Device for recovering chloroacetic acid from heavy components of chloroacetic acid

Abstract

The utility model belongs to the technical field of production of chemical raw materials, and particularly relates to a device for recovering chloroacetic acid from heavy components of chloroacetic acid, which comprises a stripping tower, the bottom of the stripping tower is connected with a flash tank through a discharge pipe, the top of the flash tank is provided with a venturi ejector, and the venturi ejector is provided with a gas ejector pipe and a steam inlet pipe. The top of the stripping tower is sequentially connected with a cooler and a storage tank through an exhaust pipe, a bottom outlet of the storage tank is connected with the upper part of the stripping tower through a return pipe, the return pipe extends to the inner cavity of the stripping tower and is connected with a liquid distributor, and a feeding pipe is arranged on the side wall of the stripping tower. The device disclosed by the utility model can be used for recovering chloroacetic acid in the heavy components of chloroacetic acid, avoiding resource waste caused by treatment of the heavy components of chloroacetic acid, saving the use cost of materials and simultaneously reducing environmental pollution.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical raw material production, and particularly relates to a device for recovering chloroacetic acid from chloroacetic acid heavy components. Background Art

[0002] Chloroacetic acid, an important chemical raw material, is widely used in pharmaceuticals, pesticides, dyes, and synthetic resins. During the production of chloroacetic acid, a certain amount of heavy components is often produced. These heavy components are rich in unreacted chloroacetic acid and other impurities. Directly discarding these heavy components not only results in a significant waste of resources but also pollutes the environment. Therefore, recovering chloroacetic acid from these heavy components is particularly important. This not only improves raw material utilization and reduces production costs, but also alleviates pressure on resource extraction and promotes sustainable resource utilization, thus possessing significant economic and environmental significance.

[0003] Currently, the main treatment methods for the heavy components of chloroacetic acid include incineration and alkaline neutralization, but both methods have certain drawbacks for recovering chloroacetic acid from the heavy components. Incineration is highly efficient but consumes a large amount of energy. Alkaline neutralization can reduce the harmfulness of the heavy components of chloroacetic acid, but requires strict control of reaction conditions. With increasingly stringent environmental regulations and a growing social acceptance of the concept of a circular economy, recovering chloroacetic acid from the heavy components of chloroacetic acid through professional and technical means is currently a key recovery method. However, existing chloroacetic acid recovery equipment is mostly distillation and rectification equipment, which is prone to problems such as incomplete recovery and long recovery times. Utility Model Content

[0004] The purpose of the utility model is to provide a device for recovering chloroacetic acid from chloroacetic acid heavy components, which can recover chloroacetic acid in the chloroacetic acid heavy components, avoid the waste of resources caused by the treatment of the chloroacetic acid heavy components, save material usage costs, and reduce environmental pollution.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] The utility model discloses a device for recovering chloroacetic acid from chloroacetic acid heavy components, comprising a stripping tower, wherein the bottom of the stripping tower is connected to a flash tank via a discharge pipe, the top of the flash tank is provided with a venturi ejector, the venturi ejector is provided with an injection pipe and a steam inlet pipe, the injection pipe extends into the lower part of the inner cavity of the stripping tower and is connected to a gas distributor, the top of the stripping tower is sequentially connected to a cooler and a storage tank via an exhaust pipe, the bottom outlet of the storage tank is connected to the upper part of the stripping tower via a reflux pipe, the reflux pipe extends to the inner cavity of the stripping tower and is connected to a liquid distributor, and a feed pipe is provided on the side wall of the stripping tower.

[0007] in:

[0008] One end of the discharge pipe is connected to the bottom of the stripping tower, and the other end is connected to the lower part of the flash tank.

[0009] A discharge pipe is provided at the bottom of the flash tank.

[0010] The left and right ends of the Venturi ejector are respectively connected to the injection pipe and the steam inlet pipe.

[0011] The bottom of the venturi ejector is communicated with the flash tank.

[0012] The gas distributor is arranged at the lower center of the inner cavity of the stripping tower, and the nozzle of the gas distributor is arranged upward.

[0013] The bottom outlet of the storage tank is connected with a chloroacetic acid outlet pipe.

[0014] The liquid distributor is arranged at the upper center of the inner cavity of the stripping tower, and the nozzle of the liquid distributor is arranged downward.

[0015] The gas distributor and the liquid distributor are arranged opposite to each other.

[0016] A cooling water inlet pipe and a cooling water outlet pipe are respectively provided on both sides of the cooler.

