port (2) is connected to a dissolving water inlet pipe (11) for flushing the feed pipe and providing solvent, and the dissolving water inlet pipe (11) is provided with a heat exchange device (5) for heating the pure water in the pure water pipe (14); the heat exchange device (5) utilizes the waste heat of the condensed water in the plant as a heat source.

2. The crude adipic acid dissolving device according to claim 1, characterized in that: The crude adipic acid feed port (2) is connected to the discharge pipe (13) of the crude adipic acid centrifuge (12); and the dissolved water inlet pipe (11) is connected to the discharge pipe (13) of the crude adipic acid centrifuge (12).

3. The crude adipic acid dissolving device according to claim 1, characterized in that: The water temperature in the dissolved water inlet pipe (11) is 80°C to 90°C.

4. The crude adipic acid dissolving device according to claim 1, characterized in that: The pure water pipe (14) is provided with a pure water flow meter (7).

5. The crude adipic acid dissolving device according to claim 1, characterized in that: The pure water pipe (14) is provided with a flow control valve (8).

6. The crude adipic acid dissolving device according to claim 1, characterized in that: The heat exchange equipment (5) is a plate-type heat exchange device.

7. The crude adipic acid dissolving device according to claim 6, characterized in that: The heat exchange area of ​​the heat exchange device (5) is 20m 3 ~30m 3 .

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