[0017] The beneficial effects of the utility model are:

[0018] By providing a flash tank, the chloroacetic acid with a relatively low boiling point in the chloroacetic acid heavy component can be flash-evaporated; by providing a venturi ejector, the flashed chloroacetic acid gas can be sprayed into a stripping tower; by providing a stripping tower, the flashed chloroacetic acid gas can be stripped and recovered. At the same time, lipid substances in the chloroacetic acid heavy component in the stripping tower are hydrolyzed under the action of steam to produce more chloroacetic acid; by providing a cooler and a storage tank, the stripped chloroacetic acid gas can be condensed and recovered. The utility model can recover chloroacetic acid from the chloroacetic acid heavy component, saving material usage costs and reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] In the picture:

[0021] 1. Stripping tower; 2. Discharge pipe; 3. Flash tank; 4. Venturi ejector; 5. Jet pipe; 6. Steam inlet pipe; 7. Exhaust pipe; 8. Cooler; 9. Storage tank; 10. Chloroacetic acid outlet pipe; 11. Reflux pipe; 12. Discharge pipe; 13. Feed pipe; 14. Gas distributor; 15. Liquid distributor; 16. Cooling water inlet pipe; 17. Cooling water outlet pipe. DETAILED DESCRIPTION

[0022] The present invention will be described and illustrated in detail below with reference to the embodiments.

[0023] Example 1

[0024] like Figure 1 As shown, the device for recovering chloroacetic acid from chloroacetic acid heavy components described in the utility model includes a stripping tower 1, the bottom of the stripping tower 1 is connected to a flash tank 3 through a discharge pipe 2, the top of the flash tank 3 is provided with a venturi ejector 4, the venturi ejector 4 is provided with an injection pipe 5 and a steam inlet pipe 6, the injection pipe 5 extends into the lower part of the inner cavity of the stripping tower 1 and is connected to a gas distributor 14, the top of the stripping tower 1 is connected to a cooler 8 and a storage tank 9 in sequence through an exhaust pipe 7, the bottom outlet of the storage tank 9 is connected to the upper part of the stripping tower 1 through a reflux pipe 11, the reflux pipe 11 extends to the inner cavity of the stripping tower 1 and is connected to a liquid distributor 15, and a feed pipe 13 is provided on the side wall of the stripping tower 1.

[0025] By providing a flash tank 3, a venturi ejector 4, and a stripping tower 1, effective separation of chloroacetic acid can be achieved; the steam delivered through the steam inlet pipe 6 can carry the chloroacetic acid gas, and at the same time, the lipid substances in the chloroacetic acid heavy component in the stripping tower 1 will be hydrolyzed under the action of the steam to produce more chloroacetic acid; by providing a cooler 8 and a storage tank 9, the vaporized chloroacetic acid can be condensed and recovered.

[0026] One end of the discharge pipe 2 is connected to the bottom of the stripping tower 1, and the other end is connected to the lower part of the flash tank 3.

[0027] A discharge pipe 12 is provided at the bottom of the flash tank 3 .

[0028] The left and right ends of the Venturi ejector 4 are connected to the injection pipe 5 and the steam inlet pipe 6 respectively.

[0029] The bottom of the venturi ejector 4 is connected to the flash tank 3.

[0030] The gas distributor 14 is arranged at the lower center of the inner cavity of the stripping tower 1, and the nozzle of the gas distributor 14 is arranged upward.

[0031] After passing through the venturi ejector 4, the steam is ejected into the injection pipe 5 at high speed and transported to the stripping tower 1 through the gas distributor 14. At the same time, a pressure difference is formed between the venturi ejector 4 and the inside of the flash tank 3, thereby absorbing the chloroacetic acid gas flashed out of the flash tank 3 and pushing the chloroacetic acid gas into the stripping tower 1 along with the steam.

[0032] The bottom outlet of the storage tank 9 is connected to a chloroacetic acid outlet pipe 10.

[0033] The liquid distributor 15 is arranged at the upper center of the inner cavity of the stripping tower 1, and the nozzle of the liquid distributor 15 is arranged downward.

[0034] The gas distributor 14 and the liquid distributor 15 are arranged opposite to each other.

[0035] Steam and chloroacetic acid gas form a mixed gas inside the stripping tower 1. The mixed gas enters the cooler 8 through the exhaust pipe 7. After being cooled by the cooler 8, it is converted into a liquid material. The liquid material enters the liquid distributor 15 at the top of the stripping tower 1 through the storage tank 9 and the reflux pipe 11. The liquid material is in countercurrent contact with the mixed gas inside the stripping tower 1, forming a circulating reflux system, which can improve the purity of the recovered chloroacetic acid.

[0036] A cooling water inlet pipe 16 and a cooling water outlet pipe 17 are respectively provided on both sides of the cooler 8 .

[0037] Working process and principle:

[0038] Chloroacetic acid heavy components are added to the stripping tower 1 through the feed pipe 13. When the chloroacetic acid heavy components rise to a certain liquid level, the discharge pipe 2 is opened, and the chloroacetic acid heavy components enter the flash tank 3. The flash tank 3 flashes out the chloroacetic acid with a relatively low boiling point in the chloroacetic acid heavy components; steam is introduced into the venturi ejector 4 through the steam inlet pipe 6. After passing through the venturi ejector 4, the steam is ejected into the injection pipe 5 at a high speed and is dispersed and transported to the stripping tower 1 through the gas distributor 14. At the same time, a pressure difference is formed between the venturi ejector 4 and the flash tank 3, thereby absorbing the chloroacetic acid gas flashed out in the flash tank 3 and pushing the chloroacetic acid gas into the stripping tower 1 along with the steam; the lipid substances in the chloroacetic acid heavy components in the stripping tower 1 are also removed by the steam. Hydrolysis will occur under use to produce more chloroacetic acid. At the same time, steam and chloroacetic acid gas form a mixed gas in the stripping tower 1. The mixed gas is separated from the chloroacetic acid heavy component in the stripping tower 1. The mixed gas rising to the top of the stripping tower 1 enters the cooler 8 through the exhaust pipe 7 and is cooled and converted into a liquid material. The liquid material enters the liquid distributor 15 at the top of the stripping tower 1 through the storage tank 9 and the reflux pipe 11, and contacts with the mixed gas inside the stripping tower 1 in countercurrent, forming a circulating reflux system for multiple cycles to improve the purity of the recovered chloroacetic acid. After the circulation reflux is completed, the chloroacetic acid outlet pipe 10 is opened to recover the chloroacetic acid product extracted from the chloroacetic acid heavy component, and the discharge pipe 12 is opened to discharge the remaining heavy component to the subsequent process.

Claims

1. A device for recovering chloroacetic acid from chloroacetic acid heavy components, comprising a stripping tower (1), characterized in that: The bottom of the stripping tower (1) is connected to a flash tank (3) through a discharge pipe (2), a venturi ejector (4) is provided on the top of the flash tank (3), an injection pipe (5) and a steam inlet pipe (6) are provided on the venturi ejector (4), the injection pipe (5) extends into the lower part of the inner cavity of the stripping tower (1) and is connected to a gas distributor (14), the top of the stripping tower (1) is connected to a cooler (8) and a storage tank (9) in sequence through an exhaust pipe (7), the bottom outlet of the storage tank (9) is connected to the upper part of the stripping tower (1) through a reflux pipe (11), the reflux pipe (11) extends to the inner cavity of the stripping tower (1) and is connected to a liquid distributor (15), and a feed pipe (13) is provided on the side wall of the stripping tower (1).

2. The device for recovering chloroacetic acid from chloroacetic acid heavy components according to claim 1, wherein One end of the discharge pipe (2) is connected to the bottom of the stripping tower (1), and the other end is connected to the lower part of the flash tank (3).

3. The device for recovering chloroacetic acid from chloroacetic acid heavy components according to claim 1, wherein A discharge pipe (12) is provided at the bottom of the flash tank (3).

4. The device for recovering chloroacetic acid from chloroacetic acid heavy components according to claim 1, wherein The left and right ends of the Venturi ejector (4) are connected to an air injection pipe (5) and a steam inlet pipe (6) respectively.

5. The device for recovering chloroacetic acid from chloroacetic acid heavy components according to claim 4, wherein The bottom of the venturi ejector (4) is connected to the flash tank (3).

6. The device for recovering chloroacetic acid from chloroacetic acid heavy components according to claim 1, characterized in that: The gas distributor (14) is arranged at the lower center of the inner cavity of the stripping tower (1), and the nozzle of the gas distributor (14) is arranged upward.

7. The device for recovering chloroacetic acid from chloroacetic acid heavy components according to claim 1, wherein The bottom outlet of the storage tank (9) is connected to a chloroacetic acid outlet pipe (10).

8. The device for recovering chloroacetic acid from chloroacetic acid heavy components according to claim 6, wherein The liquid distributor (15) is arranged at the upper center of the inner cavity of the stripping tower (1), and the nozzle of the liquid distributor (15) is arranged downward.

9. The device for recovering chloroacetic acid from chloroacetic acid heavy components according to claim 8, characterized in that: The gas distributor (14) and the liquid distributor (15) are arranged opposite to each other.

10. The device for recovering chloroacetic acid from chloroacetic acid heavy components according to claim 1, characterized in that: A cooling water inlet pipe (16) and a cooling water outlet pipe (17) are respectively provided on both sides of the cooler (8).

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